An example displaying how to color under a curve using svg clipping paths. Drag left and right on the chart to move the area being highlighted.
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August 29, 2015 14:06
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colorUnderCurve
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <body> | |
| <script src="http://d3js.org/d3.v3.min.js"></script> | |
| <style> | |
| body { | |
| cursor: e-resize; | |
| } | |
| .axis text { | |
| font: 10px sans-serif; | |
| } | |
| .axis path, .axis line { | |
| fill: none; | |
| stroke: #000; | |
| shape-rendering: crispEdges; | |
| } | |
| .backArea { | |
| fill: #BEBDBD; | |
| stroke: none; | |
| } | |
| .backLine { | |
| fill: none; | |
| stroke: #9E9C9D; | |
| stroke-width: 2px; | |
| } | |
| .foreArea { | |
| fill: #8888FF; | |
| stroke: none; | |
| clip-path: url(#clipRect); | |
| } | |
| .foreLine { | |
| fill: none; | |
| stroke: #2020FF; | |
| stroke-width: 2px; | |
| clip-path: url(#clipRect); | |
| } | |
| #clipRect { | |
| fill: none; | |
| stroke: red; | |
| } | |
| </style> | |
| <script> | |
| var margin = {top: 10, right: 10, bottom: 30, left: 30}, | |
| width = 960 - margin.left - margin.right, | |
| height = 500 - margin.top - margin.bottom; | |
| var lineData = [ | |
| {x: 0, y: 1}, | |
| {x: 1, y: 2}, | |
| {x: 2, y: 4}, | |
| {x: 3, y: 6}, | |
| {x: 4, y: 3}, | |
| {x: 5, y: 1} | |
| ]; | |
| var x = d3.scale.linear() | |
| .domain([0, 5]) | |
| .range([0, width]), | |
| y = d3.scale.linear() | |
| .domain([0, 7]) | |
| .range([height, 0]), | |
| xAxis = d3.svg.axis() | |
| .scale(x) | |
| .orient("bottom"), | |
| yAxis = d3.svg.axis() | |
| .scale(y) | |
| .orient("left"), | |
| line = d3.svg.line() | |
| .x(function(d) { return x(d.x); }) | |
| .y(function(d) { return y(d.y); }) | |
| .interpolate("cardinal"), | |
| area = d3.svg.area() | |
| .x(function(d) { return x(d.x); }) | |
| .y0(y(0)) | |
| .y1(function(d) { return y(d.y); }) | |
| .interpolate("cardinal"), | |
| drag = d3.behavior.drag() | |
| .on("drag", dragBox); | |
| var svg = d3.select("body").call(drag) | |
| .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 + ")"); | |
| svg.append("path") | |
| .attr("class", "backArea") | |
| .attr("d", area(lineData)); | |
| svg.append("path") | |
| .attr("class", "backLine") | |
| .attr("d", line(lineData)); | |
| svg.append("path") | |
| .attr("class", "foreArea") | |
| .attr("d", area(lineData)); | |
| svg.append("path") | |
| .attr("class", "foreLine") | |
| .attr("d", line(lineData)); | |
| svg.append("clipPath") | |
| .attr("id", "clipRect") | |
| .append("rect") | |
| .attr("x", x(1.5)) | |
| .attr("width", x(1)) | |
| .attr("height", height); | |
| svg.append("g") | |
| .attr("class", "x axis") | |
| .attr("transform", "translate(0," + height + ")") | |
| .call(xAxis); | |
| svg.append("g") | |
| .attr("class", "y axis") | |
| .call(yAxis); | |
| function dragBox() { | |
| var rect = d3.select("#clipRect rect"); | |
| rect.attr("x", +rect.attr("x") + d3.event.dx); | |
| } | |
| </script> |
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