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| license: mit |
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| <!DOCTYPE html> | |
| <h1><code>d3.js</code>, Force Layout primer</h1> | |
| <h2>For study purposes only</h2> | |
| <ul> | |
| <li>Cleaned up an example from : | |
| https://bl.ocks.org/mbostock/1095795/8f34afdd6d321b71ca6b3a5904e486f3173f1111</li> | |
| <li>Cleaned up example uses d3 version 5.</li> | |
| <li>Original example license : https://opensource.org/licenses/GPL-3.0</li> | |
| <li>Original example uses d3 version 4.</li> | |
| </ul> | |
| <p> | |
| fork and updated from from https://bl.ocks.org/jerng/b47cf70fc0fd20ccf56cdb42e172e877 | |
| </p> | |
| <script src="https://d3js.org/d3.v5.min.js"></script> | |
| <script> | |
| 'use strict' | |
| let width = 500, | |
| height = 500, | |
| color = d3.scaleOrdinal(d3.schemeCategory10), | |
| svg = d3.select ( 'body' ) | |
| .insert ( 'svg' ) | |
| .attr ( 'width', width ) | |
| .attr ( 'height', height ) | |
| .attr ( 'style', 'background-color:#eeeeee' ) | |
| let a = { id: 'a' }, | |
| b = { id: 'b' }, | |
| c = { id: 'c' }, | |
| dataArray = [ a, b, c ] | |
| let g = svg.append ( 'g' ) | |
| .attr ( 'transform', | |
| 'translate( ' + width / 2 + ',' + height / 2 + ' )' ), | |
| gg = g.append ( 'g' ) | |
| .attr ( 'stroke', '#fff' ) | |
| .attr ( 'stroke-width', 1.5) | |
| .selectAll () // empty selection | |
| let restart = function restart () { | |
| gg = gg | |
| .data ( dataArray, d => d.id ) | |
| .join ( | |
| enterer => enterer | |
| .append ( 'circle' ) | |
| .attr("fill", d => color(d.id) ) | |
| .attr("r", 8) | |
| ) | |
| // add these two lines here | |
| simulation.nodes( dataArray); | |
| simulation.alpha(1).restart(); | |
| }, | |
| tickHandler = function () { | |
| gg .attr( 'cx', d => d.x ) | |
| .attr( 'cy', d => d.y ) | |
| } | |
| let simulation = d3.forceSimulation ( dataArray ) | |
| .force ( 'charge', d3.forceManyBody ().strength ( -1000 ) ) | |
| .force ( 'x', d3.forceX () ) | |
| .force ( 'y', d3.forceY () ) | |
| .alphaTarget ( 1 ) | |
| .on ( 'tick', tickHandler ) | |
| restart() | |
| setTimeout ( () => { | |
| dataArray.pop() | |
| restart() | |
| }, 1000 ) | |
| setTimeout ( () => { | |
| dataArray.push(c) | |
| restart() | |
| }, 2000 ) | |
| setTimeout ( () => { | |
| console.error ( `pushing in another value breaks FIXME`, dataArray ) | |
| dataArray.push( { id: 'd' } ) | |
| restart() | |
| }, 3000 ) | |
| </script> |
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