| license: gpl-3.0 | |
| redirect: https://observablehq.com/@d3/programmatic-zoom |
After panning or zooming with the mouse, click the "Reset" button in the top-right corner to transition back to the default viewport. This example demonstrates setting the domain of scales attached to a zoom behavior programmatically. After the domains are set, you must rebind them to the behavior.
See also a simpler version without transitions and a version with buttons that zoom around the center.
| <!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; | |
| } | |
| button { | |
| position: absolute; | |
| right: 30px; | |
| top: 30px; | |
| } | |
| </style> | |
| <button>Reset</button> | |
| <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]) | |
| .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.select("button").on("click", reset); | |
| function zoomed() { | |
| svg.select(".x.axis").call(xAxis); | |
| svg.select(".y.axis").call(yAxis); | |
| } | |
| function reset() { | |
| d3.transition().duration(750).tween("zoom", function() { | |
| var ix = d3.interpolate(x.domain(), [-width / 2, width / 2]), | |
| iy = d3.interpolate(y.domain(), [-height / 2, height / 2]); | |
| return function(t) { | |
| zoom.x(x.domain(ix(t))).y(y.domain(iy(t))); | |
| zoomed(); | |
| }; | |
| }); | |
| } | |
| </script> |
