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September 4, 2016 04:27
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Café wall illusion
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| license: mit |
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.
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| <!DOCTYPE html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <script src="https://d3js.org/d3.v4.min.js"></script> | |
| <style> | |
| body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; font-family:Verdana, Geneva, sans-serif;} | |
| button { | |
| position: absolute; | |
| padding: 12px; | |
| top: 0; | |
| left: 0; | |
| } | |
| svg line.grid { | |
| stroke: black; | |
| stroke-width: 1px; | |
| } | |
| svg * { | |
| transition: all 600ms ease-in-out; | |
| } | |
| svg[reveal] line.grid { | |
| stroke: red; | |
| } | |
| svg[reveal] g.tile-group { | |
| opacity: 0.22 | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <button>Are these lines crooked?</button> | |
| <script> | |
| // Feel free to change or delete any of the code you see in this editor! | |
| var width = 960, | |
| height = 500, | |
| svg = d3.select("body").append("svg") | |
| .attr("width", width) | |
| .attr("height", height), | |
| tileWidth = width / 12, | |
| tileHeight = height / 12, | |
| yTicks = d3.range(-0.5, height-1, tileHeight), | |
| tileOffsets = d3.range(0,12).map(function(d) { | |
| return Math.sin(Math.PI * (d / 4)) * tileWidth; | |
| }); | |
| svg.selectAll('.grid').data(yTicks).enter() | |
| .append('line').attr('class', 'grid') | |
| .attr('x1', 0).attr('x2', width) | |
| .attr('y1', function(d) { return d; }) | |
| .attr('y2', function(d) { return d; }); | |
| svg.selectAll('.tile-group').data(yTicks).enter() | |
| .append('g') | |
| .attr('class', 'tile-group') | |
| .attr('transform', function(d, ndx) { | |
| return 'translate('+(tileOffsets[ndx] - 10)+','+d+')' }); | |
| svg.selectAll('.tile-group').selectAll('rect') | |
| .data(function(d) { return d3.range(-1,7); }) | |
| .enter().append('rect') | |
| .attr('x', function(d) { return d * tileWidth * 2; }) | |
| .attr('width', tileWidth) | |
| .attr('height', tileHeight); | |
| d3.select('button').on('click', function() { | |
| svg.attr('reveal', svg.attr('reveal') === '' ? null : ''); | |
| }); | |
| </script> | |
| </body> |
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