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Colors Interpolation
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<!DOCTYPE html> | |
<meta charset="utf-8"> | |
<style> | |
h3 { | |
margin-left: 40px; | |
margin-bottom: 2px; | |
font-family: 'Maven Pro', sans-serif; | |
font-size: 18px; | |
font-weight: bold; | |
} | |
</style> | |
<body> | |
<link href="https://fonts.googleapis.com/css?family=Maven+Pro" rel="stylesheet"> | |
<script src="//d3js.org/d3.v4.min.js"></script> | |
<script> | |
var margin = { top: 20, right: 20, bottom: 30, left: 50 }; | |
width = 800 - margin.left - margin.right, | |
height = 50 - margin.top - margin.bottom; | |
var x = d3.scaleLinear().range([0, width]); | |
var y = d3.scaleLinear().range([height, 0]); | |
var circles_data = function (count, y, radius) { | |
var data = []; | |
for (var j = 0; j < count; j++) { | |
data.push({"id": j, "x": j * 2 * radius, "y": y }); | |
} | |
return data; | |
} | |
var create_circles = function (color_func) { | |
var svg = d3.select("body").append("svg") | |
.attr("data-margin-right", margin.right) | |
.attr("data-margin-left", margin.left) | |
.attr("data-margin-top", margin.top) | |
.attr("data-margin-bottom", margin.bottom) | |
.attr("width", width + margin.left + margin.right) | |
.attr("height", height + margin.top + margin.bottom) | |
.append("g") | |
.attr("transform", "translate(" + margin.left + "," + margin.top + ")"); | |
data = circles_data(20, 140, 15); | |
x.domain(d3.extent(data, function (d) { return d.x; })).nice(); | |
y.domain(d3.extent(data, function (d) { return d.y; })).nice(); | |
svg.selectAll(".dot") | |
.data(data) | |
.enter().append("circle") | |
.attr("r", 15) | |
.attr("cx", function (d) { return x(d.x); }) | |
.attr("cy", function (d) { return y(d.y); }) | |
.style("fill", function (d) { return color_func(d.id); }); | |
} | |
var data = []; | |
// ---------------------------------------------------- | |
var color1 = d3.scaleLinear() | |
.domain([1, 20]) | |
.range(['#d73027', '#1a9850']) | |
.interpolate(d3.interpolateHcl); //interpolateHsl interpolateHcl interpolateRgb | |
d3.select("body").append("h3").html("From red to green - 2 colors interpolation") | |
create_circles(color1); | |
// ---------------------------------------------------- | |
var color2 = d3.scaleLinear() | |
.domain([1, 10, 20]) | |
.range(['#d73027', '#fee08b', '#1a9850']) | |
.interpolate(d3.interpolateHcl); //interpolateHsl interpolateHcl interpolateRgb | |
d3.select("body").append("h3").html("From red to green - 3 colors interpolation") | |
create_circles(color2); | |
// ---------------------------------------------------- | |
var step = d3.scaleLinear() | |
.domain([1, 8]) | |
.range([1, 20]); | |
var color3= d3.scaleLinear() | |
.domain([1, step(2), step(3), step(4), step(5), step(6), step(7), 20]) | |
.range(['#d73027', '#f46d43', '#fdae61', '#fee08b', '#d9ef8b', '#a6d96a', '#66bd63', '#1a9850']) | |
.interpolate(d3.interpolateHcl); //interpolateHsl interpolateHcl interpolateRgb | |
d3.select("body").append("h3").html("From red to green - 8 colors interpolation") | |
create_circles(color3); | |
// ---------------------------------------------------- | |
</script> | |
</body> | |
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