This is another example of brush snapping.
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October 10, 2017 12:11
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Brush Snapping III
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license: gpl-3.0 | |
height: 600 |
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<!DOCTYPE html> | |
<meta charset="utf-8"> | |
<svg width="960" height="600"></svg> | |
<script src="https://d3js.org/d3.v4.min.js"></script> | |
<script> | |
var random = d3.randomNormal(0, 0.2), | |
sqrt3 = Math.sqrt(3), | |
points0 = d3.range(300).map(function() { return [random() + sqrt3, random() + 1, 0]; }), | |
points1 = d3.range(300).map(function() { return [random() - sqrt3, random() + 1, 1]; }), | |
points2 = d3.range(300).map(function() { return [random(), random() - 1, 2]; }), | |
points = d3.merge([points0, points1, points2]); | |
var svg = d3.select("svg"), | |
width = +svg.attr("width"), | |
height = +svg.attr("height"); | |
var k = height / width, | |
x0 = [-4.5, 4.5], | |
y0 = [-4.5 * k, 4.5 * k], | |
x = d3.scaleLinear().domain(x0).range([0, width]), | |
y = d3.scaleLinear().domain(y0).range([height, 0]), | |
z = d3.scaleOrdinal(d3.schemeCategory10); | |
var xAxis = d3.axisTop(x).ticks(12), | |
yAxis = d3.axisRight(y).ticks(12 * height / width); | |
svg.selectAll("circle") | |
.data(points) | |
.enter().append("circle") | |
.attr("cx", function(d) { return x(d[0]); }) | |
.attr("cy", function(d) { return y(d[1]); }) | |
.attr("r", 2.5) | |
.attr("fill", function(d) { return z(d[2]); }); | |
svg.append("g") | |
.attr("class", "axis axis--x") | |
.attr("transform", "translate(0," + (height - 10) + ")") | |
.call(xAxis); | |
svg.append("g") | |
.attr("class", "axis axis--y") | |
.attr("transform", "translate(10,0)") | |
.call(yAxis); | |
svg.selectAll(".domain") | |
.style("display", "none"); | |
svg.append("g") | |
.attr("class", "brush") | |
.call(d3.brushX() | |
.on("start brush", brushed)); | |
function brushed() { | |
if (d3.event.sourceEvent.type === "brush") return; | |
var d0 = d3.event.selection.map(x.invert), | |
d1 = d0.map(Math.round); | |
// If empty when rounded, use floor instead. | |
if (d1[0] >= d1[1]) { | |
d1[0] = Math.floor(d0[0]); | |
d1[1] = d1[0] + 1; | |
} | |
d3.select(this).call(d3.event.target.move, d1.map(x)); | |
} | |
</script> |
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