2019-11-04 10:59:08 +01:00
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<title>GeoJson</title>
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</head>
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<body onload='Doctest.run()'>
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2023-05-09 13:25:39 +02:00
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<h1><a href="../../index.html">lib.</a><a href="../index.html">pixi.</a><a href="index.html">maps.</a>GeoJson</h1>
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2019-11-04 10:59:08 +01:00
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<p>GeoJson is a standardized format of how to display geometry in a geographical context, using latitude/longitude
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pairs
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to display one (or multiple) Point, Line or Polygon.
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</p>
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<p> This implementation is roughly based on
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<a class="external" href="https://tools.ietf.org/html/rfc7946">RFC7946</a>.
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</p>
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<p>GeoJson objects consist of two objects:
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<ul>
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<li>type: The type of the object. All listed in the table below.</li>
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<li>coordinates: The coordinate point(s)* of which the object is composed.</li>
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</ul>
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The points are an array of exactly two values in the format [longitude, latitude]. Here the implementation
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breaks with the
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standardized format, as multiple point formats can be used for convenience (see
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<a href="#point">Point</a> section).
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</p>
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<table>
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<thead>
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<tr>
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<td>Type</td>
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<td>Implemented</td>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td>Point</td>
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<td>
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<span class="implemented"></span>
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</td>
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</tr>
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<tr>
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<td>Line</td>
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<td>
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<span class="implemented"></span>
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</td>
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</tr>
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<tr>
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<td>Polygon</td>
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<td>
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<span class="implemented"></span>
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</td>
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</tr>
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<tr>
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<td>MultiPoint</td>
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<td>
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<span class="not-implemented"></span>
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</td>
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</tr>
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<tr>
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<td>MultiLine</td>
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<td>
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<span class="not-implemented"></span>
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</td>
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</tr>
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<tr>
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<td>MultiPolygon</td>
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<td>
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<span class="implemented"></span>
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</td>
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</tr>
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</tbody>
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</table>
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</ul>
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<canvas id="canv_0"></canvas>
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<script>
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// As map an image of europe is used.
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let europe = "../../../../var/examples/maps/europe/europe.jpg"
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2019-12-11 16:45:26 +01:00
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let europeMapProjection = new MapProjection(MERCATOR, {
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2019-11-04 10:59:08 +01:00
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clip: {
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min: { x: 32.863294, y: -18.58 },
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max: { x: 57.467973, y: 44.277158 }
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}
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})
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let app = window.app = new MapApp({
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debug: true,
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view: canv_0,
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focus: { x: 46.053113042094864, y: 13.150212801583365 },
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zoom: 0.25,
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width: 880,
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height: 512,
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coordsLogging: true
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})
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// The sprites of image maps should be loaded by the
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// apps resources loader.
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app.loadTextures([europe], (textures) => ready(textures), { resolutionDependent: false })
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window.readyHandler = new EventHandler("onReady")
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function ready(textures) {
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2019-12-11 16:45:26 +01:00
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let europeMap = new ImageMap(new PIXI.Sprite(textures.get(europe)), europeMapProjection)
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2019-11-04 10:59:08 +01:00
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app.setMap("germany", europeMap)
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app.setup().run()
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readyHandler.call()
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}
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</script>
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<h2 id="point">Point</h2>
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<p>Points represent a single point on the map. In the following all valid coordinate types are shown</p>
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<script class="doctest">
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let geoJsonPoint = [
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{
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//Madrid - only valid GeoJson format.
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"type": "Point",
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"coordinates": [-3.701517, 40.417485]
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}, {
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//London - most clean version.
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"type": "Point",
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"coordinates": {
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"latitude": 51.508271,
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"longitude": -0.128505
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}
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},
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{
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//Wien - short version.
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"type": "Point",
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"coordinates": {
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"lat": 48.212156,
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"lng": 16.377807
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}
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},
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{
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//Athens - PIXI point in form {x: latitude, y: longitude}.
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"type": "Point",
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"coordinates": {
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"x": 37.971782,
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"y": 23.726510
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}
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}
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]
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</script>
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<h2>Line</h2>
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<p>The line can be used to show a path or connection between multiple points.</p>
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<script class="doctest">
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const places = {
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"Madrid": [-3.701517, 40.417485],
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"London": [-0.128505, 51.508271],
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"Wien": [16.377807, 48.212156],
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"Athens": [23.726510, 37.971782],
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}
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let geoJsonLine = {
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"type": "LineString",
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"coordinates": [
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places.Madrid,
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places.London,
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places.Wien,
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places.Athens
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]
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}
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</script>
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<h2>Polygon</h2>
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<p>Polygons are used to represent shapes. They are an array of two pointarrays. The first represent the shape, the
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optional
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second one a hole that can be cut into the shape.</p>
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<script class="doctest">
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let geoJsonPolygon = {
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"type": "Polygon",
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"coordinates": [
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[
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[14.220297, 53.948800],
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[14.098276, 52.869102],
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[14.792306, 50.835383],
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[12.267321, 50.160485],
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[13.864702, 48.732998],
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[12.957140, 47.509061],
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[10.222090, 47.331850],
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[7.615329, 47.578565],
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[8.240349, 48.981837],
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[6.431923, 49.474461],
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[6.521907, 49.810873],
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[5.998715, 51.837875],
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[7.012748, 52.396167],
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[7.294660, 53.673047],
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[8.979846, 53.896205],
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[8.644994, 54.895603],
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[9.917260, 54.808699],
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[11.042638, 53.970400],
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[13.226022, 54.471929]
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],
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[
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[12.364498326583373, 49.348267001730406],
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[12.364498326583373, 48.653439624053],
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[6.8644970015833735, 49.734852799255926,],
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[6.929973207833399, 50.49886609496484,]
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]
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]
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}
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</script>
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<h2>MultiPolygon</h2>
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<p>Multipolygons are an array of polygons.</p>
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<script class="doctest">
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let geoJsonMultiPolygon = {
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"type": "MultiPolygon",
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"coordinates": [
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[
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[
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[2.4534564721784875, 39.602018178422234],
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[3.2148986405775872, 39.944805466067685],
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[3.589576532964429, 39.73370002861697],
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[3.1967690651395344, 39.30481714119756],
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[2.9066958581303197, 39.389861165290846],
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[2.870436707254214, 39.55963858264072]
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]
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],
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[
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[
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[1.4261138640210334, 39.02533795687074],
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[1.6497119610906168, 39.12020148440332],
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[1.7645326055317128, 39.02293427288866],
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[1.5651072757129327, 38.877400666886004],
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[1.3898547131448993, 38.867887468083474],
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[1.3838115213322055, 38.972462606739654],
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[1.456329823084502, 38.9629621453345]
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]
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],
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[
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[
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[3.9340384662878307, 40.04714135355371],
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[3.970297617163993, 39.93948536023678],
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[4.109291028855864, 39.93011595102749],
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[4.399364235865022, 39.817583017567095],
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[4.405407427677716, 39.92543076543482],
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[4.254327632360457, 40.06584681024191],
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[3.9642544253512995, 40.06117092743255]
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]
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]
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]
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}
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</script>
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<h2>Applying GeoJson Objects to the Map</h2>
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<p>The GeoJson data is used to create a
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<a href="./geographics.html" target="_blank">GeoGraphics</a> object.</p>
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<script class="doctest">
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readyHandler.add(() => {
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// For this demo, we bundle all GeoJson types.
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let geographics = [].concat(geoJsonMultiPolygon, geoJsonPolygon, geoJsonLine, geoJsonPoint)
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// We need a geoLayer for the GeoGraphics to live on.
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// (Currently not working with the MapLayer itself. SO: 13-06-2018)
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let geoJsonLayer = new GeoLayer("GeoJson Layer")
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app.mapLayer.place(geoJsonLayer)
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// Add all items individually.
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geographics.forEach(geoJson => {
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const type = geoJson.type
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const geometry = geoJson.coordinates
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console.log(type, geometry)
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// Converts all points to PIXI format.
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let coordinates = GeoJson.validateAndConvert(type, geometry)
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console.log("Converted: ", type, geometry)
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// Use a Utils function to get an appropriate GeoGraphics for every type.
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let graphics = GeoUtils.fromGeoJsonToGeoGraphics(type, coordinates, {
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//The GeoGraphics shoul
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onDraw: GeoJson.isLineType(type) ? function () {
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this.graphics.lineStyle(10, 0x00FFFF)
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} : function () {
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this.graphics.beginFill(0xFF0000, 0.8)
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if (type == "MultiPolygon") {
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this.graphics.drawCircle(0, 0, 200)
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} else if (type == "Point") {
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this.graphics.drawCircle(0, 0, 50)
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}
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this.graphics.beginFill(0x00FF00)
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}
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})
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// Finally place the GeoGraphics element.
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geoJsonLayer.place(graphics)
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})
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geoJsonLayer.adapt()
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})
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</script>
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</body>
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</html>
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