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<!doctype html>
<html>
<head>
<title>Halftone</title>
</head>
<body>
<div>
radius <input type="range" min="4" max="20" step="1" value="5" id="radius">
angle <input type="range" min="0" max="90" step="1" value="45" id="angle">
</div>
<div id="images"></div>
</body>
<script type="text/javascript" src="canvasquery.js"></script>
<script type="text/javascript" src="canvasquery.dither.js"></script>
<script type="text/javascript">
var urls = ["abyss.png","building.png","gradient.jpg"]
var imgs = []
var complete = 0
urls.forEach(function(src){
var img = new Image ()
img.onload = ready
img.src = src
imgs.push(img)
if (img.complete) ready()
})
function ready(){
complete += 1
if (complete < imgs.length) return;
document.getElementById("radius").onchange = build
document.getElementById("angle").onchange = build
build()
}
function build(){
document.getElementById("images").innerHTML = ""
imgs.forEach(dither)
}
function dither(img){
var w = img.naturalWidth, h = img.naturalHeight;
var cc = cq(w, h)
var radius = parseFloat(document.getElementById("radius").value)
var angle = parseFloat(document.getElementById("angle").value)
cc.drawImage(img, 0, 0, w, h);
cc.halftone( radius, angle )
cc.appendTo("#images")
}
</script>
</html>
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