This is a simple script for generating a Dragon Curve.
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November 13, 2015 23:01
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Dragon Curve.
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <style> | |
| </style> | |
| </head> | |
| <body> | |
| <script src="http://d3js.org/d3.v3.min.js"></script> | |
| <script> | |
| var step_length = 1; | |
| var iteration = 16; | |
| var colors = ['#000000','#404040','#808080','#c0c0c0']; | |
| function dragon_turn(n) { | |
| return (((n & -n) << 1) & n) != 0; | |
| } | |
| function dragon_direction(n, v) { | |
| return dragon_turn(n) ? (v == 0 ? 3 : v-1) : (v+1) % 4; | |
| } | |
| function dragon_curve(iteration) { | |
| result = []; | |
| v = 0; | |
| result.push(v); | |
| for (var i = 1; i < (1 << iteration); i++) { | |
| v = dragon_direction(i, v); | |
| result.push(v); | |
| } | |
| return result; | |
| } | |
| function dragon_curve_path(iteration, step_length) { | |
| var result = 'M 0,0 '; | |
| var path_commands = ['v ' + step_length + ' ', 'h ' + step_length + ' ', 'v -' + step_length + ' ', 'h -' + step_length + ' ']; | |
| var directions = dragon_curve(iteration); | |
| for (var i = 0; i < directions.length; i++) { | |
| result += path_commands[directions[i]]; | |
| } | |
| return result; | |
| } | |
| var dragon_path = dragon_curve_path(iteration, step_length); | |
| var svg = d3.select('body').append('svg') | |
| .attr('width', 400) | |
| .attr('height', 800) | |
| .selectAll('g') | |
| //.data([0,1,2,3]) | |
| .data([0]) | |
| .enter() | |
| .append('g') | |
| .attr('transform', function(d) { return 'translate(200,200) rotate(' + (d*90) + ')'; }) | |
| .append('path') | |
| .attr('d', dragon_path) | |
| .attr('stroke', function(d) { return colors[d]; }) | |
| .attr('stroke-linecap', 'square') | |
| .attr('stroke-linejoin', 'miter') | |
| .attr('fill', 'none'); | |
| </script> | |
| </body> | |
| </html> |
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