Use a linear gradient to make a legend.
Last active
February 26, 2024 20:07
-
-
Save HarryStevens/6eb89487fc99ad016723b901cbd57fde to your computer and use it in GitHub Desktop.
Gradient Legend
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| license: gpl-3.0 | |
| height: 32 | |
| border: no |
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <style> | |
| body { | |
| margin: 0; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <script src="https://d3js.org/d3.v5.min.js"></script> | |
| <script> | |
| var data = [{"color":"#000004","value":0},{"color":"#02020c","value":5},{"color":"#050417","value":10},{"color":"#0a0722","value":15},{"color":"#10092d","value":20},{"color":"#160b39","value":25},{"color":"#1e0c45","value":30},{"color":"#260c51","value":35},{"color":"#2f0a5b","value":40},{"color":"#380962","value":45},{"color":"#400a67","value":50},{"color":"#490b6a","value":55},{"color":"#510e6c","value":60},{"color":"#59106e","value":65},{"color":"#61136e","value":70},{"color":"#69166e","value":75},{"color":"#71196e","value":80},{"color":"#781c6d","value":85},{"color":"#801f6c","value":90},{"color":"#88226a","value":95},{"color":"#902568","value":100},{"color":"#982766","value":105},{"color":"#a02a63","value":110},{"color":"#a82e5f","value":115},{"color":"#b0315b","value":120},{"color":"#b73557","value":125},{"color":"#bf3952","value":130},{"color":"#c63d4d","value":135},{"color":"#cc4248","value":140},{"color":"#d34743","value":145},{"color":"#d94d3d","value":150},{"color":"#df5337","value":155},{"color":"#e45a31","value":160},{"color":"#e9612b","value":165},{"color":"#ed6925","value":170},{"color":"#f1711f","value":175},{"color":"#f47918","value":180},{"color":"#f78212","value":185},{"color":"#f98b0b","value":190},{"color":"#fa9407","value":195},{"color":"#fb9d07","value":200},{"color":"#fca60c","value":205},{"color":"#fcb014","value":210},{"color":"#fbba1f","value":215},{"color":"#fac42a","value":220},{"color":"#f8cd37","value":225},{"color":"#f6d746","value":230},{"color":"#f4e156","value":235},{"color":"#f2ea69","value":240},{"color":"#f2f27d","value":245},{"color":"#f5f992","value":250}]; | |
| var extent = d3.extent(data, d => d.value); | |
| var padding = 9; | |
| var width = 320; | |
| var innerWidth = width - (padding * 2); | |
| var barHeight = 8; | |
| var height = 28; | |
| var xScale = d3.scaleLinear() | |
| .range([0, innerWidth]) | |
| .domain(extent); | |
| var xTicks = data.filter(f => f.value % 50 === 0).map(d => d.value); | |
| var xAxis = d3.axisBottom(xScale) | |
| .tickSize(barHeight * 2) | |
| .tickValues(xTicks); | |
| var svg = d3.select("body").append("svg").attr("width", width).attr("height", height); | |
| var g = svg.append("g").attr("transform", "translate(" + padding + ", 0)"); | |
| var defs = svg.append("defs"); | |
| var linearGradient = defs.append("linearGradient").attr("id", "myGradient"); | |
| linearGradient.selectAll("stop") | |
| .data(data) | |
| .enter().append("stop") | |
| .attr("offset", d => ((d.value - extent[0]) / (extent[1] - extent[0]) * 100) + "%") | |
| .attr("stop-color", d => d.color); | |
| g.append("rect") | |
| .attr("width", innerWidth) | |
| .attr("height", barHeight) | |
| .style("fill", "url(#myGradient)"); | |
| g.append("g") | |
| .call(xAxis) | |
| .select(".domain").remove(); | |
| </script> | |
| </body> | |
| </html> |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment