Fractal trees created with L-systems in d3.js
Used Daniel Shiffman's p5.js video/code as a foundation
Last active
June 28, 2016 01:57
-
-
Save jhubley/02a9d65dded761ea00546fb8bf449cfc to your computer and use it in GitHub Desktop.
fractal tree in D3 - L-system
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> | |
| <body> | |
| <script src="https://d3js.org/d3.v3.min.js" charset="utf-8"></script> | |
| <script> | |
| var w = window.innerWidth, | |
| h = window.innerHeight; | |
| var theta = -12 * Math.PI / 190, | |
| length = 29, | |
| x0 = w/2, | |
| y0 = h, | |
| t0 = Math.PI / 2.5; | |
| function tree(string) { | |
| var tree = [], | |
| root = { path: "M" + x0 + "," + y0, children: [] }, | |
| step = { x: x0, y: y0, t: t0, branch: root }; | |
| var instructions = { | |
| 'F': function() { | |
| step.x -= length * Math.cos(step.t); | |
| step.y -= length * Math.sin(step.t); | |
| step.branch.path += "L" + step.x + "," + step.y; | |
| }, | |
| '+': function() { | |
| step.t += theta; | |
| }, | |
| '-': function() { | |
| step.t -= theta; | |
| }, | |
| '[': function() { | |
| tree.push(step); | |
| step = Object.create(step); | |
| var branch = { path: "M" + step.x + "," + step.y, children: [] }; | |
| step.branch.children.push(branch); | |
| step.branch = branch; | |
| }, | |
| ']': function() { | |
| step = tree.pop(); | |
| } | |
| }; | |
| string.split('').forEach(function(a) { instructions[a](); }); | |
| return root; | |
| } | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", w) | |
| .attr("height", h) | |
| .datum(tree(line(4, {"F": "F-[-F+F+F-FF]+[+FF-F-F-]"}, "F"))) | |
| .each(grow); | |
| function grow(d) { | |
| d3.select(this).append("path") | |
| .attr("stroke", "black") | |
| .attr("stroke-opacity", 0.45) | |
| .attr("stroke-width", function(d,i){i * Math.PI/38}) | |
| .attr("fill", "none") | |
| .attr("d", function(d) { return d.path; }); | |
| d3.select(this).selectAll("g") | |
| .data(d.children) | |
| .enter().append("g") | |
| .transition() | |
| .each("start", grow); | |
| } | |
| function line(n, rules, axiom) { | |
| if (n == 0){ | |
| return axiom; | |
| } else{ | |
| return line(--n, rules, axiom.replace(/./g, function(a) { return rules[a] || a; })); | |
| } | |
| } | |
| </script> | |
| </body> | |
| </html> |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment