1 /* 2 Copyright 2008-2025 3 Matthias Ehmann, 4 Michael Gerhaeuser, 5 Carsten Miller, 6 Bianca Valentin, 7 Alfred Wassermann, 8 Peter Wilfahrt 9 10 This file is part of JSXGraph. 11 12 JSXGraph is free software dual licensed under the GNU LGPL or MIT License. 13 14 You can redistribute it and/or modify it under the terms of the 15 16 * GNU Lesser General Public License as published by 17 the Free Software Foundation, either version 3 of the License, or 18 (at your option) any later version 19 OR 20 * MIT License: https://github.com/jsxgraph/jsxgraph/blob/master/LICENSE.MIT 21 22 JSXGraph is distributed in the hope that it will be useful, 23 but WITHOUT ANY WARRANTY; without even the implied warranty of 24 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 25 GNU Lesser General Public License for more details. 26 27 You should have received a copy of the GNU Lesser General Public License and 28 the MIT License along with JSXGraph. If not, see <https://www.gnu.org/licenses/> 29 and <https://opensource.org/licenses/MIT/>. 30 */ 31 32 /*global JXG: true, define: true, AMprocessNode: true, MathJax: true, document: true, window: true */ 33 34 /* 35 nomen: Allow underscores to indicate private class members. Might be replaced by local variables. 36 plusplus: Only allowed in for-loops 37 newcap: AsciiMathMl exposes non-constructor functions beginning with upper case letters 38 */ 39 /*jslint nomen: true, plusplus: true, newcap: true, unparam: true*/ 40 /*eslint no-unused-vars: "off"*/ 41 42 /** 43 * @fileoverview JSXGraph can use various technologies to render the contents of a construction, e.g. 44 * SVG, VML, and HTML5 Canvas. To accomplish this, The rendering and the logic and control mechanisms 45 * are completely separated from each other. Every rendering technology has it's own class, called 46 * Renderer, e.g. SVGRenderer for SVG, the same for VML and Canvas. The common base for all available 47 * renderers is the class AbstractRenderer defined in this file. 48 */ 49 50 import JXG from "../jxg.js"; 51 import Options from "../options.js"; 52 import Coords from "../base/coords.js"; 53 import Const from "../base/constants.js"; 54 import Mat from "../math/math.js"; 55 import Geometry from "../math/geometry.js"; 56 import Type from "../utils/type.js"; 57 import Env from "../utils/env.js"; 58 59 /** 60 * <p>This class defines the interface to the graphics part of JSXGraph. This class is an abstract class, it 61 * actually does not render anything. This is up to the {@link JXG.SVGRenderer}, {@link JXG.VMLRenderer}, 62 * and {@link JXG.CanvasRenderer} classes. We strongly discourage you from using the methods in these classes 63 * directly. Only the methods which are defined in this class and are not marked as private are guaranteed 64 * to exist in any renderer instance you can access via {@link JXG.Board#renderer}. But not all methods may 65 * work as expected.</p> 66 * <p>The methods of this renderer can be divided into different categories: 67 * <dl> 68 * <dt>Draw basic elements</dt> 69 * <dd>In this category we find methods to draw basic elements like {@link JXG.Point}, {@link JXG.Line}, 70 * and {@link JXG.Curve} as well as assisting methods tightly bound to these basic painters. You do not 71 * need to implement these methods in a descendant renderer but instead implement the primitive drawing 72 * methods described below. This approach is encouraged when you're using a XML based rendering engine 73 * like VML and SVG. If you want to use a bitmap based rendering technique you are supposed to override 74 * these methods instead of the primitive drawing methods.</dd> 75 * <dt>Draw primitives</dt> 76 * <dd>This category summarizes methods to handle primitive nodes. As creation and management of these nodes 77 * is different among different the rendering techniques most of these methods are purely virtual and need 78 * proper implementation if you choose to not overwrite the basic element drawing methods.</dd> 79 * <dt>Attribute manipulation</dt> 80 * <dd>In XML based renders you have to manipulate XML nodes and their attributes to change the graphics. 81 * For that purpose attribute manipulation methods are defined to set the color, opacity, and other things. 82 * Please note that some of these methods are required in bitmap based renderers, too, because some elements 83 * like {@link JXG.Text} can be HTML nodes floating over the construction.</dd> 84 * <dt>Renderer control</dt> 85 * <dd>Methods to clear the drawing board or to stop and to resume the rendering engine.</dd> 86 * </dl></p> 87 * @class JXG.AbstractRenderer 88 * @constructor 89 * @see JXG.SVGRenderer 90 * @see JXG.VMLRenderer 91 * @see JXG.CanvasRenderer 92 */ 93 JXG.AbstractRenderer = function () { 94 // WHY THIS IS A CLASS INSTEAD OF A SINGLETON OBJECT: 95 // 96 // The renderers need to keep track of some stuff which is not always the same on different boards, 97 // like enhancedRendering, reference to the container object, and resolution in VML. Sure, those 98 // things could be stored in board. But they are rendering related and JXG.Board is already very 99 // very big. 100 // 101 // And we can't save the rendering related data in {SVG,VML,Canvas}Renderer and make only the 102 // JXG.AbstractRenderer a singleton because of that: 103 // 104 // Given an object o with property a set to true 105 // var o = {a: true}; 106 // and a class c doing nothing 107 // c = function() {}; 108 // Set c's prototype to o 109 // c.prototype = o; 110 // and create an instance of c we get i.a to be true 111 // i = new c(); 112 // i.a; 113 // > true 114 // But we can overwrite this property via 115 // c.prototype.a = false; 116 // i.a; 117 // > false 118 119 /** 120 * The vertical offset for {@link Text} elements. Every {@link Text} element will 121 * be placed this amount of pixels below the user given coordinates. 122 * @type Number 123 * @default 0 124 */ 125 this.vOffsetText = 0; 126 127 /** 128 * If this property is set to <tt>true</tt> the visual properties of the elements are updated 129 * on every update. Visual properties means: All the stuff stored in the 130 * {@link JXG.GeometryElement#visProp} property won't be set if enhancedRendering is <tt>false</tt> 131 * @type Boolean 132 * @default true 133 */ 134 this.enhancedRendering = true; 135 136 /** 137 * The HTML element that stores the JSXGraph board in it. 138 * @type Node 139 */ 140 this.container = null; 141 142 /** 143 * This is used to easily determine which renderer we are using 144 * @example if (board.renderer.type === 'vml') { 145 * // do something 146 * } 147 * @type String 148 */ 149 this.type = ""; 150 151 /** 152 * True if the browsers' SVG engine supports foreignObject. 153 * Not supported browsers are IE 9 - 11. 154 * It is tested in svg renderer. 155 * 156 * @type Boolean 157 * @private 158 */ 159 this.supportsForeignObject = false; 160 161 /** 162 * Defines dash patterns. Sizes are in pixel. 163 * Defined styles are: 164 * <ol> 165 * <li> 2 dash, 2 space</li> 166 * <li> 5 dash, 5 space</li> 167 * <li> 10 dash, 10 space</li> 168 * <li> 20 dash, 20 space</li> 169 * <li> 20 dash, 10 space, 10 dash, 10 space</li> 170 * <li> 20 dash, 5 space, 10 dash, 5 space</li> 171 * <li> 0 dash, 5 space (dotted line)</li> 172 * </ol> 173 * This means, the numbering is <b>1-based</b>. 174 * Solid lines are set with dash:0. 175 * If the object's attribute "dashScale:true" the dash pattern is multiplied by 176 * strokeWidth / 2. 177 * 178 * @type Array 179 * @default [[2, 2], [5, 5], [10, 10], [20, 20], [20, 10, 10, 10], [20, 5, 10, 5], [0, 5]] 180 * @see JXG.GeometryElement#dash 181 * @see JXG.GeometryElement#dashScale 182 */ 183 this.dashArray = [ 184 [2, 2], 185 [5, 5], 186 [10, 10], 187 [20, 20], 188 [20, 10, 10, 10], 189 [20, 5, 10, 5], 190 [0, 5] 191 ]; 192 }; 193 194 JXG.extend( 195 JXG.AbstractRenderer.prototype, 196 /** @lends JXG.AbstractRenderer.prototype */ { 197 198 /* ********* Private methods *********** */ 199 200 /** 201 * Update visual properties, but only if {@link JXG.AbstractRenderer#enhancedRendering} or <tt>enhanced</tt> is set to true. 202 * @param {JXG.GeometryElement} el The element to update 203 * @param {Object} [not={}] Select properties you don't want to be updated: <tt>{fill: true, dash: true}</tt> updates 204 * everything except for fill and dash. Possible values are <tt>stroke, fill, dash, shadow, gradient</tt>. 205 * @param {Boolean} [enhanced=false] If true, {@link JXG.AbstractRenderer#enhancedRendering} is assumed to be true. 206 * @private 207 */ 208 _updateVisual: function (el, not, enhanced) { 209 if (enhanced || this.enhancedRendering) { 210 not = not || {}; 211 212 this.setObjectTransition(el); 213 if (!el.evalVisProp('draft')) { 214 if (!not.stroke) { 215 if (el.highlighted) { 216 this.setObjectStrokeColor( 217 el, 218 el.evalVisProp('highlightstrokecolor'), 219 el.evalVisProp('highlightstrokeopacity') 220 ); 221 this.setObjectStrokeWidth(el, el.evalVisProp('highlightstrokewidth')); 222 } else { 223 this.setObjectStrokeColor( 224 el, 225 el.evalVisProp('strokecolor'), 226 el.evalVisProp('strokeopacity') 227 ); 228 this.setObjectStrokeWidth(el, el.evalVisProp('strokewidth')); 229 } 230 } 231 232 if (!not.fill) { 233 if (el.highlighted) { 234 this.setObjectFillColor( 235 el, 236 el.evalVisProp('highlightfillcolor'), 237 el.evalVisProp('highlightfillopacity') 238 ); 239 } else { 240 this.setObjectFillColor( 241 el, 242 el.evalVisProp('fillcolor'), 243 el.evalVisProp('fillopacity') 244 ); 245 } 246 } 247 248 if (!not.dash) { 249 this.setDashStyle(el, el.visProp); 250 } 251 252 if (!not.shadow) { 253 this.setShadow(el); 254 } 255 256 // if (!not.gradient) { 257 // // this.setGradient(el); 258 // this.setShadow(el); 259 // } 260 261 if (!not.tabindex) { 262 this.setTabindex(el); 263 } 264 } else { 265 this.setDraft(el); 266 } 267 268 if (el.highlighted) { 269 this.setCssClass(el, el.evalVisProp('highlightcssclass')); 270 } else { 271 this.setCssClass(el, el.evalVisProp('cssclass')); 272 } 273 274 if (el.evalVisProp('aria.enabled')) { 275 this.setARIA(el); 276 } 277 } 278 }, 279 280 /** 281 * Get information if element is highlighted. 282 * @param {JXG.GeometryElement} el The element which is tested for being highlighted. 283 * @returns {String} 'highlight' if highlighted, otherwise the ampty string '' is returned. 284 * @private 285 */ 286 _getHighlighted: function (el) { 287 var isTrace = false, 288 hl; 289 290 if (!Type.exists(el.board) || !Type.exists(el.board.highlightedObjects)) { 291 // This case handles trace elements. 292 // To make them work, we simply neglect highlighting. 293 isTrace = true; 294 } 295 296 if (!isTrace && Type.exists(el.board.highlightedObjects[el.id])) { 297 hl = "highlight"; 298 } else { 299 hl = ""; 300 } 301 return hl; 302 }, 303 304 /* ********* Point related stuff *********** */ 305 306 /** 307 * Draws a point on the {@link JXG.Board}. 308 * @param {JXG.Point} el Reference to a {@link JXG.Point} object that has to be drawn. 309 * @see Point 310 * @see JXG.Point 311 * @see JXG.AbstractRenderer#updatePoint 312 * @see JXG.AbstractRenderer#changePointStyle 313 */ 314 drawPoint: function (el) { 315 var prim, 316 // Sometimes el is not a real point and lacks the methods of a JXG.Point instance, 317 // in these cases to not use el directly. 318 face = Options.normalizePointFace(el.evalVisProp('face')); 319 320 // Determine how the point looks like 321 if (face === "o") { 322 prim = "ellipse"; 323 } else if (face === "[]") { 324 prim = "rect"; 325 } else { 326 // cross/x, diamond/<>, triangleup/A/^, triangledown/v, triangleleft/<, 327 // triangleright/>, plus/+, |, - 328 prim = "path"; 329 } 330 331 el.rendNode = this.appendChildPrim( 332 this.createPrim(prim, el.id), 333 el.evalVisProp('layer') 334 ); 335 this.appendNodesToElement(el, prim); 336 337 // Adjust visual properties 338 this._updateVisual(el, { dash: true, shadow: true }, true); 339 340 // By now we only created the xml nodes and set some styles, in updatePoint 341 // the attributes are filled with data. 342 this.updatePoint(el); 343 }, 344 345 /** 346 * Updates visual appearance of the renderer element assigned to the given {@link JXG.Point}. 347 * @param {JXG.Point} el Reference to a {@link JXG.Point} object, that has to be updated. 348 * @see Point 349 * @see JXG.Point 350 * @see JXG.AbstractRenderer#drawPoint 351 * @see JXG.AbstractRenderer#changePointStyle 352 */ 353 updatePoint: function (el) { 354 var size = el.evalVisProp('size'), 355 // sometimes el is not a real point and lacks the methods of a JXG.Point instance, 356 // in these cases to not use el directly. 357 face = Options.normalizePointFace(el.evalVisProp('face')), 358 unit = el.evalVisProp('sizeunit'), 359 zoom = el.evalVisProp('zoom'), 360 s1; 361 362 if (!isNaN(el.coords.scrCoords[2] + el.coords.scrCoords[1])) { 363 if (unit === "user") { 364 size *= Math.sqrt(Math.abs(el.board.unitX * el.board.unitY)); 365 } 366 size *= !el.board || !zoom ? 1.0 : Math.sqrt(el.board.zoomX * el.board.zoomY); 367 s1 = size === 0 ? 0 : size + 1; 368 369 if (face === "o") { 370 // circle 371 this.updateEllipsePrim( 372 el.rendNode, 373 el.coords.scrCoords[1], 374 el.coords.scrCoords[2], 375 s1, 376 s1 377 ); 378 } else if (face === "[]") { 379 // rectangle 380 this.updateRectPrim( 381 el.rendNode, 382 el.coords.scrCoords[1] - size, 383 el.coords.scrCoords[2] - size, 384 size * 2, 385 size * 2 386 ); 387 } else { 388 // x, +, <>, <<>>, ^, v, <, > 389 this.updatePathPrim( 390 el.rendNode, 391 this.updatePathStringPoint(el, size, face), 392 el.board 393 ); 394 } 395 this._updateVisual(el, { dash: false, shadow: false }); 396 this.setShadow(el); 397 } 398 }, 399 400 /** 401 * Changes the style of a {@link JXG.Point}. This is required because the point styles differ in what 402 * elements have to be drawn, e.g. if the point is marked by a "x" or a "+" two lines are drawn, if 403 * it's marked by spot a circle is drawn. This method removes the old renderer element(s) and creates 404 * the new one(s). 405 * @param {JXG.Point} el Reference to a {@link JXG.Point} object, that's style is changed. 406 * @see Point 407 * @see JXG.Point 408 * @see JXG.AbstractRenderer#updatePoint 409 * @see JXG.AbstractRenderer#drawPoint 410 */ 411 changePointStyle: function (el) { 412 var node = this.getElementById(el.id); 413 414 // remove the existing point rendering node 415 if (Type.exists(node)) { 416 this.remove(node); 417 } 418 419 // and make a new one 420 this.drawPoint(el); 421 Type.clearVisPropOld(el); 422 423 if (!el.visPropCalc.visible) { 424 this.display(el, false); 425 } 426 427 if (el.evalVisProp('draft')) { 428 this.setDraft(el); 429 } 430 }, 431 432 /* ********* Line related stuff *********** */ 433 434 /** 435 * Draws a line on the {@link JXG.Board}. 436 * @param {JXG.Line} el Reference to a line object, that has to be drawn. 437 * @see Line 438 * @see JXG.Line 439 * @see JXG.AbstractRenderer#updateLine 440 */ 441 drawLine: function (el) { 442 el.rendNode = this.appendChildPrim( 443 this.createPrim("line", el.id), 444 el.evalVisProp('layer') 445 ); 446 this.appendNodesToElement(el, "lines"); 447 this.updateLine(el); 448 }, 449 450 /** 451 * Updates visual appearance of the renderer element assigned to the given {@link JXG.Line}. 452 * @param {JXG.Line} el Reference to the {@link JXG.Line} object that has to be updated. 453 * @see Line 454 * @see JXG.Line 455 * @see JXG.AbstractRenderer#drawLine 456 */ 457 updateLine: function (el) { 458 this._updateVisual(el); 459 this.updatePathWithArrowHeads(el); // Calls the renderer primitive 460 this.setLineCap(el); 461 }, 462 463 /* ********* Curve related stuff *********** */ 464 465 /** 466 * Draws a {@link JXG.Curve} on the {@link JXG.Board}. 467 * @param {JXG.Curve} el Reference to a graph object, that has to be plotted. 468 * @see Curve 469 * @see JXG.Curve 470 * @see JXG.AbstractRenderer#updateCurve 471 */ 472 drawCurve: function (el) { 473 el.rendNode = this.appendChildPrim( 474 this.createPrim("path", el.id), 475 el.evalVisProp('layer') 476 ); 477 this.appendNodesToElement(el, "path"); 478 this.updateCurve(el); 479 }, 480 481 /** 482 * Updates visual appearance of the renderer element assigned to the given {@link JXG.Curve}. 483 * @param {JXG.Curve} el Reference to a {@link JXG.Curve} object, that has to be updated. 484 * @see Curve 485 * @see JXG.Curve 486 * @see JXG.AbstractRenderer#drawCurve 487 */ 488 updateCurve: function (el) { 489 this._updateVisual(el); 490 this.updatePathWithArrowHeads(el); // Calls the renderer primitive 491 this.setLineCap(el); 492 }, 493 494 /* ********* Arrow heads and related stuff *********** */ 495 496 /** 497 * Handles arrow heads of a line or curve element and calls the renderer primitive. 498 * 499 * @param {JXG.GeometryElement} el Reference to a line or curve object that has to be drawn. 500 * @param {Boolean} doHighlight 501 * 502 * @private 503 * @see Line 504 * @see JXG.Line 505 * @see Curve 506 * @see JXG.Curve 507 * @see JXG.AbstractRenderer#updateLine 508 * @see JXG.AbstractRenderer#updateCurve 509 * @see JXG.AbstractRenderer#makeArrows 510 * @see JXG.AbstractRenderer#getArrowHeadData 511 */ 512 updatePathWithArrowHeads: function (el, doHighlight) { 513 var hl = doHighlight ? 'highlight' : '', 514 w, 515 arrowData; 516 517 if (doHighlight && el.evalVisProp('highlightstrokewidth')) { 518 w = Math.max( 519 el.evalVisProp('highlightstrokewidth'), 520 el.evalVisProp('strokewidth') 521 ); 522 } else { 523 w = el.evalVisProp('strokewidth'); 524 } 525 526 // Get information if there are arrow heads and how large they are. 527 arrowData = this.getArrowHeadData(el, w, hl); 528 529 // Create the SVG nodes if necessary 530 this.makeArrows(el, arrowData); 531 532 // Draw the paths with arrow heads 533 if (el.elementClass === Const.OBJECT_CLASS_LINE) { 534 this.updateLineWithEndings(el, arrowData); 535 } else if (el.elementClass === Const.OBJECT_CLASS_CURVE) { 536 this.updatePath(el); 537 } 538 539 this.setArrowSize(el, arrowData); 540 }, 541 542 /** 543 * This method determines some data about the line endings of this element. 544 * If there are arrow heads, the offset is determined so that no parts of the line stroke 545 * lap over the arrow head. 546 * <p> 547 * The returned object also contains the types of the arrow heads. 548 * 549 * @param {JXG.GeometryElement} el JSXGraph line or curve element 550 * @param {Number} strokewidth strokewidth of the element 551 * @param {String} hl Ither 'highlight' or empty string 552 * @returns {Object} object containing the data 553 * 554 * @private 555 */ 556 getArrowHeadData: function (el, strokewidth, hl) { 557 var minlen = Mat.eps, 558 typeFirst, 559 typeLast, 560 offFirst = 0, 561 offLast = 0, 562 sizeFirst = 0, 563 sizeLast = 0, 564 ev_fa = el.evalVisProp('firstarrow'), 565 ev_la = el.evalVisProp('lastarrow'), 566 off, 567 size; 568 569 /* 570 Handle arrow heads. 571 572 The default arrow head is an isosceles triangle with base length 10 units and height 10 units. 573 These 10 units are scaled to strokeWidth * arrowSize pixels. 574 */ 575 if (ev_fa || ev_la) { 576 if (Type.exists(ev_fa.type)) { 577 typeFirst = el.eval(ev_fa.type); 578 } else { 579 if (el.elementClass === Const.OBJECT_CLASS_LINE) { 580 typeFirst = 1; 581 } else { 582 typeFirst = 7; 583 } 584 } 585 if (Type.exists(ev_la.type)) { 586 typeLast = el.eval(ev_la.type); 587 } else { 588 if (el.elementClass === Const.OBJECT_CLASS_LINE) { 589 typeLast = 1; 590 } else { 591 typeLast = 7; 592 } 593 } 594 595 if (ev_fa) { 596 size = 6; 597 if (Type.exists(ev_fa.size)) { 598 size = el.eval(ev_fa.size); 599 } 600 if (hl !== "" && Type.exists(ev_fa[hl + "size"])) { 601 size = el.eval(ev_fa[hl + "size"]); 602 } 603 604 off = strokewidth * size; 605 if (typeFirst === 2) { 606 off *= 0.5; 607 minlen += strokewidth * size; 608 } else if (typeFirst === 3) { 609 off = (strokewidth * size) / 3; 610 minlen += strokewidth; 611 } else if (typeFirst === 4 || typeFirst === 5 || typeFirst === 6) { 612 off = (strokewidth * size) / 1.5; 613 minlen += strokewidth * size; 614 } else if (typeFirst === 7) { 615 off = 0; 616 size = 10; 617 minlen += strokewidth; 618 } else { 619 minlen += strokewidth * size; 620 } 621 offFirst += off; 622 sizeFirst = size; 623 } 624 625 if (ev_la) { 626 size = 6; 627 if (Type.exists(ev_la.size)) { 628 size = el.eval(ev_la.size); 629 } 630 if (hl !== "" && Type.exists(ev_la[hl + "size"])) { 631 size = el.eval(ev_la[hl + "size"]); 632 } 633 off = strokewidth * size; 634 if (typeLast === 2) { 635 off *= 0.5; 636 minlen += strokewidth * size; 637 } else if (typeLast === 3) { 638 off = (strokewidth * size) / 3; 639 minlen += strokewidth; 640 } else if (typeLast === 4 || typeLast === 5 || typeLast === 6) { 641 off = (strokewidth * size) / 1.5; 642 minlen += strokewidth * size; 643 } else if (typeLast === 7) { 644 off = 0; 645 size = 10; 646 minlen += strokewidth; 647 } else { 648 minlen += strokewidth * size; 649 } 650 offLast += off; 651 sizeLast = size; 652 } 653 } 654 el.visPropCalc.typeFirst = typeFirst; 655 el.visPropCalc.typeLast = typeLast; 656 657 return { 658 evFirst: ev_fa, 659 evLast: ev_la, 660 typeFirst: typeFirst, 661 typeLast: typeLast, 662 offFirst: offFirst, 663 offLast: offLast, 664 sizeFirst: sizeFirst, 665 sizeLast: sizeLast, 666 showFirst: 1, // Show arrow head. 0 if the distance is too small 667 showLast: 1, // Show arrow head. 0 if the distance is too small 668 minLen: minlen, 669 strokeWidth: strokewidth 670 }; 671 }, 672 673 /** 674 * Corrects the line length if there are arrow heads, such that 675 * the arrow ends exactly at the intended position. 676 * Calls the renderer method to draw the line. 677 * 678 * @param {JXG.Line} el Reference to a line object, that has to be drawn 679 * @param {Object} arrowData Data concerning possible arrow heads 680 * 681 * @returns {JXG.AbstractRenderer} Reference to the renderer 682 * 683 * @private 684 * @see Line 685 * @see JXG.Line 686 * @see JXG.AbstractRenderer#updateLine 687 * @see JXG.AbstractRenderer#getPositionArrowHead 688 * 689 */ 690 updateLineWithEndings: function (el, arrowData) { 691 var c1, 692 c2, 693 // useTotalLength = true, 694 margin = null; 695 696 c1 = new Coords(Const.COORDS_BY_USER, el.point1.coords.usrCoords, el.board); 697 c2 = new Coords(Const.COORDS_BY_USER, el.point2.coords.usrCoords, el.board); 698 margin = el.evalVisProp('margin'); 699 Geometry.calcStraight(el, c1, c2, margin); 700 701 this.handleTouchpoints(el, c1, c2, arrowData); 702 this.getPositionArrowHead(el, c1, c2, arrowData); 703 704 this.updateLinePrim( 705 el.rendNode, 706 c1.scrCoords[1], 707 c1.scrCoords[2], 708 c2.scrCoords[1], 709 c2.scrCoords[2], 710 el.board 711 ); 712 713 return this; 714 }, 715 716 /** 717 * 718 * Calls the renderer method to draw a curve. 719 * 720 * @param {JXG.GeometryElement} el Reference to a line object, that has to be drawn. 721 * @returns {JXG.AbstractRenderer} Reference to the renderer 722 * 723 * @private 724 * @see Curve 725 * @see JXG.Curve 726 * @see JXG.AbstractRenderer#updateCurve 727 * 728 */ 729 updatePath: function (el) { 730 if (el.evalVisProp('handdrawing')) { 731 this.updatePathPrim(el.rendNode, this.updatePathStringBezierPrim(el), el.board); 732 } else { 733 this.updatePathPrim(el.rendNode, this.updatePathStringPrim(el), el.board); 734 } 735 736 return this; 737 }, 738 739 /** 740 * Shorten the length of a line element such that the arrow head touches 741 * the start or end point and such that the arrow head ends exactly 742 * at the start / end position of the line. 743 * <p> 744 * The Coords objects c1 and c2 are changed in place. In object a, the Boolean properties 745 * 'showFirst' and 'showLast' are set. 746 * 747 * @param {JXG.Line} el Reference to the line object that gets arrow heads. 748 * @param {JXG.Coords} c1 Coords of the first point of the line (after {@link JXG.Math.Geometry#calcStraight}). 749 * @param {JXG.Coords} c2 Coords of the second point of the line (after {@link JXG.Math.Geometry#calcStraight}). 750 * @param {Object} a Object { evFirst: Boolean, evLast: Boolean} containing information about arrow heads. 751 * @see JXG.AbstractRenderer#getArrowHeadData 752 * 753 */ 754 getPositionArrowHead: function (el, c1, c2, a) { 755 var d, d1x, d1y, d2x, d2y; 756 757 // Handle arrow heads. 758 759 // The default arrow head (type==1) is an isosceles triangle with base length 10 units and height 10 units. 760 // These 10 units are scaled to strokeWidth * arrowSize pixels. 761 if (a.evFirst || a.evLast) { 762 // Correct the position of the arrow heads 763 d1x = d1y = d2x = d2y = 0.0; 764 d = c1.distance(Const.COORDS_BY_SCREEN, c2); 765 766 if (a.evFirst && el.board.renderer.type !== "vml") { 767 if (d >= a.minLen) { 768 d1x = ((c2.scrCoords[1] - c1.scrCoords[1]) * a.offFirst) / d; 769 d1y = ((c2.scrCoords[2] - c1.scrCoords[2]) * a.offFirst) / d; 770 } else { 771 a.showFirst = 0; 772 } 773 } 774 775 if (a.evLast && el.board.renderer.type !== "vml") { 776 if (d >= a.minLen) { 777 d2x = ((c2.scrCoords[1] - c1.scrCoords[1]) * a.offLast) / d; 778 d2y = ((c2.scrCoords[2] - c1.scrCoords[2]) * a.offLast) / d; 779 } else { 780 a.showLast = 0; 781 } 782 } 783 c1.setCoordinates( 784 Const.COORDS_BY_SCREEN, 785 [c1.scrCoords[1] + d1x, c1.scrCoords[2] + d1y], 786 false, 787 true 788 ); 789 c2.setCoordinates( 790 Const.COORDS_BY_SCREEN, 791 [c2.scrCoords[1] - d2x, c2.scrCoords[2] - d2y], 792 false, 793 true 794 ); 795 } 796 797 return this; 798 }, 799 800 /** 801 * Handle touchlastpoint / touchfirstpoint 802 * 803 * @param {JXG.GeometryElement} el 804 * @param {JXG.Coords} c1 Coordinates of the start of the line. The coordinates are changed in place. 805 * @param {JXG.Coords} c2 Coordinates of the end of the line. The coordinates are changed in place. 806 * @param {Object} a 807 * @see JXG.AbstractRenderer#getArrowHeadData 808 */ 809 handleTouchpoints: function (el, c1, c2, a) { 810 var s1, s2, d, d1x, d1y, d2x, d2y; 811 812 if (a.evFirst || a.evLast) { 813 d = d1x = d1y = d2x = d2y = 0.0; 814 815 s1 = el.point1.evalVisProp('size') + 816 el.point1.evalVisProp('strokewidth'); 817 818 s2 = el.point2.evalVisProp('size') + 819 el.point2.evalVisProp('strokewidth'); 820 821 // Handle touchlastpoint /touchfirstpoint 822 if (a.evFirst && el.evalVisProp('touchfirstpoint') && 823 el.point1.evalVisProp('visible')) { 824 d = c1.distance(Const.COORDS_BY_SCREEN, c2); 825 //if (d > s) { 826 d1x = ((c2.scrCoords[1] - c1.scrCoords[1]) * s1) / d; 827 d1y = ((c2.scrCoords[2] - c1.scrCoords[2]) * s1) / d; 828 //} 829 } 830 if (a.evLast && el.evalVisProp('touchlastpoint') && 831 el.point2.evalVisProp('visible')) { 832 d = c1.distance(Const.COORDS_BY_SCREEN, c2); 833 //if (d > s) { 834 d2x = ((c2.scrCoords[1] - c1.scrCoords[1]) * s2) / d; 835 d2y = ((c2.scrCoords[2] - c1.scrCoords[2]) * s2) / d; 836 //} 837 } 838 c1.setCoordinates( 839 Const.COORDS_BY_SCREEN, 840 [c1.scrCoords[1] + d1x, c1.scrCoords[2] + d1y], 841 false, 842 true 843 ); 844 c2.setCoordinates( 845 Const.COORDS_BY_SCREEN, 846 [c2.scrCoords[1] - d2x, c2.scrCoords[2] - d2y], 847 false, 848 true 849 ); 850 } 851 852 return this; 853 }, 854 855 /** 856 * Set the arrow head size. 857 * 858 * @param {JXG.GeometryElement} el Reference to a line or curve object that has to be drawn. 859 * @param {Object} arrowData Data concerning possible arrow heads 860 * @returns {JXG.AbstractRenderer} Reference to the renderer 861 * 862 * @private 863 * @see Line 864 * @see JXG.Line 865 * @see Curve 866 * @see JXG.Curve 867 * @see JXG.AbstractRenderer#updatePathWithArrowHeads 868 * @see JXG.AbstractRenderer#getArrowHeadData 869 */ 870 setArrowSize: function (el, a) { 871 if (a.evFirst) { 872 this._setArrowWidth( 873 el.rendNodeTriangleStart, 874 a.showFirst * a.strokeWidth, 875 el.rendNode, 876 a.sizeFirst 877 ); 878 } 879 if (a.evLast) { 880 this._setArrowWidth( 881 el.rendNodeTriangleEnd, 882 a.showLast * a.strokeWidth, 883 el.rendNode, 884 a.sizeLast 885 ); 886 } 887 return this; 888 }, 889 890 /** 891 * Update the line endings (linecap) of a straight line from its attribute 892 * 'linecap'. 893 * Possible values for the attribute 'linecap' are: 'butt', 'round', 'square'. 894 * The default value is 'butt'. Not available for VML renderer. 895 * 896 * @param {JXG.Line} element A arbitrary line. 897 * @see Line 898 * @see JXG.Line 899 * @see JXG.AbstractRenderer#updateLine 900 */ 901 setLineCap: function (el) { /* stub */ }, 902 903 /* ********* Ticks related stuff *********** */ 904 905 /** 906 * Creates a rendering node for ticks added to a line. 907 * @param {JXG.Line} el A arbitrary line. 908 * @see Line 909 * @see Ticks 910 * @see JXG.Line 911 * @see JXG.Ticks 912 * @see JXG.AbstractRenderer#updateTicks 913 */ 914 drawTicks: function (el) { 915 el.rendNode = this.appendChildPrim( 916 this.createPrim("path", el.id), 917 el.evalVisProp('layer') 918 ); 919 this.appendNodesToElement(el, "path"); 920 }, 921 922 /** 923 * Update {@link Ticks} on a {@link JXG.Line}. This method is only a stub and has to be implemented 924 * in any descendant renderer class. 925 * @param {JXG.Ticks} el Reference of a ticks object that has to be updated. 926 * @see Line 927 * @see Ticks 928 * @see JXG.Line 929 * @see JXG.Ticks 930 * @see JXG.AbstractRenderer#drawTicks 931 */ 932 updateTicks: function (el) { /* stub */ }, 933 934 /* ********* Circle related stuff *********** */ 935 936 /** 937 * Draws a {@link JXG.Circle} 938 * @param {JXG.Circle} el Reference to a {@link JXG.Circle} object that has to be drawn. 939 * @see Circle 940 * @see JXG.Circle 941 * @see JXG.AbstractRenderer#updateEllipse 942 */ 943 drawEllipse: function (el) { 944 el.rendNode = this.appendChildPrim( 945 this.createPrim("ellipse", el.id), 946 el.evalVisProp('layer') 947 ); 948 this.appendNodesToElement(el, "ellipse"); 949 this.updateEllipse(el); 950 }, 951 952 /** 953 * Updates visual appearance of a given {@link JXG.Circle} on the {@link JXG.Board}. 954 * @param {JXG.Circle} el Reference to a {@link JXG.Circle} object, that has to be updated. 955 * @see Circle 956 * @see JXG.Circle 957 * @see JXG.AbstractRenderer#drawEllipse 958 */ 959 updateEllipse: function (el) { 960 this._updateVisual(el); 961 962 var radius = el.Radius(); 963 964 if ( 965 /*radius > 0.0 &&*/ 966 Math.abs(el.center.coords.usrCoords[0]) > Mat.eps && 967 !isNaN(radius + el.center.coords.scrCoords[1] + el.center.coords.scrCoords[2]) && 968 radius * el.board.unitX < 2000000 969 ) { 970 this.updateEllipsePrim( 971 el.rendNode, 972 el.center.coords.scrCoords[1], 973 el.center.coords.scrCoords[2], 974 radius * el.board.unitX, 975 radius * el.board.unitY 976 ); 977 } 978 this.setLineCap(el); 979 }, 980 981 /* ********* Polygon related stuff *********** */ 982 983 /** 984 * Draws a {@link JXG.Polygon} on the {@link JXG.Board}. 985 * @param {JXG.Polygon} el Reference to a Polygon object, that is to be drawn. 986 * @see Polygon 987 * @see JXG.Polygon 988 * @see JXG.AbstractRenderer#updatePolygon 989 */ 990 drawPolygon: function (el) { 991 el.rendNode = this.appendChildPrim( 992 this.createPrim("polygon", el.id), 993 el.evalVisProp('layer') 994 ); 995 this.appendNodesToElement(el, "polygon"); 996 this.updatePolygon(el); 997 }, 998 999 /** 1000 * Updates properties of a {@link JXG.Polygon}'s rendering node. 1001 * @param {JXG.Polygon} el Reference to a {@link JXG.Polygon} object, that has to be updated. 1002 * @see Polygon 1003 * @see JXG.Polygon 1004 * @see JXG.AbstractRenderer#drawPolygon 1005 */ 1006 updatePolygon: function (el) { 1007 // Here originally strokecolor wasn't updated but strokewidth was. 1008 // But if there's no strokecolor i don't see why we should update strokewidth. 1009 this._updateVisual(el, { stroke: true, dash: true }); 1010 this.updatePolygonPrim(el.rendNode, el); 1011 }, 1012 1013 /* ********* Text related stuff *********** */ 1014 1015 /** 1016 * Shows a small copyright notice in the top left corner of the board. 1017 * @param {String} str The copyright notice itself 1018 * @param {Number} fontsize Size of the font the copyright notice is written in 1019 */ 1020 displayCopyright: function (str, fontsize) { /* stub */ }, 1021 1022 /** 1023 * An internal text is a {@link JXG.Text} element which is drawn using only 1024 * the given renderer but no HTML. This method is only a stub, the drawing 1025 * is done in the special renderers. 1026 * @param {JXG.Text} el Reference to a {@link JXG.Text} object 1027 * @see Text 1028 * @see JXG.Text 1029 * @see JXG.AbstractRenderer#updateInternalText 1030 * @see JXG.AbstractRenderer#drawText 1031 * @see JXG.AbstractRenderer#updateText 1032 * @see JXG.AbstractRenderer#updateTextStyle 1033 */ 1034 drawInternalText: function (el) { /* stub */ }, 1035 1036 /** 1037 * Updates visual properties of an already existing {@link JXG.Text} element. 1038 * @param {JXG.Text} el Reference to an {@link JXG.Text} object, that has to be updated. 1039 * @see Text 1040 * @see JXG.Text 1041 * @see JXG.AbstractRenderer#drawInternalText 1042 * @see JXG.AbstractRenderer#drawText 1043 * @see JXG.AbstractRenderer#updateText 1044 * @see JXG.AbstractRenderer#updateTextStyle 1045 */ 1046 updateInternalText: function (el) { /* stub */ }, 1047 1048 /** 1049 * Displays a {@link JXG.Text} on the {@link JXG.Board} by putting a HTML div over it. 1050 * @param {JXG.Text} el Reference to an {@link JXG.Text} object, that has to be displayed 1051 * @see Text 1052 * @see JXG.Text 1053 * @see JXG.AbstractRenderer#drawInternalText 1054 * @see JXG.AbstractRenderer#updateText 1055 * @see JXG.AbstractRenderer#updateInternalText 1056 * @see JXG.AbstractRenderer#updateTextStyle 1057 */ 1058 drawText: function (el) { 1059 var node, z, level, ev_visible; 1060 1061 if ( 1062 el.evalVisProp('display') === "html" && 1063 Env.isBrowser && 1064 this.type !== "no" 1065 ) { 1066 node = this.container.ownerDocument.createElement("div"); 1067 //node = this.container.ownerDocument.createElementNS('http://www.w3.org/1999/xhtml', 'div'); // 1068 node.style.position = "absolute"; 1069 node.className = el.evalVisProp('cssclass'); 1070 1071 level = el.evalVisProp('layer'); 1072 if (!Type.exists(level)) { 1073 // trace nodes have level not set 1074 level = 0; 1075 } 1076 1077 if (this.container.style.zIndex === "") { 1078 z = 0; 1079 } else { 1080 z = parseInt(this.container.style.zIndex, 10); 1081 } 1082 1083 node.style.zIndex = z + level; 1084 this.container.appendChild(node); 1085 1086 node.setAttribute("id", this.container.id + "_" + el.id); 1087 } else { 1088 node = this.drawInternalText(el); 1089 } 1090 1091 el.rendNode = node; 1092 el.htmlStr = ""; 1093 1094 // Set el.visPropCalc.visible 1095 if (el.visProp.islabel && Type.exists(el.visProp.anchor)) { 1096 ev_visible = el.visProp.anchor.evalVisProp('visible'); 1097 el.prepareUpdate().updateVisibility(ev_visible); 1098 } else { 1099 el.prepareUpdate().updateVisibility(); 1100 } 1101 this.updateText(el); 1102 }, 1103 1104 /** 1105 * Updates visual properties of an already existing {@link JXG.Text} element. 1106 * @param {JXG.Text} el Reference to an {@link JXG.Text} object, that has to be updated. 1107 * @see Text 1108 * @see JXG.Text 1109 * @see JXG.AbstractRenderer#drawText 1110 * @see JXG.AbstractRenderer#drawInternalText 1111 * @see JXG.AbstractRenderer#updateInternalText 1112 * @see JXG.AbstractRenderer#updateTextStyle 1113 */ 1114 updateText: function (el) { 1115 var content = el.plaintext, 1116 v, c, 1117 parentNode, node, 1118 // scale, vshift, 1119 // id, wrap_id, 1120 ax, ay, angle, co, si, 1121 to_h, to_v; 1122 1123 if (el.visPropCalc.visible) { 1124 this.updateTextStyle(el, false); 1125 1126 if (el.evalVisProp('display') === "html" && this.type !== "no") { 1127 // Set the position 1128 if (!isNaN(el.coords.scrCoords[1] + el.coords.scrCoords[2])) { 1129 // Horizontal 1130 c = el.coords.scrCoords[1]; 1131 // webkit seems to fail for extremely large values for c. 1132 c = Math.abs(c) < 1000000 ? c : 1000000; 1133 ax = el.getAnchorX(); 1134 1135 if (ax === "right") { 1136 // v = Math.floor(el.board.canvasWidth - c); 1137 v = el.board.canvasWidth - c; 1138 to_h = "right"; 1139 } else if (ax === "middle") { 1140 // v = Math.floor(c - 0.5 * el.size[0]); 1141 v = c - 0.5 * el.size[0]; 1142 to_h = "center"; 1143 } else { 1144 // 'left' 1145 // v = Math.floor(c); 1146 v = c; 1147 to_h = "left"; 1148 } 1149 1150 // This may be useful for foreignObj. 1151 //if (window.devicePixelRatio !== undefined) { 1152 //v *= window.devicePixelRatio; 1153 //} 1154 1155 if (el.visPropOld.left !== ax + v) { 1156 if (ax === "right") { 1157 el.rendNode.style.right = v + "px"; 1158 el.rendNode.style.left = "auto"; 1159 } else { 1160 el.rendNode.style.left = v + "px"; 1161 el.rendNode.style.right = "auto"; 1162 } 1163 el.visPropOld.left = ax + v; 1164 } 1165 1166 // Vertical 1167 c = el.coords.scrCoords[2] + this.vOffsetText; 1168 c = Math.abs(c) < 1000000 ? c : 1000000; 1169 ay = el.getAnchorY(); 1170 1171 if (ay === "bottom") { 1172 // v = Math.floor(el.board.canvasHeight - c); 1173 v = el.board.canvasHeight - c; 1174 to_v = "bottom"; 1175 } else if (ay === "middle") { 1176 // v = Math.floor(c - 0.5 * el.size[1]); 1177 v = c - 0.5 * el.size[1]; 1178 to_v = "center"; 1179 } else { 1180 // top 1181 // v = Math.floor(c); 1182 v = c; 1183 to_v = "top"; 1184 } 1185 1186 // This may be useful for foreignObj. 1187 //if (window.devicePixelRatio !== undefined) { 1188 //v *= window.devicePixelRatio; 1189 //} 1190 1191 if (el.visPropOld.top !== ay + v) { 1192 if (ay === "bottom") { 1193 el.rendNode.style.top = "auto"; 1194 el.rendNode.style.bottom = v + "px"; 1195 } else { 1196 el.rendNode.style.bottom = "auto"; 1197 el.rendNode.style.top = v + "px"; 1198 } 1199 el.visPropOld.top = ay + v; 1200 } 1201 } 1202 1203 // Set the content 1204 if (el.htmlStr !== content) { 1205 try { 1206 if (el.type === Type.OBJECT_TYPE_BUTTON) { 1207 el.rendNodeButton.innerHTML = content; 1208 } else if ( 1209 el.type === Type.OBJECT_TYPE_CHECKBOX || 1210 el.type === Type.OBJECT_TYPE_INPUT 1211 ) { 1212 el.rendNodeLabel.innerHTML = content; 1213 } else { 1214 el.rendNode.innerHTML = content; 1215 } 1216 } catch (e) { 1217 // Setting innerHTML sometimes fails in IE8. 1218 // A workaround is to take the node off the DOM, assign innerHTML, 1219 // then append back. 1220 // Works for text elements as they are absolutely positioned. 1221 parentNode = el.rendNode.parentNode; 1222 el.rendNode.parentNode.removeChild(el.rendNode); 1223 el.rendNode.innerHTML = content; 1224 parentNode.appendChild(el.rendNode); 1225 } 1226 el.htmlStr = content; 1227 1228 if (el.evalVisProp('usemathjax')) { 1229 // Typesetting directly might not work because mathjax was not loaded completely 1230 try { 1231 if (MathJax.typeset) { 1232 // Version 3 1233 MathJax.typeset([el.rendNode]); 1234 } else { 1235 // Version 2 1236 MathJax.Hub.Queue(["Typeset", MathJax.Hub, el.rendNode]); 1237 } 1238 1239 // Obsolete: 1240 // // Restore the transformation necessary for fullscreen mode 1241 // // MathJax removes it when handling dynamic content 1242 // id = el.board.container; 1243 // wrap_id = "fullscreenwrap_" + id; 1244 // if (document.getElementById(wrap_id)) { 1245 // scale = el.board.containerObj._cssFullscreenStore.scale; 1246 // vshift = el.board.containerObj._cssFullscreenStore.vshift; 1247 // Env.scaleJSXGraphDiv( 1248 // "#" + wrap_id, 1249 // "#" + id, 1250 // scale, 1251 // vshift 1252 // ); 1253 // } 1254 } catch (e) { 1255 JXG.debug("MathJax (not yet) loaded"); 1256 } 1257 } else if (el.evalVisProp('usekatex')) { 1258 try { 1259 // Checkboxes et. al. do not possess rendNodeLabel during the first update. 1260 // In this case node will be undefined and not rendered by KaTeX. 1261 if (el.rendNode.innerHTML.indexOf('<span') === 0 && 1262 el.rendNode.innerHTML.indexOf('<label') > 0 && 1263 ( 1264 el.rendNode.innerHTML.indexOf('<checkbox') > 0 || 1265 el.rendNode.innerHTML.indexOf('<input') > 0 1266 ) 1267 ) { 1268 node = el.rendNodeLabel; 1269 } else if (el.rendNode.innerHTML.indexOf('<button') === 0) { 1270 node = el.rendNodeButton; 1271 } else { 1272 node = el.rendNode; 1273 } 1274 1275 if (node) { 1276 /* eslint-disable no-undef */ 1277 katex.render(content, node, { 1278 macros: el.evalVisProp('katexmacros'), 1279 throwOnError: false 1280 }); 1281 /* eslint-enable no-undef */ 1282 } 1283 } catch (e) { 1284 JXG.debug("KaTeX not loaded (yet)"); 1285 } 1286 } else if (el.evalVisProp('useasciimathml')) { 1287 // This is not a constructor. 1288 // See http://asciimath.org/ for more information 1289 // about AsciiMathML and the project's source code. 1290 try { 1291 AMprocessNode(el.rendNode, false); 1292 } catch (e) { 1293 JXG.debug("AsciiMathML not loaded (yet)"); 1294 } 1295 } 1296 } 1297 1298 angle = el.evalVisProp('rotate'); 1299 if (angle !== 0) { 1300 // Don't forget to convert to rad 1301 angle *= (Math.PI / 180); 1302 co = Math.cos(angle); 1303 si = Math.sin(angle); 1304 1305 el.rendNode.style['transform'] = 'matrix(' + 1306 [co, -1 * si, si, co, 0, 0].join(',') + 1307 ')'; 1308 el.rendNode.style['transform-origin'] = to_h + ' ' + to_v; 1309 } 1310 this.transformRect(el, el.transformations); 1311 } else { 1312 this.updateInternalText(el); 1313 } 1314 } 1315 }, 1316 1317 /** 1318 * Converts string containing CSS properties into 1319 * array with key-value pair objects. 1320 * 1321 * @example 1322 * "color:blue; background-color:yellow" is converted to 1323 * [{'color': 'blue'}, {'backgroundColor': 'yellow'}] 1324 * 1325 * @param {String} cssString String containing CSS properties 1326 * @return {Array} Array of CSS key-value pairs 1327 */ 1328 _css2js: function (cssString) { 1329 var pairs = [], 1330 i, 1331 len, 1332 key, 1333 val, 1334 s, 1335 list = Type.trim(cssString).replace(/;$/, "").split(";"); 1336 1337 len = list.length; 1338 for (i = 0; i < len; ++i) { 1339 if (Type.trim(list[i]) !== "") { 1340 s = list[i].split(":"); 1341 key = Type.trim( 1342 s[0].replace(/-([a-z])/gi, function (match, char) { 1343 return char.toUpperCase(); 1344 }) 1345 ); 1346 val = Type.trim(s[1]); 1347 pairs.push({ key: key, val: val }); 1348 } 1349 } 1350 return pairs; 1351 }, 1352 1353 /** 1354 * Updates font-size, color and opacity propertiey and CSS style properties of a {@link JXG.Text} node. 1355 * This function is also called by highlight() and nohighlight(). 1356 * @param {JXG.Text} el Reference to the {@link JXG.Text} object, that has to be updated. 1357 * @param {Boolean} doHighlight 1358 * @see Text 1359 * @see JXG.Text 1360 * @see JXG.AbstractRenderer#drawText 1361 * @see JXG.AbstractRenderer#drawInternalText 1362 * @see JXG.AbstractRenderer#updateText 1363 * @see JXG.AbstractRenderer#updateInternalText 1364 * @see JXG.AbstractRenderer#updateInternalTextStyle 1365 */ 1366 updateTextStyle: function (el, doHighlight) { 1367 var fs, 1368 so, sc, 1369 css, 1370 node, 1371 display = Env.isBrowser ? el.visProp.display : "internal", 1372 nodeList = ["rendNode", "rendNodeTag", "rendNodeLabel"], 1373 lenN = nodeList.length, 1374 fontUnit = el.evalVisProp('fontunit'), 1375 cssList, 1376 prop, 1377 style, 1378 cssString, 1379 styleList = ["cssdefaultstyle", "cssstyle"], 1380 lenS = styleList.length; 1381 1382 if (doHighlight) { 1383 sc = el.evalVisProp('highlightstrokecolor'); 1384 so = el.evalVisProp('highlightstrokeopacity'); 1385 css = el.evalVisProp('highlightcssclass'); 1386 } else { 1387 sc = el.evalVisProp('strokecolor'); 1388 so = el.evalVisProp('strokeopacity'); 1389 css = el.evalVisProp('cssclass'); 1390 } 1391 1392 // This part is executed for all text elements except internal texts in canvas. 1393 // HTML-texts or internal texts in SVG or VML. 1394 // HTML internal 1395 // SVG + + 1396 // VML + + 1397 // canvas + - 1398 // no - - 1399 if (this.type !== "no" && (display === "html" || this.type !== "canvas")) { 1400 for (style = 0; style < lenS; style++) { 1401 // First set cssString to 1402 // ev.cssdefaultstyle of ev.highlightcssdefaultstyle, 1403 // then to 1404 // ev.cssstyle of ev.highlightcssstyle 1405 cssString = el.evalVisProp( 1406 (doHighlight ? 'highlight' : '') + styleList[style] 1407 ); 1408 // Set the CSS style properties - without deleting other properties 1409 if (cssString !== "" && el.visPropOld[styleList[style]] !== cssString) { 1410 cssList = this._css2js(cssString); 1411 for (node = 0; node < lenN; node++) { 1412 if (Type.exists(el[nodeList[node]])) { 1413 for (prop in cssList) { 1414 if (cssList.hasOwnProperty(prop)) { 1415 el[nodeList[node]].style[cssList[prop].key] = 1416 cssList[prop].val; 1417 } 1418 } 1419 } 1420 } 1421 el.visPropOld[styleList[style]] = cssString; 1422 } 1423 } 1424 1425 fs = el.evalVisProp('fontsize'); 1426 if (el.visPropOld.fontsize !== fs) { 1427 el.needsSizeUpdate = true; 1428 try { 1429 for (node = 0; node < lenN; node++) { 1430 if (Type.exists(el[nodeList[node]])) { 1431 el[nodeList[node]].style.fontSize = fs + fontUnit; 1432 } 1433 } 1434 } catch (e) { 1435 // IE needs special treatment. 1436 for (node = 0; node < lenN; node++) { 1437 if (Type.exists(el[nodeList[node]])) { 1438 el[nodeList[node]].style.fontSize = fs; 1439 } 1440 } 1441 } 1442 el.visPropOld.fontsize = fs; 1443 } 1444 } 1445 1446 this.setTabindex(el); 1447 1448 this.setObjectTransition(el); 1449 if (display === "html" && this.type !== "no") { 1450 // Set new CSS class 1451 if (el.visPropOld.cssclass !== css) { 1452 el.rendNode.className = css; 1453 el.visPropOld.cssclass = css; 1454 el.needsSizeUpdate = true; 1455 } 1456 this.setObjectStrokeColor(el, sc, so); 1457 } else { 1458 this.updateInternalTextStyle(el, sc, so); 1459 } 1460 1461 if (el.evalVisProp('aria.enabled')) { 1462 this.setARIA(el); 1463 } 1464 1465 return this; 1466 }, 1467 1468 /** 1469 * Set color and opacity of internal texts. 1470 * This method is used for Canvas and VML. 1471 * SVG needs its own version. 1472 * @private 1473 * @see JXG.AbstractRenderer#updateTextStyle 1474 * @see JXG.SVGRenderer#updateInternalTextStyle 1475 */ 1476 updateInternalTextStyle: function (el, strokeColor, strokeOpacity) { 1477 this.setObjectStrokeColor(el, strokeColor, strokeOpacity); 1478 }, 1479 1480 /* ********* Image related stuff *********** */ 1481 1482 /** 1483 * Draws an {@link JXG.Image} on a board; This is just a template that has to be implemented by special 1484 * renderers. 1485 * @param {JXG.Image} el Reference to the image object that is to be drawn 1486 * @see Image 1487 * @see JXG.Image 1488 * @see JXG.AbstractRenderer#updateImage 1489 */ 1490 drawImage: function (el) { /* stub */ }, 1491 1492 /** 1493 * Updates the properties of an {@link JXG.Image} element. 1494 * @param {JXG.Image} el Reference to an {@link JXG.Image} object, that has to be updated. 1495 * @see Image 1496 * @see JXG.Image 1497 * @see JXG.AbstractRenderer#drawImage 1498 */ 1499 updateImage: function (el) { 1500 this.updateRectPrim( 1501 el.rendNode, 1502 el.coords.scrCoords[1], 1503 el.coords.scrCoords[2] - el.size[1], 1504 el.size[0], 1505 el.size[1] 1506 ); 1507 1508 this.updateImageURL(el); 1509 this.transformRect(el, el.transformations); 1510 this._updateVisual(el, { stroke: true, dash: true }, true); 1511 }, 1512 1513 /** 1514 * Multiplication of transformations without updating. That means, at that point it is expected that the 1515 * matrices contain numbers only. First, the origin in user coords is translated to <tt>(0,0)</tt> in screen 1516 * coords. Then, the stretch factors are divided out. After the transformations in user coords, the stretch 1517 * factors are multiplied in again, and the origin in user coords is translated back to its position. This 1518 * method does not have to be implemented in a new renderer. 1519 * @param {JXG.GeometryElement} el A JSXGraph element. We only need its board property. 1520 * @param {Array} transformations An array of JXG.Transformations. 1521 * @returns {Array} A matrix represented by a two dimensional array of numbers. 1522 * @see JXG.AbstractRenderer#transformRect 1523 */ 1524 joinTransforms: function (el, transformations) { 1525 var i, 1526 ox = el.board.origin.scrCoords[1], 1527 oy = el.board.origin.scrCoords[2], 1528 ux = el.board.unitX, 1529 uy = el.board.unitY, 1530 1531 len = transformations.length, 1532 // Translate to 0,0 in screen coords and then scale 1533 m = [ 1534 [1, 0, 0], 1535 [-ox / ux, 1 / ux, 0], 1536 [oy / uy, 0, -1 / uy] 1537 ]; 1538 1539 for (i = 0; i < len; i++) { 1540 m = Mat.matMatMult(transformations[i].matrix, m); 1541 } 1542 // Scale back and then translate back 1543 m = Mat.matMatMult( 1544 [ 1545 [1, 0, 0], 1546 [ox, ux, 0], 1547 [oy, 0, -uy] 1548 ], 1549 m 1550 ); 1551 return m; 1552 }, 1553 1554 /** 1555 * Applies transformations on images and text elements. This method has to implemented in 1556 * all descendant classes where text and image transformations are to be supported. 1557 * <p> 1558 * Only affine transformation are supported, no proper projective transformations. This means, the 1559 * respective entries of the transformation matrix are simply ignored. 1560 * 1561 * @param {JXG.Image|JXG.Text} el A {@link JXG.Image} or {@link JXG.Text} object. 1562 * @param {Array} transformations An array of {@link JXG.Transformation} objects. This is usually the 1563 * transformations property of the given element <tt>el</tt>. 1564 */ 1565 transformRect: function (el, transformations) { /* stub */ }, 1566 1567 /** 1568 * If the URL of the image is provided by a function the URL has to be updated during updateImage() 1569 * @param {JXG.Image} el Reference to an image object. 1570 * @see JXG.AbstractRenderer#updateImage 1571 */ 1572 updateImageURL: function (el) { /* stub */ }, 1573 1574 /** 1575 * Updates CSS style properties of a {@link JXG.Image} node. 1576 * In SVGRenderer opacity is the only available style element. 1577 * This function is called by highlight() and nohighlight(). 1578 * This function works for VML. 1579 * It does not work for Canvas. 1580 * SVGRenderer overwrites this method. 1581 * @param {JXG.Text} el Reference to the {@link JXG.Image} object, that has to be updated. 1582 * @param {Boolean} doHighlight 1583 * @see Image 1584 * @see JXG.Image 1585 * @see JXG.AbstractRenderer#highlight 1586 * @see JXG.AbstractRenderer#noHighlight 1587 */ 1588 updateImageStyle: function (el, doHighlight) { 1589 el.rendNode.className = el.evalVisProp( 1590 doHighlight ? 'highlightcssclass' : 'cssclass' 1591 ); 1592 }, 1593 1594 drawForeignObject: function (el) { /* stub */ }, 1595 1596 updateForeignObject: function (el) { 1597 /* stub */ 1598 }, 1599 1600 /* ********* Render primitive objects *********** */ 1601 1602 /** 1603 * Appends a node to a specific layer level. This is just an abstract method and has to be implemented 1604 * in all renderers that want to use the <tt>createPrim</tt> model to draw. 1605 * @param {Node} node A DOM tree node. 1606 * @param {Number} level The layer the node is attached to. This is the index of the layer in 1607 * {@link JXG.SVGRenderer#layer} or the <tt>z-index</tt> style property of the node in VMLRenderer. 1608 */ 1609 appendChildPrim: function (node, level) { /* stub */ }, 1610 1611 /** 1612 * Stores the rendering nodes. This is an abstract method which has to be implemented in all renderers that use 1613 * the <tt>createPrim</tt> method. 1614 * @param {JXG.GeometryElement} el A JSXGraph element. 1615 * @param {String} type The XML node name. Only used in VMLRenderer. 1616 */ 1617 appendNodesToElement: function (el, type) { /* stub */ }, 1618 1619 /** 1620 * Creates a node of a given type with a given id. 1621 * @param {String} type The type of the node to create. 1622 * @param {String} id Set the id attribute to this. 1623 * @returns {Node} Reference to the created node. 1624 */ 1625 createPrim: function (type, id) { /* stub */ return null; }, 1626 1627 /** 1628 * Removes an element node. Just a stub. 1629 * @param {Node} node The node to remove. 1630 */ 1631 remove: function (node) { /* stub */ }, 1632 1633 /** 1634 * Can be used to create the nodes to display arrows. This is an abstract method which has to be implemented 1635 * in any descendant renderer. 1636 * @param {JXG.GeometryElement} el The element the arrows are to be attached to. 1637 * @param {Object} arrowData Data concerning possible arrow heads 1638 * 1639 */ 1640 makeArrows: function (el, arrowData) { /* stub */ }, 1641 1642 /** 1643 * Updates width of an arrow DOM node. Used in 1644 * @param {Node} node The arrow node. 1645 * @param {Number} width 1646 * @param {Node} parentNode Used in IE only 1647 */ 1648 _setArrowWidth: function (node, width, parentNode) { /* stub */ }, 1649 1650 /** 1651 * Updates an ellipse node primitive. This is an abstract method which has to be implemented in all renderers 1652 * that use the <tt>createPrim</tt> method. 1653 * @param {Node} node Reference to the node. 1654 * @param {Number} x Centre X coordinate 1655 * @param {Number} y Centre Y coordinate 1656 * @param {Number} rx The x-axis radius. 1657 * @param {Number} ry The y-axis radius. 1658 */ 1659 updateEllipsePrim: function (node, x, y, rx, ry) { /* stub */ }, 1660 1661 /** 1662 * Refreshes a line node. This is an abstract method which has to be implemented in all renderers that use 1663 * the <tt>createPrim</tt> method. 1664 * @param {Node} node The node to be refreshed. 1665 * @param {Number} p1x The first point's x coordinate. 1666 * @param {Number} p1y The first point's y coordinate. 1667 * @param {Number} p2x The second point's x coordinate. 1668 * @param {Number} p2y The second point's y coordinate. 1669 * @param {JXG.Board} board 1670 */ 1671 updateLinePrim: function (node, p1x, p1y, p2x, p2y, board) { /* stub */ }, 1672 1673 /** 1674 * Updates a path element. This is an abstract method which has to be implemented in all renderers that use 1675 * the <tt>createPrim</tt> method. 1676 * @param {Node} node The path node. 1677 * @param {String} pathString A string formatted like e.g. <em>'M 1,2 L 3,1 L5,5'</em>. The format of the string 1678 * depends on the rendering engine. 1679 * @param {JXG.Board} board Reference to the element's board. 1680 */ 1681 updatePathPrim: function (node, pathString, board) { /* stub */ }, 1682 1683 /** 1684 * Builds a path data string to draw a point with a face other than <em>rect</em> and <em>circle</em>. Since 1685 * the format of such a string usually depends on the renderer this method 1686 * is only an abstract method. Therefore, it has to be implemented in the descendant renderer itself unless 1687 * the renderer does not use the createPrim interface but the draw* interfaces to paint. 1688 * @param {JXG.Point} el The point element 1689 * @param {Number} size A positive number describing the size. Usually the half of the width and height of 1690 * the drawn point. 1691 * @param {String} type A string describing the point's face. This method only accepts the shortcut version of 1692 * each possible face: <tt>x, +, |, -, [], <>, <<>>,^, v, >, < </tt> 1693 */ 1694 updatePathStringPoint: function (el, size, type) { /* stub */ }, 1695 1696 /** 1697 * Builds a path data string from a {@link JXG.Curve} element. Since the path data strings heavily depend on the 1698 * underlying rendering technique this method is just a stub. Although such a path string is of no use for the 1699 * CanvasRenderer, this method is used there to draw a path directly. 1700 * @param {JXG.GeometryElement} el 1701 */ 1702 updatePathStringPrim: function (el) { /* stub */ }, 1703 1704 /** 1705 * Builds a path data string from a {@link JXG.Curve} element such that the curve looks like hand drawn. Since 1706 * the path data strings heavily depend on the underlying rendering technique this method is just a stub. 1707 * Although such a path string is of no use for the CanvasRenderer, this method is used there to draw a path 1708 * directly. 1709 * @param {JXG.GeometryElement} el 1710 */ 1711 updatePathStringBezierPrim: function (el) { /* stub */ }, 1712 1713 /** 1714 * Update a polygon primitive. 1715 * @param {Node} node 1716 * @param {JXG.Polygon} el A JSXGraph element of type {@link JXG.Polygon} 1717 */ 1718 updatePolygonPrim: function (node, el) { /* stub */ }, 1719 1720 /** 1721 * Update a rectangle primitive. This is used only for points with face of type 'rect'. 1722 * @param {Node} node The node yearning to be updated. 1723 * @param {Number} x x coordinate of the top left vertex. 1724 * @param {Number} y y coordinate of the top left vertex. 1725 * @param {Number} w Width of the rectangle. 1726 * @param {Number} h The rectangle's height. 1727 */ 1728 updateRectPrim: function (node, x, y, w, h) { /* stub */ }, 1729 1730 /* ********* Set attributes *********** */ 1731 1732 /** 1733 * Shows or hides an element on the canvas; Only a stub, requires implementation in the derived renderer. 1734 * @param {JXG.GeometryElement} el Reference to the object that has to appear. 1735 * @param {Boolean} value true to show the element, false to hide the element. 1736 */ 1737 display: function (el, value) { 1738 if (el) { 1739 el.visPropOld.visible = value; 1740 } 1741 }, 1742 1743 /** 1744 * Hides an element on the canvas; Only a stub, requires implementation in the derived renderer. 1745 * 1746 * Please use JXG.AbstractRenderer#display instead 1747 * @param {JXG.GeometryElement} el Reference to the geometry element that has to disappear. 1748 * @see JXG.AbstractRenderer#show 1749 * @deprecated 1750 */ 1751 hide: function (el) { /* stub */ }, 1752 1753 /** 1754 * Highlights an object, i.e. changes the current colors of the object to its highlighting colors 1755 * and highlighting strokewidth. 1756 * @param {JXG.GeometryElement} el Reference of the object that will be highlighted. 1757 * @param {Boolean} [suppressHighlightStrokeWidth=undefined] If undefined or false, highlighting also changes strokeWidth. This might not be 1758 * the cases for polygon borders. Thus, if a polygon is highlighted, its polygon borders change strokeWidth only if the polygon attribute 1759 * highlightByStrokeWidth == true. 1760 * @returns {JXG.AbstractRenderer} Reference to the renderer 1761 * @see JXG.AbstractRenderer#updateTextStyle 1762 */ 1763 highlight: function (el, suppressHighlightStrokeWidth) { 1764 var i, do_hl, sw; 1765 1766 this.setObjectTransition(el); 1767 if (!el.visProp.draft) { 1768 if (el.type === Const.OBJECT_TYPE_POLYGON) { 1769 this.setObjectFillColor(el, el.evalVisProp('highlightfillcolor'), el.evalVisProp('highlightfillopacity')); 1770 do_hl = el.evalVisProp('highlightbystrokewidth'); 1771 for (i = 0; i < el.borders.length; i++) { 1772 this.highlight(el.borders[i], !do_hl); 1773 } 1774 } else { 1775 if (el.elementClass === Const.OBJECT_CLASS_TEXT) { 1776 this.updateTextStyle(el, true); 1777 } else if (el.type === Const.OBJECT_TYPE_IMAGE) { 1778 this.updateImageStyle(el, true); 1779 this.setObjectFillColor( 1780 el, 1781 el.evalVisProp('highlightfillcolor'), 1782 el.evalVisProp('highlightfillopacity') 1783 ); 1784 } else { 1785 this.setObjectStrokeColor( 1786 el, 1787 el.evalVisProp('highlightstrokecolor'), 1788 el.evalVisProp('highlightstrokeopacity') 1789 ); 1790 this.setObjectFillColor( 1791 el, 1792 el.evalVisProp('highlightfillcolor'), 1793 el.evalVisProp('highlightfillopacity') 1794 ); 1795 } 1796 } 1797 1798 // Highlight strokeWidth is suppressed if 1799 // parameter suppressHighlightStrokeWidth is false or undefined. 1800 // suppressHighlightStrokeWidth is false if polygon attribute 1801 // highlightbystrokewidth is true. 1802 if (!suppressHighlightStrokeWidth && el.evalVisProp('highlightstrokewidth')) { 1803 sw = Math.max( 1804 el.evalVisProp('highlightstrokewidth'), 1805 el.evalVisProp('strokewidth') 1806 ); 1807 this.setObjectStrokeWidth(el, sw); 1808 if ( 1809 el.elementClass === Const.OBJECT_CLASS_LINE || 1810 el.elementClass === Const.OBJECT_CLASS_CURVE 1811 ) { 1812 this.updatePathWithArrowHeads(el, true); 1813 } 1814 } 1815 } 1816 this.setCssClass(el, el.evalVisProp('highlightcssclass')); 1817 1818 return this; 1819 }, 1820 1821 /** 1822 * Uses the normal colors of an object, i.e. the opposite of {@link JXG.AbstractRenderer#highlight}. 1823 * @param {JXG.GeometryElement} el Reference of the object that will get its normal colors. 1824 * @returns {JXG.AbstractRenderer} Reference to the renderer 1825 * @see JXG.AbstractRenderer#updateTextStyle 1826 */ 1827 noHighlight: function (el) { 1828 var i, sw; 1829 1830 this.setObjectTransition(el); 1831 if (!el.evalVisProp('draft')) { 1832 if (el.type === Const.OBJECT_TYPE_POLYGON) { 1833 this.setObjectFillColor(el, el.evalVisProp('fillcolor'), el.evalVisProp('fillopacity')); 1834 for (i = 0; i < el.borders.length; i++) { 1835 this.noHighlight(el.borders[i]); 1836 } 1837 } else { 1838 if (el.elementClass === Const.OBJECT_CLASS_TEXT) { 1839 this.updateTextStyle(el, false); 1840 } else if (el.type === Const.OBJECT_TYPE_IMAGE) { 1841 this.updateImageStyle(el, false); 1842 this.setObjectFillColor(el, el.evalVisProp('fillcolor'), el.evalVisProp('fillopacity')); 1843 } else { 1844 this.setObjectStrokeColor(el, el.evalVisProp('strokecolor'), el.evalVisProp('strokeopacity')); 1845 this.setObjectFillColor(el, el.evalVisProp('fillcolor'), el.evalVisProp('fillopacity')); 1846 } 1847 } 1848 1849 sw = el.evalVisProp('strokewidth'); 1850 this.setObjectStrokeWidth(el, sw); 1851 if ( 1852 el.elementClass === Const.OBJECT_CLASS_LINE || 1853 el.elementClass === Const.OBJECT_CLASS_CURVE 1854 ) { 1855 this.updatePathWithArrowHeads(el, false); 1856 } 1857 } 1858 this.setCssClass(el, el.evalVisProp('cssclass')); 1859 1860 return this; 1861 }, 1862 1863 /** 1864 * Puts an object from draft mode back into normal mode. 1865 * @param {JXG.GeometryElement} el Reference of the object that no longer is in draft mode. 1866 */ 1867 removeDraft: function (el) { 1868 this.setObjectTransition(el); 1869 if (el.type === Const.OBJECT_TYPE_POLYGON) { 1870 this.setObjectFillColor(el, el.evalVisProp('fillcolor'), el.evalVisProp('fillopacity')); 1871 } else { 1872 if (el.type === Const.OBJECT_CLASS_POINT) { 1873 this.setObjectFillColor(el, el.evalVisProp('fillcolor'), el.evalVisProp('fillopacity')); 1874 } 1875 this.setObjectStrokeColor(el, el.evalVisProp('strokecolor'), el.evalVisProp('strokeopacity')); 1876 this.setObjectStrokeWidth(el, el.evalVisProp('strokewidth')); 1877 } 1878 }, 1879 1880 /** 1881 * Set ARIA related properties of an element. The attribute "aria" of an element contains at least the 1882 * properties "enabled", "label", and "live". Additionally, all available properties from 1883 * {@link https://developer.mozilla.org/en-US/docs/Web/Accessibility/ARIA} may be set. 1884 * <p> 1885 * In JSXGraph, the available properties are used without the leading 'aria-'. 1886 * For example, the value of the JSXGraph attribute 'aria.label' will be set to the 1887 * HTML attribute 'aria-label'. 1888 * 1889 * @param {JXG.GeometryElement} el Reference of the object that wants new 1890 * ARIA attributes. 1891 */ 1892 setARIA: function(el) { /* stub */ }, 1893 1894 /** 1895 * Sets the buffering as recommended by SVGWG. Until now only Opera supports this and will be ignored by other 1896 * browsers. Although this feature is only supported by SVG we have this method in {@link JXG.AbstractRenderer} 1897 * because it is called from outside the renderer. 1898 * @param {Node} node The SVG DOM Node which buffering type to update. 1899 * @param {String} type Either 'auto', 'dynamic', or 'static'. For an explanation see 1900 * {@link https://www.w3.org/TR/SVGTiny12/painting.html#BufferedRenderingProperty}. 1901 */ 1902 setBuffering: function (node, type) { /* stub */ }, 1903 1904 /** 1905 * Sets CSS classes for elements (relevant for SVG only). 1906 * 1907 * @param {JXG.GeometryElement} el Reference of the object that wants a 1908 * new set of CSS classes. 1909 * @param {String} cssClass String containing a space separated list of CSS classes. 1910 */ 1911 setCssClass: function (el, cssClass) { /* stub */ }, 1912 1913 /** 1914 * Sets an element's dash style. 1915 * @param {JXG.GeometryElement} el An JSXGraph element. 1916 */ 1917 setDashStyle: function (el) { /* stub */ }, 1918 1919 /** 1920 * Puts an object into draft mode, i.e. it's visual appearance will be changed. For GEONE<sub>x</sub>T backwards 1921 * compatibility. 1922 * @param {JXG.GeometryElement} el Reference of the object that is in draft mode. 1923 */ 1924 setDraft: function (el) { 1925 if (!el.evalVisProp('draft')) { 1926 return; 1927 } 1928 var draftColor = el.board.options.elements.draft.color, 1929 draftOpacity = el.board.options.elements.draft.opacity; 1930 1931 this.setObjectTransition(el); 1932 if (el.type === Const.OBJECT_TYPE_POLYGON) { 1933 this.setObjectFillColor(el, draftColor, draftOpacity); 1934 } else { 1935 if (el.elementClass === Const.OBJECT_CLASS_POINT) { 1936 this.setObjectFillColor(el, draftColor, draftOpacity); 1937 } else { 1938 this.setObjectFillColor(el, "none", 0); 1939 } 1940 this.setObjectStrokeColor(el, draftColor, draftOpacity); 1941 this.setObjectStrokeWidth(el, el.board.options.elements.draft.strokeWidth); 1942 } 1943 }, 1944 1945 /** 1946 * Sets up nodes for rendering a gradient fill. 1947 * @param {JXG.GeometryElement} el Reference of the object which gets the gradient 1948 */ 1949 setGradient: function (el) { /* stub */ }, 1950 1951 /** 1952 * Move element into new layer. This is trivial for canvas, but needs more effort in SVG. 1953 * Does not work dynamically, i.e. if level is a function. 1954 * 1955 * @param {JXG.GeometryElement} el Element which is put into different layer 1956 * @param {Number} value Layer number 1957 * @private 1958 */ 1959 setLayer: function (el, level) { /* stub */ }, 1960 1961 /** 1962 * Sets an objects fill color. 1963 * @param {JXG.GeometryElement} el Reference of the object that wants a new fill color. 1964 * @param {String} color Color in a HTML/CSS compatible format. If you don't want any fill color at all, choose 1965 * 'none'. 1966 * @param {Number} opacity Opacity of the fill color. Must be between 0 and 1. 1967 */ 1968 setObjectFillColor: function (el, color, opacity) { /* stub */ }, 1969 1970 /** 1971 * Changes an objects stroke color to the given color. 1972 * @param {JXG.GeometryElement} el Reference of the {@link JXG.GeometryElement} that gets a new stroke 1973 * color. 1974 * @param {String} color Color value in a HTML compatible format, e.g. <strong>#00ff00</strong> or 1975 * <strong>green</strong> for green. 1976 * @param {Number} opacity Opacity of the fill color. Must be between 0 and 1. 1977 */ 1978 setObjectStrokeColor: function (el, color, opacity) { /* stub */ }, 1979 1980 /** 1981 * Sets an element's stroke width. 1982 * @param {JXG.GeometryElement} el Reference to the geometry element. 1983 * @param {Number} width The new stroke width to be assigned to the element. 1984 */ 1985 setObjectStrokeWidth: function (el, width) { /* stub */ }, 1986 1987 /** 1988 * Sets the transition duration (in milliseconds) for fill color and stroke 1989 * color and opacity. 1990 * @param {JXG.GeometryElement} el Reference of the object that wants a 1991 * new transition duration. 1992 * @param {Number} duration (Optional) duration in milliseconds. If not given, 1993 * element.visProp.transitionDuration is taken. This is the default. 1994 */ 1995 setObjectTransition: function (el, duration) { /* stub */ }, 1996 1997 /** 1998 * Sets a node's attribute. 1999 * @param {Node} node The node that is to be updated. 2000 * @param {String} key Name of the attribute. 2001 * @param {String} val New value for the attribute. 2002 */ 2003 setPropertyPrim: function (node, key, val) { /* stub */ }, 2004 2005 /** 2006 * Sets the shadow properties to a geometry element. This method is only a stub, it is implemented in the actual 2007 * renderers. 2008 * @param {JXG.GeometryElement} el Reference to a geometry object, that should get a shadow 2009 */ 2010 setShadow: function (el) { /* stub */ }, 2011 2012 /** 2013 * Set the attribute `tabindex` to the attribute `tabindex` of an element. 2014 * This is only relevant for the SVG renderer. 2015 * 2016 * @param {JXG.GeometryElement} el 2017 */ 2018 setTabindex: function (el) { /* stub */ }, 2019 2020 /** 2021 * Shows a hidden element on the canvas; Only a stub, requires implementation in the derived renderer. 2022 * 2023 * Please use JXG.AbstractRenderer#display instead 2024 * @param {JXG.GeometryElement} el Reference to the object that has to appear. 2025 * @see JXG.AbstractRenderer#hide 2026 * @deprecated 2027 */ 2028 show: function (el) { /* stub */ }, 2029 2030 /** 2031 * Updates the gradient fill. 2032 * @param {JXG.GeometryElement} el An JSXGraph element with an area that can be filled. 2033 */ 2034 updateGradient: function (el) { /* stub */ }, 2035 2036 /* ********* Renderer control *********** */ 2037 2038 /** 2039 * Stop redraw. This method is called before every update, so a non-vector-graphics based renderer can use this 2040 * method to delete the contents of the drawing panel. This is an abstract method every descendant renderer 2041 * should implement, if appropriate. 2042 * @see JXG.AbstractRenderer#unsuspendRedraw 2043 */ 2044 suspendRedraw: function () { /* stub */ }, 2045 2046 /** 2047 * Restart redraw. This method is called after updating all the rendering node attributes. 2048 * @see JXG.AbstractRenderer#suspendRedraw 2049 */ 2050 unsuspendRedraw: function () { /* stub */ }, 2051 2052 /** 2053 * The tiny zoom bar shown on the bottom of a board (if board attribute "showNavigation" is true). 2054 * It is a div element and gets the CSS class "JXG_navigation" and the id {board id}_navigationbar. 2055 * <p> 2056 * The buttons get the CSS class "JXG_navigation_button" and the id {board_id}_name where name is 2057 * one of [top, down, left, right, out, 100, in, fullscreen, screenshot, reload, cleartraces]. 2058 * <p> 2059 * The symbols for zoom, navigation and reload are hard-coded. 2060 * 2061 * @param {JXG.Board} board Reference to a JSXGraph board. 2062 * @param {Object} attr Attributes of the navigation bar 2063 * @private 2064 */ 2065 drawNavigationBar: function (board, attr) { 2066 var doc, 2067 node, 2068 cancelbubble = function (e) { 2069 if (!e) { 2070 e = window.event; 2071 } 2072 2073 if (e.stopPropagation) { 2074 // Non IE<=8 2075 e.stopPropagation(); 2076 } else { 2077 e.cancelBubble = true; 2078 } 2079 }, 2080 createButton = function (label, handler, board_id, type) { 2081 var button; 2082 2083 board_id = board_id || ""; 2084 2085 button = doc.createElement("span"); 2086 button.innerHTML = label; // button.appendChild(doc.createTextNode(label)); 2087 2088 // Style settings are superseded by adding the CSS class below 2089 button.style.paddingLeft = "7px"; 2090 button.style.paddingRight = "7px"; 2091 2092 if (button.classList !== undefined) { 2093 // classList not available in IE 9 2094 button.classList.add("JXG_navigation_button"); 2095 button.classList.add("JXG_navigation_button_" + type); 2096 } 2097 // button.setAttribute('tabindex', 0); 2098 2099 button.setAttribute("id", board_id + '_navigation_' + type); 2100 button.setAttribute("aria-hidden", 'true'); // navigation buttons should never appear in screen reader 2101 2102 node.appendChild(button); 2103 2104 Env.addEvent( 2105 button, 2106 "click", 2107 function (e) { 2108 Type.bind(handler, board)(); 2109 return false; 2110 }, 2111 board 2112 ); 2113 // prevent the click from bubbling down to the board 2114 Env.addEvent(button, "pointerup", cancelbubble, board); 2115 Env.addEvent(button, "pointerdown", cancelbubble, board); 2116 Env.addEvent(button, "pointerleave", cancelbubble, board); 2117 Env.addEvent(button, "mouseup", cancelbubble, board); 2118 Env.addEvent(button, "mousedown", cancelbubble, board); 2119 Env.addEvent(button, "touchend", cancelbubble, board); 2120 Env.addEvent(button, "touchstart", cancelbubble, board); 2121 }; 2122 2123 if (Env.isBrowser && this.type !== "no") { 2124 doc = board.containerObj.ownerDocument; 2125 node = doc.createElement("div"); 2126 2127 node.setAttribute("id", board.container + "_navigationbar"); 2128 2129 // Style settings are superseded by adding the CSS class below 2130 node.style.color = attr.strokecolor; 2131 node.style.backgroundColor = attr.fillcolor; 2132 node.style.padding = attr.padding; 2133 node.style.position = attr.position; 2134 node.style.fontSize = attr.fontsize; 2135 node.style.cursor = attr.cursor; 2136 node.style.zIndex = attr.zindex; 2137 board.containerObj.appendChild(node); 2138 node.style.right = attr.right; 2139 node.style.bottom = attr.bottom; 2140 2141 if (node.classList !== undefined) { 2142 // classList not available in IE 9 2143 node.classList.add("JXG_navigation"); 2144 } 2145 // For XHTML we need unicode instead of HTML entities 2146 2147 if (board.attr.showfullscreen) { 2148 createButton( 2149 board.attr.fullscreen.symbol, 2150 function () { 2151 board.toFullscreen(board.attr.fullscreen.id); 2152 }, 2153 board.container, "fullscreen" 2154 ); 2155 } 2156 2157 if (board.attr.showscreenshot) { 2158 createButton( 2159 board.attr.screenshot.symbol, 2160 function () { 2161 window.setTimeout(function () { 2162 board.renderer.screenshot(board, "", false); 2163 }, 330); 2164 }, 2165 board.container, "screenshot" 2166 ); 2167 } 2168 2169 if (board.attr.showreload) { 2170 // full reload circle: \u27F2 2171 // the board.reload() method does not exist during the creation 2172 // of this button. That's why this anonymous function wrapper is required. 2173 createButton( 2174 "\u21BB", 2175 function () { 2176 board.reload(); 2177 }, 2178 board.container, "reload" 2179 ); 2180 } 2181 2182 if (board.attr.showcleartraces) { 2183 // clear traces symbol (otimes): \u27F2 2184 createButton("\u2297", 2185 function () { 2186 board.clearTraces(); 2187 }, 2188 board.container, "cleartraces" 2189 ); 2190 } 2191 2192 if (board.attr.shownavigation) { 2193 if (board.attr.showzoom) { 2194 createButton("\u2013", board.zoomOut, board.container, "out"); 2195 createButton("o", board.zoom100, board.container, "100"); 2196 createButton("+", board.zoomIn, board.container, "in"); 2197 } 2198 createButton("\u2190", board.clickLeftArrow, board.container, "left"); 2199 createButton("\u2193", board.clickUpArrow, board.container, "down"); // Down arrow 2200 createButton("\u2191", board.clickDownArrow, board.container, "up"); // Up arrow 2201 createButton("\u2192", board.clickRightArrow, board.container, "right"); 2202 } 2203 } 2204 }, 2205 2206 /** 2207 * Wrapper for getElementById for maybe other renderers which elements are not directly accessible by DOM 2208 * methods like document.getElementById(). 2209 * @param {String} id Unique identifier for element. 2210 * @returns {Object} Reference to a JavaScript object. In case of SVG/VMLRenderer it's a reference to a SVG/VML node. 2211 */ 2212 getElementById: function (id) { 2213 var str; 2214 if (Type.exists(this.container)) { 2215 // Use querySelector over getElementById for compatibility with both 'regular' document 2216 // and ShadowDOM fragments. 2217 str = this.container.id + '_' + id; 2218 // Mask special symbols like '/' and '\' in id 2219 if (Type.exists(CSS) && Type.exists(CSS.escape)) { 2220 str = CSS.escape(str); 2221 } 2222 return this.container.querySelector('#' + str); 2223 } 2224 return ""; 2225 }, 2226 2227 /** 2228 * Remove an element and provide a function that inserts it into its original position. This method 2229 * is taken from this article {@link https://developers.google.com/speed/articles/javascript-dom}. 2230 * @author KeeKim Heng, Google Web Developer 2231 * @param {Element} el The element to be temporarily removed 2232 * @returns {Function} A function that inserts the element into its original position 2233 */ 2234 removeToInsertLater: function (el) { 2235 var parentNode = el.parentNode, 2236 nextSibling = el.nextSibling; 2237 2238 if (parentNode === null) { 2239 return; 2240 } 2241 parentNode.removeChild(el); 2242 2243 return function () { 2244 if (nextSibling) { 2245 parentNode.insertBefore(el, nextSibling); 2246 } else { 2247 parentNode.appendChild(el); 2248 } 2249 }; 2250 }, 2251 2252 /** 2253 * Resizes the rendering element 2254 * @param {Number} w New width 2255 * @param {Number} h New height 2256 */ 2257 resize: function (w, h) { /* stub */ }, 2258 2259 /** 2260 * Create crosshair elements (Fadenkreuz) for presentations. 2261 * @param {Number} n Number of crosshairs. 2262 */ 2263 createTouchpoints: function (n) { /* stub */ }, 2264 2265 /** 2266 * Show a specific crosshair. 2267 * @param {Number} i Number of the crosshair to show 2268 */ 2269 showTouchpoint: function (i) { /* stub */ }, 2270 2271 /** 2272 * Hide a specific crosshair. 2273 * @param {Number} i Number of the crosshair to show 2274 */ 2275 hideTouchpoint: function (i) { /* stub */ }, 2276 2277 /** 2278 * Move a specific crosshair. 2279 * @param {Number} i Number of the crosshair to show 2280 * @param {Array} pos New positon in screen coordinates 2281 */ 2282 updateTouchpoint: function (i, pos) { /* stub */ }, 2283 2284 /* ********* Dump related stuff *********** */ 2285 2286 /** 2287 * Convert SVG construction to base64 encoded SVG data URL. 2288 * Only available on SVGRenderer. 2289 * 2290 * @see JXG.SVGRenderer#dumpToDataURI 2291 */ 2292 dumpToDataURI: function (_ignoreTexts) { /* stub */ }, 2293 2294 /** 2295 * Convert SVG construction to canvas. 2296 * Only available on SVGRenderer. 2297 * 2298 * @see JXG.SVGRenderer#dumpToCanvas 2299 */ 2300 dumpToCanvas: function (canvasId, w, h, _ignoreTexts) { /* stub */ }, 2301 2302 /** 2303 * Display SVG image in html img-tag which enables 2304 * easy download for the user. 2305 * 2306 * See JXG.SVGRenderer#screenshot 2307 */ 2308 screenshot: function (board) { /* stub */ } 2309 2310 } 2311 ); 2312 2313 export default JXG.AbstractRenderer; 2314