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July 16, 2022 11:06
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Linear Gradient Along Line Path
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <script src="//d3js.org/d3.v4.min.js"></script> | |
| <body> | |
| <script> | |
| var margin = 0, | |
| width = 600 - margin, | |
| height = 200 - margin; | |
| var colorRange = ['#d7191c', '#fdae61', '#ffffbf', '#a6d96a', '#1a9641'] //['#ffffcc', '#a1dab4', '#41b6c4', '#2c7fb8', '#253494'] | |
| var color = d3.scaleLinear().range(colorRange).domain([1, 2, 3, 4, 5]); | |
| var data = [ { "x": 10, "y": 20}, { "x": 20, "y": 60}, | |
| { "x": 30, "y": 50}, { "x": 40, "y": 130}, | |
| { "x": 50, "y": 30 }, { "x": 60, "y": 170 }, | |
| { "x": 70, "y": 24 }, { "x": 80, "y": 130 }, | |
| { "x": 90, "y": 70 }, { "x": 100, "y": 180 }]; | |
| var x = d3.scaleLinear().range([0, width]); | |
| var y = d3.scaleLinear().range([height, 0]); | |
| x.domain(d3.extent(data, function (d) { return d.x; })).nice; | |
| y.domain(d3.extent(data, function (d) { return d.y; })).nice; | |
| var line = d3.line() | |
| .x(function (d) { return x(d.x); }) | |
| .y(function (d) { return y(d.y); }) | |
| .curve(d3.curveCardinal); | |
| var svg = d3.select('body') | |
| .append('svg') | |
| .attr("width", width + (margin * 2)) | |
| .attr("height", height + (margin * 2)) | |
| .append("g") | |
| .attr("transform", "translate(" + (margin) + "," + (margin) + ")"); | |
| var linearGradient = svg.append("defs") | |
| .append("linearGradient") | |
| .attr("id", "linear-gradient") | |
| .attr("gradientTransform", "rotate(90)"); | |
| linearGradient.append("stop") | |
| .attr("offset", "0%") | |
| .attr("stop-color", color(1)); | |
| linearGradient.append("stop") | |
| .attr("offset", "25%") | |
| .attr("stop-color", color(2)); | |
| linearGradient.append("stop") | |
| .attr("offset", "50%") | |
| .attr("stop-color", color(3)); | |
| linearGradient.append("stop") | |
| .attr("offset", "75%") | |
| .attr("stop-color", color(4)); | |
| linearGradient.append("stop") | |
| .attr("offset", "100%") | |
| .attr("stop-color", color(5)); | |
| svg.append("path") | |
| .attr("d", line(data)) | |
| .attr("stroke-width", 6) | |
| .attr("stroke", "url(#linear-gradient)") | |
| .attr("fill", "none"); | |
| </script> | |
| </body> |
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