paper
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The Swiss Army Knife of Vector Graphics Scripting
81 lines (71 loc) • 2.48 kB
HTML
<html>
<head>
<meta charset="UTF-8">
<title>Radial Rainbows</title>
<link rel="stylesheet" href="../css/style.css">
<script type="text/javascript" src="../../dist/paper-full.js"></script>
<script type="text/paperscript" canvas="canvas">
var point = view.center;
var colors = [];
var cycles = 4;
for (var i = 0, l = 60; i < l; i++) {
var brightness = 1 - (i / l) * 1.5;
var hue = i / l * cycles * 360;
var color = {
hue: hue,
saturation: 1,
brightness: brightness
};
colors.push(color);
}
var path = new Path.Rectangle(view.bounds);
var gradient = new Gradient(colors, true);
var radius = Math.max(view.size.width, view.size.height) * 0.75;
path.fillColor = new Color(gradient, point, point + [radius, 0]);
var gradientColor = path.fillColor;
var mouseDown = false,
mousePoint = view.center;
function onMouseDown(event) {
mouseDown = true;
mousePoint = event.point;
}
function onMouseDrag(event) {
mousePoint = event.point;
}
function onMouseUp(event) {
vector.length = 10;
mouseDown = false;
}
var grow = false;
var vector = new Point(150, 0);
function onFrame() {
for (var i = 0, l = gradient.stops.length; i < l; i++)
gradient.stops[i].color.hue -= 20;
if (grow && vector.length > 300) {
grow = false;
} else if (!grow && vector.length < 75) {
grow = true;
}
if (mouseDown) {
point = point + (mousePoint - point) / 10;
} else {
vector.length += (grow ? 1 : -1);
vector.angle += 5;
}
gradientColor.highlight = mouseDown ? point : point + vector;
}
function onResize(event) {
point = view.center;
path.bounds = view.bounds;
var gradientColor = path.fillColor;
gradientColor.origin = point;
var radius = Math.max(view.size.width, view.size.height) * 0.75;
gradientColor.destination = point + [radius, 0];
}
</script>
</head>
<body>
<canvas id="canvas" hidpi="off" resize></canvas>
</body>
</html>