How to draw a distribution of points along an Archimedean Spiral using D3.js.
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June 29, 2020 14:42
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Points Along an Archimedean Spiral
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| svg { | |
| background: white; | |
| } | |
| .spiral { | |
| fill: none; | |
| stroke: #303030; | |
| stroke-width: 3px; | |
| } |
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta name="description" content="Points Along an Archimedean Spiral" /> | |
| <meta http-equiv="Content-Type" content="text/html;charset=utf-8"> | |
| <script type="text/javascript" src="http://d3js.org/d3.v2.js"></script> | |
| </head> | |
| <body> | |
| <div id="chart"></div> | |
| <script type="text/javascript" src="index.js"></script> | |
| </body> | |
| </html> |
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| var width = 960, | |
| height = 500; | |
| var centerX = width/2, | |
| centerY = height/2, | |
| radius = 200, | |
| sides = 200, | |
| coils = 8, | |
| rotation = 0; | |
| // How far to step away from center for each side. | |
| var awayStep = radius/sides; | |
| // How far to rotate around center for each side. | |
| var aroundStep = coils/sides;// 0 to 1 based. | |
| // Convert aroundStep to radians. | |
| var aroundRadians = aroundStep * 2 * Math.PI; | |
| // Convert rotation to radians. | |
| rotation *= 2 * Math.PI; | |
| var new_time = []; | |
| // For every side, step around and away from center. | |
| for(var i=1; i<=sides; i++){ | |
| // How far away from center | |
| var away = i * awayStep; | |
| // How far around the center. | |
| var around = i * aroundRadians + rotation; | |
| // Convert 'around' and 'away' to X and Y. | |
| var x = centerX + Math.cos(around) * away; | |
| var y = centerY + Math.sin(around) * away; | |
| new_time.push({x: x, y: y}); | |
| } | |
| console.log(new_time); | |
| var svg = d3.select("#chart").append("svg") | |
| .attr("width", width) | |
| .attr("height", height) | |
| .append("g"); | |
| var lineFunction = d3.svg.line() | |
| .x(function(d) { return d.x; }) | |
| .y(function(d) { return d.y; }) | |
| .interpolate("cardinal"); | |
| svg.append("path") | |
| .attr("d", lineFunction(new_time)) | |
| .attr("stroke", "gray") | |
| .attr("stroke-width", 0.5) | |
| .attr("fill", "none"); | |
| var circles = svg.selectAll("circle") | |
| .data(new_time) | |
| .enter() | |
| .append("circle") | |
| .attr("cx", function (d) { return d.x; }) | |
| .attr("cy", function (d) { return d.y; }) | |
| .attr("r", 2); |
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Hi lonnietc, if you mean to add an SVG text containing an integer near every point on the spiral, you should change lines 56 to 62 to something like:
Of course, you should properly handle the visibility of your texts since in this way the visualization will result quite cluttered.