Created by Christopher Manning
Last active
December 10, 2015 10:39
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Café wall illusion
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <title>Café wall illusion</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; | |
| } | |
| rect { | |
| stroke: #7c7c7c; | |
| fill: black; | |
| stroke-width: 3px; | |
| } | |
| path { | |
| stroke: #7c7c7c; | |
| stroke-width: 3px; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <script type="text/javascript"> | |
| width = window.innerWidth | |
| height = window.innerHeight | |
| var config = { "x": 50, "width" : 50, "height": 50, "velocity": .25, "amplitude": 12, "period": 32, "lines" : true, "squares" : true }; | |
| var gui = new dat.GUI(); | |
| gui.close(); | |
| gui.add(config, "x", 0, 100) | |
| gui.add(config, "width", 1, 100) | |
| gui.add(config, "height", 3, 100) | |
| gui.add(config, "velocity", 0, 10) | |
| gui.add(config, "amplitude", 0, 100) | |
| gui.add(config, "period", 1, height/2) | |
| gui.add(config, "lines") | |
| gui.add(config, "squares") | |
| config.random = function(){ | |
| gui.__controllers.forEach(function(c){ | |
| if(c.property!="random"&&c.property!="velocity"&&c.property!="lines"&&c.property!="squares"){ | |
| c.setValue(Math.floor(Math.random() * c.__max) + c.__min) | |
| } | |
| }) | |
| } | |
| gui.add(config, "random") | |
| svg = d3.select("body").append("svg") | |
| .attr("width", width) | |
| .attr("height", height); | |
| var paths = [] | |
| var path = svg.selectAll("path") | |
| var rects = [] | |
| var rect = svg.selectAll("rect") | |
| var angle = 0 | |
| d3.timer(function(t){ | |
| paths = [] | |
| rects = [] | |
| for (var y = 0; y <= height; y++) { | |
| if (rects.length > 5000) break | |
| if (config["lines"]) paths.push([[0, y], [width, y]]) | |
| for (var x = 20 + (config["amplitude"]*Math.sin((2*Math.PI*angle)/3000+y/config["period"])); x <= width; x++) { | |
| if (config["squares"]) rects.push([x, y]) | |
| x += config["width"] + config["x"] | |
| } | |
| y += config["height"] - 1 // -1 to compensate for borders | |
| angle += config["velocity"] | |
| } | |
| rect = rect | |
| .data(rects) | |
| rect.enter() | |
| .insert("rect") | |
| rect | |
| .attr("x", function(d) { return d[0] }) | |
| .attr("y", function(d) { return d[1] }) | |
| .attr("width", function(d) { return config["width"] }) | |
| .attr("height", function(d) { return config["height"] }) | |
| rect.exit() | |
| .remove() | |
| path = path | |
| .data(paths) | |
| path.enter() | |
| .insert("path") | |
| path | |
| .attr("d", function(d) { return "M" + d.map(function(d){ return d.join(",") }).join("L") }) | |
| path.exit() | |
| .remove() | |
| }); | |
| </script> | |
| </body> | |
| </html> |
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