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May 24, 2018 10:34
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license: mit |
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<!DOCTYPE html> | |
<meta charset="utf-8"> | |
<title>Zoom + Pan</title> | |
<style> | |
body { | |
position: relative; | |
width: 960px; | |
} | |
svg { | |
font: 10px sans-serif; | |
shape-rendering: crispEdges; | |
} | |
rect { | |
fill: #ddd; | |
} | |
.axis path, | |
.axis line { | |
fill: none; | |
stroke: #fff; | |
} | |
.buttons { | |
position: absolute; | |
right: 30px; | |
top: 30px; | |
} | |
</style> | |
<div class="buttons"> | |
<button data-zoom="+1">Zoom In</button> | |
<button data-zoom="-1">Zoom Out</button> | |
<button data-pan="+1">Pan +1</button> | |
<button data-pan="-1">Pan -1</button> | |
</div> | |
<script src="//d3js.org/d3.v3.min.js"></script> | |
<script> | |
var margin = {top: 20, right: 20, bottom: 30, left: 40}, | |
width = 960 - margin.left - margin.right, | |
height = 500 - margin.top - margin.bottom; | |
var x = d3.scale.linear() | |
.domain([-width / 2, width / 2]) | |
.range([0, width]); | |
var y = d3.scale.linear() | |
.domain([-height / 2, height / 2]) | |
.range([height, 0]); | |
var xAxis = d3.svg.axis() | |
.scale(x) | |
.orient("bottom") | |
.tickSize(-height); | |
var yAxis = d3.svg.axis() | |
.scale(y) | |
.orient("left") | |
.ticks(5) | |
.tickSize(-width); | |
var zoom = d3.behavior.zoom() | |
.x(x) | |
.y(y) | |
.scaleExtent([1, 10]) | |
.center([width / 2, height / 2]) | |
.size([width, height]) | |
.on("zoom", zoomed); | |
var svg = d3.select("body").append("svg") | |
.attr("width", width + margin.left + margin.right) | |
.attr("height", height + margin.top + margin.bottom) | |
.append("g") | |
.attr("transform", "translate(" + margin.left + "," + margin.top + ")") | |
.call(zoom); | |
svg.append("rect") | |
.attr("width", width) | |
.attr("height", height); | |
svg.append("g") | |
.attr("class", "x axis") | |
.attr("transform", "translate(0," + height + ")") | |
.call(xAxis); | |
svg.append("g") | |
.attr("class", "y axis") | |
.call(yAxis); | |
d3.selectAll("button[data-zoom]") | |
.on("click", clicked); | |
d3.selectAll("button[data-pan]") | |
.on("click", clickedPan); | |
function zoomed() { | |
svg.select(".x.axis").call(xAxis); | |
svg.select(".y.axis").call(yAxis); | |
} | |
function clickedPan() { | |
svg.call(zoom.event); // https://github.com/mbostock/d3/issues/2387 | |
// Record the coordinates (in data space) of the center (in screen space). | |
var center0 = zoom.center(), translate0 = zoom.translate(), coordinates0 = coordinates(center0); | |
var direction = this.getAttribute("data-pan") * -1; | |
zoom.translate([translate0[0] + center0[0]*direction , 0]); | |
svg.transition().duration(750).call(zoom.event); | |
} | |
function clicked() { | |
svg.call(zoom.event); // https://github.com/mbostock/d3/issues/2387 | |
// Record the coordinates (in data space) of the center (in screen space). | |
var center0 = zoom.center(), translate0 = zoom.translate(), coordinates0 = coordinates(center0); | |
zoom.scale(zoom.scale() * Math.pow(2, +this.getAttribute("data-zoom"))); | |
// Translate back to the center. | |
var center1 = point(coordinates0); | |
zoom.translate([translate0[0] + center0[0] - center1[0], translate0[1] + center0[1] - center1[1]]); | |
svg.transition().duration(750).call(zoom.event); | |
} | |
function coordinates(point) { | |
var scale = zoom.scale(), translate = zoom.translate(); | |
return [(point[0] - translate[0]) / scale, (point[1] - translate[1]) / scale]; | |
} | |
function point(coordinates) { | |
var scale = zoom.scale(), translate = zoom.translate(); | |
return [coordinates[0] * scale + translate[0], coordinates[1] * scale + translate[1]]; | |
} | |
</script> |
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