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<html>
<head>
<link rel="stylesheet" type="text/css" href="/jsxgraph/distrib/jsxgraph.css" />
<script type="text/javascript" src="../distrib/jsxgraphcore.js"></script>
</head>
<body>
<div id="jsxgbox" class="jxgbox" style="width:800px; height:800px;"></div>
<div id="debug" style="display:block;"></div>
<script type="text/javascript">
var board = JXG.JSXGraph.initBoard('jsxgbox', {originX: 300, originY: 300, unitX: 50, unitY: 50});
//var S = board.create('slider', [-5,-6,10,0,1,0.5], {name:'S'});
var S = board.create('slider', [[-5,-6],[5,-6],[0,0.5,1]], {name:'S'});
//
var points = [];
points[0] = board.create('point',[5, 5], {name:''});
points[1] = board.create('point',[-5, 5], {name:''});
points[2] = board.create('point',[-5, -5], {name:''});
points[3] = board.create('point',[5, -5], {name:''});
function viereck(pt, n) {
var arr = new Array();
for(var i = 0; i < 4; i++) {
arr[i] = board.create('point',
[function(t) {
return function () {var x = pt[t].X();
var x1 = pt[(t+1)%4].X();
var s = S.Value();
return x+(x1-x)*s;
}}(i),
function(t) {
return function () {var y = pt[t].Y();
var y1 = pt[(t+1)%4].Y();
var s = S.Value();
return y+(y1-y)*s;
}}(i)
],
{ name:"", withLabel:false, size:1});
}
board.create('polygon',pt, {fillColor: JXG.hsv2rgb(100,0.6,(n/30.0)*(n/30.0)), fillOpacity:0.4});
if(n>0) {
viereck(arr, --n);
}
}
//board.suspendUpdate();
viereck(points,10);
//board.unsuspendUpdate();
//*/
</script>
</body>
</html>
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