This example tries to use d3fc-label-layout to achieve overlap-free visualization of country labels. Ideas are taken from ColinEberhardt' example showing how to use d3fc-label-layout on maps.
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July 14, 2017 16:05
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D3.js map with _d3fc-label-layout_ based label positioning
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| <!DOCTYPE html> | |
| <html> | |
| <meta charset="utf-8" \> | |
| <style> | |
| path { | |
| stroke: white; | |
| stroke-width: 1.5px; | |
| fill: #C4C4C4; | |
| } | |
| </style> | |
| <body> | |
| <script src="https://d3js.org/d3.v4.min.js"></script> | |
| <script src="https://npmcdn.com/d3fc-label-layout@4.0.0/build/d3fc-label-layout.js"></script> | |
| <script src="https://npmcdn.com/d3fc-data-join@2.0.0/build/d3fc-data-join.js"></script> | |
| <script src="https://npmcdn.com/d3fc-rebind@4.0.1/build/d3fc-rebind.js"></script> | |
| <script src="map.js"></script> | |
| </body> | |
| </html> |
MIT License
Copyright (c) 2017 Guido Pleßmann
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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| var width = 1300, | |
| height = 960; | |
| var projection = d3.geoMercator() | |
| .scale(500) | |
| // Center the Map to middle of shown area | |
| .center([10.0, 50.5]) | |
| .translate([width / 2, height / 2]); | |
| // ?? | |
| var path = d3.geoPath() | |
| .projection(projection) | |
| .pointRadius(2); | |
| // Set svg width & height | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", width) | |
| .attr("height", height); | |
| // var g = svg.append("g"); | |
| d3.json("europe_wgs84.geojson", function(error, map_data) { | |
| if (error) return console.error(error); | |
| // var places = topojson.feature(map_data, map_data.objects.places); | |
| // "path" instead of ".subunit" | |
| svg.selectAll("path") | |
| .data(map_data.features) | |
| .enter().append("path") | |
| .attr("d", path) | |
| .attr("class", function(d) { return "label " + d.id}) | |
| var labelPadding = 2; | |
| // the component used to render each label | |
| var textLabel = fc.layoutTextLabel() | |
| .padding(labelPadding) | |
| //.value(function(d) { return map_data.properties.iso; }); | |
| .value(function(d) { return d.properties.iso; }); | |
| // use simulate annealing to find minimum overlapping text label positions | |
| var strategy = fc.layoutGreedy(); | |
| // create the layout that positions the labels | |
| var labels = fc.layoutLabel(strategy) | |
| .size(function(_, i, g) { | |
| // measure the label and add the required padding | |
| var textSize = d3.select(g[i]) | |
| .select('text') | |
| .node() | |
| .getBBox(); | |
| return [textSize.width + labelPadding * 2, textSize.height + labelPadding * 2]; | |
| }) | |
| .position(function(d) { return projection(d.geometry.coordinates); }) | |
| .component(textLabel); | |
| // render! | |
| svg.datum(map_data.features) | |
| .call(labels); | |
| }); | |
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