Parametric curve plotter: Difference between revisions

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   <textarea cols=60 rows=4 id="eingabe">function x(t) {return Math.cos(t); };
   <textarea cols=60 rows=4 id="eingabe">function x(t) {return Math.cos(t); };
function y(t) {return Math.sin(t); };</textarea><br />
function y(t) {return Math.sin(t); };</textarea><br />
   <input type="button" value="plot" onClick="doIt()">
   <input type="button" value="plot" onClick="plot()">
   <input type="button" value="clear all" onClick="clearAll()">
   <input type="button" value="clear all" onClick="clearAll()">
  <input type='button' value='Zoom In' onclick='board.zoomIn()' >
  <input type='button' value='Zoom Out' onclick='board.zoomOut()' >
  <input type='button' value='Zoom 100%' onclick='board.zoom100()'>
</p>
</p>
</html>
</html>
<jsxgraph width="600" height="400">
<jsxgraph width="500" height="500">
board = JXG.JSXGraph.initBoard('jxgbox', {axis:true, originX: 250, originY: 250, unitX: 50, unitY: 50});
board = JXG.JSXGraph.initBoard('jxgbox', {axis:true, boundingbox:[-5,5,5,-5]});
a = board.createElement('slider', [[0,-1],[5,-1],[-4*Math.PI,0,0]], {style:6, name:'a'});
a = board.create('slider', [[0,-1],[3,-1],[-4*Math.PI,0,0]], {style:6, name:'a'});
b = board.createElement('slider', [[0,-2],[5,-2],[0,1,4*Math.PI]], {style:6, name:'b'});
b = board.create('slider', [[0,-2],[3,-2],[0,1,4*Math.PI]], {style:6, name:'b'});
function doIt(){
function plot(){
   eval(document.getElementById("eingabe").value);
   eval(document.getElementById("eingabe").value);
   graph = board.createElement('curve', [
   graph = board.create('curve', [
             x,y,  
             x,y,  
             function(){return a.Value();},  
             function(){return a.Value();},  
Line 25: Line 22:
   board.update();
   board.update();
}  
}  
doIt();
 
function clearAll() {  
function clearAll() {  
   JXG.JSXGraph.freeBoard(board);
   JXG.JSXGraph.freeBoard(board);
   board = JXG.JSXGraph.initBoard('jxgbox', {axis:true, originX: 250, originY: 250, unitX: 50, unitY: 50});
   board = JXG.JSXGraph.initBoard('jxgbox', {axis:true, boundingbox: [-5, 5, 5, -5]});
   a = board.createElement('slider', [[0,-1],[5,-1],[-4*Math.PI,0,0]], {style:6, name:'a'});
   a = board.create('slider', [[0,-1],[3,-1],[-4*Math.PI,0,0]], {style:6, name:'a'});
   b = board.createElement('slider', [[0,-2],[5,-2],[0,1,4*Math.PI]], {style:6, name:'b'});
   b = board.create('slider', [[0,-2],[3,-2],[0,1,4*Math.PI]], {style:6, name:'b'});
}
}
plot();
</jsxgraph>
</jsxgraph>


===The JavaScript code===
===The JavaScript code===
<source lang="xml">
<source lang="javascript">
<source>
board = JXG.JSXGraph.initBoard('jxgbox', {axis:true, boundingbox:[-5,5,5,-5]});
a = board.create('slider', [[0,-1],[3,-1],[-4*Math.PI,0,0]], {style:6, name:'a'});
b = board.create('slider', [[0,-2],[3,-2],[0,1,4*Math.PI]], {style:6, name:'b'});
function plot(){
  eval(document.getElementById("eingabe").value);
  graph = board.create('curve', [
            x,y,
            function(){return a.Value();},
            function(){return b.Value();}
            ],
            {strokeColor:'red', strokeWidth:2}
          );
  board.update();
}
 
function clearAll() {
  JXG.JSXGraph.freeBoard(board);
  board = JXG.JSXGraph.initBoard('jxgbox', {axis:true, boundingbox: [-5, 5, 5, -5]});
  a = board.create('slider', [[0,-1],[3,-1],[-4*Math.PI,0,0]], {style:6, name:'a'});
  b = board.create('slider', [[0,-2],[3,-2],[0,1,4*Math.PI]], {style:6, name:'b'});
}
 
plot();
</source>


[[Category:Examples]]
[[Category:Examples]]
[[Category:Calculus]]
[[Category:Calculus]]
[[Category:Curves]]

Latest revision as of 13:06, 3 March 2021


The JavaScript code

board = JXG.JSXGraph.initBoard('jxgbox', {axis:true, boundingbox:[-5,5,5,-5]});
a = board.create('slider', [[0,-1],[3,-1],[-4*Math.PI,0,0]], {style:6, name:'a'});
b = board.create('slider', [[0,-2],[3,-2],[0,1,4*Math.PI]], {style:6, name:'b'});
function plot(){
  eval(document.getElementById("eingabe").value);
  graph = board.create('curve', [
            x,y, 
            function(){return a.Value();}, 
            function(){return b.Value();}
            ], 
            {strokeColor:'red', strokeWidth:2}
          );
  board.update();
} 

function clearAll() { 
  JXG.JSXGraph.freeBoard(board);
  board = JXG.JSXGraph.initBoard('jxgbox', {axis:true, boundingbox: [-5, 5, 5, -5]});
  a = board.create('slider', [[0,-1],[3,-1],[-4*Math.PI,0,0]], {style:6, name:'a'});
  b = board.create('slider', [[0,-2],[3,-2],[0,1,4*Math.PI]], {style:6, name:'b'});
}

plot();
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