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index.htm
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<!--
voronoi.htm
Voronoi SVG generator
2012-10-23
By STG, http://wiki.forskningsavd.se/User:Stg
License: X11/MIT
Uses a voronoi algorithm by Raymond Hill and a file saving library by Eli Grey
See corresponding .js files for more information
-->
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:svg="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" xml:lang="en" lang="en">
<head>
<meta charset="UTF-8" />
<title>STG - Voronoi SVG generator</title>
<script src="rhill-voronoi-core.js"></script>
<script src="FileSaver.js"></script>
<script src="BlobBuilder.js"></script>
<script>
// Configuration
var size_w = 800;
var size_h = 450;
var seed_count = 10;
var seeds;
var shift = false;
var best_seed = 0;
var timeout;
var inside = false, last_x = -1, last_y = -1;
var svgDocument;
function Vertex(x, y) {
this.x = x;
this.y = y;
}
function init() {
// Create random seeds
seeds = new Array();
add_random();
// Initialize SVG
svgDocument = document.getElementById("svgSurface");
// Start renderer
render();
}
function render() {
// Fetch rendering parameters
var size_factor = 1.0 - (parseIntOr(document.getElementById("r_vertex").value, 0) / 100);
var edge_factor = 1.0 - (parseIntOr(document.getElementById("r_bezier").value, 0) / 100);
var join_factor = (parseIntOr(document.getElementById("r_reduce").value, 0) / 100);
// Clear SVG
svgDocument.style.width = size_w;
svgDocument.style.height = size_h;
while(svgDocument.childNodes.length) {
svgDocument.removeChild(svgDocument.childNodes[0]);
}
var shape = document.createElementNS("http://www.w3.org/2000/svg", "rect");
shape.setAttributeNS(null, "x", 0);
shape.setAttributeNS(null, "y", 0);
shape.setAttributeNS(null, "width", size_w);
shape.setAttributeNS(null, "height", size_h);
shape.setAttributeNS(null, "fill", "white");
svgDocument.appendChild(shape);
try {
// Create voronoi map
var bbox = {xl:0, xr:size_w, yt:0, yb:size_h};
var voronoi = new Voronoi();
var result = voronoi.compute(seeds, bbox);
var polys = new Array();
// Convert to polygon array
for(var cell = 0; cell < result.cells.length; cell++) {
polys[cell] = new Array();
polys[cell][0] = new Vertex(
result.cells[cell].halfedges[0].getStartpoint().x,
result.cells[cell].halfedges[0].getStartpoint().y
)
for(var edge = 0; edge < result.cells[cell].halfedges.length - 1; edge++) {
polys[cell][edge + 1] = new Vertex(
result.cells[cell].halfedges[edge].getEndpoint().x,
result.cells[cell].halfedges[edge].getEndpoint().y
)
}
}
/*
// Straight render
var svgDocument = document.getElementById("svgSurface");
for(var poly = 0; poly < polys.length; poly++) {
var shape = document.createElementNS("http://www.w3.org/2000/svg", "path");
var d = "";
for(var v = 0; v < polys[poly].length; v++) {
d += (v == 0 ? "M" : " L") + " " + polys[poly][v].x.toString(10) + " " + polys[poly][v].y.toString(10);
}
d += " Z";
shape.setAttributeNS(null, "d", d);
shape.setAttributeNS(null, "fill", "#7fff7f");
shape.setAttributeNS(null, "stroke", "blue");
shape.setAttributeNS(null, "stroke-width", "3");
alert(d);
svgDocument.appendChild(shape);
}
*/
// Shrink polygons
for(var poly = 0; poly < polys.length; poly++) {
var xack = 0, yack = 0;
for(var v = 0; v < polys[poly].length; v++) {
xack += polys[poly][v].x;
yack += polys[poly][v].y;
}
xack /= polys[poly].length;
yack /= polys[poly].length;
for(var v = 0; v < polys[poly].length; v++) {
polys[poly][v].x = ((polys[poly][v].x - xack) * size_factor) + xack;
polys[poly][v].y = ((polys[poly][v].y - yack) * size_factor) + yack;
}
}
// Reduce polygons
for(var poly = 0; poly < polys.length; poly++) {
var avg_dist = 0;
for(var v = 0; v < polys[poly].length; v++) {
avg_dist += Math.sqrt(
Math.pow(polys[poly][v].x - polys[poly][(v + 1) % polys[poly].length].x, 2)
+ Math.pow(polys[poly][v].y - polys[poly][(v + 1) % polys[poly].length].y, 2)
);
}
avg_dist /= polys[poly].length;
while(polys[poly].length > 3) {
var best_dist = Math.sqrt(
Math.pow(polys[poly][0].x - polys[poly][1].x, 2)
+ Math.pow(polys[poly][0].y - polys[poly][1].y, 2)
);
var best_pair = 0;
for(var v = 1; v < polys[poly].length; v++) {
var dist = Math.sqrt(
Math.pow(polys[poly][v].x - polys[poly][(v + 1) % polys[poly].length].x, 2)
+ Math.pow(polys[poly][v].y - polys[poly][(v + 1) % polys[poly].length].y, 2)
);
if(dist < best_dist) {
best_dist = dist;
best_pair = v;
}
}
if(best_dist > avg_dist * join_factor) break;
polys[poly][best_pair].x = (polys[poly][best_pair].x + polys[poly][(best_pair + 1) % polys[poly].length].x) / 2;
polys[poly][best_pair].y = (polys[poly][best_pair].y + polys[poly][(best_pair + 1) % polys[poly].length].y) / 2;
polys[poly].splice((best_pair + 1) % polys[poly].length, 1);
}
}
// Bezier render
for(var poly = 0; poly < polys.length; poly++) {
var shape = document.createElementNS("http://www.w3.org/2000/svg", "path");
var d = "";
var cc;
for(var v = 0; v < polys[poly].length + 1; v++) {
var va = v % polys[poly].length;
var vb = (va + 1) % polys[poly].length;
var lc = cc;
cc = new Vertex(
(polys[poly][va].x + polys[poly][vb].x) / 2,
(polys[poly][va].y + polys[poly][vb].y) / 2
);
if(v == 0 ) {
d += "M" + (Math.floor(cc.x * 100) / 100).toString(10)
d += " " + (Math.floor(cc.y * 100) / 100).toString(10);
} else {
var ca = new Vertex(
(polys[poly][va].x - lc.x) * edge_factor + lc.x,
(polys[poly][va].y - lc.y) * edge_factor + lc.y
);
var cb = new Vertex(
(polys[poly][va].x - cc.x) * edge_factor + cc.x,
(polys[poly][va].y - cc.y) * edge_factor + cc.y
);
d += "C" + (Math.floor(ca.x * 100) / 100).toString(10);
d += " " + (Math.floor(ca.y * 100) / 100).toString(10);
d += " " + (Math.floor(cb.x * 100) / 100).toString(10);
d += " " + (Math.floor(cb.y * 100) / 100).toString(10);
d += " " + (Math.floor(cc.x * 100) / 100).toString(10);
d += " " + (Math.floor(cc.y * 100) / 100).toString(10);
}
}
shape.setAttributeNS(null, "d", d);
shape.setAttributeNS(null, "fill", "#efefef");
shape.setAttributeNS(null, "stroke", "3f3f3f");
shape.setAttributeNS(null, "stroke-width", "1");
svgDocument.appendChild(shape);
}
} catch(e) {
// Silently fail
}
try {
// Render seeds
if(shift || seeds.length < 2) {
var best_dist = Math.sqrt(Math.pow(seeds[0].x - last_x, 2) + Math.pow(seeds[0].y - last_y, 2));
best_seed = -1;
for(var seed = 0; seed < seeds.length; seed++) {
var dist = Math.sqrt(Math.pow(seeds[seed].x - last_x, 2) + Math.pow(seeds[seed].y - last_y, 2));
if(dist <= best_dist) {
best_dist = dist;
best_seed = seed;
}
}
for(var seed = 0; seed < seeds.length; seed++) {
var shape = document.createElementNS("http://www.w3.org/2000/svg", "circle");
shape.setAttributeNS(null, "cx", seeds[seed].x);
shape.setAttributeNS(null, "cy", seeds[seed].y);
shape.setAttributeNS(null, "r", seed == best_seed ? 3 : 1.5);
shape.setAttributeNS(null, "fill", seed == best_seed ? "red" : "blue");
svgDocument.appendChild(shape);
}
}
} catch(E) {
// Silently fail
}
window.setTimeout(render, 10);
}
function is_inside() {
if(last_x >= 0 && last_x < size_w && last_y >= 0 && last_y < size_h && !shift) {
if(!inside) {
seeds[seeds.length] = {x:last_x, y:last_y};
inside = true;
}
} else {
if(inside) {
inside = false;
seeds.splice(seeds.length - 1, 1);
}
}
return inside;
}
function mouse_move(e) {
last_x = e.clientX;
last_y = e.clientY;
if(is_inside()) {
seeds[seeds.length - 1] = {x:last_x, y:last_y};
}
}
function mouse_click(e) {
if(inside || shift) {
if(shift && seeds.length && best_seed >= 0) {
seeds.splice(best_seed, 1);
} else {
seeds[seeds.length] = {x:e.clientX, y:e.clientY};
}
}
}
function key_state(e) {
shift = e.shiftKey;
is_inside();
}
function add_random() {
var count = parseIntOr(document.getElementById("randoms").value, 0);
for(var n = 0; n < count; n++) {
seeds[seeds.length] = {x:Math.random() * size_w, y:Math.random() * size_h};
}
}
function clear_all() {
seeds = new Array();
size_w = parseIntOr(document.getElementById("clear_w").value, 0);
size_h = parseIntOr(document.getElementById("clear_h").value, 0);
}
function save_svg() {
var bb = new BlobBuilder();
bb.append((new XMLSerializer).serializeToString(svgDocument));
var blob = bb.getBlob("image/svg+xml;charset=UTF-8;");
saveAs(blob, "document.svg");
}
function parseIntOr(v, def) {
v = parseInt(v);
return isNaN(v) ? def : v;
}
</script>
</head>
<body onload="init();" onkeydown="key_state(event);" onkeyup="key_state(event);" onmousemove="mouse_move(event);" onmousedown="mouse_click(event);" style="font-family:verdana;background:#e0e0e0;">
<div style="position:absolute;left:0;top:0;width:100%;background:#e0e0e0;">
<svg id="svgSurface" xmlns="http://www.w3.org/2000/svg" version="1.1">
</svg>
<div>This is the deployment of a fork from the original repo https://github.com/stg/SVoronoiG</div>
<div style="margin-top:8px;">
Click to add a seed, shift-click to remove a seed.<br>
If you need to zoom, use the browsers built-in zoom function - usually ctrl+mouse wheel.<br>
</div>
<table border="0" cellspacing="8" cellpadding="0"><tr><td valign="top">
<div style="margin-top:8px;"><button onclick="add_random();">Add</button><input id="randoms" type="text" value="10" style="width:60px;margin-left:4px;"> random seeds</div>
<div style="margin-top:8px;"><button onclick="clear_all();">Clear</button> scene to size <input id="clear_w" type="text" value="800" style="width:60px;margin-left:4px;">x<input id="clear_h" type="text" value="450" style="width:60px;"></div>
<div style="margin-top:8px;"><button onclick="save_svg();">Save</button> scene as SVG</div>
</td><td valign="top">
<div style="margin-top:8px;">Rendering parameters - normally 0-100, but negative or large values can produce interesting results</div>
<div style="margin-top:8px;">Vertex retraction: </button><input id="r_vertex" type="text" value="5" style="width:60px;margin-left:4px;">%</div>
<div style="margin-top:8px;">Bezier retraction: </button><input id="r_bezier" type="text" value="0" style="width:60px;margin-left:4px;">%</div>
<div style="margin-top:8px;">Remove vertices in close proximity - 0-200</div>
<div style="margin-top:8px;">Vertex culling: </button><input id="r_reduce" type="text" value="15" style="width:60px;margin-left:4px;">%</div>
</td></tr></table>
<div>
<p>A newer Voronoi editor with multiple Features is available <a href="https://websvg.github.io/voronoi/">Voronoi editor webapp</a> Open source on this <a href="https://github.com/WebSVG/voronoi">Github repo</a></p>
<img src="demo_overview.gif" width="300"/>
</div>
</div>
</body>
</html>