A tree fractal using circles and HTML5 Canvas.
Original example from github.com/curran/HTML5Examples
Built with blockbuilder.org
Last active
December 8, 2015 19:45
-
-
Save curran/753a89ecc73b07cdcf66 to your computer and use it in GitHub Desktop.
Tree Fractal with Circles
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <!-- | |
| An interactive fractal experiment using HTML5 Canvas | |
| Curran Kelleher 10/28/2014 | |
| --> | |
| <title>fractal</title> | |
| </head> | |
| <body> | |
| <canvas id="fractal" width="960" height="500"></canvas> | |
| <script> | |
| var canvas = document.getElementById("fractal"), | |
| ctx = canvas.getContext("2d"), | |
| nMax = 95, | |
| mouseX = 800, mouseY = 83 | |
| scaleFactor = (100 - 4.4688) / 100; | |
| function redraw (){ | |
| var scale = 20, | |
| angle = -mouseY / canvas.height * Math.PI / 8; | |
| ctx.clearRect(0, 0, canvas.width, canvas.height); | |
| var n = Math.floor(nMax * mouseX / 960); | |
| ctx.save(); | |
| ctx.translate(497, 472); | |
| drawGeometry(scale, angle, 0, n, false); | |
| ctx.restore(); | |
| } | |
| // The recursive fractal definition | |
| function drawGeometry(scale, angle, i, n, flip){ | |
| drawCircle(0, 0, scale / 2) | |
| ctx.translate(0, -scale); | |
| ctx.rotate(flip ? angle : -angle); | |
| if(i < n){ | |
| ctx.save(); | |
| // Continue the current branch. | |
| drawGeometry(scale * scaleFactor, angle, i+1, n, flip); | |
| // Create a new branch every 10 circles. | |
| if(i % 11 === 0){ | |
| drawGeometry(scale * scaleFactor, angle, i+1, n, !flip); | |
| } | |
| ctx.restore(); | |
| } | |
| } | |
| function drawCircle(x, y, radius){ | |
| ctx.beginPath(); | |
| ctx.arc(x, y, radius, 0, 2 * Math.PI, false); | |
| ctx.fill(); | |
| } | |
| redraw(); | |
| canvas.addEventListener("mousemove",function(e){ | |
| mouseX = e.x; | |
| mouseY = e.y; | |
| redraw(); | |
| }); | |
| </script> | |
| </body> | |
| </html> |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment