Sieve of Eratosthenes
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March 24, 2016 16:10
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Sieve of Eratosthenes
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| body { | |
| font: 9px sans-serif; | |
| } | |
| </style> | |
| <body> | |
| <script src="https://d3js.org/d3.v3.js"></script> | |
| <script> | |
| var width = 960, | |
| height = 480; | |
| var n = 500, | |
| rectSize = 30, | |
| columns = Math.floor(width/rectSize); | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", width) | |
| .attr("height", height) | |
| .append("g"); | |
| var data = d3.range(2,n+1); | |
| var rect = svg.selectAll("g") | |
| .data(data).enter() | |
| .append("g") | |
| .attr("transform", function(d,i) { return "translate(" + (i%columns)*rectSize + "," + Math.floor(i/columns)*rectSize + ")"; }); | |
| rect.append("rect") | |
| .classed("unclassed",true) | |
| .attr("width",rectSize) | |
| .attr("height",rectSize) | |
| .style("fill","#66bd63") | |
| .style("stroke","white"); | |
| rect.append("text") | |
| .attr("x",rectSize/2) | |
| .attr("y",rectSize/2+3) | |
| .style("text-anchor","middle") | |
| .style("fill","white") | |
| .text(function(d) { return d; }); | |
| var list = d3.range(2,n); | |
| var transition = d3.transition() | |
| .duration(500) | |
| .delay(500) | |
| .each("start", function start() { | |
| var p = list[0]; | |
| var ind = 0; | |
| while(p * ind < n){ | |
| ind +=1; | |
| if (list.indexOf(p*ind) > -1) list.splice(list.indexOf(p*ind),1); | |
| }; | |
| rect.selectAll(".unclassed") | |
| .filter(function(d,i) { | |
| return d===p; | |
| }) | |
| .classed("unclassed",false); | |
| rect.selectAll(".unclassed") | |
| .filter(function(d,i) { | |
| return list.indexOf(d)===-1; | |
| }) | |
| .classed("unclassed",false) | |
| .transition() | |
| .duration(250) | |
| .style("fill","#f46d43") | |
| .transition() | |
| .duration(250) | |
| .style("opacity",.1); | |
| if (list.length>0) transition = transition.transition().each("start", start); | |
| }); | |
| d3.select(self.frameElement).style("height", height + "px"); | |
| </script> |
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