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September 6, 2017 05:48
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draw brushless motor coil
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| <html> | |
| <head> | |
| <script src="http://d3js.org/d3.v3.min.js"></script> | |
| </head> | |
| <style> | |
| svg { | |
| background-color: #eee; | |
| } | |
| path { | |
| stroke: black; | |
| fill: none; | |
| stroke-width: 5px; | |
| } | |
| </style> | |
| <body> | |
| </body> | |
| <script type="text/javascript"> | |
| let seq = n => Array.apply(null, {length: n}).map(Function.call, Number), | |
| w = 400, | |
| h = 400, | |
| svg = d3.select('body') | |
| .append('svg').attr('width', w).attr('height', h); | |
| let n = 6, | |
| angle = i => i * 2 * Math.PI / n, | |
| r = 100, | |
| s = 20, | |
| midx = w / 2, | |
| midy= h / 2, | |
| d = '', | |
| polar = (i, c, dr, di) => c + ' ' + (midx + (r + dr) * Math.cos(angle(i + di))) + ' ' + (midy + (r + dr) * Math.sin(angle(i + di))); | |
| seq(n).forEach((i) => { | |
| let f = (c, dr, di) => polar(i, c, dr, di); | |
| d += | |
| f(i == 0 ? 'M' : 'L', 0, 0) | |
| + f('Q', s, 0) | |
| + f('', s, 0.25) | |
| + f('Q', s, 0.5) | |
| + f('', 0, 0.5) | |
| + f('Q', -s, 0.5) | |
| + f('', -s, 0.75) | |
| + f('Q', -s, 1) | |
| + f('', 0, 1); | |
| }); | |
| svg.append('path').attr('d', d); | |
| </script> | |
| </html> |
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