Modifying a radius with collision detection.
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May 17, 2017 14:15
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Collision Radius Transition
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| license: gpl-3.0 |
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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> | |
| var width = 400; | |
| var height = 400; | |
| var svg = d3.select("body") | |
| .append("svg") | |
| .attr("width", width) | |
| .attr("height", height) | |
| var data = d3.range(100).map(function() { | |
| return { radius: Math.random() * 20 } | |
| }); | |
| var forceCollide = d3.forceCollide(function(d) { return d.radius; }) | |
| .strength(0.8); | |
| var s = 0.02; | |
| var forceX = d3.forceX(width/2).strength(s); | |
| var forceY = d3.forceY(height/2).strength(s); | |
| var force = d3.forceSimulation(data) | |
| .force('x', forceX) | |
| .force('y', forceY) | |
| .force('center', d3.forceCenter(width/2, height/2)) | |
| .force('collide', forceCollide) | |
| .on('tick', function() { | |
| svg.selectAll('.node') | |
| .attr('cx', function(d) { return d.x; }) | |
| .attr('cy', function(d) { return d.y; }) | |
| }) | |
| svg.selectAll('.node') | |
| .data(data) | |
| .enter() | |
| .append('circle') | |
| .classed('node', true) | |
| .style('opacity', 0.5) | |
| .attr('r', function(d) { return d.radius; }); | |
| force.nodes(data) | |
| .alpha(1) | |
| .restart() | |
| d3.select(svg.node().parentNode).append('button').text('grow') | |
| .on('click', switchRadius(100)) | |
| d3.select(svg.node().parentNode).append('button').text('shrink') | |
| .on('click', switchRadius(10)) | |
| function switchRadius(newRadius) { | |
| return function() { | |
| d3.selectAll('.node') | |
| .filter(function(d,i) { return i === 5; }) | |
| .transition().duration(1000) | |
| .tween('radius', function(d) { | |
| var that = d3.select(this); | |
| var i = d3.interpolate(d.radius, newRadius); | |
| return function(t) { | |
| d.radius = i(t); | |
| that.attr('r', function(d) { return d.radius; }); | |
| force.nodes(data) | |
| } | |
| }); | |
| force.alpha(1).restart(); | |
| } | |
| } | |
| </script> | |
| </body> |
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