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html
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<
head
>
<
meta
charset
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"utf-8"
>
<
script
src
=
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>
<
style
>
circle {
fill-opacity: 0.2;
}
circle.active {
fill-opacity: 0.8;
stroke: red;
fill: green;
}
</
style
>
</
head
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<
body
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<
center
>
<
h1
style
=
"color:green;"
>GeeksForGeeks</
h1
>
<
h3
>D3.js | brush.move() Function </
h3
>
<
svg
width
=
"600"
height
=
"300"
></
svg
>
<
script
>
var data = d3.range(100).map(Math.random);
var svg = d3.select("svg"),
margin = {top: 50, right: 50,
bottom: 50, 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, 0)")
.call(d3.axisTop(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", 10);
var gBrush = g.append("g")
.attr("class", "brush")
.call(brush);
gBrush.call(brush.move, [0.3, 0.5].map(x));
var bs = "";
function brushmoved() {
var s = d3.event.selection;
if (d3.event.type === "start"){
bs = d3.event.selection;
} else if (d3.event.type === "end"){
if (bs[0] !== s[0] && bs[1] !== s[1]) {
console.log('moved both');
} else if (bs[0] !== s[0]) {
console.log('moved left');
} else {
console.log('moved right');
}
}
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 / 2 + ")";
});
}
}
</
script
>
</
center
>
</
body
>
</
html
>