Demonstrates using d3.behavior.zoom with a geographic projection. Based on an
example by Iain Dillingham.
Created
October 13, 2011 11:49
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Zoom/Pan Map Example
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| path { | |
| fill: #E5F5F9; | |
| stroke: #2CA25F; | |
| stroke-width: 0.5; | |
| } | |
| #axes { | |
| stroke: #BDBDBD; | |
| stroke-width: 0.5; | |
| } | |
| </style> | |
| <body> | |
| <script src="http://d3js.org/d3.v3.min.js"></script> | |
| <script> | |
| var width = 960, | |
| height = 500, | |
| projection = d3.geo.mercator(), | |
| path = d3.geo.path().projection(projection); | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", width) | |
| .attr("height", height) | |
| .call(d3.behavior.zoom() | |
| .translate(projection.translate()) | |
| .scale(projection.scale()) | |
| .on("zoom", redraw)); | |
| var axes = svg.append("g").attr("id", "axes"), | |
| xAxis = axes.append("line").attr("y2", height), | |
| yAxis = axes.append("line").attr("x2", width); | |
| d3.json("uk.json", function(error, json) { | |
| svg.selectAll("path") | |
| .data(json.features) | |
| .enter().append("path"); | |
| redraw(); | |
| }); | |
| function redraw() { | |
| if (d3.event) { | |
| projection | |
| .translate(d3.event.translate) | |
| .scale(d3.event.scale); | |
| } | |
| svg.selectAll("path").attr("d", path); | |
| var t = projection.translate(); | |
| xAxis.attr("x1", t[0]).attr("x2", t[0]); | |
| yAxis.attr("y1", t[1]).attr("y2", t[1]); | |
| } | |
| </script> |
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