<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script src=
</script>
<style>
circle {
opacity: 0.7;
}
</style>
</head>
<body>
<center>
<h1 style="color: green;">
Geeksforgeeks
</h1>
<h3>D3.js | zoom.invertY() Function</h3>
<svg></svg>
<script>
var radius = 15;
var svg = d3.select('svg');
var dimension = document.body
.getBoundingClientRect();
var data = d3.range(0, 50).map(function () {
return {
x: getRandom(radius, 400 - radius),
y: getRandom(radius, 200 - radius)
}
});
var zoom = d3.zoom()
.constrain(mydata)
.on('zoom', function () {
canvas.attr('transform',
d3.event.transform);
})
var canvas = svg.attr('width', 400)
.attr('height', 200)
.call(zoom)
.insert('g', ':first-child');
canvas.selectAll('circle')
.data(data)
.enter()
.append('circle')
.attr('r', radius)
.attr('cx', function (d) {
return d.x;
})
.attr('cy', function (d) {
return d.y;
})
.style('fill', function () {
return d3.schemeCategory10
[getRandom(0, 9)]
});
function getRandom(min, max) {
min = Math.ceil(min);
max = Math.floor(max);
return Math.floor(Math.random()
* (max - min + 1)) + min;
}
function mydata(transform, extent,
translateExtent) {
var dx0 = transform.invertX(
extent[0][0]) - translateExtent[0][0],
dx1 = transform.invertX(
extent[1][0]) - translateExtent[1][0],
dy0 = transform.invertY(
extent[0][1]) - translateExtent[0][1],
dy1 = transform.invertY(
extent[1][1]) - translateExtent[1][1];
return transform.translate(
dx1 > dx0 ? (dx0 + dx1) / 2 :
Math.min(0, dx0) || Math.max(0, dx1),
dy1 > dy0 ? (dy0 + dy1) / 2 :
Math.min(0, dy0) || Math.max(0, dy1)
);
}
</script>
</center>
</body>
</html>