forked from bricedev's block: Fibonacci Spiral
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May 9, 2020 15:02
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Fibonacci Spiral
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| license: mit |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <body> | |
| <script src="https://d3js.org/d3.v3.min.js"></script> | |
| <script> | |
| var width = 960, | |
| height = 600; | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", width) | |
| .attr("height", height) | |
| .append("g"); | |
| var iterationNumber = 15; | |
| var u = []; | |
| u[0]= -1; | |
| u[1]= -1.25; | |
| var d = "m" + width * .5 + "," +height * .55; | |
| for (i=0; i<iterationNumber ; i++) { | |
| r = u[i]; | |
| x = (i % 4 < 2) ? r : r * (-1); | |
| y = ((i+1) % 4 < 2) ? r : r * (-1); | |
| d += "a" + r + "," + r + " 0 0 0" + x + "," + y | |
| u[i+2] = u[i] + u[i+1]; | |
| } | |
| var path = svg.append("path") | |
| .attr("d", d) | |
| .style("stroke-width", 3) | |
| .style("stroke","#1f78b4") | |
| .style("fill","none"); | |
| // var totalLength = path.node().getTotalLength(); | |
| // path.attr("stroke-dasharray", totalLength + " " + totalLength) | |
| // .attr("stroke-dashoffset", totalLength) | |
| // .transition() | |
| // .duration(2000) | |
| // .delay(500) | |
| // .ease("exp") | |
| // .attr("stroke-dashoffset", 0); | |
| // d3.select(self.frameElement).style("height", height + "px"); | |
| </script> |
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