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jsxgraph 1.3.5+dfsg1-2
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<html>
<head>
    <title>JSXGraph example</title>
    <link rel="stylesheet" type="text/css" href="../distrib/jsxgraph.css" />

    <!--script type="text/javascript" src="/jsxgraph/distrib/MathJax/MathJax.js"></script-->
    <!--script type="text/javascript" src="/jsxgraph/distrib/jsxgraphcore.js"></script-->
    <!--script type="text/javascript" src="../src/jsxgraphcore.js"></script-->
    <script type="text/javascript" src="../src/loadjsxgraph.js"></script>
    <!--script type="text/javascript" src="../../JessieCode/jessiecode.par.js"></script-->
    <!--script type="text/javascript" src="../../JessieCode/jessiecode.bnf.js"></script-->

    <script type="text/javascript" src="/javascript/jquery/jquery.js"></script>

    <script id="shader-fs" type="x-shader/x-fragment">
        #ifdef GL_ES
        precision highp float;
        #endifhandleAt

        void main(void) {
            gl_FragColor = vec4(1.0, 1.0, 1.0, 1.0);
        }
    </script>

    <script id="shader-vs" type="x-shader/x-vertex">
        attribute vec3 aVertexPosition;

        uniform mat4 uMVMatrix;
        uniform mat4 uPMatrix;

        void main(void) {
            gl_Position = uPMatrix * uMVMatrix * vec4(aVertexPosition, 1.0);
        }
    </script>
</head>
<body>

<h2>Playground to test things temporarily. May change very often.</h2>

<!--a href="javascript:zoomPoints();">Zoom all points (new)</a><br />
<a href="javascript:brd.zoomAllPoints();">Zoom all points (old)</a><br />
<a href="javascript:zoomAll();">Zoom all elements (new)</a-->

<input type="text" id="input" value="sin(x)*x">
<input type="button" value="plot" onClick="plotter()">
<input type="button" value="clear all" onClick="clearAll()">

<div style="width:800px">
  <div id="jxgbox" class="jxgbox" style="width:800px; height:800px; float:left;"></div>
  <!--div id="jxgbox2" class="jxgbox" style="width:800px; height:800px; float:left"></div-->
</div>

<div id="debug" style="display:block;">DEBUG</div>
<a href="javascript:gJSX();" id="hideaxis">gJSX</a>
<img id="snapshot" />
<script type="text/javascript">
    /* <![CDATA[ */

    var rotate = (function () {
        JXG.Options.text.display = 'internal';
        
        var board = JXG.JSXGraph.initBoard('jxgbox', {axis: false, boundingbox: [-10,10,10,-10], grid: true, keepaspectratio: true}),
            p = board.create('point', [1, 2]);
        
        //p.label.content.addRotation(30);
        //board.update();
        
        // OR
        
        p.label.content.setProperty({rotate: 30});
    }());
    
    var setprop = (function () {
        var board = JXG.JSXGraph.initBoard('jxgbox', {axis: false, boundingbox: [-10,10,10,-10], grid: true, keepaspectratio: true}),
            line, lines = ['Math.sin(x)', 'Math.cos(x)', 'Math.tan(x)'], funcs = {};
        
        for (line in lines) {
            var fname = 'f_'.concat(line);
            funcs[fname] = (function (fun) {
                return new Function ('x', 'return (' + fun + ');');
            })(lines[line]);
            board.create('functiongraph', [funcs['f_'.concat(line)]],{name: fname, strokeWidth: 2, dash:2, strokeColor  : 'green', doAdvancedPlot:false});
        }   
        
        board.create('axis', [[0, 0], [1, 0]], {ticks: {drawZero: false}});
    });
    
    var spline = (function () {
        var board = JXG.JSXGraph.initBoard('jxgbox', {boundingbox: [-5, 10, 7, -5], axis:true});
        var p = [];
        p[0] = board.create('point', [-1,2], {size: 4, face: 'o'});
        p[1] = board.create('point', [0,-1], {size: 4, face: 'o'});
        p[2] = board.create('point', [1,0], {size: 4, face: 'o'});
        p[3] = board.create('point', [2,1], {size: 4, face: 'o'});

        var c = board.create('spline', p, {strokeWidth:3});
    });

    var alex_integral = (function () {
        var board = JXG.JSXGraph.initBoard('jxgbox', {boundingbox:[-5,8,8,-5], axis: {ticks: {scale: 3.14, scaleSymbol: '&pi;'}}, zoom: false, /*pan: false,*/ grid: false});

        var p = board.create('plot', [Math.sin]);

        var i = board.create('integral', [p, [-2, 2]], {label: {visible: false}, curveLeft: {color: 'green', size: 20, strokeWidth: 7}, color: 'blue'});

    });

    var simple = (function () {
        var board = JXG.JSXGraph.initBoard('jxgbox', {boundingbox:[-5,8,8,-5], axis: {ticks: {scale: 3.14, scaleSymbol: '&pi;'}}, zoom: false, /*pan: false,*/ grid: false});

        var p = board.create('point', [0, 0], {label: {offset: [10,10]}});
        var q = board.create('point', [3.14, 0], {label: {offset: [10,10]}});
        var r = board.create('point', [0, 1], {label: {offset: [10,10]}});

        var a = board.create('angle', [p, q, r]);
        
        var t = board.create('text', [2, 2, '<button onclick="alert(\'Hello!\');">Click</button>'], {fixed: true});
    });

    var drei = (function () {
        JXG.Options.renderer = 'svg';
        var board = JXG.JSXGraph.initBoard('jxgbox', {boundingbox: [-5, 5, 5, -5]}),
            cs = [
                [-2, 2, 2, 1], [2, 2, 2, 1], [-2, 2, -2, 1], [2, 2, -2, 1],
                //[0, -2, 0, 1], [0, -2, 0, 1], [0, -2, 0, 1], [0, -2, 0, 1]
                [-2, -2, 2, 1], [2, -2, 2, 1], [-2, -2, -2, 1], [2, -2, -2, 1]
            ],
            ps = [],
            init = function () {
                for (i = 0; i < cs.length; i++) {
                    //co = render(cs[i]);
                    ps[i] = board.create('point', [0, 0], {withLabel: false, trace: false});
                    ps[i].threeD = JXG.Math.Statistics.add(cs[i], [3, 0, 0]);
                }

                // back
                board.create('segment', [ps[0], ps[1]]);
                board.create('segment', [ps[2], ps[3]]);
                board.create('segment', [ps[0], ps[2]]);
                board.create('segment', [ps[1], ps[3]]);

                // front
                board.create('segment', [ps[4], ps[5]]);
                board.create('segment', [ps[6], ps[7]]);
                board.create('segment', [ps[4], ps[6]]);
                board.create('segment', [ps[5], ps[7]]);

                // left
                board.create('segment', [ps[0], ps[4]]);
                board.create('segment', [ps[2], ps[6]]);

                // right
                board.create('segment', [ps[1], ps[5]]);
                board.create('segment', [ps[3], ps[7]]);
            },
            render = function (camera, points) {
                var c = camera.position,//[6, 0, 6],
                    n = camera.normal,//[-2, 0, -2],
                    i, b, nt,
                    nl = Math.sqrt(JXG.Math.innerProduct(n, n)),
                    sgny = Math.abs(n[1]) < JXG.Math.eps ? 0 : (n[1] > 0 ? 1 : -1),
                    phi, theta,
                    rotx, roty, transform;

                theta = 0;//-Math.atan2(n[1], n[2]);
                phi = 0;//-Math.atan2(n[0], n[2]);

                /*if (n[0] > 0) {
                 phi = Math.atan2(n[1], n[0]);
                 } else if (Math.abs(n[0]) < JXG.Math.eps) {
                 phi = sgny*Math.PI/2;
                 } else {
                 phi = Math.atan2(n[1], n[0]) + sgny*Math.PI;
                 }
                 theta = Math.acos(n[2]/nl);*/

                rotx = [
                    [1, 0, 0, 0],
                    [0, Math.cos(theta), -Math.sin(theta), 0],
                    [0, Math.sin(theta), Math.cos(theta), 0],
                    [0, 0, 0, 1]
                ];

                roty = [
                    [Math.cos(phi), 0, Math.sin(phi), 0],
                    [0, 1, 0, 0],
                    [-Math.sin(phi), 0, Math.cos(phi), 0],
                    [0, 0, 0, 1]
                ];

                //transform = JXG.Math.matMatMult(JXG.Math.projection(Math.PI/4, 1, 0.1, 100), JXG.Math.matMatMult(rotx, roty));
                transform = JXG.Math.matMatMult(rotx, roty);
                nt = JXG.Math.matVecMult(transform, JXG.Math.Statistics.subtract(n, c));
                console.log(nt);
                for (i = 0; i < points.length; i++) {
                    b = JXG.Math.matVecMult(transform, JXG.Math.Statistics.subtract(points[i].threeD, c));

                    //points[i].moveTo(b[0], b[1]);

                    points[i].moveTo([Math.abs(nt[2])*b[0]/b[2], Math.abs(nt[2])*b[1]/b[2]]);
                    //points[i].moveTo([nl*b[0]/b[2], nl*b[1]/b[2]]);
                }

                //return ;
            },
            animate = function () {
                render({
                    position: [12*Math.sin(t), 3, 12*Math.cos(t)],
                    normal: [-1*Math.sin(t), 0, -1*Math.cos(t)]
                    //normal: [-1*Math.sin(t)*(2+Math.sin(t)), 0, -1*Math.cos(t)*(2+Math.sin(t))]
                }, ps);
                t += 0.1;
                //if (t > 2*Math.PI) {
//                    t = 0;
//                }
                setTimeout(animate, 100);
                //document.getElementById('debug').innerHTML = t/Math.PI;
            },
            i, co, t = 0;

        init();
        /*render({
         position: [6, 0, 6],
         normal: [-2, 0, -2]
         }, ps);*/

        setTimeout(animate, 100);

        var pmat = JXG.Math.transpose(JXG.Math.projection(Math.PI/4, 1, 0.1, 100));
        var d = document.getElementById("debug");


        d.innerHTML = '';
        for (i = 0; i < pmat.length; i++) {
            for (var j = 0; j < pmat[i].length; j++) {
                d.innerHTML += pmat[i][j];
                d.innerHTML += ', ';
            }
            d.innerHTML += '<br />';
        }

        //board.options.axis.majorHeight = 5;

        //console.log(project([0, 0, 0]), project([1, 0, 0]), project([0, 1, 0]), project([0, 0, 1]));

        // axes
        /*var axp = {
         visible: true,
         withLabel: true,
         face: 'x',
         size: 5,
         strokeWidth: 2,
         strokeColor: 'green'
         },
         axl = {
         withLabel: false,
         strokeColor: 'black',
         strokeWidth: 1,
         lastArrow: true
         },
         o = board.create('point', render([0, 0, 0]), axp),
         p100 = board.create('point', render([2, 0, 0]), axp),
         p010 = board.create('point', render([0, 2, 0]), axp),
         p001 = board.create('point', render([0, 0, 2]), axp),
         xax = board.create('line', [o, p100], axl),
         yax = board.create('line', [o, p010], axl),
         zax = board.create('line', [o, p001], axl);*/
    });

    /* ]]> */
</script>
</body>
</html>