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geometric_subdivision.html
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geometric_subdivision.html
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<title>HTML 5 :: Geometric Subdivision</title>
<script src='https://ajax.googleapis.com/ajax/libs/jquery/1.5.1/jquery.min.js' type='text/javascript'></script>
<link href='http://fonts.googleapis.com/css?family=Rosarivo' rel='stylesheet' type='text/css'>
<link href='jquery-ui-1.8.20.custom/css/ui-lightness/jquery-ui-1.8.20.custom.css' rel='stylesheet' type='text/css'>
<script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jqueryui/1.8.18/jquery-ui.min.js"></script>
<style type='text/css'>
body {
background:#999;
font-family: 'Rosarivo', arial;
}
#blossom{
border:solid 4px #666;
background:white;
float:left;
}
#wrapper {
width:900px;
height:600px;
margin:50px auto;
}
#right {
width:210px;
height:567px;
float:right;
background:#ccc;
padding:20px;
}
input, label{
float:left;
width:200px;
height:20px;
}
input {
border:solid 1px #999;
padding:3px 5px;
width:190px;
}
label {
padding:10px 0 3px 0;
font-size:15px;
height:auto;
}
#submit {
position:relative;
top:15px;
background:#666;
color:white;
border:0;
font-size:15px;
padding:5px 0;
height:auto;
width:200px;
}
#submit:hover {
background:#c50;
}
#data {
clear:both;
}
.slider {
clear:both;
width:200px;
}
</style>
</head>
<body onload="construct_shape(8,1);">
<div id='wrapper'>
<canvas id="blossom" width="600" height="600"></canvas>
<div id='right'>
<form id='params'>
<label for='sides'>Number of Sides</label>
<div>
<div class='slider'></div>
<input type='hidden' id='sides' value='8' />
</div>
<label for='sides'>Point Skipping</label>
<div>
<div class='slider'></div>
<input type='hidden' id='skip' value='1' />
</div>
<label for='sides'>Line Skipping</label>
<div>
<div class='slider'></div>
<input type='hidden' id='line_skip' value='1' />
</div>
</form>
</div>
<div id='data' >
</div>
</div>
<div id="slider"></div>
<!-- End demo -->
<script type="application/javascript">
$(function () {
$( ".slider" ).slider({
animate: true,
range: "min",
value: 1,
min: 1,
max: 50,
step: 1,
//this gets a live reading of the value and prints it on the page
slide: function( event, ui ) {
$(this).parent().find('input').attr('value', ui.value);
redraw();
}
});
var size = 250;
Math.TAU = Math.PI * 2;
function clearCanvas() {
var canvas = document.getElementById("blossom"),
context = canvas.getContext("2d");
context.clearRect(0, 0, canvas.width, canvas.height);
}
//finds point for shape
function shape(sides, size) {
var output = [],
i,
slices = Math.TAU / sides,
angle;
for (i = 0; i <= sides; i += 1) {
angle = slices * i;
output[i] = {
x: Math.round(size * (1 + Math.cos(angle))),
y: Math.round(size * (1 + Math.sin(angle)))
};
}
return output;
}
function line_exists(lineFrom, lineTo, subdivided_output) {
var i,
from,
to,
sameStart,
sameEnd,
switchedStart,
switchedEnd;
for (i = 0; i < subdivided_output.length; i += 1) {
from = subdivided_output[i].from;
to = subdivided_output[i].to;
sameStart = (from.x === lineFrom.x && from.y === lineFrom.y);
sameEnd = (to.x === lineTo.x && to.y === lineTo.y);
switchedStart = (from.x === lineTo.x && from.y === lineTo.y);
switchedEnd = (to.x === lineFrom.x && to.y === lineFrom.y);
if (sameStart && sameEnd || switchedStart && switchedEnd) {
return true;
}
}
return false;
}
function subdivide(output, skip) {
var subdivided_output = [],
from,
to;
for (from = 0; from < output.length; from += 1) {
for (to = 0; to < output.length; to += skip) {
if (output[from] !== output[to] && !line_exists(output[from], output[to], subdivided_output)) {
subdivided_output[subdivided_output.length] = {from: output[from], to: output[to]};
}
}
}
return subdivided_output;
}
function draw(output, options) {
// options are: skip, xOffset, yOffset and opacity
var canvas = document.getElementById("blossom"),
ctx,
i,
line;
if (canvas.getContext) {
ctx = canvas.getContext("2d");
ctx.globalAlpha = options.opacity;
ctx.beginPath();
for (i = 0; i < output.length; i += options.skip) {
line = output[i];
ctx.lineTo(
line.from.x + options.xOffset,
line.from.y + options.yOffset
);
ctx.lineTo(
line.to.x + options.xOffset,
line.to.y + options.yOffset
);
}
ctx.stroke();
}
}
//draw shape
function construct_shape(sides, skip, line_skip) {
var output,
subdivided_output;
//constrain size
/*if (sides > 50) {
sides = 50;
}
if (sides > 19 && skip < 2) {
skip = 2;
}
if (sides > 29 && skip < 5) {
skip = 5;
}
if (sides > 40 && skip < 10) {
skip = 10;
}
*/
$('#sides').val(sides);
$('#skip').val(skip);
output = shape(sides, size); //determine point in shape
subdivided_output = subdivide(output, skip); //draw across the points
draw(subdivided_output, {
skip: line_skip,
xOffset: 50,
yOffset: 50,
opacity: 1
});
}
//trigger new parameters
function redraw(){
var sides = Number($('#sides').val()),
skip = Number($('#skip').val()),
line_skip = Number($('#line_skip').val());
clearCanvas();
construct_shape(sides, skip, line_skip);
return false;
};
redraw();
//$('#params').submit();
});
</script>
</body>
</html>