Difference between revisions of "Even simpler function plotter"

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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="clear all" onClick="clearAll()"> <br />
+
<input type="button" value="clear all" onClick="clearAll()">
 
<input type="button" value="add tangent" onClick="addTangent()">
 
<input type="button" value="add tangent" onClick="addTangent()">
 
<input type="button" value="add Derivative" onClick="addDerivative()">
 
<input type="button" value="add Derivative" onClick="addDerivative()">

Revision as of 16:11, 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});
}