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assignment7.html
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<!DOCTYPE html>
<html>
<head>
<title>Assignment 7 - A lonely hermite</title>
<script src="assignment7.js"></script>
</head>
<body>
<table>
<tr>
<td>
<canvas id="canvas1" width="600" height="600">
</td>
<td width="50"></td>
<td valign="top">
This is as far as I could get with hermite splines...
<br>
You can click on the control points to move them.
</td>
</tr>
</table>
<script>
// var a = [[1, 0, 0 ,0], [0, 1, 0, 0], [0, 0, 1, 0], [0, 0, 0, 1]];
// var b = [1, 0, 1, 0];
var canvas = initCanvas('canvas1');
var isClicked = false;
var clickedEl = '';
var controlOne = new Decartes.Control(0.5, 0.5);
var controlTwo = new Decartes.Control(-0.5, -0.5);
hermite = new Decartes.Hermite();
hermite.setPoints(controlOne, controlTwo);
hermite.render(100);
var torus = new Decartes.Sphere().scale(0.2, 0.2, 0.2);
torus.translate(hermite.xPosition[0]*5, hermite.yPosition[0]*5, 0);
var posCount = 0;
var isDecrementing = false;
canvas.update = function(g) {
g.lineWidth = 2;
g.strokeStyle = "black";
hermite.draw(g, canvas.width, canvas.height);
controlOne.draw(g, canvas.width, canvas.height);
controlTwo.draw(g, canvas.width, canvas.height);
if(canvas.cursor.z === 1 && !isClicked){
var distOne = Math.pow((controlOne.positionPoint.canvasCoord[0] - canvas.cursor.x),2) + Math.pow((controlOne.positionPoint.canvasCoord[1] - canvas.cursor.y),2);
var distTwo = Math.pow((controlTwo.positionPoint.canvasCoord[0] - canvas.cursor.x),2) + Math.pow((controlTwo.positionPoint.canvasCoord[1] - canvas.cursor.y),2);
var distThree = Math.pow((controlOne.tangentPoint.canvasCoord[0] - canvas.cursor.x),2) + Math.pow((controlOne.tangentPoint.canvasCoord[1] - canvas.cursor.y),2);
var distFour = Math.pow((controlTwo.tangentPoint.canvasCoord[0] - canvas.cursor.x),2) + Math.pow((controlTwo.tangentPoint.canvasCoord[1] - canvas.cursor.y),2);
if(distOne < 100){
clickedEl = "one";
} else if(distTwo < 100){
clickedEl = "two";
} else if(distThree < 100){
clickedEl = "three";
} else if(distFour < 100){
clickedEl = "four";
} else{
clickedEl = "";
}
isClicked = true;
}
if(canvas.cursor.z === 0){
isClicked = false;
}
if(isClicked) {
switch(clickedEl) {
case "one":
controlOne.updatePosition((canvas.cursor.x - 300)/300, (canvas.cursor.y - 300)/-300);
hermite.setPoints(controlOne, controlTwo);
hermite.render(100);
break;
case "two":
controlTwo.updatePosition((canvas.cursor.x - 300)/300, (canvas.cursor.y - 300)/-300);
hermite.setPoints(controlOne, controlTwo);
hermite.render(100);
break;
case "three":
controlOne.updateTangent((canvas.cursor.x - 300)/300, (canvas.cursor.y - 300)/-300);
hermite.setPoints(controlOne, controlTwo);
hermite.render(100);
break;
case "four":
controlTwo.updateTangent((canvas.cursor.x - 300)/300, (canvas.cursor.y - 300)/-300);
hermite.setPoints(controlOne, controlTwo);
hermite.render(100);
break;
}
}
if(posCount > hermite.xPosition.length){
isDecrementing = true;
} else if (posCount < 0){
isDecrementing = false;
}
torus.matrix = Decartes.Matrix.identity();
torus.scale(0.2, 0.2, 0.2);
torus.translate(hermite.xPosition[posCount]*5, hermite.yPosition[posCount]*5, 0);
torus.draw(g, canvas.width, canvas.height);
if(isDecrementing){
posCount --;
} else {
posCount ++;
}
console.log(posCount);
};
</script>
</body>
</html>