paper
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The Swiss Army Knife of Vector Graphics Scripting
203 lines (183 loc) • 7.76 kB
HTML
<html>
<head>
<meta charset="UTF-8">
<title>Nyan Rainbow</title>
<link rel="stylesheet" href="../css/style.css">
<script type="text/javascript" src="../../dist/paper-full.js"></script>
<script type="text/javascript" src="http://paperjs.org/assets/mediaelement/mediaelement.js"></script>
<script type="text/paperscript" canvas="canvas">
// A tribute to Nyan Cat http://www.youtube.com/watch?v=QH2-TGUlwu4
var mediaElement;
var playing = false;
MediaElement('nyan', {
pluginPath: '/assets/mediaelement/',
success: function(me) {
mediaElement = me;
me.play();
me.addEventListener('timeupdate', function(time) {
if (me.currentTime > 3.7)
playing = true;
});
}
});
var mousePos = view.center + [view.bounds.width / 3, 100];
var position = view.center;
function onFrame(event) {
position += (mousePos - position) / 10;
var vector = (view.center - position) / 10;
moveStars(vector * 3);
moveRainbow(vector, event);
}
function onMouseMove(event) {
mousePos = event.point;
}
function onKeyDown(event) {
if (event.key == 'space')
project.activeLayer.selected = !project.activeLayer.selected;
}
var moveStars = new function() {
// The amount of symbol we want to place;
var count = 50;
// Create a symbol, which we will use to place instances of later:
var path = new Path.Circle({
center: new Point(0, 0),
radius: 5,
fillColor: 'white',
strokeColor: 'black'
});
var symbol = new SymbolDefinition(path);
// Place the instances of the symbol:
for (var i = 0; i < count; i++) {
// The center position is a random point in the view:
var center = Point.random() * view.size;
var placed = symbol.place(center);
placed.scale(i / count + 0.01);
placed.data = {
vector: new Point({
angle: Math.random() * 360,
length : (i / count) * Math.random() / 5
})
};
}
var vector = new Point({
angle: 45,
length: 0
});
function keepInView(item) {
var position = item.position;
var viewBounds = view.bounds;
if (position.isInside(viewBounds))
return;
var itemBounds = item.bounds;
if (position.x > viewBounds.width + 5) {
position.x = -item.bounds.width;
}
if (position.x < -itemBounds.width - 5) {
position.x = viewBounds.width;
}
if (position.y > viewBounds.height + 5) {
position.y = -itemBounds.height;
}
if (position.y < -itemBounds.height - 5) {
position.y = viewBounds.height
}
}
return function(vector) {
// Run through the active layer's children list and change
// the position of the placed symbols:
var layer = project.activeLayer;
for (var i = 0; i < count; i++) {
var item = layer.children[i];
var size = item.bounds.size;
var length = vector.length / 10 * size.width / 10;
item.position += vector.normalize(length) + item.data.vector;
keepInView(item);
}
};
};
var moveRainbow = new function() {
var paths = [];
var colors = ['red', 'orange', 'yellow', 'lime', 'blue', 'purple'];
for (var i = 0; i < colors.length; i++) {
var path = new Path({
fillColor: colors[i]
});
paths.push(path);
}
var count = 30;
var group = new Group(paths);
var headGroup;
var eyePosition = new Point();
var eyeFollow = (Point.random() - 0.5);
var blinkTime = 200;
function createHead(vector, count) {
var eyeVector = (eyePosition - eyeFollow);
eyePosition -= eyeVector / 4;
if (eyeVector.length < 0.00001)
eyeFollow = (Point.random() - 0.5);
if (headGroup)
headGroup.remove();
var top = paths[0].lastSegment.point;
var bottom = paths[paths.length - 1].firstSegment.point;
var radius = (bottom - top).length / 2;
var circle = new Path.Circle({
center: top + (bottom - top) / 2,
radius: radius,
fillColor: 'black'
});
circle.scale(vector.length / 100, 1);
circle.rotate(vector.angle, circle.center);
innerCircle = circle.clone();
innerCircle.scale(0.5);
innerCircle.fillColor = (count % blinkTime < 3)
|| (count % (blinkTime + 5) < 3) ? 'black' : 'white';
if (count % (blinkTime + 40) == 0)
blinkTime = Math.round(Math.random() * 40) + 200;
var eye = circle.clone();
eye.position += eyePosition * radius;
eye.scale(0.15, innerCircle.position);
eye.fillColor = 'black';
headGroup = new Group(circle, innerCircle, eye);
}
return function(vector, event) {
var vector = (view.center - position) / 10;
if (vector.length < 5)
vector.length = 5;
count += vector.length / 100;
group.translate(vector);
var rotated = vector.rotate(90);
var middle = paths.length / 2;
for (var j = 0; j < paths.length; j++) {
var path = paths[j];
var nyanSwing = playing ? Math.sin(event.count / 2) * vector.length : 1;
var unitLength = vector.length * (2 + Math.sin(event.count / 10)) / 2;
var length = (j - middle) * unitLength + nyanSwing;
var top = view.center + rotated.normalize(length);
var bottom = view.center + rotated.normalize(length + unitLength);
path.add(top);
path.insert(0, bottom);
if (path.segments.length > 200) {
var index = Math.round(path.segments.length / 2);
path.segments[index].remove();
path.segments[index - 1].remove();
}
path.smooth();
}
createHead(vector, event.count);
if (mediaElement)
mediaElement.setVolume(vector.length / 200);
}
}
</script>
<style>
body {
background: black;
}
</style>
</head>
<body>
<audio id="nyan" src="http://dl.dropbox.com/u/31703/nyan.mp3" autoplay autobuffer preload=none loop style="display:none"></audio>
<canvas id="canvas" resize hidpi="off"></canvas>
</body>
</html>