上部ボタンで線形グラフと片対数グラフを切り替えます。
データはy=1/2^xです。指数関数は片対数グラフにすると直線になります。
Created
November 23, 2013 14:34
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線形軸-対数軸変換
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| <!DOCTYPE html> | |
| <html lang="ja"> | |
| <head> | |
| <meta charset="utf-8"> | |
| <title>線形-対数軸変換</title> | |
| <script src="http://d3js.org/d3.v3.min.js" charset="utf-8"></script> | |
| <style> | |
| .axis path { | |
| fill: none; | |
| stroke: black; | |
| } | |
| .axis line { | |
| stroke: black; | |
| } | |
| .line { | |
| fill: none; | |
| stroke: steelblue; | |
| stroke-width: 2 | |
| } | |
| .point { | |
| fill: white; | |
| stroke: steelblue; | |
| stroke-width: 2 | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <p><input type="button" value="軸変換！" id="toggle"></p> | |
| <svg></svg> | |
| <script> | |
| (function() { | |
| var log = false; | |
| var data = []; | |
| for(var i=0; i<10; i++) { | |
| data.push({x: i, y: Math.pow(0.5, i)}); | |
| } | |
| var w = 600, h = 400; | |
| var margin = {top: 20, left: 60, bottom: 30, right: 20}; | |
| var svg = d3.select("svg") | |
| .attr({width: w, height: h}); | |
| var xScaleLinear = d3.scale.linear() | |
| .range([margin.left, w-margin.right]) | |
| .domain([0, 9]); | |
| var yScaleLinear = d3.scale.linear() | |
| .range([h-margin.bottom, margin.top]) | |
| .domain([0, 1]); | |
| var yScaleLog = d3.scale.log() | |
| .range([h-margin.bottom, margin.top]) | |
| .domain([0.001, 1]); | |
| var xAxis = d3.svg.axis() | |
| .scale(xScaleLinear) | |
| .orient("bottom"); | |
| var yAxis = d3.svg.axis() | |
| .scale(yScaleLinear) | |
| .orient("left") | |
| .tickFormat(d3.format(".3f")); | |
| var line = d3.svg.line() | |
| .x(function(d) { return xScaleLinear(d.x); }) | |
| .y(function(d) { return yScaleLinear(d.y); }); | |
| svg.append("g") | |
| .attr("class", "x axis") | |
| .attr("transform", "translate(0,"+(h-margin.bottom)+")") | |
| .call(xAxis); | |
| svg.append("g") | |
| .attr("class", "y axis") | |
| .attr("transform", "translate("+margin.left+",0)") | |
| .call(yAxis); | |
| svg.append("path") | |
| .datum(data) | |
| .attr("class", "line") | |
| .attr("d", line); | |
| svg.selectAll(".point") | |
| .data(data) | |
| .enter() | |
| .append("circle") | |
| .attr("class", "point") | |
| .attr("cx", function(d) { return xScaleLinear(d.x); }) | |
| .attr("cy", function(d) { return yScaleLinear(d.y); }) | |
| .attr("r", 3); | |
| d3.select("#toggle") | |
| .on("click", function() { log ? logToLinear() : linearToLog(); }); | |
| function linearToLog() { | |
| line.y(function(d) { return yScaleLog(d.y); }); | |
| svg.select(".line") | |
| .transition() | |
| .duration(1000) | |
| .attr("d", line); | |
| d3.selectAll(".point") | |
| .transition() | |
| .duration(1000) | |
| .attr("cy", function(d) { return yScaleLog(d.y); }); | |
| svg.select(".y.axis") | |
| .transition() | |
| .duration(1000) | |
| .call(yAxis.scale(yScaleLog)); | |
| log = true; | |
| } | |
| function logToLinear() { | |
| line.y(function(d) { return yScaleLinear(d.y); }); | |
| svg.select(".line") | |
| .transition() | |
| .duration(1000) | |
| .attr("d", line); | |
| d3.selectAll(".point") | |
| .transition() | |
| .duration(1000) | |
| .attr("cy", function(d) { return yScaleLinear(d.y); }); | |
| svg.select(".y.axis") | |
| .transition() | |
| .duration(1000) | |
| .call(yAxis.scale(yScaleLinear)); | |
| log = false; | |
| } | |
| })(); | |
| </script> | |
| </body> | |
| </html> |
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