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zoom.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<script src="http://d3js.org/d3.v3.min.js"></script>
<style>
</style>
</head>
<body>
<button id="reset">reset</button>
<Br/>
<script>
window.addEventListener('load', function () {
var w = 800;
var h = 400;
var x, y, s;
var data = [
{ 'cx': 150, 'cy': 210, 'r': 50, 'fill': '#ff0000' },
{ 'cx': 75, 'cy': 55, 'r': 40, 'fill': '#00cc00' },
{ 'cx': 200, 'cy': 30, 'r': 30, 'fill': '#0000ff' },
{ 'cx': 650, 'cy': 190, 'r': 70, 'fill': '#0099cc' },
{ 'cx': 300, 'cy': 200, 'r': 30, 'fill': '#ff9900' }
];
var zoom = d3.behavior.zoom()
.translate([0, 0])
.scaleExtent([1, 10])
.scale(1)
.on("zoom", zoomed);
function zoomed() {
x = d3.event.translate[0];
y = d3.event.translate[1];
s = d3.event.scale;
container.attr("transform", "translate(" + d3.event.translate + ") scale(" + d3.event.scale + ")");
}
var svg = d3.select('body')
.append('svg')
.attr({
'width': w,
'height': h
}).style({
'border': '1px solid #000'
})
.call(zoom);
var container = svg.append('g');
container.append('g')
.selectAll('line')
.data(d3.range(0, w, 30))
.enter()
.append('line')
.attr({
'x1': function (d) { return d; },
'y1': 0,
'x2': function (d) { return d; },
'y2': h,
'stroke': '#ddd',
'fill': 'none'
});
container.append('g')
.selectAll('line')
.data(d3.range(0, h, 30))
.enter()
.append('line')
.attr({
'x1': 0,
'y1': function (d) { return d; },
'x2': w,
'y2': function (d) { return d; },
'stroke': '#ddd',
'fill': 'none'
});
container.append("g").selectAll('circle')
.data(data)
.enter()
.append('circle')
.attr({
'cx': function (d) { return d.cx; },
'cy': function (d) { return d.cy; },
'r': function (d) { return d.r; },
'fill': function (d) { return d.fill; }
})
.style({
'cursor': 'pointer'
});
d3.selectAll('circle').on('click', function () {
var circle = d3.select(this);
circle.transition().duration(250).tween("zoom", function () {
var r = this.getAttribute('r') * 1;
var cx = this.getAttribute('cx') * 1;
var cy = this.getAttribute('cy') * 1;
var si = d3.interpolate(s, 4);
var xi = d3.interpolate(x, (w - r) / 2 - 4 * cx);
var yi = d3.interpolate(y, (h - r) / 2 - 4 * cy);
return function (t) {
svg.call(zoom.translate([xi(t), yi(t)]).scale(si(t)).event);
}
});
});
d3.select('#reset').on('click', function () {
d3.transition().duration(250).tween("zoom", function () {
var si = d3.interpolate(s, 1);
var xi = d3.interpolate(x, 0);
var yi = d3.interpolate(y, 0);
return function (t) {
svg.call(zoom.translate([xi(t), yi(t)]).scale(si(t)).event);
}
});
});
svg.call(zoom.event);
}, false);
</script>
</body>
</html>