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July 22, 2016 04:12
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Basis Vectors
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| license: gpl-3.0 |
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| <!DOCTYPE html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <script src="https://d3js.org/d3.v4.min.js"></script> | |
| <style> | |
| body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; } | |
| .axis { | |
| stroke: black; | |
| stroke-width: 3px; | |
| } | |
| .grid.x { | |
| stroke: red; | |
| stroke-width: 1px; | |
| } | |
| .grid.y { | |
| stroke: blue; | |
| stroke-width: 1px; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <script> | |
| var width = 960, height = 500; | |
| // Feel free to change or delete any of the code you see in this editor! | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", width) | |
| .attr("height", height) | |
| var grid = svg.append("g") | |
| .attr("transform", "translate("+width/2+","+height/2+")") | |
| grid.append("line") | |
| .attr("class", "axis") | |
| .attr("x1", -width/2) | |
| .attr("y1", 0) | |
| .attr("x2", width/2) | |
| .attr("y2", 0) | |
| grid.append("line") | |
| .attr("class", "axis") | |
| .attr("x1", 0) | |
| .attr("y1", -height/2) | |
| .attr("x2", 0) | |
| .attr("y2", height/2) | |
| function render(r1, t1, r2, t2){ | |
| var lineCount = 60; | |
| var lineLength = Math.sqrt(width*width + height*height); | |
| var xLines = grid.selectAll(".grid.x") | |
| .data(d3.range(-lineCount, lineCount)) | |
| xLines.enter().append("line").attr("class", "grid x") | |
| .merge(xLines) | |
| .attr("x1", function(d){return d*r1}) | |
| .attr("y1", -lineLength) | |
| .attr("x2", function(d){return d*r1}) | |
| .attr("y2", lineLength) | |
| .attr("transform", "rotate(-"+t1+")") | |
| xLines.exit().remove(); | |
| var yLines = grid.selectAll(".grid.y") | |
| .data(d3.range(-lineCount, lineCount)) | |
| yLines.enter().append("line").attr("class", "grid y") | |
| .merge(yLines) | |
| .attr("x1", function(d){return d*r2}) | |
| .attr("y1", -lineLength) | |
| .attr("x2", function(d){return d*r2}) | |
| .attr("y2", lineLength) | |
| .attr("transform", "rotate(-"+t2+")") | |
| yLines.exit().remove(); | |
| } | |
| render(30, 10, 70, 120) | |
| </script> | |
| </body> |
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