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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 hidden or 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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