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Last active May 23, 2018 08:00
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Brush Handles d3v4 II
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.block
license: gpl-3.0
Raw
README.md
Raw
index.html
<!DOCTYPE html>
<meta charset="utf-8">
<style>
circle {
fill-opacity: 0.2;
transition: fill-opacity 250ms linear;
}
circle.active {
stroke: #f00;
}
</style>
<svg width="960" height="500"></svg>
<script src="https://d3js.org/d3.v4.min.js"></script>
<script>
var data = d3.range(800).map(Math.random);
var svg = d3.select("svg"),
margin = {top: 194, right: 50, bottom: 214, left: 50},
width = +svg.attr("width") - margin.left - margin.right,
height = +svg.attr("height") - margin.top - margin.bottom,
g = svg.append("g").attr("transform", "translate(" + margin.left + "," + margin.top + ")");
var x = d3.scaleLinear().range([0, width]),
y = d3.randomNormal(height / 2, height / 8);
var brush = d3.brushX()
.extent([[0, 0], [width, height]])
.on("start brush end", brushmoved);
g.append("g")
.attr("class", "axis axis--x")
.attr("transform", "translate(0," + height + ")")
.call(d3.axisBottom(x));
var circle = g.append("g")
.attr("class", "circle")
.selectAll("circle")
.data(data)
.enter().append("circle")
.attr("transform", function(d) { return "translate(" + x(d) + "," + y() + ")"; })
.attr("r", 3.5);
var gBrush = g.append("g")
.attr("class", "brush")
.call(brush);
// style brush resize handle
// https://github.com/crossfilter/crossfilter/blob/gh-pages/index.html#L466
var brushResizePath = function(d) {
var e = +(d.type == "e"),
x = e ? 1 : -1,
y = height / 2;
return "M" + (.5 * x) + "," + y + "A6,6 0 0 " + e + " " + (6.5 * x) + "," + (y + 6) + "V" + (2 * y - 6) + "A6,6 0 0 " + e + " " + (.5 * x) + "," + (2 * y) + "Z" + "M" + (2.5 * x) + "," + (y + 8) + "V" + (2 * y - 8) + "M" + (4.5 * x) + "," + (y + 8) + "V" + (2 * y - 8);
}
var handle = gBrush.selectAll(".handle--custom")
.data([{type: "w"}, {type: "e"}])
.enter().append("path")
.attr("class", "handle--custom")
.attr("stroke", "#000")
.attr("cursor", "ew-resize")
.attr("d", brushResizePath);
gBrush.call(brush.move, [0.3, 0.5].map(x));
function brushmoved() {
var s = d3.event.selection;
if (s == null) {
handle.attr("display", "none");
circle.classed("active", false);
} else {
var sx = s.map(x.invert);
circle.classed("active", function(d) { return sx[0] <= d && d <= sx[1]; });
handle.attr("display", null).attr("transform", function(d, i) { return "translate(" + [ s[i], - height / 4] + ")"; });
}
}
</script>
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