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<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>Multi Segment Reach</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,
target;
while (numSegments--) {
segments.push(new Segment(50, 10));
}
//center the last one
segments[segments.length - 1].x = canvas.width / 2;
segments[segments.length - 1].y = canvas.height / 2;
function reach (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;
return {
x: xpos - w,
y: ypos - h
};
}
function position (segmentA, segmentB) {
segmentA.x = segmentB.getPin().x;
segmentA.y = segmentB.getPin().y;
}
function move (segment, i) {
if (i !== 0) {
target = reach(segment, target.x, target.y);
position(segments[i - 1], segment);
}
}
function draw (segment) {
segment.draw(context);
}
(function drawFrame () {
window.requestAnimationFrame(drawFrame, canvas);
context.clearRect(0, 0, canvas.width, canvas.height);
target = reach(segments[0], mouse.x, mouse.y);
segments.forEach(move);
segments.forEach(draw);
}());
};
</script>
</body>
</html>