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forked from tonyhschu's block: Force Field
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October 18, 2016 05:01
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Force Field 2
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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; } | |
| </style> | |
| </head> | |
| <body> | |
| <script> | |
| console.clear() | |
| // Feel free to change or delete any of the code you see in this editor! | |
| var WIDTH = 960 | |
| var HEIGHT = 500 | |
| var GRID = 20 | |
| var mouse = [0, 0] | |
| function sigmoid(t) { | |
| return 1/(1+Math.pow(Math.E, -t)); | |
| } | |
| var svg = d3.select("body").append("svg") | |
| .attr("style", "background: #333") | |
| .attr("width", WIDTH) | |
| .attr("height", HEIGHT) | |
| .on("mousemove", function() { | |
| mouse = d3.mouse(this); | |
| paint() | |
| }) | |
| var vectors = d3.range(48 * 25) | |
| .map(function(key) { | |
| return { | |
| x: key % 48 * GRID, | |
| y: Math.floor(key / 48) * GRID, | |
| theta: 0, | |
| color: 0 | |
| } | |
| }) | |
| var triangles = svg.selectAll("g") | |
| .data(vectors).enter() | |
| .append('g').each(function(d) { | |
| var layer = d3.select(this) | |
| layer.append('path') | |
| .attr('fill', '#ccc') | |
| .attr('d', 'M -4, 0 L 4, 2 L 4, -2 Z') | |
| }) | |
| var paint = function() { | |
| vectors.forEach(function(d) { | |
| var dx = d.x - mouse[0] | |
| var dy = d.y - mouse[1] | |
| var dist = Math.sqrt(dx * dx + dy * dy) | |
| var dForce = (sigmoid((dist - 80) / 60) - 0.5) | |
| var nt = Math.atan2(dy, dx) + Math.PI / 2 + Math.PI * -dForce | |
| var r = Math.round(123 + dForce * 123) | |
| var g = Math.round(123 - dForce * 123) | |
| d.theta = nt | |
| d.color = 'rgb('+ r + ',' + g + ', 0)'; | |
| }) | |
| triangles | |
| .attr("transform", function(d) { | |
| return "translate(" + d.x + ", " + d.y + ") rotate(" + (d.theta / Math.PI * 180) + ")"; | |
| }) | |
| .each(function(d) { | |
| var path = d3.select(this).select('path') | |
| path.attr('fill', d.color) | |
| }) | |
| } | |
| paint() | |
| </script> | |
| </body> |
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