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<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>Lines 3D 1</title>
<link rel="stylesheet" href="../include/style.css">
</head>
<body>
<header>
Example from <a href="http://amzn.com/1430236655?tag=html5anim-20"><em>Foundation HTML5 Animation with JavaScript</em></a>
</header>
<canvas id="canvas" width="400" height="400"></canvas>
<aside>Move mouse on canvas element.</aside>
<script src="../include/utils.js"></script>
<script src="./classes/ball3d.js"></script>
<script>
window.onload = function () {
var canvas = document.getElementById('canvas'),
context = canvas.getContext('2d'),
mouse = utils.captureMouse(canvas),
balls = [],
numBalls = 15,
fl = 250,
vpX = canvas.width / 2,
vpY = canvas.height / 2,
angleX, angleY;
for (var ball, i = 0; i < numBalls; i++) {
ball = new Ball3d(5, "#000000");
ball.xpos = Math.random() * 200 - 100;
ball.ypos = Math.random() * 200 - 100;
ball.zpos = Math.random() * 200 - 100;
balls.push(ball);
}
function rotateX (ball, angle) {
var cos = Math.cos(angle),
sin = Math.sin(angle),
y1 = ball.ypos * cos - ball.zpos * sin,
z1 = ball.zpos * cos + ball.ypos * sin;
ball.ypos = y1;
ball.zpos = z1;
}
function rotateY (ball, angle) {
var cos = Math.cos(angle),
sin = Math.sin(angle),
x1 = ball.xpos * cos - ball.zpos * sin,
z1 = ball.zpos * cos + ball.xpos * sin;
ball.xpos = x1;
ball.zpos = z1;
}
function setPerspective (ball) {
if (ball.zpos > -fl) {
var scale = fl / (fl + ball.zpos);
ball.scaleX = ball.scaleY = scale;
ball.x = vpX + ball.xpos * scale;
ball.y = vpY + ball.ypos * scale;
ball.visible = true;
} else {
ball.visible = false;
}
}
function move (ball, i) {
rotateX(ball, angleX);
rotateY(ball, angleY);
setPerspective(ball);
//don't draw line to first ball
if (i !== 0) {
context.lineTo(balls[i].x, balls[i].y);
}
}
function draw (ball) {
if (ball.visible) {
ball.draw(context);
}
}
(function drawFrame () {
window.requestAnimationFrame(drawFrame, canvas);
context.clearRect(0, 0, canvas.width, canvas.height);
angleX = (mouse.y - vpY) * 0.001;
angleY = (mouse.x - vpX) * 0.001;
context.beginPath();
//line starts at first ball
context.moveTo(balls[0].x, balls[0].y);
balls.forEach(move);
context.stroke();
balls.forEach(draw);
}());
};
</script>
</body>
</html>