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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> --> | |
| <meta charset="utf-8"> | |
| <head> | |
| <title>Force layout (foci)</title> | |
| </head> | |
| <style> | |
| </style> | |
| <body> | |
| <div id="content"> | |
| <svg width="500" height="500"> | |
| <g transform="translate(0, 0)"></g> | |
| </svg> | |
| </div> | |
| <script src="https://cdnjs.cloudflare.com/ajax/libs/d3/4.2.2/d3.min.js"></script> | |
| <script> | |
| var width = 500, height = 500; | |
| var colorScale = ['orange', 'lightblue', '#B19CD9',' white']; | |
| var radius = width/2, | |
| strokeWidth = 1, | |
| hyp2 = Math.pow(radius, 2), | |
| nodeBaseRad = 4; | |
| var numNodes = 1000; | |
| var nodes = d3.range(numNodes).map(function(d, i) { | |
| return { | |
| radius: nodeBaseRad, | |
| category: i % 4 | |
| } | |
| }); | |
| var xCenter = [0, radius*2, 0, radius*2] | |
| var yCenter = [0, 0, radius*2, radius*2] | |
| var simulation = d3.forceSimulation(nodes) | |
| .force('charge', d3.forceManyBody().strength(5)) | |
| .force('x', d3.forceX().x(function(d) { | |
| return xCenter[d.category]; | |
| })) | |
| .force('y', d3.forceY().y(function(d) { | |
| return yCenter[d.category]; | |
| })) | |
| .force('collision', d3.forceCollide().radius(function(d) { | |
| return d.radius + 0.5; | |
| }).iterations(2)) | |
| .on('tick', ticked); | |
| d3.select('svg g').append('circle').attr('r', radius) | |
| .attr('cx', width/2) | |
| .attr('cy', height/2) | |
| function ticked() { | |
| var u = d3.select('svg g') | |
| .selectAll('circle.node') | |
| .data(nodes); | |
| u.enter() | |
| .append('circle') | |
| .attr('class', 'node') | |
| .attr('r', function(d) { | |
| return d.radius; | |
| }) | |
| .style('fill', function(d) { | |
| return colorScale[d.category]; | |
| }) | |
| .style('stroke', 'red') | |
| .style('stroke-width', '1px') | |
| .merge(u) | |
| .attr('cx', function(d) { | |
| return d.x = pythag(d.radius, d.y, d.x); | |
| }) | |
| .attr('cy', function(d) { | |
| return d.y = pythag(d.radius, d.x, d.y); | |
| }) | |
| u.exit().remove(); | |
| } | |
| function pythag(r, b, coord) { | |
| r += nodeBaseRad; | |
| // force use of b coord that exists in circle to avoid sqrt(x<0) | |
| b = Math.min(width - r - strokeWidth, Math.max(r + strokeWidth, b)); | |
| var b2 = Math.pow((b - radius), 2), | |
| a = Math.sqrt(hyp2 - b2); | |
| // radius - sqrt(hyp^2 - b^2) < coord < sqrt(hyp^2 - b^2) + radius | |
| coord = Math.max(radius - a + r + strokeWidth, | |
| Math.min(a + radius - r - strokeWidth, coord)); | |
| return coord; | |
| } | |
| </script> | |
| </body> | |
| </html> |
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