Created by Christopher Manning
Last active
December 10, 2015 09:49
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2D Random Walk
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <title></title> | |
| <script src="http://d3js.org/d3.v3.min.js"></script> | |
| <script type="text/javascript" src="//cdnjs.cloudflare.com/ajax/libs/dat-gui/0.5/dat.gui.min.js"></script> | |
| <style type="text/css"> | |
| body { | |
| padding: 0 | |
| margin: 0 | |
| } | |
| path { | |
| stroke: black; | |
| stroke-linejoin: round; | |
| stroke-width: 2px; | |
| fill: none; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <script type="text/javascript"> | |
| config = {"theta": 60, "steps" : 5000, "interpolation" : "basis-open", "tension" : 0}; | |
| gui = new dat.GUI(); | |
| thetaChanger = gui.add(config, "theta", 1, 360).step(1) | |
| thetaChanger.onChange(function(value) { | |
| vertices = [{xo: 0, yo: 0}] | |
| }); | |
| gui.add(config, "steps", 1, 10000).step(1); | |
| interpolationChanger = gui.add(config, "interpolation", ["linear", "step-before", "step-after", "basis", "basis-open", "basis-closed", "cardinal", "cardinal-open", "cardinal-closed", "monotone"]) | |
| interpolationChanger.onChange(function(value) { | |
| line.interpolate(value) | |
| }) | |
| tensionChanger = gui.add(config, "tension", 0, 1) | |
| tensionChanger.onChange(function(value) { | |
| line.tension(value) | |
| }) | |
| config.random = function(){ | |
| gui.__controllers.forEach(function(c){ | |
| if(typeof(c.__select) != 'undefined') { | |
| c.setValue(c.__select[Math.floor(Math.random()*(c.__select.length-1))].value) | |
| } else { | |
| if(c.property!="random"){ | |
| c.setValue(Math.floor(Math.random() * c.__max) + c.__min) | |
| } | |
| } | |
| }) | |
| redraw() | |
| } | |
| gui.add(config, "random") | |
| config.redraw = function(){ | |
| vertices = [{xo: 0, yo: 0}] | |
| } | |
| gui.add(config, "redraw") | |
| width = window.innerWidth | |
| height = window.innerHeight | |
| scale = 8 | |
| originX = width/2 | |
| originY = height/2 | |
| vertices = [{xo: 0, yo: 0}] | |
| line = d3.svg.line() | |
| .interpolate(config["interpolation"]) | |
| .tension(config["tension"]) | |
| .x(function(d, i) { return originX + (d.xo*scale) }) | |
| .y(function(d, i) { return originY + (d.yo*scale) }) | |
| zoom = d3.behavior.zoom() | |
| .scale(scale) | |
| .scaleExtent([1, 32]) | |
| .on("zoom", redraw) | |
| svg = d3.select("body").append("svg") | |
| .attr("width", width) | |
| .attr("height", height) | |
| .call(zoom); | |
| function redraw() { | |
| originX = (width/2) + d3.event.translate[0] | |
| originY = (height/2) + d3.event.translate[1] | |
| scale = d3.event.scale | |
| } | |
| svg | |
| .append("path") | |
| edge = svg.selectAll("path") | |
| .data(vertices) | |
| d3.timer(function(t){ | |
| if(vertices.length < config["steps"]) { | |
| for(var i=0;i<1000;i++){ | |
| var last = vertices[vertices.length-1] | |
| var xo = last.xo | |
| var yo = last.yo | |
| var r=Math.floor(Math.random()*(360/config["theta"])) | |
| var theta = Math.PI * ((r * config["theta"] % 360)/180) | |
| xo+=Math.cos(theta) | |
| yo+=Math.sin(theta) | |
| vertices.push({xo: xo, yo: yo}) | |
| } | |
| } else if(vertices.length > config["steps"]) { | |
| vertices.length = config["steps"] | |
| } | |
| edge.attr("d", function(d) { return line(vertices) }) | |
| }); | |
| </script> | |
| </body> | |
| </html> |
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