Fractal Tree

Developer
Endre Simo
Size
2,790 Kb
Views
52,624
  1. Fractal Tree Previews
  2. Fractal Tree HTML Codes
  3. Fractal Tree JS Codes

How do I make an fractal tree?

Generating h-tree. What is a fractal tree? How do you make a fractal tree? This script and codes were developed by Endre Simo on 28 November 2022, Monday.

Fractal Tree Previews
IQ Test

Fractal Tree - Script Codes HTML Codes

<!DOCTYPE html>
<html >
<head> <meta charset="UTF-8"> <title>Fractal Tree</title>
</head>
<body> <!-- Because spring is here i' have created a simple Fractal Tree - click on the canvas to generate a new tree
--> <script src="js/index.js"></script>
</body>
</html>

Fractal Tree - Script Codes JS Codes

var canvas = document.createElement('canvas');
canvas.setAttribute('id', 'canvas');
document.body.appendChild(canvas);
var canvasWidth = window.innerWidth;
var canvasHeight = window.innerHeight;
var ctx = canvas.getContext('2d');
var branches = [];
var branchLength = 150,
branchWidth = 20,
branchAngle = 45,
branchSplitFactor = 0.75;
var order = 0,
maxOrder = 100;
var	branchColors = Gradient("#800000","#008000",maxOrder);
init();
function init() { canvas.width = canvasWidth; canvas.height = canvasHeight; ctx.fillStyle = "white"; ctx.strokeStyle = "#800000" ctx.lineWidth = branchWidth; ctx.fillRect(0, 0, canvasWidth, canvasHeight); var trunk = {x : canvasWidth / 2, y : branchLength + 60, angle : 90 }; branches.push(trunk); ctx.beginPath(); ctx.moveTo(trunk.x, canvasHeight - 60); ctx.lineTo(trunk.x, canvasHeight - trunk.y); ctx.stroke(); drawBranches(branchAngle);
}
function drawBranches(angle) { if (angle == undefined) { angle = branchAngle; } branchWidth = branchWidth * branchSplitFactor; branchLength = branchLength * branchSplitFactor; var newBranches = []; ctx.beginPath(); ctx.lineWidth = branchWidth; for (var i=0; i < branches.length; i++) { var startPoint = branches[i]; var endPoint1 = getEndPoint(startPoint.x, startPoint.y, startPoint.angle + angle, branchLength); var endPoint2 = getEndPoint(startPoint.x, startPoint.y, startPoint.angle - angle, branchLength); ctx.moveTo(startPoint.x, canvasHeight - startPoint.y); ctx.lineTo(endPoint1.x, canvasHeight - endPoint1.y); ctx.moveTo(startPoint.x, canvasHeight - startPoint.y); ctx.lineTo(endPoint2.x, canvasHeight - endPoint2.y); endPoint1.angle = startPoint.angle + angle; endPoint2.angle = startPoint.angle - angle; newBranches.push(endPoint1); newBranches.push(endPoint2); } branches = newBranches; ctx.stroke(); if (branchLength > 10) { if (order > maxOrder) { order = maxOrder; } ctx.strokeStyle = branchColors[Math.floor(order)]; order++; } else { ctx.strokeStyle = '#008000'; } if (branchLength > 2) { window.setTimeout(drawBranches, 60); }
}
window.addEventListener('mousemove', function(e) { if (branchLength < 1) return false; //drawBranches(getAngle(e.pageX));
});
canvas.addEventListener('click', function(e) { ctx.clearRect(0, 0, canvasWidth, canvasHeight); branches = []; branchLength = randomRange(160, 180); branchWidth = randomRange(8, 14); branchAngle = randomRange(20, 60); branchSplitFactor = randomDecimalRange(0.70, 0.77); order = 0; maxOrder = 100; branchColors = Gradient("#800000","#008000",maxOrder); init();
});
function getEndPoint(x, y, angle, length) { return { x : x + length * Math.cos(angle * Math.PI / 180), y : y + length * Math.sin(angle * Math.PI / 180) }
}
function getAngle(x){ return parseInt(1 + 89 * x /canvasWidth);
}
function randomRange(min, max) { return ~~(Math.random() * (max - min + 1)) + min
}
function randomDecimalRange(min, max) { return Math.random() * (max - min) + min
}
function Gradient(stop1_hex, stop2_hex, num){ // stop1 and stop2 must be strings that rep hex color vals. stop1_hex = stop1_hex.replace("#","").toUpperCase(); stop2_hex = stop2_hex.replace("#","").toUpperCase(); var stops = new Array(num), stop1_rgb = {r:0,g:0,b:0}, stop2_rgb = {r:0,g:0,b:0}, steps = {r:0,g:0,b:0}, i,r,g,b; //parse the two input strings into rgb values stop1_rgb.r = parseInt(stop1_hex.substr(0,2),16); stop1_rgb.g = parseInt(stop1_hex.substr(2,2),16); stop1_rgb.b = parseInt(stop1_hex.substr(4,2),16); stop2_rgb.r = parseInt(stop2_hex.substr(0,2),16); stop2_rgb.g = parseInt(stop2_hex.substr(2,2),16); stop2_rgb.b = parseInt(stop2_hex.substr(4,2),16); steps.r = (stop2_rgb.r - stop1_rgb.r)/num; steps.g = (stop2_rgb.g - stop1_rgb.g)/num; steps.b = (stop2_rgb.b - stop1_rgb.b)/num; stops[0] = "#"+stop1_hex; for(i=1; i<num-1; i++){ r = Math.round(stop1_rgb.r+(i*steps.r)).toString(16); g = Math.round(stop1_rgb.g+(i*steps.g)).toString(16); b = Math.round(stop1_rgb.b+(i*steps.b)).toString(16); r = (r.length != 2)?"0"+r:r; g = (g.length != 2)?"0"+g:g; b = (b.length != 2)?"0"+b:b; stops[i] = "#"+(r+g+b).toUpperCase(); } stops[num-1] = "#"+stop2_hex; return stops;
}
Fractal Tree - Script Codes
Fractal Tree - Script Codes
Home Page Home
Developer Endre Simo
Username esimov
Uploaded November 28, 2022
Rating 3
Size 2,790 Kb
Views 52,624
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