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Sierpinski Charlet
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| <!DOCTYPE html> | |
| <html > | |
| <head> | |
| <title>Sierpinski</title> | |
| <link rel="stylesheet" href="./style.css"> | |
| </head> | |
| <body> | |
| <div class="chart"></div> | |
| </body> | |
| <script src="http://d3js.org/d3.v3.min.js" type="text/javascript"></script> | |
| <script src="https://rawgit.com/twitter/d3kit/v0.1.0/dist/d3kit.min.js" type="text/javascript"></script> | |
| <script src="main.js" type="text/javascript"></script> | |
| </html> |
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| var DEFAULT_OPTIONS = { | |
| margin: {top: 20, right: 20, bottom: 20, left: 20} | |
| }; | |
| // create sierpinski | |
| var sierpinski = new Sierpinski(6); | |
| var chart = new d3Kit.Skeleton('.chart', DEFAULT_OPTIONS) | |
| .autoResize('both') | |
| .on('resize', onResize); | |
| var options = chart.options(); | |
| // add sierpinski to | |
| chart.getRootG() | |
| .call(sierpinski.enter); | |
| // handle resize | |
| function onResize() { | |
| var width = chart.getInnerWidth (); | |
| var height = chart.getInnerHeight(); | |
| var center = [options.margin.left + width / 2, options.margin.top + height / 2]; | |
| sierpinski.property('edgeLength', d3.min([width, height])); | |
| chart.getRootG() | |
| .attr('transform', 'translate(' + center + ')') | |
| .call(sierpinski.update); | |
| } | |
| // sierpinski chartlet | |
| function Sierpinski(depth, color) { | |
| // constants | |
| var ANGLES = d3.range(0, 360, 120).map(function(d) {return degreesToRadians(d + 30);}); | |
| var TRIANGLE = 'M P0 L P1 L P2 z'; | |
| var EDGE_RADIUS_RATIO = Math.sqrt(3) / 3; | |
| color = color || [255, 128, 128]; | |
| var events = []; | |
| var children = depth > 0 ? new Sierpinski(depth - 1) : null; | |
| var charlet = d3Kit.Chartlet(enter, update, exit, events); | |
| function enter(selection, onEnd) { | |
| // if bottom out on depth, actually add path to plot triangles | |
| if (depth == 0) { | |
| selection | |
| .append('path') | |
| .classed('triangle', true) | |
| .attr('d', function() { | |
| return createTrianglePath(0); | |
| }) | |
| .style('fill', triangleColor); | |
| } | |
| // otherwise add children | |
| else { | |
| // create 3 groups one for each child sierpinski triangle | |
| var groups = selection.selectAll('g.child') | |
| .data(ANGLES) | |
| .enter() | |
| .append('g') | |
| .classed('child', true) | |
| .attr('transform', 'translate(0, 0)'); | |
| groups.call(children.enter); | |
| } | |
| onEnd(); | |
| } | |
| function update(selection, onEnd) { | |
| var radius = charlet.getPropertyValue('edgeLength') * EDGE_RADIUS_RATIO; | |
| // if children, update those | |
| if (children) { | |
| // update done when children update is done | |
| children.on('updateDone', onEnd); | |
| selection.selectAll('g.child') | |
| .transition() | |
| .attr('transform', function(d) { | |
| var x = Math.cos(d) * radius / 2; | |
| var y = Math.sin(d) * radius / 2 + radius / 8; | |
| return 'translate(' + x + ', ' + y + ')'; | |
| }); | |
| children.property('edgeLength', charlet.getPropertyValue('edgeLength') / 2); | |
| selection.selectAll('g.child') | |
| .call(children.update); | |
| } | |
| // otherwise update the triangle | |
| else { | |
| selection.selectAll('path.triangle') | |
| .transition() | |
| .attr('d', function() { | |
| return createTrianglePath(radius); | |
| }) | |
| .each('end', onEnd); | |
| } | |
| } | |
| function exit(selection, onEnd) { | |
| onEnd(); | |
| } | |
| function triangleColor(d, i) { | |
| var localColor = color.map(function(_d, _i) {return i != _i ? _d * .7 : _d;}); | |
| return d3.rgb(localColor[0], localColor[1], localColor[2]); | |
| }; | |
| // join a pattern and a set of x,y points | |
| function pathPoints(pattern, points) { | |
| return points.reduce(function(acc, point, i) { | |
| return acc.replace('P' + i, point.x + ' ' + point.y); | |
| }, pattern); | |
| } | |
| // convert degrees to radians | |
| function degreesToRadians(degrees) { | |
| return degrees / 180 * Math.PI; | |
| } | |
| // given a radius, create a triangel around the origin | |
| function createTrianglePath(radius) { | |
| var points = ANGLES.map(function(angle) { | |
| return { | |
| x: Math.cos(angle) * radius, | |
| y: Math.sin(angle) * radius + radius / 4, | |
| }; | |
| }); | |
| return pathPoints(TRIANGLE, points); | |
| } | |
| return charlet; | |
| } |
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| html { | |
| margin: 0px; | |
| padding: 0px; | |
| width: 100%; | |
| height: 100%; | |
| } | |
| body { | |
| margin: 0px; | |
| padding: 0px; | |
| width: 100%; | |
| height: 100%; | |
| } | |
| .chart { | |
| width: 100%; | |
| height: 100%; | |
| } | |
| path { | |
| stroke: #888; | |
| stroke-width: 1px; | |
| } |
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