This example shows the creation of regualar polygon from Triangle to Decagon (polygon with 10 sides)
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August 29, 2015 14:03
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Regular Polygon
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <body> | |
| <script src="http://d3js.org/d3.v3.js"></script> | |
| <script src="main.js"></script> |
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| var n = 10; | |
| var radius = 200; | |
| var width = 500; | |
| var height = 500; | |
| var j = 2; | |
| function createPointsPoly(n, radius, width, height) { | |
| var base = 2 * Math.PI / n; | |
| poly = new Array(); | |
| for(i = 0; i < n; i++) { | |
| fi_i = base * i + Math.PI / 2; | |
| x_i = radius * Math.cos(fi_i) + width /2; | |
| y_i = radius * Math.sin(fi_i) + height /2; | |
| poly.push({"x":x_i, "y":y_i}); | |
| } | |
| return poly; | |
| } | |
| var polyN = new Array(); | |
| for(i=3; i<=n; i++) polyN.push(i); | |
| d3.select('html') | |
| .append('svg') | |
| .attr("width", width) | |
| .attr("height", height) | |
| .append('polygon') | |
| .attr("points",function(d) { | |
| // Init with a triangle | |
| poly = createPointsPoly(3, radius, width, height); | |
| return poly.map(function(d) { return [d.x,d.y].join(","); }).join(" ");}) | |
| .attr("stroke","red") | |
| .attr("fill","#069") | |
| .attr("stroke-width",5); | |
| // Draw polygon | |
| d3.select('svg') | |
| .data(polyN) | |
| .on("mousedown", function() { | |
| if(j > n) j = 3; | |
| else j++; | |
| d3.selectAll("polygon").remove(); | |
| console.log(j); | |
| poly = createPointsPoly(j, radius, width, height); | |
| d3.selectAll("svg").selectAll("polygon") | |
| .data([poly]) | |
| .enter() | |
| .append('polygon') | |
| .attr("points",function(d) { | |
| return d.map(function(d) { return [d.x,d.y].join(","); }).join(" ");}) | |
| .attr("stroke","red") | |
| .attr("fill","#069") | |
| .attr("stroke-width",5); | |
| }); |
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