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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%; } | |
| </style> | |
| </head> | |
| <body> | |
| <script> | |
| var margin = {top: 0, right: 0, bottom: 0, left: 0}; | |
| 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 nbPoints = 500; | |
| var X = 100, Y = 100; | |
| var cell = 5; | |
| var points = []; | |
| for (var i = 0; i < nbPoints; i++) { | |
| points.push([cell * Math.floor(Math.random() * X), cell * Math.floor(Math.random() * Y)]); | |
| svg.append('circle').datum(points[i]) | |
| .each(function(d) { | |
| d3.select(this).attr({cx: d[0], cy: d[1], r: 1, class: 'c' + i}) | |
| }) | |
| } | |
| var lines = {}; | |
| for (var i = 0; i < nbPoints; i++) { | |
| for (var j = 0; j < nbPoints; j++) { | |
| var pi = points[i], pj = points[j]; | |
| if (i !== j && pi[0] !== pj[0] && pi[1] !== pj[1]) { | |
| var slope = (pj[1] - pi[1]) / (pj[0] - pi[0]); | |
| var b; | |
| if (slope === -Infinity) {slope === Infinity;} | |
| if (!lines.hasOwnProperty(slope)) { | |
| lines[slope] = {}; | |
| } | |
| if (pj[0] !== pi[0]) { | |
| b = pi[1] - slope * pi[0]; | |
| } else { | |
| b = pi[0]; | |
| } | |
| if (!lines[slope].hasOwnProperty(b)) { | |
| lines[slope][b] = [i, j]; | |
| } else { | |
| if (lines[slope][b].indexOf(i) < 0) {lines[slope][b].push(i);} | |
| if (lines[slope][b].indexOf(j) < 0) {lines[slope][b].push(j);} | |
| } | |
| } | |
| } | |
| } | |
| var maxLine = 0, maxSlope, maxB; | |
| Object.keys(lines).forEach(function(slope) { | |
| Object.keys(lines[slope]).forEach(function(b) { | |
| if (lines[slope][b].length > maxLine) { | |
| maxLine = lines[slope][b].length; | |
| maxSlope = +slope; | |
| maxB = +b; | |
| } | |
| }) | |
| }) | |
| console.log(lines, maxLine, maxSlope, maxB); | |
| if (maxSlope === Infinity) { | |
| svg.append('path').attr('d', 'M' + maxB + ',0V500'); | |
| } else { | |
| svg.append('path') | |
| .attr('d', 'M0,' + maxB +'L500,' + (maxB + 500 * maxSlope)); | |
| } | |
| svg.selectAll('path').style({stroke:'red', fill: 'none', 'stroke-width': 1}) | |
| lines[maxSlope][maxB].forEach(function (i) { | |
| svg.select('.c' + i).style('fill', 'pink').attr('r', 5);}) | |
| </script> | |
| </body> | |
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