| licence: mit |
Second example of a map drawn with Svelte and the d3 projections. More than one path is created and colored using the d3-scale library.
Check this blog post from Geoexamples for more explanations.
To test it, clone the standard svelte template by
npx degit sveltejs/template svelte-app cd svelte-app
And copy the App.svelte file into the src directory.
| <script> | |
| import { geoAlbers, geoPath } from "d3-geo"; | |
| import { scaleLinear } from "d3-scale"; | |
| import { extent } from "d3-array"; | |
| import { onMount } from "svelte"; | |
| import { feature } from "topojson"; | |
| let data = []; | |
| let colorScale = () => {}; | |
| const width = "960"; | |
| const height = "500"; | |
| const projectionAlbers = geoAlbers() | |
| .rotate([4.4, 0.8]) | |
| .center([0, 55.4]) | |
| .parallels([50, 60]) | |
| .scale(3800) | |
| .translate([width / 2, (1.8 * height) / 2]); | |
| let currentProj = projectionAlbers; | |
| let path = geoPath().projection(currentProj); | |
| onMount(async function() { | |
| const response = await fetch( | |
| "https://gist.githubusercontent.com/rveciana/27272a581e975835aaa321ddf816d726/raw/c40062a328843322208b8e98c2104dc8f6ad5301/uk-counties.json" | |
| ); | |
| const json = await response.json(); | |
| const topoData = feature(json, json.objects.UK); | |
| const land = { | |
| ...topoData, | |
| features: topoData.features.filter( | |
| d => d.properties.NAME_1 === "Scotland" | |
| ) | |
| }; | |
| const namesExtent = extent(land.features, d => d.properties.NAME_2.length); | |
| colorScale = scaleLinear() | |
| .domain(namesExtent) | |
| .range(["#feedde", "#fd8d3c"]); | |
| data = land.features; | |
| }); | |
| </script> | |
| <style> | |
| svg { | |
| width: 960px; | |
| height: 500px; | |
| background-color: "#eeeeee"; | |
| } | |
| .provinceShape { | |
| stroke: #444444; | |
| stroke-width: 0.5; | |
| } | |
| </style> | |
| <svg width="960" height="500"> | |
| {#each data as feature} | |
| <path | |
| d={path(feature)} | |
| class="provinceShape" | |
| fill={colorScale(feature.properties.NAME_2.length)} /> | |
| {/each} | |
| </svg> |
| svg.svelte-8wv364 { | |
| width: 960px; | |
| height: 500px; | |
| background-color: "#eeeeee"; | |
| } | |
| .provinceShape.svelte-8wv364 { | |
| stroke: #444444; | |
| stroke-width: 0.5; | |
| } |
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