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<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>Multi Segment Drag</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/segment.js"></script>
<script>
window.onload = function () {
var canvas = document.getElementById('canvas'),
context = canvas.getContext('2d'),
mouse = utils.captureMouse(canvas),
segments = [],
numSegments = 5;
while (numSegments--) {
segments.push(new Segment(50, 10));
}
function drag (segment, xpos, ypos) {
var dx = xpos - segment.x,
dy = ypos - segment.y;
segment.rotation = Math.atan2(dy, dx);
var w = segment.getPin().x - segment.x,
h = segment.getPin().y - segment.y;
segment.x = xpos - w;
segment.y = ypos - h;
}
function move (segment, i) {
if (i !== 0) {
drag(segment, segments[i-1].x, segments[i-1].y);
}
}
function draw (segment, i) {
segment.draw(context);
}
(function drawFrame () {
window.requestAnimationFrame(drawFrame, canvas);
context.clearRect(0, 0, canvas.width, canvas.height);
drag(segments[0], mouse.x, mouse.y);
segments.forEach(move);
segments.forEach(draw);
}());
};
</script>
</body>
</html>