Created
January 18, 2017 17:59
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d3 v4 brushing
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<html> | |
<body> | |
<p>Brush over the screen</p> | |
<p>Try single clicking vs clicking and dragging</p> | |
<p>Look at the console</p> | |
<script src="https://d3js.org/d3.v4.js"></script> | |
<script> | |
"use strict"; | |
var body = d3.select(document.body), | |
width = 1000, | |
height = 1000, | |
svg = body.append("svg") | |
.attr("width", width) | |
.attr("height", height), | |
isBrushing = false, | |
brushingHappened = false, | |
brush = d3.brushX() | |
.on("start", function() { | |
isBrushing = true; | |
brushingHappened = false; | |
console.log("start"); | |
}) | |
.on("brush", function() { | |
console.log("Brushing happened", d3.event.selection, [brush.extent()()[0][0], brush.extent()()[0][1]]); | |
brushingHappened = true; | |
}) | |
.on("end", function() { | |
console.log("end", d3.event.selection, [brush.extent()()[0][0], brush.extent()()[0][1]]); | |
if (!isBrushing) { | |
console.warn("ended without starting"); | |
} | |
if (!brushingHappened) { | |
console.warn("ended without any brushing"); | |
} | |
isBrushing = false; | |
brushingHappened = false; | |
}) | |
.extent([[0, 0], [width, height]]), | |
newBrushG = svg.append("g") | |
.call(brush); | |
</script> | |
</body> | |
</html> |
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