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rhill-voronoi-demo3.php
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rhill-voronoi-demo3.php
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<!DOCTYPE html>
<html>
<head>
<style type="text/css">
body {font-family:tahoma,verdana,arial;font-size:13px;margin:0;padding:0}
body > div {margin-left:4px;margin-right:4px;}
body > div > div {margin:0;border:1px solid #ccc;border-top:0;padding:4px;}
div.pane {margin:0;border:0;padding:0;display:inline-block;vertical-align:top}
h1 {margin:0 0 0.5em 0;padding: 4px 5em 4px 4px;font:bold large sans-serif;background-color:#c9d7f1;}
h4 {font-size:14px;margin:0;border:0;border-bottom:solid 1px #c9d7f1;padding:2px;background-color:#e5ecf9;}
h4 > span {cursor:pointer}
#voronoiGenerators {font-size:12px}
#voronoiGenerators input,#voronoiGenerators button {font-size:inherit}
.tileParms {margin-bottom:1em;vertical-align:bottom}
.tileParms > div {margin:0;border:0;padding:0}
.tileParms input {margin-top:2px;border:1px solid gray;width:60px;height:14px}
div.colorValues {margin:2px 0 2px 15px}
div.colorValues > img {vertical-align:bottom}
div.hLegend,div.repeatValues,div.offsetValues,div.rotateValues {display:inline-block;vertical-align:bottom}
div.hLegend {width:12px}
div.hLegend > span {margin-top:2px;padding:0 0 2px 0;display:block;height:14px;text-align:right}
div.repeatValues > div,div.offsetValues > div,div.rotateValues > div {border:1px solid #888;height:60px;position:relative;color:#aaa;text-align:center;line-height:60px}
div.repeatValues > div,div.offsetValues > div {width:60px}
div.rotateValues > div {width:25px}
div.repeatValues > div > div,div.offsetValues > div > div,div.rotateValues > div > div {border:0;position:absolute;left:0;top:0}
div.repeatValues > div > div,div.offsetValues > div > div {width:10px;height:10px;background:url('knob-dragger.png') no-repeat}
div.rotateValues > div > div {width:25px;height:5px;background:url('knob-slider.png') no-repeat}
div.rotateValues > input {width:25px;}
#canvasParent {margin-top:0;margin-bottom:1em;padding:0;border:0}
#voronoiCode {font:11px monospace;overflow:auto;color:gray;}
#voronoiCode span {color:green;font-weight:bold;}
</style>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<title>Javascript implementation of Steven Fortune's algorithm to compute Voronoi diagrams: Demo 3</title>
<meta name="Keywords" lang="en" content="voronoi, fortune, javascript, raymond hill"/>
<script type="text/javascript" src="mootools/mootools-core-1.3.2.js"></script>
<script type="text/javascript" src="mootools/mootools-more-1.3.2.1.js"></script>
<!--[if lte IE 8]>
<script type="text/javascript" src="excanvas/excanvas.compiled.js"></script>
<![endif]-->
<script type="text/javascript" src="rhill-voronoi-core.min.js"></script>
<?php
if ( isset($_REQUEST['generators']) && preg_match('/^([0-9a-fA-F]+(-|$))+$/', $_REQUEST['generators']) ) {
$match = explode('-', $_REQUEST['generators']);
if ( (count($match) % 3) == 0 ) {
$tiles = array();
$valuesPerTiles = count($match) / 3;
if ( $valuesPerTiles >= 6 && $valuesPerTiles <= 8 ) {
for ( $iTile = 0; $iTile < 3; $iTile++ ) {
$index = $iTile * $valuesPerTiles;
$xstep = min(max(hexdec($match[$index++]),0),50);
$ystep = min(max(hexdec($match[$index++]),0),50);
$xoffset = min(max(hexdec($match[$index++]) / 1000 - 0.5,-0.5),0.5);
$yoffset = min(max(hexdec($match[$index++]) / 1000 - 0.5,-0.5),0.5);
$angle = $valuesPerTiles != 7 ? min(max(hexdec($match[$index++])/1000,0),1) : 0;
$tile = "repeatx:{$xstep}, repeaty:{$ystep}, offsetx:{$xoffset}, offsety:{$yoffset}, rotate:{$angle}";
if ( preg_match('/^[0-9a-fA-F]{6}$/', $match[$index]) ) {
$tile .= ", color:'#{$match[$index]}'";
}
$tiles[] = "{{$tile}}";
}
$preset = '[' . implode(',', $tiles) . ']';
}
}
}
?>
<script type="text/javascript">
<!--
// Copyright 2011 Raymond Hill
// MIT license
var VoronoiDemo = {
voronoi: new Voronoi(),
sites: [],
diagram: null,
canvas: null,
generators: [],
backgroundGenerator: null,
dragging: false,
hasRotation: false,
showGrout: true,
showSites: false,
controls: [],
presets: [
[
{repeatx:10, repeaty:10},
{repeatx:5, repeaty:5, offsetx:0.5, offsety:0.5},
{repeatx:5, repeaty:5}
],
[
{repeatx:7, repeaty:12},
{repeatx:7, repeaty:12, offsetx:0.5, offsety:0.5}
],
[
{repeatx:10, repeaty:10, offsetx:-0.5, offsety:-0.5},
{repeatx:5, repeaty:5, offsetx:0.5, offsety:0.5},
{repeatx:5, repeaty:5}
],
[
{repeatx:10, repeaty:10},
{repeatx:10, repeaty:10, offsetx:0.5, offsety:0.5}
],
[
{repeatx:9, repeaty:11, color:'#ffccaa'},
{repeatx:10, repeaty:10, color:'#ccaa88'}
],
[
{repeatx:24, repeaty:24, rotate:0.25, color:'#ffccaa'},
{repeatx:24, repeaty:24, color:'#ccaa88'}
],
[
{repeatx:9, repeaty:12},
{repeatx:8, repeaty:11, offsetx:0.5, offsety:0.5},
{repeatx:7, repeaty:7}
],
[
{repeatx:1, repeaty:20},
{repeatx:2, repeaty:2, offsetx:0.5, offsety:0.5},
{repeatx:2, repeaty:2}
],
[
{repeatx:10, repeaty:5, offsety:0.5},
{repeatx:5, repeaty:5, offsetx:0.5, offsety:0.5},
{repeatx:5, repeaty:5}
],
[
{repeatx:20, repeaty:20, color:'#efe4b0'},
{repeatx:21, repeaty:21, color:'#b5e61d'},
{repeatx:22, repeaty:22, color:'#c8bfe7'}
]
],
<?php if ( isset($preset) ) { echo "urlpreset: {$preset},\n"; } ?>
init: function() {
var demo = this;
this.canvasWidth = this.canvasHeight = 640;
this.canvas = $('voronoiCanvas');
this.canvas.width = this.canvas.height = this.canvasWidth;
/*
this.canvasPattern = $('canvasPattern');
this.canvasPattern.width = this.canvasPattern.height = this.canvasWidth / 4;
this.canvasPreview = $('canvasTilingPreview');
this.canvasPreview.width = this.canvasPreview.height = this.canvasWidth;
*/
this.generators.push(this.createGenerator([255,128,128]));
this.generators.push(this.createGenerator([128,255,128]));
this.generators.push(this.createGenerator([128,128,255]));
// GUI stuff
var handleColorChange = function(iGenerator, newColor) {
var generator = demo.generators[iGenerator];
if (/^#?([0-9a-fA-F]|([0-9a-fA-F]{2})){3}$/.test(newColor)) {
if (!/^#/.test(newColor)) {
newColor = '#' + newColor;
}
generator.color = newColor.hexToRgb(true);
}
generator.render();
demo.renderVoronoi();
demo.renderCanvas();
demo.syncFields(iGenerator);
demo.updatePermalink();
};
var handleValueChange = function(iGenerator, member, value) {
if (isNaN(value)) {value=0;}
var generator = demo.generators[iGenerator];
generator[member] = value;
generator.render();
demo.renderVoronoi();
demo.renderCanvas();
demo.syncFields(iGenerator);
demo.updatePermalink();
};
var handleStepChange = function(el,iGenerator,member) {
handleValueChange(iGenerator,member,Math.min(Math.max(parseInt(el.value,10),0),50));
};
var handleOffsetChange = function(el,iGenerator,member) {
handleValueChange(iGenerator,member,Math.min(Math.max(parseFloat(el.value),-0.5),0.5));
};
var handleAngleChange = function(el,iGenerator,member) {
handleValueChange(iGenerator,member,Math.min(Math.max(parseFloat(el.value),0),1));
};
var handleStepDragger = function(el,iGenerator) {
var coords = el.getCoordinates(el.getOffsetParent()),
generator = demo.generators[iGenerator],
hadTiles = generator.repeatx && generator.repeaty;
generator.repeatx = coords.left;
generator.repeaty = coords.top;
var hasTiles = generator.repeatx && generator.repeaty;
generator.render();
demo.syncTextFields(iGenerator, 'repeat');
if (hadTiles || hasTiles) {
demo.renderVoronoi();
demo.renderCanvas();
}
};
var handleOffsetDragger = function(el,iGenerator) {
var coords = el.getCoordinates(el.getOffsetParent()),
generator = demo.generators[iGenerator],
hasTiles = generator.repeatx && generator.repeaty;
generator.offsetx = coords.left / 50 - 0.5;
generator.offsety = coords.top / 50 - 0.5;
generator.render();
demo.syncTextFields(iGenerator, 'offset');
if (hasTiles) {
demo.renderVoronoi();
demo.renderCanvas();
}
};
var handleRotationDragger = function(el,iGenerator) {
var coords = el.getCoordinates(el.getOffsetParent()),
generator = demo.generators[iGenerator],
hasTiles = generator.repeatx && generator.repeaty;
generator.rotate = coords.top / 55;
generator.render();
demo.syncTextFields(iGenerator, 'rotate');
if (hasTiles) {
demo.renderVoronoi();
demo.renderCanvas();
}
};
$$('#voronoiGenerators .tileParms').each(function(el,iGenerator){
var controls = {
color: el.getElement('.colorValues > input'),
repeatx: el.getElement('.repeatValues > input:nth-of-type(1)'),
repeaty: el.getElement('.repeatValues > input:nth-of-type(2)'),
offsetx: el.getElement('.offsetValues > input:nth-of-type(1)'),
offsety: el.getElement('.offsetValues > input:nth-of-type(2)'),
rotate: el.getElement('.rotateValues > input:nth-of-type(1)'),
repeatKnob: el.getElement('.repeatValues > div > div'),
offsetKnob: el.getElement('.offsetValues > div > div'),
rotateKnob: el.getElement('.rotateValues > div > div')
};
demo.controls[iGenerator] = controls;
var dummy = new Drag(el.getElement(controls.repeatKnob), {
snap: 1,
limit:{x:[0,50],y:[0,50]},
onStart: function(){demo.dragging=true;},
onDrag: function(el){
handleStepDragger(el,iGenerator);
},
onComplete: function(){
demo.dragging=false;
demo.renderCanvas();
demo.updatePermalink();
}
});
dummy = new Drag(el.getElement(controls.offsetKnob), {
snap: 1,
limit:{x:[0,50],y:[0,50]},
onStart: function(){demo.dragging=true;},
onDrag: function(el){
handleOffsetDragger(el,iGenerator);
},
onComplete: function(){
demo.dragging=false;
demo.renderCanvas();
demo.updatePermalink();
}
});
dummy = new Drag(el.getElement(controls.rotateKnob), {
snap: 1,
limit:{x:[0,0],y:[0,55]},
onStart: function(){demo.dragging=true;},
onDrag: function(el){
handleRotationDragger(el,iGenerator);
},
onComplete: function(){
demo.dragging=false;
demo.renderCanvas();
demo.updatePermalink();
}
});
controls.color.addEvent('change',function(){handleColorChange(iGenerator,this.value);});
controls.repeatx.addEvent('change',function(){handleStepChange(this,iGenerator,'repeatx');});
controls.repeaty.addEvent('change',function(){handleStepChange(this,iGenerator,'repeaty');});
controls.offsetx.addEvent('change', function(){handleOffsetChange(this,iGenerator,'offsetx');});
controls.offsety.addEvent('change', function(){handleOffsetChange(this,iGenerator,'offsety');});
controls.rotate.addEvent('change', function(){handleAngleChange(this,iGenerator,'rotate');});
});
// global controls
$('showGrout').addEvent('change',function(){
demo.showGrout=this.checked;
demo.renderCanvas();
});
$('showSites').addEvent('change',function(){
demo.showSites=this.checked;
demo.renderCanvas();
});
// initalize UI as per internal state
this.selectPreset(this.urlpreset || this.presets[0]);
this.syncFields();
this.renderVoronoi();
this.renderCanvas();
this.updatePermalink();
},
renderVoronoi: function() {
this.compositeGenerators();
this.diagram = this.voronoi.compute(this.sites, {xl:0,xr:this.canvas.width,yt:0,yb:this.canvas.height});
},
renderCanvas: function() {
var ctx = this.canvas.getContext('2d'),
backgroundGenerator = this.backgroundGenerator;
// background
ctx.globalAlpha = 1;
ctx.beginPath();
ctx.rect(0,0,this.canvas.width,this.canvas.height);
ctx.fillStyle = this.hasRotation || !backgroundGenerator ? '#fff' : backgroundGenerator.color.rgbToHex();
ctx.fill();
// voronoi
if (!this.diagram) {return;}
ctx.save();
// disk-like canvas if at least one rotation is applied: this
// because the canvas is not 'tilable' whenever at least one generator
// has a non-zero rotation value
if (this.hasRotation) {
ctx.beginPath();
ctx.arc(this.canvas.width/2,this.canvas.height/2, this.canvas.width/2, 0, 2*Math.PI, false);
ctx.clip();
if (backgroundGenerator) {
ctx.fillStyle = backgroundGenerator.color.rgbToHex();
ctx.fill();
}
}
ctx.lineWidth = 0.5;
ctx.strokeStyle = '#888';
var cells = this.diagram.cells,
iCell = cells.length,
cell,
halfedges, nHalfedges, iHalfedge, v,
showGrout = !this.dragging && this.showGrout,
showSites = this.showSites,
mustFill;
while (iCell--) {
cell = cells[iCell];
halfedges = cell.halfedges;
nHalfedges = halfedges.length;
if (nHalfedges) {
mustFill = !backgroundGenerator || backgroundGenerator !== cell.site.generator;
if (showGrout || mustFill) {
v = halfedges[0].getStartpoint();
ctx.beginPath();
ctx.moveTo(v.x,v.y);
for (iHalfedge=0; iHalfedge<nHalfedges; iHalfedge++) {
v = halfedges[iHalfedge].getEndpoint();
ctx.lineTo(v.x,v.y);
}
if (mustFill) {
ctx.fillStyle = cell.site.color.rgbToHex();
ctx.fill();
}
if (showGrout) {
ctx.stroke();
}
}
if (showSites) {
ctx.fillStyle = 'black';
ctx.fillRect(cell.site.x-0.5,cell.site.y-0.5,1.5,1.5);
}
}
}
ctx.restore();
/* // bird's view tiling
if (!this.dragging) {
ctx = this.canvasPattern.getContext('2d');
ctx.drawImage(this.canvas,0,0,this.canvasPattern.width,this.canvasPattern.height)
ctx = this.canvasPreview.getContext('2d');
var pattern = ctx.createPattern(this.canvasPattern,'repeat')
ctx.fillStyle = pattern;
ctx.fillRect(0,0,this.canvasPreview.width,this.canvasPreview.height);
}
*/ },
createGenerator: function(color) {
var generator = {
repeatx: 0,
repeaty: 0,
offsetx: 0,
offsety: 0,
rotate: 0,
color: color,
sites: [],
render: function() {
this.sites = [];
if (!this.repeatx || !this.repeaty) {return;}
var sites = this.sites,
yinc = 1/this.repeaty,
ystep = this.repeaty + 2,
yoffset = this.offsety * yinc,
yin = -yinc,
xinc = 1/this.repeatx,
xstep,
xoffset = this.offsetx * xinc,
xin,
xout, yout,
radian = this.rotate*Math.PI,
cosfactor = Math.cos(radian),
sinfactor = Math.sin(radian),
xtransient, ytransient;
while (ystep-- > 0) {
xin = -xinc;
xstep = this.repeatx + 2;
radius = Math.sqrt(yinc*yinc+xinc*xinc) / 2;
while (xstep-- > 0) {
xout = xin + xoffset;
yout = yin + yoffset;
if (radian) {
xtransient = xout - 0.5; // bring center to origin
ytransient = yout - 0.5;
xout = xtransient*cosfactor - ytransient*sinfactor + 0.5;
yout = xtransient*sinfactor + ytransient*cosfactor + 0.5;
}
sites.push({x:xout, y:yout, color:this.color});
xin += xinc;
}
yin += yinc;
}
}
};
return generator;
},
compositeGenerators: function() {
this.sites = [];
this.hasRotation = false;
var w = this.canvas.width,
h = this.canvas.height,
sitemap = {},
generators = this.generators,
nGenerators = generators.length,
iGenerator, generator,
backgroundGenerator,
sites, nSites, iSite, site,
sitecolor, sitekey,
x, y;
for (iGenerator = 0; iGenerator<nGenerators; iGenerator++) {
generator = generators[iGenerator];
sites = generator.sites;
nSites = generator.sites.length;
if (!backgroundGenerator || nSites>backgroundGenerator.sites.length) {
backgroundGenerator = generator;
}
for (iSite = 0; iSite<nSites; iSite++) {
site = sites[iSite];
x = site.x;
y = site.y;
// ~~(a+0.5) == Math.round(a)
// as per http://jsperf.com/math-round-vs-hack/3 ~~ is likely faster
// as of now. It matters here since we could be in an interactive loop
x = (~~(w*x*100+0.5))/100;
y = (~~(h*y*100+0.5))/100;
sitekey = x * 10000 + y; // 10000, or whatever is safely over w and h
if (sitemap[sitekey]) {
// color mix = additive
sitecolor = sitemap[sitekey].color.slice(0);
sitecolor[0] = Math.max(sitecolor[0], generator.color[0]);
sitecolor[1] = Math.max(sitecolor[1], generator.color[1]);
sitecolor[2] = Math.max(sitecolor[2], generator.color[2]);
sitemap[sitekey].color = sitecolor;
sitemap[sitekey].generator = null;
}
else {
site = {x:x, y:y, color:generator.color, generator:generator};
sitemap[sitekey] = site;
this.sites.push(site);
}
}
this.hasRotation = this.hasRotation || (generator.rotate && generator.repeatx && generator.repeaty);
}
this.backgroundGenerator = backgroundGenerator;
},
syncTextFields: function(whichGenerator, whichControl) {
var generators = this.generators,
nGenerators = generators.length,
iGenerator, generator, controls;
for (iGenerator=0; iGenerator<nGenerators; iGenerator++) {
generator = generators[iGenerator];
if (whichGenerator === undefined || iGenerator === whichGenerator) {
controls = this.controls[iGenerator];
if (!whichControl || /^color/.test(whichControl)) {
controls.color.value = generator.color.rgbToHex();
controls.repeatKnob.style.backgroundColor =
controls.offsetKnob.style.backgroundColor =
controls.rotateKnob.style.backgroundColor = controls.color.value;
}
if (!whichControl || /^repeat/.test(whichControl) ) {
controls.repeatx.value = generator.repeatx;
controls.repeaty.value = generator.repeaty;
}
if (!whichControl || /^(offset|rotate)/.test(whichControl) ) {
controls.offsetx.value = generator.offsetx.toFixed(3);
controls.offsety.value = generator.offsety.toFixed(3);
controls.rotate.value = generator.rotate.toFixed(3);
}
}
}
},
syncDragFields: function(which) {
var generators = this.generators,
nGenerators = generators.length,
iGenerator, generator, knob;
for (iGenerator=0; iGenerator<nGenerators; iGenerator++) {
if (which === undefined || iGenerator === which) {
generator = generators[iGenerator];
knob = this.controls[iGenerator].repeatKnob;
knob.style.left = generator.repeatx + 'px';
knob.style.top = generator.repeaty + 'px';
knob = this.controls[iGenerator].offsetKnob;
knob.style.left = String(Math.floor((generator.offsetx + 0.5) * 50)) + 'px';
knob.style.top = String(Math.floor((generator.offsety + 0.5) * 50)) + 'px';
knob = this.controls[iGenerator].rotateKnob;
knob.style.top = String(Math.floor((generator.rotate) * 55)) + 'px';
}
}
},
syncFields: function(which) {
this.syncTextFields(which);
this.syncDragFields(which);
},
selectPreset: function(preset) {
var nGenerators = this.generators.length,
iGenerator, generator, preset_generator,
defaultColors = ['#ff8080','#80ff80','#8080ff'];
for (iGenerator=0; iGenerator<nGenerators; iGenerator++) {
generator = this.generators[iGenerator];
preset_generator = preset[iGenerator] || {};
generator.repeatx = preset_generator.repeatx || 0;
generator.repeaty = preset_generator.repeaty || 0;
generator.offsetx = preset_generator.offsetx || 0;
generator.offsety = preset_generator.offsety || 0;
generator.rotate = preset_generator.rotate || 0;
generator.color = (preset_generator.color || defaultColors[iGenerator] || '#999999').hexToRgb(true);
generator.render();
}
this.syncFields();
this.renderVoronoi();
this.renderCanvas();
this.updatePermalink();
},
updatePermalink: function(){
var query = [],
generators = this.generators,
nGenerators = generators.length,
iGenerator, generator;
for (iGenerator=0; iGenerator<nGenerators; iGenerator++) {
generator = generators[iGenerator];
query.push(generator.repeatx.toString(16));
query.push(generator.repeaty.toString(16));
query.push(Math.round((generator.offsetx+0.5)*1000).toString(16));
query.push(Math.round((generator.offsety+0.5)*1000).toString(16));
query.push(Math.round((generator.rotate)*1000).toString(16));
query.push(generator.color.rgbToHex().substr(1));
}
var permalink = location.protocol+'//'+location.host+location.pathname+'?generators='+query.join('-');
var el = $('permalink');
el.innerHTML = permalink;
el.href = permalink;
}
};
window.addEvent('domready',function(){VoronoiDemo.init();});
// -->
</script>
</head>
<body>
<a href="https://github.com/gorhill/Javascript-Voronoi"><img style="position: absolute; top: 0; right: 0; border: 0;" src="https://s3.amazonaws.com/github/ribbons/forkme_right_red_aa0000.png" alt="Fork me on GitHub"></a>
<h1>Javascript implementation of Steven Fortune's algorithm to compute Voronoi diagrams<br/>Demo 3: Fancy tiling</h1>
<div id="divroot">
<p style="margin-top:0;margin-bottom:0"><a href="/voronoi/rhill-voronoi.html">< Back to main page</a><ul style="margin-top:0">
<li><a href="rhill-voronoi-demo1.html">Demo 1: measuring peformance</a>
<li><a href="rhill-voronoi-demo2.html">Demo 2: a bit of interactivity</a>
<li><b>Demo 3: Fancy tiling</b>
<li><a href="rhill-voronoi-demo4.html">Demo 4: Looking up a Voronoi cell using a quadtree</a>
<li><a href="rhill-voronoi-demo5.html">Demo 5: Lloyd's relaxation</a>
<li><a href="http://www.raymondhill.net/blog/?p=458#comments">Comments</a>
</ul></p>
<div class="pane" id="canvasParent">
<h4 class="divhdr">Canvas</h4>
<noscript>You need to enable Javascript in your browser for this page to display properly.</noscript>
<canvas id="voronoiCanvas" style="cursor:crosshair" width="640" height="640"></canvas>
<div id="voronoiNoCanvasAlert" style="display:none;padding:1em;background-color:#fcc;color:black;">
<p>Your browser doesn't support the HTML5 <canvas> element technology.</p>
<p>See <a target="_blank" href="http://en.wikipedia.org/wiki/Canvas_(HTML_element)">Wikipedia</a> for information on which browsers support the <u>HTML5 <canvas></u> technology.</p>
</div>
</div>
<div class="pane" id="voronoiGenerators">
<h4 class="divhdr">1st-degree generators</h4>
<span style="margin-bottom:0.5em;display:inline-block;width:160px;font-size:xx-small;color:gray">(This page works best on latest <a style="color:inherit" href="http://www.opera.com/browser/">Opera browser</a>: I measured fastest execution + it natively supports HTML5 color picker)</span>
<div class="tileParms">
<div class="colorValues">
Color: <input type="color" value="#ff8080"> <a target="_blank" href="http://www.html5tutorial.info/html5-color.php">?</a>
</div>
<div class="hLegend">
<span>h</span>
<span>v</span>
</div>
<div class="repeatValues">
<div>Steps<div style="background-color:#f77;"></div></div>
<input type="text" size="6"><br>
<input type="text" size="6">
</div>
<div class="offsetValues">
<div>Offset<div style="background-color:#f77;"></div></div>
<input type="text" size="6"><br>
<input type="text" size="6">
</div>
<div class="rotateValues">
<div>Rot<div style="background-color:#f77;"></div></div>
<input type="text" size="6"><br>
<input type="text" size="6" style="visibility:hidden">
</div>
</div>
<div class="tileParms">
<div class="colorValues">
Color: <input type="color" value="#80ff80">
</div>
<div class="hLegend">
<span>h</span>
<span>v</span>
</div>
<div class="repeatValues">
<div><div style="background-color:#7f7;"></div>Steps</div>
<input type="text" size="6"><br>
<input type="text" size="6">
</div>
<div class="offsetValues">
<div><div style="background-color:#7f7;"></div>Offset</div>
<input type="text" size="6"><br>
<input type="text" size="6">
</div>
<div class="rotateValues">
<div><div style="background-color:#7f7;"></div>Rot</div>
<input type="text" size="6"><br>
<input type="text" size="6" style="visibility:hidden">
</div>
</div>
<div class="tileParms">
<div class="colorValues">
Color: <input type="color" value="#8080ff">
</div>
<div class="hLegend">
<span>h</span>
<span>v</span>
</div>
<div class="repeatValues">
<div><div style="background-color:#77f;"></div>Steps</div>
<input type="text" size="6"><br>
<input type="text" size="6">
</div>
<div class="offsetValues">
<div><div style="background-color:#77f;"></div>Offset</div>
<input type="text" size="6"><br>
<input type="text" size="6">
</div>
<div class="rotateValues">
<div><div style="background-color:#77f;"></div>Rot</div>
<input type="text" size="6"><br>
<input type="text" size="6" style="visibility:hidden">
</div>
</div>
<div style="margin-top:1em">
<input id="showGrout" type="checkbox" checked="checked" value="">Show grout<br>
<input id="showSites" type="checkbox" value="">Show Voronoi sites
</div>
<div style="margin-top:1em">
Presets:<br>
<script type="text/javascript">
<!--
(function(){
for (var i=0; i<VoronoiDemo.presets.length; i++) {
document.write('<button onclick="VoronoiDemo.selectPreset(VoronoiDemo.presets['+i+']);">'+String(i+1)+'</button>');
document.write((i+1) % 3 ? ' ' : '<br>');
}
if (VoronoiDemo.urlpreset) {
document.write('<button onclick="VoronoiDemo.selectPreset(VoronoiDemo.urlpreset);">URL</button>');
}
}());
// -->
</script>
</div>
</div>
</div>
<div>
<h4>Permalink for the above Voronoi diagram</h4>
<p style="margin-top:0.5em"><a id="permalink" href="#"></a></p>
</div>
<!--
<div>
<h4>Tiling preview</h4>
<canvas id="canvasPattern" style="display:none;width:100px;height:100px;"></canvas>
<canvas id="canvasTilingPreview" style="width:640px;height:640px;"></canvas>
</div>
-->
<div>
<h4>Export as SVG</h4>
<p style="margin-top:0.5em">Coming soon (I guess...)</p>
</div>
<div>
<h4>Further reading</h4>
<p style="margin-top:0.5em"><a href="http://www.cs.washington.edu/homes/csk/tile/papers/kaplan_isama1999.pdf">Voronoi diagrams and ornamental design (PDF file)</a> by Craig S. Kaplan.<br><a href="http://www.josleys.com/show_gallery.php?galid=284">Mathematical imagery</a> by Jos Leys.</p>
</div>
</body>
</html>