Difference between revisions of "Even simpler function plotter"
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Jump to navigationJump to searchA WASSERMANN (talk | contribs) |
A WASSERMANN (talk | contribs) |
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| Line 2: | Line 2: | ||
<input type="text" id="input" value="sin(x)*x"> | <input type="text" id="input" value="sin(x)*x"> | ||
<input type="button" value="plot" onClick="plotter()"> | <input type="button" value="plot" onClick="plotter()"> | ||
| + | <input type="button" value="add tangent" onClick="addTangent()"> | ||
<input type="button" value="clear all" onClick="clearAll()"> | <input type="button" value="clear all" onClick="clearAll()"> | ||
</form> | </form> | ||
| Line 7: | Line 8: | ||
<jsxgraph width="600" height="400"> | <jsxgraph width="600" height="400"> | ||
var board = JXG.JSXGraph.initBoard('jxgbox', {boundingbox:[-5,8,8,-5], axis:true}); | var board = JXG.JSXGraph.initBoard('jxgbox', {boundingbox:[-5,8,8,-5], axis:true}); | ||
| + | var f, curve; // global objects | ||
function plotter() { | function plotter() { | ||
| − | var | + | var txt = JXG.GeonextParser.geonext2JS(document.getElementById('input').value); |
| − | + | f = new Function('x','var y = '+txt+'; return y;'); | |
| − | board.create('functiongraph',[f, | + | curve = board.create('functiongraph',[f, |
function(){ | function(){ | ||
var c = new JXG.Coords(JXG.COORDS_BY_SCREEN,[0,0],board); | var c = new JXG.Coords(JXG.COORDS_BY_SCREEN,[0,0],board); | ||
| Line 22: | Line 24: | ||
]); | ]); | ||
} | } | ||
| + | |||
function clearAll() { | function clearAll() { | ||
JXG.JSXGraph.freeBoard(board); | JXG.JSXGraph.freeBoard(board); | ||
board = JXG.JSXGraph.initBoard('jxgbox', {boundingbox:[-5,8,8,-5], axis:true}); | board = JXG.JSXGraph.initBoard('jxgbox', {boundingbox:[-5,8,8,-5], axis:true}); | ||
} | } | ||
| + | |||
| + | function addTangent() { | ||
| + | board.suspendUpdate(); | ||
| + | var p = board.create('glider',[0,0,curve], {name:'drag me'}); | ||
| + | board.create('tangent',[p], {name:'drag me'}); | ||
| + | board.unsuspendUpdate(); | ||
| + | } | ||
| + | |||
</jsxgraph> | </jsxgraph> | ||
===The underlying JavaScript code=== | ===The underlying JavaScript code=== | ||
Revision as of 16:05, 15 July 2010
The underlying JavaScript code
<input type="text" id="input" value="sin(x)*x">
<input type="button" value="plot" onClick="plotter()">
<input type="button" value="clear all" onClick="clearAll()">
var board = JXG.JSXGraph.initBoard('jxgbox', {boundingbox:[-5,8,8,-5], axis:true});
function plotter() {
var t = JXG.GeonextParser.geonext2JS(document.getElementById('input').value);
var f = new Function('x','var y = '+t+'; return y;');
board.create('functiongraph',[f,
function(){
var c = new JXG.Coords(JXG.COORDS_BY_SCREEN,[0,0],board);
return c.usrCoords[1];
},
function(){
var c = new JXG.Coords(JXG.COORDS_BY_SCREEN,[board.canvasWidth,0],board);
return c.usrCoords[1];
}
]);
}
function clearAll() {
JXG.JSXGraph.freeBoard(board);
board = JXG.JSXGraph.initBoard('jxgbox', {boundingbox:[-5,8,8,-5], axis:true});
}
