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, window: true*/
 33 /*jslint nomen: true, plusplus: true*/
 34 
 35 /**
 36  * @fileoverview In this file the Text element is defined.
 37  */
 38 
 39 import JXG from "../jxg.js";
 40 import Const from "./constants.js";
 41 import GeometryElement from "./element.js";
 42 import GeonextParser from "../parser/geonext.js";
 43 import Env from "../utils/env.js";
 44 import Type from "../utils/type.js";
 45 import Mat from "../math/math.js";
 46 import CoordsElement from "./coordselement.js";
 47 
 48 var priv = {
 49     /**
 50      * @class
 51      * @ignore
 52      */
 53     HTMLSliderInputEventHandler: function () {
 54         this._val = parseFloat(this.rendNodeRange.value);
 55         this.rendNodeOut.value = this.rendNodeRange.value;
 56         this.board.update();
 57     }
 58 };
 59 
 60 /**
 61  * Construct and handle texts.
 62  *
 63  * The coordinates can be relative to the coordinates of an element
 64  * given in {@link JXG.Options#text.anchor}.
 65  *
 66  * MathJax, HTML and GEONExT syntax can be handled.
 67  * @class Creates a new text object. Do not use this constructor to create a text. Use {@link JXG.Board#create} with
 68  * type {@link Text} instead.
 69  * @augments JXG.GeometryElement
 70  * @augments JXG.CoordsElement
 71  * @param {string|JXG.Board} board The board the new text is drawn on.
 72  * @param {Array} coordinates An array with the user coordinates of the text.
 73  * @param {Object} attributes An object containing visual properties and optional a name and a id.
 74  * @param {string|function} content A string or a function returning a string.
 75  *
 76  */
 77 JXG.Text = function (board, coords, attributes, content) {
 78     var tmp;
 79 
 80     this.constructor(board, attributes, Const.OBJECT_TYPE_TEXT, Const.OBJECT_CLASS_TEXT);
 81 
 82     this.element = this.board.select(attributes.anchor);
 83     this.coordsConstructor(coords, this.evalVisProp('islabel'));
 84 
 85     this.content = "";
 86     this.plaintext = "";
 87     this.plaintextOld = null;
 88     this.orgText = "";
 89 
 90     this.needsSizeUpdate = false;
 91     // Only used by infobox anymore
 92     this.hiddenByParent = false;
 93 
 94     /**
 95      * Width and height of the text element in pixel.
 96      *
 97      * @private
 98      * @type Array
 99      */
100     this.size = [1.0, 1.0];
101     this.id = this.board.setId(this, "T");
102 
103     this.board.renderer.drawText(this);
104     this.board.finalizeAdding(this);
105 
106     // Set text before drawing
107     // this._createFctUpdateText(content);
108     // this.updateText();
109 
110     // Set attribute visible to true. This is necessary to
111     // create all sub-elements for button, input and checkbox
112     tmp = this.visProp.visible;
113     this.visProp.visible = true;
114     this.setText(content);
115     // Restore the correct attribute visible.
116     this.visProp.visible = tmp;
117 
118     if (Type.isString(this.content)) {
119         this.notifyParents(this.content);
120     }
121     this.elType = "text";
122 
123     this.methodMap = Type.deepCopy(this.methodMap, {
124         setText: "setTextJessieCode",
125         // free: 'free',
126         move: "setCoords",
127         Size: "getSize",
128         setAutoPosition: "setAutoPosition"
129     });
130 };
131 
132 JXG.Text.prototype = new GeometryElement();
133 Type.copyPrototypeMethods(JXG.Text, CoordsElement, "coordsConstructor");
134 
135 JXG.extend(
136     JXG.Text.prototype,
137     /** @lends JXG.Text.prototype */ {
138         /**
139          * @private
140          * @param {Number} x
141          * @param {Number} y
142          * @returns {Boolean}
143         */
144         // Test if the screen coordinates (x,y) are in a small stripe
145         // at the left side or at the right side of the text.
146         // Sensitivity is set in this.board.options.precision.hasPoint.
147         // If dragarea is set to 'all' (default), tests if the screen
148         // coordinates (x,y) are in within the text boundary.
149         hasPoint: function (x, y) {
150             var lft, rt, top, bot, ax, ay, type, r;
151 
152             if (Type.isObject(this.evalVisProp('precision'))) {
153                 type = this.board._inputDevice;
154                 r = this.evalVisProp('precision.' + type);
155             } else {
156                 // 'inherit'
157                 r = this.board.options.precision.hasPoint;
158             }
159             if (this.transformations.length > 0) {
160                 //Transform the mouse/touch coordinates
161                 // back to the original position of the text.
162                 lft = Mat.matVecMult(
163                     Mat.inverse(this.board.renderer.joinTransforms(this, this.transformations)),
164                     [1, x, y]
165                 );
166                 x = lft[1];
167                 y = lft[2];
168             }
169 
170             ax = this.getAnchorX();
171             if (ax === "right") {
172                 lft = this.coords.scrCoords[1] - this.size[0];
173             } else if (ax === "middle") {
174                 lft = this.coords.scrCoords[1] - 0.5 * this.size[0];
175             } else {
176                 lft = this.coords.scrCoords[1];
177             }
178             rt = lft + this.size[0];
179 
180             ay = this.getAnchorY();
181             if (ay === "top") {
182                 bot = this.coords.scrCoords[2] + this.size[1];
183             } else if (ay === "middle") {
184                 bot = this.coords.scrCoords[2] + 0.5 * this.size[1];
185             } else {
186                 bot = this.coords.scrCoords[2];
187             }
188             top = bot - this.size[1];
189 
190             if (this.evalVisProp('dragarea') === "all") {
191                 return x >= lft - r && x < rt + r && y >= top - r && y <= bot + r;
192             }
193             // e.g. 'small'
194             return (
195                 y >= top - r &&
196                 y <= bot + r &&
197                 ((x >= lft - r && x <= lft + 2 * r) || (x >= rt - 2 * r && x <= rt + r))
198             );
199         },
200 
201         /**
202          * This sets the updateText function of this element depending on the type of text content passed.
203          * Used by {@link JXG.Text#_setText}.
204          * @param {String|Function|Number} text
205          * @private
206          * @see JXG.Text#_setText
207          */
208         _createFctUpdateText: function (text) {
209             var updateText, e, digits,
210                 resolvedText,
211                 i, that,
212                 ev_p = this.evalVisProp('parse'),
213                 ev_um = this.evalVisProp('usemathjax'),
214                 ev_uk = this.evalVisProp('usekatex'),
215                 convertJessieCode = false;
216 
217             this.orgText = text;
218 
219             if (Type.isFunction(text)) {
220                 /**
221                  * Dynamically created function to update the content
222                  * of a text. Can not be overwritten.
223                  * <p>
224                  * <value> tags will not be evaluated if text is provided by a function
225                  * <p>
226                  * Sets the property <tt>plaintext</tt> of the text element.
227                  *
228                  * @private
229                  */
230                 this.updateText = function () {
231                     resolvedText = text().toString(); // Evaluate function
232                     if (ev_p && !ev_um && !ev_uk) {
233                         this.plaintext = this.replaceSub(
234                             this.replaceSup(
235                                 this.convertGeonextAndSketchometry2CSS(resolvedText, false)
236                             )
237                         );
238                     } else {
239                         this.plaintext = resolvedText;
240                     }
241                 };
242             } else {
243                 if (Type.isNumber(text) && this.evalVisProp('formatnumber')) {
244                     if (this.evalVisProp('tofraction')) {
245                         if (ev_um) {
246                             this.content = '\\(' + Type.toFraction(text, true) + '\\)';
247                         } else {
248                             this.content = Type.toFraction(text, ev_uk);
249                         }
250                     } else {
251                         digits = this.evalVisProp('digits');
252                         if (this.useLocale()) {
253                             this.content = this.formatNumberLocale(text, digits);
254                         } else {
255                             this.content = Type.toFixed(text, digits);
256                         }
257                     }
258                 } else if (Type.isString(text) && ev_p) {
259                     if (this.evalVisProp('useasciimathml')) {
260                         // ASCIIMathML
261                         // value-tags are not supported
262                         this.content = "'`" + text + "`'";
263                     } else if (ev_um || ev_uk) {
264                         // MathJax or KaTeX
265                         // Replace value-tags by functions
266                         // sketchofont is ignored
267                         this.content = this.valueTagToJessieCode(text);
268                         if (!Type.isArray(this.content)) {
269                             // For some reason we don't have to mask backslashes in an array of strings
270                             // anymore.
271                             //
272                             // for (i = 0; i < this.content.length; i++) {
273                             //     this.content[i] = this.content[i].replace(/\\/g, "\\\\"); // Replace single backslash by double
274                             // }
275                             // } else {
276                             this.content = this.content.replace(/\\/g, "\\\\"); // Replace single backslash by double
277                         }
278                     } else {
279                         // No TeX involved.
280                         // Converts GEONExT syntax into JavaScript string
281                         // Short math is allowed
282                         // Replace value-tags by functions
283                         // Avoid geonext2JS calls
284                         this.content = this.poorMansTeX(this.valueTagToJessieCode(text));
285                     }
286                     convertJessieCode = true;
287                 } else {
288                     this.content = text;
289                 }
290 
291                 // Generate function which returns the text to be displayed
292                 if (convertJessieCode) {
293                     // Convert JessieCode to JS function
294                     if (Type.isArray(this.content)) {
295                         // This is the case if the text contained value-tags.
296                         // These value-tags consist of JessieCode snippets
297                         // which are now replaced by JavaScript functions
298                         that = this;
299                         for (i = 0; i < this.content.length; i++) {
300                             if (this.content[i][0] !== '"') {
301                                 this.content[i] = this.board.jc.snippet(this.content[i], true, "", false);
302                                 for (e in this.content[i].deps) {
303                                     this.addParents(this.content[i].deps[e]);
304                                     this.content[i].deps[e].addChild(this);
305                                 }
306                             }
307                         }
308 
309                         updateText = function() {
310                             var i, t,
311                                 digits = that.evalVisProp('digits'),
312                                 txt = '';
313 
314                             for (i = 0; i < that.content.length; i++) {
315                                 if (Type.isFunction(that.content[i])) {
316                                     t = that.content[i]();
317                                     if (that.useLocale()) {
318                                         t = that.formatNumberLocale(t, digits);
319                                     } else {
320                                         t = Type.toFixed(t, digits);
321                                     }
322                                 } else {
323                                     t = that.content[i];
324                                     // Instead of 't.at(t.length - 1)' also 't.(-1)' should work.
325                                     // However in Moodle 4.2 't.(-1)' returns an empty string.
326                                     // In plain HTML pages it works.
327                                     if (t[0] === '"' && t[t.length - 1] === '"') {
328                                         t = t.slice(1, -1);
329                                     }
330                                 }
331 
332                                 txt += t;
333                             }
334                             return txt;
335                         };
336                     } else {
337                         updateText = this.board.jc.snippet(this.content, true, "", false);
338                         for (e in updateText.deps) {
339                             this.addParents(updateText.deps[e]);
340                             updateText.deps[e].addChild(this);
341                         }
342                     }
343 
344                     // Ticks have been escaped in valueTagToJessieCode
345                     this.updateText = function () {
346                         this.plaintext = this.unescapeTicks(updateText());
347                     };
348                 } else {
349                     this.updateText = function () {
350                         this.plaintext = this.content; // text;
351                     };
352                 }
353             }
354         },
355 
356         /**
357          * Defines new content. This is used by {@link JXG.Text#setTextJessieCode} and {@link JXG.Text#setText}. This is required because
358          * JessieCode needs to filter all Texts inserted into the DOM and thus has to replace setText by setTextJessieCode.
359          * @param {String|Function|Number} text
360          * @returns {JXG.Text}
361          * @private
362          */
363         _setText: function (text) {
364             this._createFctUpdateText(text);
365 
366             // First evaluation of the string.
367             // We need this for display='internal' and Canvas
368             this.updateText();
369             this.fullUpdate();
370 
371             // We do not call updateSize for the infobox to speed up rendering
372             if (!this.board.infobox || this.id !== this.board.infobox.id) {
373                 this.updateSize(); // updateSize() is called at least once.
374             }
375 
376             // This may slow down canvas renderer
377             // if (this.board.renderer.type === 'canvas') {
378             //     this.board.fullUpdate();
379             // }
380 
381             return this;
382         },
383 
384         /**
385          * Defines new content but converts < and > to HTML entities before updating the DOM.
386          * @param {String|function} text
387          */
388         setTextJessieCode: function (text) {
389             var s;
390 
391             this.visProp.castext = text;
392             if (Type.isFunction(text)) {
393                 s = function () {
394                     return Type.sanitizeHTML(text());
395                 };
396             } else {
397                 if (Type.isNumber(text)) {
398                     s = text;
399                 } else {
400                     s = Type.sanitizeHTML(text);
401                 }
402             }
403 
404             return this._setText(s);
405         },
406 
407         /**
408          * Defines new content.
409          * @param {String|function} text
410          * @returns {JXG.Text} Reference to the text object.
411          */
412         setText: function (text) {
413             return this._setText(text);
414         },
415 
416         /**
417          * Recompute the width and the height of the text box.
418          * Updates the array {@link JXG.Text#size} with pixel values.
419          * The result may differ from browser to browser
420          * by some pixels.
421          * In canvas an old IEs we use a very crude estimation of the dimensions of
422          * the textbox.
423          * JSXGraph needs {@link JXG.Text#size} for applying rotations in IE and
424          * for aligning text.
425          *
426          * @return {this} [description]
427          */
428         updateSize: function () {
429             var tmp,
430                 that,
431                 node,
432                 ev_d = this.evalVisProp('display');
433 
434             if (!Env.isBrowser || this.board.renderer.type === "no") {
435                 return this;
436             }
437             node = this.rendNode;
438 
439             /**
440              * offsetWidth and offsetHeight seem to be supported for internal vml elements by IE10+ in IE8 mode.
441              */
442             if (ev_d === "html" || this.board.renderer.type === "vml") {
443                 if (Type.exists(node.offsetWidth)) {
444                     that = this;
445                     window.setTimeout(function () {
446                         that.size = [node.offsetWidth, node.offsetHeight];
447                         that.needsUpdate = true;
448                         that.updateRenderer();
449                     }, 0);
450                     // In case, there is non-zero padding or borders
451                     // the following approach does not longer work.
452                     // s = [node.offsetWidth, node.offsetHeight];
453                     // if (s[0] === 0 && s[1] === 0) { // Some browsers need some time to set offsetWidth and offsetHeight
454                     //     that = this;
455                     //     window.setTimeout(function () {
456                     //         that.size = [node.offsetWidth, node.offsetHeight];
457                     //         that.needsUpdate = true;
458                     //         that.updateRenderer();
459                     //     }, 0);
460                     // } else {
461                     //     this.size = s;
462                     // }
463                 } else {
464                     this.size = this.crudeSizeEstimate();
465                 }
466             } else if (ev_d === "internal") {
467                 if (this.board.renderer.type === "svg") {
468                     that = this;
469                     window.setTimeout(function () {
470                         try {
471                             tmp = node.getBBox();
472                             that.size = [tmp.width, tmp.height];
473                             that.needsUpdate = true;
474                             that.updateRenderer();
475                         } catch (e) {}
476                     }, 0);
477                 } else if (this.board.renderer.type === "canvas") {
478                     this.size = this.crudeSizeEstimate();
479                 }
480             }
481 
482             return this;
483         },
484 
485         /**
486          * A very crude estimation of the dimensions of the textbox in case nothing else is available.
487          * @returns {Array}
488          */
489         crudeSizeEstimate: function () {
490             var ev_fs = parseFloat(this.evalVisProp('fontsize'));
491             return [ev_fs * this.plaintext.length * 0.45, ev_fs * 0.9];
492         },
493 
494         /**
495          * Decode unicode entities into characters.
496          * @param {String} string
497          * @returns {String}
498          */
499         utf8_decode: function (string) {
500             return string.replace(/&#x(\w+);/g, function (m, p1) {
501                 return String.fromCharCode(parseInt(p1, 16));
502             });
503         },
504 
505         /**
506          * Replace _{} by <sub>
507          * @param {String} te String containing _{}.
508          * @returns {String} Given string with _{} replaced by <sub>.
509          */
510         replaceSub: function (te) {
511             if (!te.indexOf) {
512                 return te;
513             }
514 
515             var j,
516                 i = te.indexOf("_{");
517 
518             // The regexp in here are not used for filtering but to provide some kind of sugar for label creation,
519             // i.e. replacing _{...} with <sub>...</sub>. What is passed would get out anyway.
520             /*jslint regexp: true*/
521             while (i >= 0) {
522                 te = te.slice(0, i) + te.slice(i).replace(/_\{/, "<sub>");
523                 j = te.indexOf("}", i + 4);
524                 if (j >= 0) {
525                     te = te.slice(0, j) + te.slice(j).replace(/\}/, "</sub>");
526                 }
527                 i = te.indexOf("_{");
528             }
529 
530             i = te.indexOf("_");
531             while (i >= 0) {
532                 te = te.slice(0, i) + te.slice(i).replace(/_(.?)/, "<sub>$1</sub>");
533                 i = te.indexOf("_");
534             }
535 
536             return te;
537         },
538 
539         /**
540          * Replace ^{} by <sup>
541          * @param {String} te String containing ^{}.
542          * @returns {String} Given string with ^{} replaced by <sup>.
543          */
544         replaceSup: function (te) {
545             if (!te.indexOf) {
546                 return te;
547             }
548 
549             var j,
550                 i = te.indexOf("^{");
551 
552             // The regexp in here are not used for filtering but to provide some kind of sugar for label creation,
553             // i.e. replacing ^{...} with <sup>...</sup>. What is passed would get out anyway.
554             /*jslint regexp: true*/
555             while (i >= 0) {
556                 te = te.slice(0, i) + te.slice(i).replace(/\^\{/, "<sup>");
557                 j = te.indexOf("}", i + 4);
558                 if (j >= 0) {
559                     te = te.slice(0, j) + te.slice(j).replace(/\}/, "</sup>");
560                 }
561                 i = te.indexOf("^{");
562             }
563 
564             i = te.indexOf("^");
565             while (i >= 0) {
566                 te = te.slice(0, i) + te.slice(i).replace(/\^(.?)/, "<sup>$1</sup>");
567                 i = te.indexOf("^");
568             }
569 
570             return te;
571         },
572 
573         /**
574          * Return the width of the text element.
575          * @returns {Array} [width, height] in pixel
576          */
577         getSize: function () {
578             return this.size;
579         },
580 
581         /**
582          * Move the text to new coordinates.
583          * @param {number} x
584          * @param {number} y
585          * @returns {object} reference to the text object.
586          */
587         setCoords: function (x, y) {
588             var coordsAnchor, dx, dy;
589             if (Type.isArray(x) && x.length > 1) {
590                 y = x[1];
591                 x = x[0];
592             }
593 
594             if (this.evalVisProp('islabel') && Type.exists(this.element)) {
595                 coordsAnchor = this.element.getLabelAnchor();
596                 dx = (x - coordsAnchor.usrCoords[1]) * this.board.unitX;
597                 dy = -(y - coordsAnchor.usrCoords[2]) * this.board.unitY;
598 
599                 this.relativeCoords.setCoordinates(Const.COORDS_BY_SCREEN, [dx, dy]);
600             } else {
601                 this.coords.setCoordinates(Const.COORDS_BY_USER, [x, y]);
602             }
603 
604             // this should be a local update, otherwise there might be problems
605             // with the tick update routine resulting in orphaned tick labels
606             this.fullUpdate();
607 
608             return this;
609         },
610 
611         /**
612          * Evaluates the text.
613          * Then, the update function of the renderer
614          * is called.
615          */
616         update: function (fromParent) {
617             if (!this.needsUpdate) {
618                 return this;
619             }
620 
621             this.updateCoords(fromParent);
622             this.updateText();
623 
624             if (this.evalVisProp('display') === "internal") {
625                 if (Type.isString(this.plaintext)) {
626                     this.plaintext = this.utf8_decode(this.plaintext);
627                 }
628             }
629 
630             this.checkForSizeUpdate();
631             if (this.needsSizeUpdate) {
632                 this.updateSize();
633             }
634 
635             return this;
636         },
637 
638         /**
639          * Used to save updateSize() calls.
640          * Called in JXG.Text.update
641          * That means this.update() has been called.
642          * More tests are in JXG.Renderer.updateTextStyle. The latter tests
643          * are one update off. But this should pose not too many problems, since
644          * it affects fontSize and cssClass changes.
645          *
646          * @private
647          */
648         checkForSizeUpdate: function () {
649             if (this.board.infobox && this.id === this.board.infobox.id) {
650                 this.needsSizeUpdate = false;
651             } else {
652                 // For some magic reason it is more efficient on the iPad to
653                 // call updateSize() for EVERY text element EVERY time.
654                 this.needsSizeUpdate = this.plaintextOld !== this.plaintext;
655 
656                 if (this.needsSizeUpdate) {
657                     this.plaintextOld = this.plaintext;
658                 }
659             }
660         },
661 
662         /**
663          * The update function of the renderer
664          * is called.
665          * @private
666          */
667         updateRenderer: function () {
668             if (
669                 //this.board.updateQuality === this.board.BOARD_QUALITY_HIGH &&
670                 this.evalVisProp('autoposition')
671             ) {
672                 this.setAutoPosition().updateConstraint();
673             }
674             return this.updateRendererGeneric("updateText");
675         },
676 
677         /**
678          * Converts shortened math syntax into correct syntax:  3x instead of 3*x or
679          * (a+b)(3+1) instead of (a+b)*(3+1).
680          *
681          * @private
682          * @param{String} expr Math term
683          * @returns {string} expanded String
684          */
685         expandShortMath: function (expr) {
686             var re = /([)0-9.])\s*([(a-zA-Z_])/g;
687             return expr.replace(re, "$1*$2");
688         },
689 
690         /**
691          * Converts the GEONExT syntax of the <value> terms into JavaScript.
692          * Also, all Objects whose name appears in the term are searched and
693          * the text is added as child to these objects.
694          * This method is called if the attribute parse==true is set.
695          *
696          * Obsolete, replaced by JXG.Text.valueTagToJessieCode
697          *
698          * @param{String} contentStr String to be parsed
699          * @param{Boolean} [expand] Optional flag if shortened math syntax is allowed (e.g. 3x instead of 3*x).
700          * @param{Boolean} [avoidGeonext2JS] Optional flag if geonext2JS should be called. For backwards compatibility
701          * this has to be set explicitly to true.
702          * @param{Boolean} [outputTeX] Optional flag which has to be true if the resulting term will be sent to MathJax or KaTeX.
703          * If true, "_" and "^" are NOT replaced by HTML tags sub and sup. Default: false, i.e. the replacement is done.
704          * This flag allows the combination of <value> tag containing calculations with TeX output.
705          *
706          * @deprecated
707          * @private
708          * @see JXG.GeonextParser#geonext2JS
709          * @see JXG.Text#valueTagToJessieCode
710          *
711          */
712         generateTerm: function (contentStr, expand, avoidGeonext2JS) {
713             var res,
714                 term,
715                 i,
716                 j,
717                 plaintext = '""';
718 
719             // Revert possible jc replacement
720             contentStr = contentStr || "";
721             contentStr = contentStr.replace(/\r/g, "");
722             contentStr = contentStr.replace(/\n/g, "");
723             contentStr = contentStr.replace(/"/g, "'");
724             contentStr = contentStr.replace(/'/g, "\\'");
725 
726             // Old GEONExT syntax, not (yet) supported as TeX output.
727             // Otherwise, the else clause should be used.
728             // That means, i.e. the <arc> tag and <sqrt> tag are not
729             // converted into TeX syntax.
730             contentStr = contentStr.replace(/&arc;/g, "∠");
731             contentStr = contentStr.replace(/<arc\s*\/>/g, "∠");
732             contentStr = contentStr.replace(/<arc\s*\/>/g, "∠");
733             contentStr = contentStr.replace(/<sqrt\s*\/>/g, "√");
734 
735             contentStr = contentStr.replace(/<value>/g, "<value>");
736             contentStr = contentStr.replace(/<\/value>/g, "</value>");
737 
738             // Convert GEONExT syntax into  JavaScript syntax
739             i = contentStr.indexOf("<value>");
740             j = contentStr.indexOf("</value>");
741             if (i >= 0) {
742                 while (i >= 0) {
743                     plaintext +=
744                         ' + "' + this.replaceSub(this.replaceSup(contentStr.slice(0, i))) + '"';
745                     // plaintext += ' + "' + this.replaceSub(contentStr.slice(0, i)) + '"';
746 
747                     term = contentStr.slice(i + 7, j);
748                     term = term.replace(/\s+/g, ""); // Remove all whitespace
749                     if (expand === true) {
750                         term = this.expandShortMath(term);
751                     }
752                     if (avoidGeonext2JS) {
753                         res = term;
754                     } else {
755                         res = GeonextParser.geonext2JS(term, this.board);
756                     }
757                     res = res.replace(/\\"/g, "'");
758                     res = res.replace(/\\'/g, "'");
759 
760                     // GEONExT-Hack: apply rounding once only.
761                     if (res.indexOf("toFixed") < 0) {
762                         // output of a value tag
763                         if (
764                             Type.isNumber(
765                                 Type.bind(this.board.jc.snippet(res, true, '', false), this)()
766                             )
767                         ) {
768                             // may also be a string
769                             plaintext += '+(' + res + ').toFixed(' + this.evalVisProp('digits') + ')';
770                         } else {
771                             plaintext += '+(' + res + ')';
772                         }
773                     } else {
774                         plaintext += '+(' + res + ')';
775                     }
776 
777                     contentStr = contentStr.slice(j + 8);
778                     i = contentStr.indexOf("<value>");
779                     j = contentStr.indexOf("</value>");
780                 }
781             }
782 
783             plaintext += ' + "' + this.replaceSub(this.replaceSup(contentStr)) + '"';
784             plaintext = this.convertGeonextAndSketchometry2CSS(plaintext);
785 
786             // This should replace e.g. &pi; by π
787             plaintext = plaintext.replace(/&/g, "&");
788             plaintext = plaintext.replace(/"/g, "'");
789 
790             return plaintext;
791         },
792 
793         /**
794          * Replace value-tags in string by JessieCode functions.
795          * @param {String} contentStr
796          * @returns String
797          * @private
798          * @example
799          * "The x-coordinate of A is <value>X(A)</value>"
800          *
801          */
802         valueTagToJessieCode: function (contentStr) {
803             var res, term,
804                 i, j,
805                 expandShortMath = true,
806                 textComps = [],
807                 tick = '"';
808 
809             contentStr = contentStr || "";
810             contentStr = contentStr.replace(/\r/g, "");
811             contentStr = contentStr.replace(/\n/g, "");
812 
813             contentStr = contentStr.replace(/<value>/g, "<value>");
814             contentStr = contentStr.replace(/<\/value>/g, "</value>");
815 
816             // Convert content of value tag (GEONExT/JessieCode) syntax into JavaScript syntax
817             i = contentStr.indexOf("<value>");
818             j = contentStr.indexOf("</value>");
819             if (i >= 0) {
820                 while (i >= 0) {
821                     // Add string fragment before <value> tag
822                     textComps.push(tick + this.escapeTicks(contentStr.slice(0, i)) + tick);
823 
824                     term = contentStr.slice(i + 7, j);
825                     term = term.replace(/\s+/g, ""); // Remove all whitespace
826                     if (expandShortMath === true) {
827                         term = this.expandShortMath(term);
828                     }
829                     res = term;
830                     res = res.replace(/\\"/g, "'").replace(/\\'/g, "'");
831 
832                     // // Hack: apply rounding once only.
833                     // if (res.indexOf("toFixed") < 0) {
834                     //     // Output of a value tag
835                     //     // Run the JessieCode parser
836                     //     if (
837                     //         Type.isNumber(
838                     //             Type.bind(this.board.jc.snippet(res, true, "", false), this)()
839                     //         )
840                     //     ) {
841                     //         // Output is number
842                     //         // textComps.push(
843                     //         //     '(' + res + ').toFixed(' + this.evalVisProp('digits') + ')'
844                     //         // );
845                     //         textComps.push('(' + res + ')');
846                     //     } else {
847                     //         // Output is a string
848                     //         textComps.push("(" + res + ")");
849                     //     }
850                     // } else {
851                         textComps.push("(" + res + ")");
852                     // }
853                     contentStr = contentStr.slice(j + 8);
854                     i = contentStr.indexOf("<value>");
855                     j = contentStr.indexOf("</value>");
856                 }
857             }
858             // Add trailing string fragment
859             textComps.push(tick + this.escapeTicks(contentStr) + tick);
860 
861             // return textComps.join(" + ").replace(/&/g, "&");
862             for (i = 0; i < textComps.length; i++) {
863                 textComps[i] = textComps[i].replace(/&/g, "&");
864             }
865             return textComps;
866         },
867 
868         /**
869          * Simple math rendering using HTML / CSS only. In case of array,
870          * handle each entry separately and return array with the
871          * rendering strings.
872          *
873          * @param {String|Array} s
874          * @returns {String|Array}
875          * @see JXG.Text#convertGeonextAndSketchometry2CSS
876          * @private
877          * @see JXG.Text#replaceSub
878          * @see JXG.Text#replaceSup
879          * @see JXG.Text#convertGeonextAndSketchometry2CSS
880          */
881         poorMansTeX: function (s) {
882             var i, a;
883             if (Type.isArray(s)) {
884                 a = [];
885                 for (i = 0; i < s.length; i++) {
886                     a.push(this.poorMansTeX(s[i]));
887                 }
888                 return a;
889             }
890 
891             s = s
892                 .replace(/<arc\s*\/*>/g, "∠")
893                 .replace(/<arc\s*\/*>/g, "∠")
894                 .replace(/<sqrt\s*\/*>/g, "√")
895                 .replace(/<sqrt\s*\/*>/g, "√");
896             return this.convertGeonextAndSketchometry2CSS(this.replaceSub(this.replaceSup(s)), true);
897         },
898 
899         /**
900          * Replace ticks by URI escape sequences
901          *
902          * @param {String} s
903          * @returns String
904          * @private
905          *
906          */
907         escapeTicks: function (s) {
908             return s.replace(/"/g, "%22").replace(/'/g, "%27");
909         },
910 
911         /**
912          * Replace escape sequences for ticks by ticks
913          *
914          * @param {String} s
915          * @returns String
916          * @private
917          */
918         unescapeTicks: function (s) {
919             return s.replace(/%22/g, '"').replace(/%27/g, "'");
920         },
921 
922         /**
923          * Converts the GEONExT tags <overline> and <arrow> to
924          * HTML span tags with proper CSS formatting.
925          * @private
926          * @see JXG.Text.poorMansTeX
927          * @see JXG.Text._setText
928          */
929         convertGeonext2CSS: function (s) {
930             if (Type.isString(s)) {
931                 s = s.replace(
932                     /(<|<)overline(>|>)/g,
933                     "<span style=text-decoration:overline;>"
934                 );
935                 s = s.replace(/(<|<)\/overline(>|>)/g, "</span>");
936                 s = s.replace(
937                     /(<|<)arrow(>|>)/g,
938                     "<span style=text-decoration:overline;>"
939                 );
940                 s = s.replace(/(<|<)\/arrow(>|>)/g, "</span>");
941             }
942 
943             return s;
944         },
945 
946         /**
947          * Converts the sketchometry tag <sketchofont> to
948          * HTML span tags with proper CSS formatting.
949          *
950          * @param {String|Function|Number} s Text
951          * @param {Boolean} escape Flag if ticks should be escaped. Escaping is necessary
952          * if s is a text. It has to be avoided if s is a function returning text.
953          * @private
954          * @see JXG.Text._setText
955          * @see JXG.Text.convertGeonextAndSketchometry2CSS
956          *
957          */
958         convertSketchometry2CSS: function (s, escape) {
959             var t1 = "<span class=\"sketcho sketcho-inherit sketcho-",
960                 t2 = "\"></span>";
961 
962             if (Type.isString(s)) {
963                 if (escape) {
964                     t1 = this.escapeTicks(t1);
965                     t2 = this.escapeTicks(t2);
966                 }
967                 s = s.replace(/(<|<)sketchofont(>|>)/g, t1);
968                 s = s.replace(/(<|<)\/sketchofont(>|>)/g, t2);
969             }
970 
971             return s;
972         },
973 
974         /**
975          * Alias for convertGeonext2CSS and convertSketchometry2CSS
976          *
977          * @param {String|Function|Number} s Text
978          * @param {Boolean} escape Flag if ticks should be escaped
979          * @private
980          * @see JXG.Text.convertGeonext2CSS
981          * @see JXG.Text.convertSketchometry2CSS
982          */
983         convertGeonextAndSketchometry2CSS: function (s, escape) {
984             s = this.convertGeonext2CSS(s);
985             s = this.convertSketchometry2CSS(s, escape);
986             return s;
987         },
988 
989         /**
990          * Finds dependencies in a given term and notifies the parents by adding the
991          * dependent object to the found objects child elements.
992          * @param {String} content String containing dependencies for the given object.
993          * @private
994          */
995         notifyParents: function (content) {
996             var search,
997                 res = null;
998 
999             // revert possible jc replacement
1000             content = content.replace(/<value>/g, "<value>");
1001             content = content.replace(/<\/value>/g, "</value>");
1002 
1003             do {
1004                 search = /<value>([\w\s*/^\-+()[\],<>=!]+)<\/value>/;
1005                 res = search.exec(content);
1006 
1007                 if (res !== null) {
1008                     GeonextParser.findDependencies(this, res[1], this.board);
1009                     content = content.slice(res.index);
1010                     content = content.replace(search, "");
1011                 }
1012             } while (res !== null);
1013 
1014             return this;
1015         },
1016 
1017         // documented in element.js
1018         getParents: function () {
1019             var p;
1020             if (this.relativeCoords !== undefined) {
1021                 // Texts with anchor elements, excluding labels
1022                 p = [
1023                     this.relativeCoords.usrCoords[1],
1024                     this.relativeCoords.usrCoords[2],
1025                     this.orgText
1026                 ];
1027             } else {
1028                 // Other texts
1029                 p = [this.Z(), this.X(), this.Y(), this.orgText];
1030             }
1031 
1032             if (this.parents.length !== 0) {
1033                 p = this.parents;
1034             }
1035 
1036             return p;
1037         },
1038 
1039         /**
1040          * Returns the bounding box of the text element in user coordinates as an
1041          * array of length 4: [upper left x, upper left y, lower right x, lower right y].
1042          * The method assumes that the lower left corner is at position [el.X(), el.Y()]
1043          * of the text element el, i.e. the attributes anchorX, anchorY are ignored.
1044          *
1045          * <p>
1046          * <strong>Attention:</strong> for labels, [0, 0, 0, 0] is returned.
1047          *
1048          * @returns Array
1049          */
1050         bounds: function () {
1051             var c = this.coords.usrCoords;
1052 
1053             if (
1054                 this.evalVisProp('islabel') ||
1055                 this.board.unitY === 0 ||
1056                 this.board.unitX === 0
1057             ) {
1058                 return [0, 0, 0, 0];
1059             }
1060             return [
1061                 c[1],
1062                 c[2] + this.size[1] / this.board.unitY,
1063                 c[1] + this.size[0] / this.board.unitX,
1064                 c[2]
1065             ];
1066         },
1067 
1068         /**
1069          * Returns the value of the attribute "anchorX". If this equals "auto",
1070          * returns "left", "middle", or "right", depending on the
1071          * value of the attribute "position".
1072          * @returns String
1073          */
1074         getAnchorX: function () {
1075             var a = this.evalVisProp('anchorx');
1076             if (a === "auto") {
1077                 switch (this.visProp.position) {
1078                     case "top":
1079                     case "bot":
1080                         return "middle";
1081                     case "rt":
1082                     case "lrt":
1083                     case "urt":
1084                         return "left";
1085                     case "lft":
1086                     case "llft":
1087                     case "ulft":
1088                     default:
1089                         return "right";
1090                 }
1091             }
1092             return a;
1093         },
1094 
1095         /**
1096          * Returns the value of the attribute "anchorY". If this equals "auto",
1097          * returns "bottom", "middle", or "top", depending on the
1098          * value of the attribute "position".
1099          * @returns String
1100          */
1101         getAnchorY: function () {
1102             var a = this.evalVisProp('anchory');
1103             if (a === "auto") {
1104                 switch (this.visProp.position) {
1105                     case "top":
1106                     case "ulft":
1107                     case "urt":
1108                         return "bottom";
1109                     case "bot":
1110                     case "lrt":
1111                     case "llft":
1112                         return "top";
1113                     case "rt":
1114                     case "lft":
1115                     default:
1116                         return "middle";
1117                 }
1118             }
1119             return a;
1120         },
1121 
1122         /**
1123          * Computes the number of overlaps of a box of w pixels width, h pixels height
1124          * and center (x, y)
1125          *
1126          * @private
1127          * @param  {Number} x x-coordinate of the center (screen coordinates)
1128          * @param  {Number} y y-coordinate of the center (screen coordinates)
1129          * @param  {Number} w width of the box in pixel
1130          * @param  {Number} h width of the box in pixel
1131          * @param  {Array} [whiteList] array of ids which should be ignored
1132          * @return {Number}   Number of overlapping elements
1133          */
1134         getNumberOfConflicts: function (x, y, w, h, whiteList) {
1135             whiteList = whiteList || [];
1136             var count = 0,
1137                 i, obj, le,
1138                 savePointPrecision,
1139                 saveHasInnerPoints;
1140 
1141             // Set the precision of hasPoint to half the max if label isn't too long
1142             savePointPrecision = this.board.options.precision.hasPoint;
1143             // this.board.options.precision.hasPoint = Math.max(w, h) * 0.5;
1144             this.board.options.precision.hasPoint = (w + h) * 0.25;
1145             // TODO:
1146             // Make it compatible with the objects' visProp.precision attribute
1147             for (i = 0, le = this.board.objectsList.length; i < le; i++) {
1148                 obj = this.board.objectsList[i];
1149                 saveHasInnerPoints = obj.visProp.hasinnerpoints;
1150                 obj.visProp.hasinnerpoints = false;
1151                 if (
1152                     obj.visPropCalc.visible &&
1153                     obj.elType !== "axis" &&
1154                     obj.elType !== "ticks" &&
1155                     obj !== this.board.infobox &&
1156                     obj !== this &&
1157                     obj.hasPoint(x, y) &&
1158                     whiteList.indexOf(obj.id) === -1
1159                 ) {
1160                     count++;
1161                 }
1162                 obj.visProp.hasinnerpoints = saveHasInnerPoints;
1163             }
1164             this.board.options.precision.hasPoint = savePointPrecision;
1165 
1166             return count;
1167         },
1168 
1169         /**
1170          * Sets the offset of a label element to the position with the least number
1171          * of overlaps with other elements, while retaining the distance to its
1172          * anchor element. Twelve different angles are possible.
1173          *
1174          * @returns {JXG.Text} Reference to the text object.
1175          */
1176         setAutoPosition: function () {
1177             var x, y, cx, cy,
1178                 anchorCoords,
1179                 // anchorX, anchorY,
1180                 w = this.size[0],
1181                 h = this.size[1],
1182                 start_angle, angle,
1183                 optimum = {
1184                     conflicts: Infinity,
1185                     angle: 0,
1186                     r: 0
1187                 },
1188                 max_r, delta_r,
1189                 conflicts, offset, r,
1190                 num_positions = 12,
1191                 step = (2 * Math.PI) / num_positions,
1192                 j, dx, dy, co, si;
1193 
1194             if (
1195                 this === this.board.infobox ||
1196                 !this.visPropCalc.visible ||
1197                 !this.evalVisProp('islabel') ||
1198                 !this.element
1199             ) {
1200                 return this;
1201             }
1202 
1203             // anchorX = this.evalVisProp('anchorx');
1204             // anchorY = this.evalVisProp('anchory');
1205             offset = this.evalVisProp('offset');
1206             anchorCoords = this.element.getLabelAnchor();
1207             cx = anchorCoords.scrCoords[1];
1208             cy = anchorCoords.scrCoords[2];
1209 
1210             // Set dx, dy as the relative position of the center of the label
1211             // to its anchor element ignoring anchorx and anchory.
1212             dx = offset[0];
1213             dy = offset[1];
1214 
1215             conflicts = this.getNumberOfConflicts(cx + dx, cy - dy, w, h, this.evalVisProp('autopositionwhitelist'));
1216             if (conflicts === 0) {
1217                 return this;
1218             }
1219             // console.log(this.id, conflicts, w, h);
1220             // r = Geometry.distance([0, 0], offset, 2);
1221 
1222             r = this.evalVisProp('autopositionmindistance');
1223             max_r = this.evalVisProp('autopositionmaxdistance');
1224             delta_r = 0.2 * r;
1225 
1226             start_angle = Math.atan2(dy, dx);
1227 
1228             optimum.conflicts = conflicts;
1229             optimum.angle = start_angle;
1230             optimum.r = r;
1231 
1232             while (optimum.conflicts > 0 && r <= max_r) {
1233                 for (
1234                     j = 1, angle = start_angle + step;
1235                     j < num_positions && optimum.conflicts > 0;
1236                     j++
1237                 ) {
1238                     co = Math.cos(angle);
1239                     si = Math.sin(angle);
1240 
1241                     x = cx + r * co;
1242                     y = cy - r * si;
1243 
1244                     conflicts = this.getNumberOfConflicts(x, y, w, h, this.evalVisProp('autopositionwhitelist'));
1245                     if (conflicts < optimum.conflicts) {
1246                         optimum.conflicts = conflicts;
1247                         optimum.angle = angle;
1248                         optimum.r = r;
1249                     }
1250                     if (optimum.conflicts === 0) {
1251                         break;
1252                     }
1253                     angle += step;
1254                 }
1255                 r += delta_r;
1256             }
1257             // console.log(this.id, "after", optimum)
1258             r = optimum.r;
1259             co = Math.cos(optimum.angle);
1260             si = Math.sin(optimum.angle);
1261             this.visProp.offset = [r * co, r * si];
1262 
1263             if (co < -0.2) {
1264                 this.visProp.anchorx = "right";
1265             } else if (co > 0.2) {
1266                 this.visProp.anchorx = "left";
1267             } else {
1268                 this.visProp.anchorx = "middle";
1269             }
1270 
1271             return this;
1272         }
1273     }
1274 );
1275 
1276 /**
1277  * @class Constructs a text element.
1278  *
1279  * The coordinates can either be absolute (i.e. respective to the coordinate system of the board) or be relative to the coordinates of an element
1280  * given in {@link Text#anchor}.
1281  * <p>
1282  * HTML, MathJaX, KaTeX and GEONExT syntax can be handled.
1283  * <p>
1284  * There are two ways to display texts:
1285  * <ul>
1286  * <li> using the text element of the renderer (canvas or svg). In most cases this is the suitable approach if speed matters.
1287  * However, advanced rendering like MathJax, KaTeX or HTML/CSS are not possible.
1288  * <li> using HTML <div>. This is the most flexible approach. The drawback is that HTML can only be display "above" the geometry elements.
1289  * If HTML should be displayed in an inbetween layer, conder to use an element of type {@link ForeignObject} (available in svg renderer, only).
1290  * </ul>
1291  * @pseudo
1292  * @name Text
1293  * @augments JXG.Text
1294  * @constructor
1295  * @type JXG.Text
1296  *
1297  * @param {number,function_number,function_number,function_String,function} z_,x,y,str Parent elements for text elements.
1298  *                     <p>
1299  *   Parent elements can be two or three elements of type number, a string containing a GEONE<sub>x</sub>T
1300  *   constraint, or a function which takes no parameter and returns a number. Every parent element beside the last determines one coordinate.
1301  *   If a coordinate is
1302  *   given by a number, the number determines the initial position of a free text. If given by a string or a function that coordinate will be constrained
1303  *   that means the user won't be able to change the texts's position directly by mouse because it will be calculated automatically depending on the string
1304  *   or the function's return value. If two parent elements are given the coordinates will be interpreted as 2D affine Euclidean coordinates, if three such
1305  *   parent elements are given they will be interpreted as homogeneous coordinates.
1306  *                     <p>
1307  *                     The text to display may be given as string or as function returning a string.
1308  *
1309  * There is the attribute 'display' which takes the values 'html' or 'internal'. In case of 'html' an HTML division tag is created to display
1310  * the text. In this case it is also possible to use MathJax, KaTeX, or ASCIIMathML. If neither of these is used, basic Math rendering is
1311  * applied.
1312  * <p>
1313  * In case of 'internal', an SVG text element is used to display the text.
1314  * @see JXG.Text
1315  * @example
1316  * // Create a fixed text at position [0,1].
1317  *   var t1 = board.create('text',[0,1,"Hello World"]);
1318  * </pre><div class="jxgbox" id="JXG896013aa-f24e-4e83-ad50-7bc7df23f6b7" style="width: 300px; height: 300px;"></div>
1319  * <script type="text/javascript">
1320  *   var t1_board = JXG.JSXGraph.initBoard('JXG896013aa-f24e-4e83-ad50-7bc7df23f6b7', {boundingbox: [-3, 6, 5, -3], axis: true, showcopyright: false, shownavigation: false});
1321  *   var t1 = t1_board.create('text',[0,1,"Hello World"]);
1322  * </script><pre>
1323  * @example
1324  * // Create a variable text at a variable position.
1325  *   var s = board.create('slider',[[0,4],[3,4],[-2,0,2]]);
1326  *   var graph = board.create('text',
1327  *                        [function(x){ return s.Value();}, 1,
1328  *                         function(){return "The value of s is"+JXG.toFixed(s.Value(), 2);}
1329  *                        ]
1330  *                     );
1331  * </pre><div class="jxgbox" id="JXG5441da79-a48d-48e8-9e53-75594c384a1c" style="width: 300px; height: 300px;"></div>
1332  * <script type="text/javascript">
1333  *   var t2_board = JXG.JSXGraph.initBoard('JXG5441da79-a48d-48e8-9e53-75594c384a1c', {boundingbox: [-3, 6, 5, -3], axis: true, showcopyright: false, shownavigation: false});
1334  *   var s = t2_board.create('slider',[[0,4],[3,4],[-2,0,2]]);
1335  *   var t2 = t2_board.create('text',[function(x){ return s.Value();}, 1, function(){return "The value of s is "+JXG.toFixed(s.Value(), 2);}]);
1336  * </script><pre>
1337  * @example
1338  * // Create a text bound to the point A
1339  * var p = board.create('point',[0, 1]),
1340  *     t = board.create('text',[0, -1,"Hello World"], {anchor: p});
1341  *
1342  * </pre><div class="jxgbox" id="JXGff5a64b2-2b9a-11e5-8dd9-901b0e1b8723" style="width: 300px; height: 300px;"></div>
1343  * <script type="text/javascript">
1344  *     (function() {
1345  *         var board = JXG.JSXGraph.initBoard('JXGff5a64b2-2b9a-11e5-8dd9-901b0e1b8723',
1346  *             {boundingbox: [-8, 8, 8,-8], axis: true, showcopyright: false, shownavigation: false});
1347  *     var p = board.create('point',[0, 1]),
1348  *         t = board.create('text',[0, -1,"Hello World"], {anchor: p});
1349  *
1350  *     })();
1351  *
1352  * </script><pre>
1353  *
1354  */
1355 JXG.createText = function (board, parents, attributes) {
1356     var t,
1357         attr = Type.copyAttributes(attributes, board.options, "text"),
1358         coords = parents.slice(0, -1),
1359         content = parents[parents.length - 1];
1360 
1361     // Backwards compatibility
1362     attr.anchor = attr.parent || attr.anchor;
1363     t = CoordsElement.create(JXG.Text, board, coords, attr, content);
1364 
1365     if (!t) {
1366         throw new Error(
1367             "JSXGraph: Can't create text with parent types '" +
1368                 typeof parents[0] +
1369                 "' and '" +
1370                 typeof parents[1] +
1371                 "'." +
1372                 "\nPossible parent types: [x,y], [z,x,y], [element,transformation]"
1373         );
1374     }
1375 
1376     if (attr.rotate !== 0) {
1377         // This is the default value, i.e. no rotation
1378         t.addRotation(attr.rotate);
1379     }
1380 
1381     return t;
1382 };
1383 
1384 JXG.registerElement("text", JXG.createText);
1385 
1386 /**
1387  * @class Labels are text objects tied to other elements like points, lines and curves.
1388  * Labels are handled internally by JSXGraph, only. There is NO constructor "board.create('label', ...)".
1389  *
1390  * @description
1391  * Labels for points are positioned with the attributes {@link Text#anchorX}, {@link Text#anchorX} and {@link Label#offset}.
1392  * <p>
1393  * Labels for lines, segments, curves and circles can be controlled additionally by the attributes {@link Label#position} and
1394  * {@link Label#distance}, i.e. for a segment [A, B] one could use the follwoing attributes:
1395  * <ul>
1396  * <li> "position": determines, where in the direction of the segment from A to B the label is placed
1397  * <li> "distance": determines the (orthogonal) distance of the label from the line segment. It is a factor which is multiplied by the font-size.
1398  * <li> "offset: [h, v]": a final correction in pixel (horizontally: h, vertically: v)
1399  * <li> "anchorX" ('left', 'middle', 'right') and "anchorY" ('bottom', 'middle', 'top'): determines which part of the
1400  * label string is the anchor position that is positioned to the coordinates determined by "position", "distance" and "offset".
1401  * </ul>
1402  *
1403  * @pseudo
1404  * @name Label
1405  * @augments JXG.Text
1406  * @constructor
1407  * @type JXG.Text
1408  */
1409 //  See element.js#createLabel
1410 
1411 /**
1412  * [[x,y], [w px, h px], [range]
1413  */
1414 JXG.createHTMLSlider = function (board, parents, attributes) {
1415     var t,
1416         par,
1417         attr = Type.copyAttributes(attributes, board.options, "htmlslider");
1418 
1419     if (parents.length !== 2 || parents[0].length !== 2 || parents[1].length !== 3) {
1420         throw new Error(
1421             "JSXGraph: Can't create htmlslider with parent types '" +
1422                 typeof parents[0] +
1423                 "' and '" +
1424                 typeof parents[1] +
1425                 "'." +
1426                 "\nPossible parents are: [[x,y], [min, start, max]]"
1427         );
1428     }
1429 
1430     // Backwards compatibility
1431     attr.anchor = attr.parent || attr.anchor;
1432     attr.fixed = attr.fixed || true;
1433 
1434     par = [
1435         parents[0][0],
1436         parents[0][1],
1437         '<form style="display:inline">' +
1438             '<input type="range" /><span></span><input type="text" />' +
1439             "</form>"
1440     ];
1441 
1442     t = JXG.createText(board, par, attr);
1443     t.type = Type.OBJECT_TYPE_HTMLSLIDER;
1444 
1445     t.rendNodeForm = t.rendNode.childNodes[0];
1446 
1447     t.rendNodeRange = t.rendNodeForm.childNodes[0];
1448     t.rendNodeRange.min = parents[1][0];
1449     t.rendNodeRange.max = parents[1][2];
1450     t.rendNodeRange.step = attr.step;
1451     t.rendNodeRange.value = parents[1][1];
1452 
1453     t.rendNodeLabel = t.rendNodeForm.childNodes[1];
1454     t.rendNodeLabel.id = t.rendNode.id + "_label";
1455 
1456     if (attr.withlabel) {
1457         t.rendNodeLabel.innerHTML = t.name + "=";
1458     }
1459 
1460     t.rendNodeOut = t.rendNodeForm.childNodes[2];
1461     t.rendNodeOut.value = parents[1][1];
1462 
1463     try {
1464         t.rendNodeForm.id = t.rendNode.id + "_form";
1465         t.rendNodeRange.id = t.rendNode.id + "_range";
1466         t.rendNodeOut.id = t.rendNode.id + "_out";
1467     } catch (e) {
1468         JXG.debug(e);
1469     }
1470 
1471     t.rendNodeRange.style.width = attr.widthrange + "px";
1472     t.rendNodeRange.style.verticalAlign = "middle";
1473     t.rendNodeOut.style.width = attr.widthout + "px";
1474 
1475     t._val = parents[1][1];
1476 
1477     if (JXG.supportsVML()) {
1478         /*
1479          * OnChange event is used for IE browsers
1480          * The range element is supported since IE10
1481          */
1482         Env.addEvent(t.rendNodeForm, "change", priv.HTMLSliderInputEventHandler, t);
1483     } else {
1484         /*
1485          * OnInput event is used for non-IE browsers
1486          */
1487         Env.addEvent(t.rendNodeForm, "input", priv.HTMLSliderInputEventHandler, t);
1488     }
1489 
1490     t.Value = function () {
1491         return this._val;
1492     };
1493 
1494     return t;
1495 };
1496 
1497 JXG.registerElement("htmlslider", JXG.createHTMLSlider);
1498 
1499 export default JXG.Text;
1500 // export default {
1501 //     Text: JXG.Text,
1502 //     createText: JXG.createText,
1503 //     createHTMLSlider: JXG.createHTMLSlider
1504 // };
1505