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| | This example shows how you can change the equation of a graph without creating the whole construction again. | | This example shows how you can change the equation of a graph without creating the whole construction again. |
| − | | + | <nowiki><input type="text" id="eingabe" value="Math.sin(x)*Math.cos(x)"> |
| − | <div style="width:960px">
| + | </nowiki> |
| − | <div id="jxgbox" class="jxgbox" style="width:600px; height:400px; float:left; "></div>
| |
| − | <p style="float:right"> | |
| − | <input type="text" id="eingabe" value="Math.sin(x)*Math.cos(x)"> | |
| − | | |
| − | <input type="button" value="set" onClick="doIt()" style='margin:1em'>
| |
| − | </p>
| |
| − | </div>
| |
| − | <br clear=all>
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| − | <div id="debug" style="display:none;"></div>
| |
| − | <script type="text/javascript">
| |
| − | /* <![CDATA[ */
| |
| − | | |
| − | board = JXG.JSXGraph.initBoard('jxgbox', {originX: 250, originY: 250, unitX: 40, unitY: 20});
| |
| − | // Axes
| |
| − | b1axisx = board.createElement('axis', [[1,0], [0,0]], {});
| |
| − | b1axisy = board.createElement('axis', [[0,1], [0,0]], {});
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| − |
| |
| − | eval("function f(x){ return "+document.getElementById("eingabe").value+";}");
| |
| − | graph = board.createElement('curve', [function(x){ return x; }, function(x){ return f(x); }, "x", -10, 10]);
| |
| − | //graph = eval("board.createElement('curve', [function(x){ return x; }, function(x){ return "+document.getElementById("eingabe").value+";}, 'x', -10, 10])");
| |
| − | //graph.curveType = "graph";
| |
| − | p1 = board.createElement('glider', [graph], {style:6, name:'P'});
| |
| − | g = board.algebra.D(f);
| |
| − | p2 = board.createElement('point', [function() { return p1.X()+1;}, function() {return p1.Y()+board.algebra.D(graph.Y)(p1.X());}], {style:1, name:''});
| |
| − | l1 = board.createElement('line', [p1,p2],{});
| |
| − | p3 = board.createElement('point', [function() { return p2.X();}, function() {return p1.Y();}],{style:1, name:''});
| |
| − | pol = board.createElement('polygon', [p1,p2,p3], {});
| |
| − | t = board.createElement('text', [function(){return p1.X()+1.1;},function(){return p1.Y()+(p2.Y()-p3.Y())/2;},function(){ return "m="+(board.round(p2.Y()-p3.Y(),2));}]);
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| − |
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| − |
| |
| − | function doIt(){
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| − | eval("function f(x){ return "+document.getElementById("eingabe").value+";}");
| |
| − | graph.yterm = function(x){ return f(x); }; // usually: e.g. "x^2"
| |
| − | //graph.yterm = eval("function(x){ return "+document.getElementById("eingabe").value+"; };");
| |
| − | graph.Y = graph.yterm;
| |
| − | graph.updateCurve();
| |
| − | board.update();
| |
| − | }
| |
| − |
| |
| − | /* ]]> */
| |
| − | </script>
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