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#map { | ||
background: black; | ||
} | ||
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.svg-layer path:hover { | ||
opacity: 0.4; | ||
} |
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--- | ||
layout: example.html | ||
title: SVG Layer | ||
shortdesc: Example of a map with an interactive svg layer. | ||
docs: > | ||
With a plain `ol/Layer` and a `render` function, we can use an interactive svg as layer. Hover over countries to see the interactivity that is defined purely with a css `:hover` pseudo-class. | ||
tags: "svg, layer, render, transform" | ||
--- | ||
<div id="map" class="map"></div> |
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import Map from '../src/ol/Map.js'; | ||
import View from '../src/ol/View.js'; | ||
import Layer from '../src/ol/layer/Layer.js'; | ||
import {composeCssTransform} from '../src/ol/transform.js'; | ||
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const map = new Map({ | ||
target: 'map', | ||
view: new View({ | ||
center: [0, 0], | ||
extent: [-180, -90, 180, 90], | ||
projection: 'EPSG:4326', | ||
zoom: 2 | ||
}) | ||
}); | ||
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const svgContainer = document.createElement('div'); | ||
const xhr = new XMLHttpRequest(); | ||
xhr.open('GET', 'data/world.svg'); | ||
xhr.addEventListener('load', function() { | ||
const svg = xhr.responseXML.documentElement; | ||
svgContainer.ownerDocument.importNode(svg); | ||
svgContainer.appendChild(svg); | ||
}); | ||
xhr.send(); | ||
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const width = 2560; | ||
const height = 1280; | ||
const svgResolution = 360 / width; | ||
svgContainer.style.width = width + 'px'; | ||
svgContainer.style.height = height + 'px'; | ||
svgContainer.style.transformOrigin = 'top left'; | ||
svgContainer.className = 'svg-layer'; | ||
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map.addLayer(new Layer({ | ||
render: function(frameState) { | ||
const scale = svgResolution / frameState.viewState.resolution; | ||
const center = frameState.viewState.center; | ||
const size = frameState.size; | ||
const cssTransform = composeCssTransform( | ||
size[0] / 2, size[1] / 2, | ||
scale, scale, | ||
frameState.viewState.rotation, | ||
-center[0] / svgResolution - width / 2, center[1] / svgResolution - height / 2); | ||
svgContainer.style.transform = cssTransform; | ||
svgContainer.style.opacity = this.getOpacity(); | ||
return svgContainer; | ||
} | ||
})); |
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