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pointillize.html
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pointillize.html
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<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>Video Frames</title>
<link rel="stylesheet" href="style.css">
<style>
#movieclip {
display: none;
}
</style>
</head>
<body>
<header>Avoid cross domain security error. $ http-server -p 8000 </header>
<canvas id="canvas" width="600" height="360"></canvas>
<input id="radius" type="range" value="5" min="1" max="20" step="1"/>
<input id="density" type="range" value="0.75" min="0" max="5.0" step="0.1"/>
<input id="noise" type="range" value="0.8" min="0.0" max="2.0" step="0.1"/>
<input id="transparent" type="checkbox"/>
<video id="movieclip" width="640" height="360" autoplay>
<source src="./assets/movieclip.mp4" type="video/mp4"/>
<source src="./assets/movieclip.webm" type="video/webm"/>
<source src="./assets/movieclip.ogv" type="video/ogg"/>
</video>
<script src="utils.js"></script>
<script src="Stats.js"></script>
<script src="camera.js"></script>
<script>
window.onload = function () {
var canvas = document.getElementById('canvas'),
context = canvas.getContext('2d'),
copyCanvas = createCopyCanvas(canvas),
copyContext = copyCanvas.getContext('2d'),
video = document.getElementById('movieclip'),
stats = Stat.initStats();
Camera.createPlayButton(video);
function createCopyCanvas (canvas) {
var copy = document.createElement('canvas');
copy.width = canvas.width;
copy.height = canvas.height;
return copy;
}
function pointillize (context, copyContext, radius, density, noise, transparent) {
radius = Math.max(1, radius);
density = Math.min(5, density);
noise = Math.max(0, noise);
var h = canvas.height,
w = canvas.width,
w4 = w*4,
diameter = radius * 2,
noiseRadius = radius * noise,
dist = 1 / density;
if (transparent) {
context.clearRect(0, 0, w, h);
context.drawImage(
copyCanvas,
0, 0, w, h,
0, 0, w, h
);
}
for (var y = 0; y < h+radius; y += diameter * dist) {
for (var x = 0; x < w+radius; x += diameter * dist) {
rndX = noise ? (x+((Math.random()*2-1) * noiseRadius))>>0 : x;
rndY = noise ? (y+((Math.random()*2-1) * noiseRadius))>>0 : y;
var pixX = rndX - radius;
var pixY = rndY - radius;
if (pixX < 0) pixX = 0;
if (pixY < 0) pixY = 0;
var cx = rndX + 0;
var cy = rndY + 0;
if (cx < 0) cx = 0;
if (cx > w) cx = w;
if (cy < 0) cy = 0;
if (cy > h) cy = h;
var diameterX = diameter;
var diameterY = diameter;
if (diameterX + pixX > w)
diameterX = w - pixX;
if (diameterY + pixY > h)
diameterY = h - pixY;
if (diameterX < 1) diameterX = 1;
if (diameterY < 1) diameterY = 1;
var data = copyContext.getImageData(pixX, pixY, diameterX, diameterY).data;
context.fillStyle = "rgb(" + data[0] + "," + data[1] + "," + data[2] + ")";
context.beginPath();
context.arc(cx, cy, radius, 0, Math.PI*2, true);
context.closePath();
context.fill();
}
}
}
(function drawFrame () {
stats.begin();
window.requestAnimationFrame(drawFrame, canvas);
canvas.width = video.videoWidth;
canvas.height = video.videoHeight;
copyContext.drawImage(video, 0, 0);
var radius = parseInt(document.getElementById('radius').value, 10) || 1,
density = parseFloat(document.getElementById('density').value, 10) || 0.0,
noise = parseFloat(document.getElementById('noise').value, 10) || 0.0,
transparent = document.getElementById('transparent').checked;
pointillize(context, copyContext, radius, density, noise, transparent);
stats.end();
}());
};
</script>
</body>
</html>