This animation is based on a pattern 'Sixfold Pattern 1' available in 'Islamic Geometric Design' by Eric Broug.
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August 16, 2019 04:55
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| license: gpl-3.0 |
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| <!DOCTYPE html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <style> | |
| line, circle { | |
| stroke: #000; | |
| stroke-width: 1px; | |
| } | |
| circle { | |
| fill-opacity: 0; | |
| stroke-opacity: 1; | |
| } | |
| .construction { | |
| stroke-dasharray: 2,5; | |
| } | |
| .final { | |
| stroke-width: 3px; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <div id="container"></div> | |
| <script src="https://d3js.org/d3.v5.min.js"></script> | |
| <script> | |
| const margin = {top: 50, right: 50, bottom: 50, left: 50} | |
| const height = Math.max(500, window.innerHeight - margin.top - margin.bottom); | |
| const width = Math.max(height, window.innerWidth - margin.left - margin.right); | |
| let svg = d3.select('#container').append('svg') | |
| .attr('width', width + margin.left + margin.right) | |
| .attr('height', height + margin.top + margin.bottom); | |
| let g = svg.append('g') | |
| .attr('transform', 'translate(' + (width/2 + margin.right) + ',' + (height/2 + margin.top) + ')'); | |
| const r = {outer: height/2, padding: height/10}; | |
| let circleData = []; | |
| let lineData = []; | |
| // Step 0 - draw the circle | |
| circleData.push({step: 0, category: 'construction', r: r.outer - r.padding}); | |
| // Step 1 - split the circle into 12 parts | |
| let lineNum = 12; | |
| for(let i = 0; i < lineNum; i++) { | |
| lineData.push({step: 1, category: 'construction', x1: 0, y1: 0, x2: r.outer*Math.sin(2*i*Math.PI/lineNum), | |
| y2: r.outer*Math.cos(2*i*Math.PI/lineNum)}); | |
| } | |
| // Step 2 - draw a hexagon (i.e. draw lines between the intersection of even numbered lines from step 1 and the circle) | |
| lineNum = 6; | |
| for(let i = 0; i < lineNum; i++) { | |
| lineData.push({step: 2, category: 'construction', ...addPoints(r.outer-r.padding, i, lineNum, 0)}); | |
| } | |
| // Step 3 - draw two triangles in the circle | |
| lineNum = 3; | |
| let offset = Math.PI/3; | |
| for(let i = 0; i < lineNum; i++) { | |
| lineData.push({step: 3, category: 'final', ...addPoints(r.outer-r.padding, i, lineNum, 0)}); | |
| lineData.push({step: 3, category: 'final', ...addPoints(r.outer-r.padding, i, lineNum, offset)}); | |
| } | |
| function addPoints(r, i, lineNum, offset) { | |
| return {x1: r*Math.sin(2*i*Math.PI/lineNum + offset), | |
| y1: r*Math.cos(2*i*Math.PI/lineNum + offset), | |
| x2: r*Math.sin(2*(i+1)*Math.PI/lineNum + offset), | |
| y2: r*Math.cos(2*(i+1)*Math.PI/lineNum + offset)} | |
| } | |
| // Generate the actual animations | |
| let duration = 1000; | |
| g.selectAll('circle') | |
| .data(circleData).enter() | |
| .append('circle') | |
| .attr('class', d => d.category) | |
| .transition().duration(duration).delay(d => d.step*duration) | |
| .attr('r', d => d.r); | |
| g.selectAll('line') | |
| .data(lineData).enter() | |
| .append('line') | |
| .attr('class', d => d.category) | |
| .attr('x1', d => d.x1) | |
| .attr('y1', d => d.y1) | |
| .attr('x2', d => d.x1) | |
| .attr('y2', d => d.y1) | |
| .transition().duration(duration).delay(d => d.step*duration) | |
| .attr('x2', d => d.x2) | |
| .attr('y2', d => d.y2); | |
| </script> | |
| </body> |
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