Sine and cosine

Animation of the sine and cosine curve.

Click here to start and stop animation.

The underlying JavaScript code

 board = JXG.JSXGraph.initBoard('box', {originX: 250, originY: 250, unitX: 150, unitY: 150});
 board2 = JXG.JSXGraph.initBoard('box2', {originX: 100, originY: 250, unitX: 50, unitY: 150});
 board.createElement('axis', [[0,0], [0,1]]);
 board.createElement('axis', [[0,0], [1,0]]);
 board2.createElement('axis', [[0,0], [1,0]]);
 board2.createElement('axis', [[0,0], [0,1]]);

 b1c1 = board.createElement('circle', ['Ursprung', 'Punkt_1_0']);
 b1p1 = board.createElement('point', [2, 0], {slideObject: b1c1});
 perp = board.createElement('perpendicular', ['X-Achse',b1p1],{strokeColor:['#ff0000',null],visible:[true,false]});
 perp2 = board.createElement('perpendicular',['Y-Achse',b1p1],{strokeColor:['#0000ff',null],visible:[true,false]});

        
 // sine:
 b2p1 = board2.createElement('point', [
             function(){ 
                return board.rad(JXG.GetReferenceFromParameter(board, 'Punkt_1_0'),
                                         JXG.GetReferenceFromParameter(board, 'Ursprung'), b1p1); }, 
             function() { return b1p1.Y() }], 
             {fixed: true, trace: true, strokeColor: '#ff0000', name: 'S'});
 // cosine:
 b2p2 = board2.createElement('point', [
             function(){ return board.rad(JXG.GetReferenceFromParameter(board, 'Punkt_1_0'), 
                                                  JXG.GetReferenceFromParameter(board, 'Ursprung'), b1p1); }, 
             function() { return b1p1.X() }], 
             {fixed: true, trace: true, strokeColor: '#0000ff', name: 'C'});
 // Dependencies (only necessary if b2p1 or b2p2 is deleted)
 b1p1.addChild(b2p1);
 b1p1.addChild(b2p2);
        
 // Animation
 var animated = false;
 function animate(point, direction, count) {
    if(animated) {
       point.stopAnimation();
       animated = false;
    } else {
       point.startAnimation(direction, count);
       animated = true;
    }
 }
</script>