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October 9, 2015 20:25
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Dice roll probabilities
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| <!DOCTYPE html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js"></script> | |
| <style> | |
| body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; } | |
| svg { width: 100%; height: 100%; } | |
| text { fill: white; font-family: avenir, sans-serif; text-anchor: middle} | |
| </style> | |
| </head> | |
| <body> | |
| <script> | |
| var SIDES = 6; | |
| function rollDie(){ | |
| return Math.floor(Math.random()*SIDES) + 1; | |
| } | |
| function indexToPos(i){ | |
| return [Math.floor(i/SIDES) + 1, i % SIDES + 1]; | |
| } | |
| function posToIndex(i,j){ | |
| return (i-1)*SIDES + (j-1); | |
| } | |
| var margin = {top: 20, right: 10, bottom: 20, left: 10}; | |
| var width = 960 - margin.left - margin.right; | |
| var height = 500 - margin.top - margin.bottom; | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", width + margin.left + margin.right) | |
| .attr("height", height + margin.top + margin.bottom) | |
| .append("g") | |
| .attr("transform", "translate(" + margin.left + "," + margin.top + ")"); | |
| var s = 50; | |
| var data = d3.range(36).map(function(){return 0}) | |
| var totalData = 0; | |
| var color = d3.scale.linear() | |
| .range(["#000000", "#FF0000"]) | |
| function render(){ | |
| var cells = svg.selectAll("g.cell").data(data) | |
| newCells = cells.enter() | |
| .append("g") | |
| .attr("class", "cell") | |
| .attr("transform", function(d,i){ | |
| var pos = indexToPos(i); | |
| return "translate("+(s*pos[0])+","+(s*pos[1])+")" | |
| }) | |
| newCells.append("rect") | |
| .attr({width: s+"px", height: s+"px"}) | |
| newCells.append("text") | |
| .attr("class", "rollCount") | |
| .attr("transform", "translate("+s/2+","+s/2+")") | |
| newCells.append("text") | |
| .attr("transform", "translate("+s/2+","+0.8*s+")") | |
| .text(function(d,i){ return "(" + indexToPos(i) + ")" }) | |
| .style("font-size", "12px") | |
| cells.select("rect") | |
| .attr("fill", color) | |
| cells.select("text.rollCount") | |
| .text(function(d){return d}) | |
| } | |
| render(); | |
| d3.timer(function(){ | |
| var i = posToIndex(rollDie(), rollDie()); | |
| data[i]++; | |
| totalData++; | |
| color.domain(d3.extent(data)) | |
| render(); | |
| }) | |
| </script> | |
| </body> | |
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