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Fractal Trees
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height: 900 |
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<html> | |
<head> | |
<title>Fractal Trees</title> | |
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/d3/4.2.6/d3.min.js"></script> | |
<script type="text/javascript"> | |
window.onload = function() { | |
var canvas = document.getElementById("canvas"), | |
context = canvas.getContext("2d"), | |
width = canvas.width = 800, | |
height = canvas.height = 800; | |
var p0 = { | |
x: width / 2, | |
y: height - 50 | |
}, | |
p1 = { | |
x: width / 2, | |
y: 50 | |
}, | |
branchAngle = randomRange(-Math.PI / 2, Math.PI / 2), | |
trunkRatio = 0.4 | |
// attaching click event to tree gen button | |
d3.select("#treegen").on("click",function(d){ | |
context.clearRect(0, 0, canvas.width, canvas.height);// Clearing the context | |
var p0 = { | |
x: width / 2, | |
y: height - 50 | |
}, | |
p1 = { | |
x: width / 2, | |
y: 50 | |
}; | |
branchAngle = randomRange(-Math.PI / 2, Math.PI / 2); | |
tree(p0, p1, 9); | |
}) | |
function randomRange(min, max) { | |
return min + Math.random() * (max - min); | |
} | |
tree(p0, p1, 9); | |
function tree(p0, p1, limit) { | |
var dx = p1.x - p0.x, | |
dy = p1.y - p0.y, | |
dist = Math.sqrt(dx * dx + dy * dy), | |
angle = Math.atan2(dy, dx), | |
branchLength = dist * (1 - trunkRatio), | |
pA = { | |
x: p0.x + dx * trunkRatio, | |
y: p0.y + dy * trunkRatio | |
}, | |
pB = { | |
x: pA.x + Math.cos(angle + branchAngle) * branchLength, | |
y: pA.y + Math.sin(angle + branchAngle) * branchLength, | |
}, | |
pC = { | |
x: pA.x + Math.cos(angle -branchAngle) * branchLength, | |
y: pA.y + Math.sin(angle - branchAngle) * branchLength, | |
}; | |
context.beginPath(); | |
context.moveTo(p0.x, p0.y); | |
context.lineTo(pA.x, pA.y); | |
context.stroke(); | |
if(limit > 0) { | |
tree(pA, pC, limit - 1); | |
tree(pA, pB, limit - 1); | |
} | |
else { | |
context.beginPath(); | |
context.moveTo(pB.x, pB.y); | |
context.lineTo(pA.x, pA.y); | |
context.lineTo(pC.x, pC.y); | |
context.stroke(); | |
} | |
} | |
}; | |
</script> | |
</head> | |
<body> | |
<input type="button" value="Random Tree" id="treegen" style="top:0px;left:20px;float:left;margin-bottom:20px;"> | |
<canvas id="canvas" ></canvas> | |
</body> | |
</html> |
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