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sierpinski triangle
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license: gpl-3.0 | |
height: 900 |
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<html> | |
<head> | |
<title>Sierpinski Triangle</title> | |
<style type="text/css" > | |
#canvas{ | |
width:700px; | |
height:500px; | |
margin-top:20px; | |
} | |
#filterpanal{ | |
width:100%; | |
height:30px; | |
background-color: #e2e4e4; | |
} | |
#iteration{ | |
width:50px; | |
margin-left:20px; | |
margin-right: 60px; | |
} | |
</style> | |
<script type="text/javascript" src="point.js"></script> | |
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/d3/4.2.6/d3.min.js"></script> | |
<script type="text/javascript"> | |
var pA,pB,pC,xscake,yscale,data; | |
window.onload=function(){ | |
var canvas = d3.select("#canvas").node(); | |
context = canvas.getContext("2d"), | |
width = canvas.width = 700, | |
height = canvas.height = 500; | |
xscale=d3.scaleLinear().range([0,width]) | |
yscale=d3.scaleLinear().range([height,0]) | |
//context.translate(width / 2, height / 2); | |
data=[{X:324,Y:560},{X:0,Y:0},{X:648,Y:0}] | |
yscale.domain(d3.extent(data.map(function(d){return d.Y}))); | |
xscale.domain(d3.extent(data.map(function(d){return d.X}))); | |
pA=point.create((data[0].X),yscale(data[0].Y)); | |
pB=point.create(xscale(data[1].X),yscale(data[1].Y)); // | |
pC=point.create(xscale(data[2].X),yscale(data[2].Y)); // | |
iterations=+d3.select("#iteration").selectAll("option").filter(function(d){return this.selected}).node().value; | |
sierpinski(pA,pB,pC,iterations,"red"); | |
d3.select("#iteration").on("change",function(d){ | |
if(d3.select("#clearcontext").node().checked) | |
{ | |
context.clearRect(0, 0, canvas.width, canvas.height); | |
} | |
sierpinski(pA,pB,pC,+d3.select("#iteration").selectAll("option").filter(function(d){return this.selected}).node().value,"red"); | |
}) | |
function sierpinski(pa,pb,pc,limit,color) | |
{ | |
if(limit>0) | |
{ | |
var p0=point.create(((pa.X+pb.X)/2),((pa.Y+pb.Y)/2)) | |
var p1=point.create(((pc.X+pb.X)/2),((pc.Y+pb.Y)/2)) | |
var p2=point.create(((pa.X+pc.X)/2),((pa.Y+pc.Y)/2)) | |
sierpinski(pa,p0,p2,limit-1,"red"); | |
sierpinski(p0,pb,p1,limit-1,"green"); | |
sierpinski(p2,p1,pc,limit-1,"blue"); | |
} | |
else | |
{ | |
drawTriangle(pa,pb,pc,color); | |
} | |
} | |
function drawTriangle(p0, p1, p2,color) { | |
context.beginPath(); | |
context.moveTo(p0.X, p0.Y); | |
context.lineTo(p1.X, p1.Y); | |
context.lineTo(p2.X, p2.Y); | |
context.fillStyle = color; | |
context.fill(); | |
} | |
} | |
</script> | |
</head> | |
<body> | |
<div id="filterpanal"> | |
<span> Number of iterations</span> | |
<select id="iteration"> | |
<option value="1">1</option> | |
<option value="2">2</option> | |
<option value="3">3</option> | |
<option value="4">4</option> | |
<option value="5">5</option> | |
<option value="6">6</option> | |
<option value="7">7</option> | |
<option value="8" selected="true">8</option> | |
</select> | |
<span><input type="checkbox" id="clearcontext" value="clear" checked="checked">clear context at rebuild</span> | |
</div> | |
<canvas id="canvas"></canvas> | |
</body> | |
</html> |
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var point={ | |
X:0,Y:0, | |
create:function(x,y){ | |
var obj= Object.create(this); | |
obj.X=x; | |
obj.Y=y; | |
return obj; | |
} | |
} |
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