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@EfratVil EfratVil/README.md

Last active Sep 18, 2016
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Scatter plot brushing

Scatter plot brushing.

<!DOCTYPE html>
<meta charset="utf-8">
<body>
<script src="//d3js.org/d3.v4.min.js"></script>
<p id="g1"></p>
<script>
function randomData(samples) {
var data = [],
random = d3.randomNormal();
for (i = 0; i < samples; i++) {
data.push({
x: random(),
y: random()
});
}
return data;
}
var ds = randomData(300);
var margin = { top: 20, right: 20, bottom: 30, left: 50 };
width = 800 - margin.left - margin.right,
height = 400 - margin.top - margin.bottom;
var x = d3.scaleLinear()
.range([0, width]);
var y = d3.scaleLinear()
.range([height, 0]);
var xAxis = d3.axisBottom(x).ticks(12),
yAxis = d3.axisLeft(y).ticks(12 * height / width);
var svg = d3.select("#g1").append("svg")
.attr("id", "g1_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 + ")");
x.domain(d3.extent(ds, function (d) { return d.x; })).nice();
y.domain(d3.extent(ds, function (d) { return d.y; })).nice();
svg.append("g")
.attr("class", "x axis ")
.attr('id', "axis--x")
.attr("transform", "translate(0," + height + ")")
.call(xAxis);
svg.append("g")
.attr("class", "y axis")
.attr('id', "axis--y")
.call(yAxis);
var dot = svg.selectAll(".dot")
.data(ds)
.enter().append("circle")
.attr("class", "dot")
.attr("r", 5)
.attr("cx", function (d) { return x(d.x); })
.attr("cy", function (d) { return y(d.y); })
.attr("opacity", 0.7)
.style("fill", "#4292c6");
svg.append("g")
.call(d3.brush().extent([[0, 0], [width, height]]).on("brush", brushed).on("end", brushended));
function brushed() {
var s = d3.event.selection,
x0 = s[0][0],
y0 = s[0][1],
dx = s[1][0] - x0,
dy = s[1][1] - y0;
// console.log(s);
svg.selectAll('circle')
.style("fill", function (d) {
if (x(d.x) >= x0 && x(d.x) <= x0 + dx && y(d.y) >= y0 && y(d.y) <= y0 + dy)
{ return "#ec7014"; }
else { return "#4292c6"; }
});
}
function brushended() {
if (!d3.event.selection) {
svg.selectAll('circle')
.transition()
.duration(150)
.ease(d3.easeLinear)
.style("fill", "#4292c6");
}
}
</script>
</body>
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