Uses geographic projection and d3.zoom working with d3.v4.js
Based on an example by Jason Davies.
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Map with pan+zoom and floating buttons for zoom in/out and reset.
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| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="utf-8"> | |
| <title>D3.v4 geographic projection and zoom</title> | |
| <link rel="stylesheet" type="text/css" href="style.css"/> | |
| </head> | |
| <body> | |
| <div id="svg"></div> | |
| <div class="controls"> | |
| <button id="zoom_in">+</button> | |
| <button id="zoom_out">-</button> | |
| <button id="reset">.</button> | |
| </div> | |
| <script type="text/javascript" src="http://d3js.org/d3.v4.min.js"></script> | |
| <script type="text/javascript" src="script.js"></script> | |
| </body> | |
| </html> |
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| var mapZoom = d3.zoom().on("zoom", freeZoom); | |
| function freeZoom() { | |
| map.attr("transform", d3.event.transform); | |
| } | |
| d3.select("#reset").on("click", function() { | |
| svg.transition().duration(500).call(mapZoom.transform, d3.zoomIdentity); | |
| }); | |
| d3.select("#zoom_in").on("click", function() { | |
| mapZoom.scaleBy(svg.transition().duration(500), 1.1); | |
| }); | |
| d3.select("#zoom_out").on("click", function() { | |
| mapZoom.scaleBy(svg.transition().duration(500), 0.9); | |
| }); | |
| var width = "400", | |
| height = "250", | |
| projection = d3.geoMercator(); | |
| projection.translate([200, 700]); | |
| projection.scale(500); | |
| var path = d3.geoPath().projection(projection); | |
| var svg = d3.select("#svg") | |
| .append("svg") | |
| .attr("width", width) | |
| .attr("height", height) | |
| .call(mapZoom); | |
| var map = svg.append("g") | |
| .attr("width", width) | |
| .attr("height", height); | |
| d3.json("uk.json", function(error, uk_json) { | |
| map.selectAll("path") | |
| .data(uk_json.features) | |
| .enter().append("path") | |
| .attr("d", path); | |
| }); | |
| var t = projection.translate() | |
| var axis = map.append("line") | |
| .attr("id", "axis") | |
| .attr("y2", height) | |
| .attr("x1", t[0]) | |
| .attr("x2", t[0]); |
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| body { | |
| margin: 10; | |
| background-color: #E0E0E0; | |
| } | |
| .controls { | |
| position: absolute; | |
| left: 15px; | |
| top: 15px; | |
| display: grid; | |
| grid-gap: 5px; | |
| } | |
| button { | |
| width: 30px; | |
| height: 30px; | |
| font-size: 18px; | |
| display:grid; | |
| border-radius:50% !important; | |
| background: rgba(240, 240, 240, 0.8); | |
| color: darkgrey; | |
| border: 1px solid #aaaaaa; | |
| user-select: none; | |
| cursor: pointer; | |
| box-sizing: border-box; | |
| } | |
| button:active { | |
| background: rgba(200, 200, 200, 0.8); | |
| } | |
| button:focus { | |
| outline: 0; | |
| } | |
| #svg { | |
| position: fixed; | |
| border: 1px solid brown; | |
| } | |
| svg { | |
| background-color: lightblue; | |
| display: block; | |
| } | |
| path { | |
| fill: green; | |
| stroke: darkgreen; | |
| stroke-width: 0.15; | |
| } | |
| #axis { | |
| stroke: brown; | |
| stroke-width: 0.25; | |
| } |
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