MVT Tile Layer #3935
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,66 @@ | ||
| import {Matrix4} from 'math.gl'; | ||
| import {MVTLoader} from '@loaders.gl/mvt'; | ||
| import {load} from '@loaders.gl/core'; | ||
| import {COORDINATE_SYSTEM} from '@deck.gl/core'; | ||
| import {GeoJsonLayer} from '@deck.gl/layers'; | ||
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| import TileLayer from '../tile-layer/tile-layer'; | ||
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| const defaultProps = Object.assign({}, TileLayer.defaultProps, { | ||
| renderSubLayers: {type: 'function', value: renderSubLayers, compare: false}, | ||
| urlTemplates: [] | ||
| }); | ||
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| export default class MVTTileLayer extends TileLayer { | ||
| initializeState() { | ||
| super.initializeState(); | ||
| const {urlTemplates} = this.props; | ||
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| this.state = { | ||
| ...this.state, | ||
| urlTemplates | ||
| }; | ||
| } | ||
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| async getTileData(tileProperties) { | ||
| const {urlTemplates} = this.state; | ||
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| if (!urlTemplates || !urlTemplates.length) { | ||
| return Promise.reject(); | ||
| } | ||
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| const templateReplacer = (_, property) => tileProperties[property]; | ||
| const tileURLIndex = getTileURLIndex(tileProperties, urlTemplates.length); | ||
| const tileURL = urlTemplates[tileURLIndex].replace(/\{ *([\w_-]+) *\}/g, templateReplacer); | ||
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| return await load(tileURL, MVTLoader); | ||
| } | ||
| } | ||
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| function renderSubLayers(tileProperties) { | ||
| return new GeoJsonLayer({ | ||
| ...tileProperties, | ||
| modelMatrix: getModelMatrix(tileProperties.tile), | ||
| coordinateSystem: COORDINATE_SYSTEM.CARTESIAN | ||
| }); | ||
| } | ||
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| function getModelMatrix(tile) { | ||
| const WORLD_SIZE = 512; | ||
| const worldScale = Math.pow(2, tile.z); | ||
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| const xScale = WORLD_SIZE / worldScale; | ||
| const yScale = -xScale; | ||
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| const xOffset = (WORLD_SIZE * tile.x) / worldScale; | ||
| const yOffset = WORLD_SIZE * (1 - tile.y / worldScale); | ||
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| return new Matrix4().translate([xOffset, yOffset, 0]).scale([xScale, yScale, 1]); | ||
| } | ||
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| function getTileURLIndex({x, y}, templatesLength) { | ||
|
There was a problem hiding this comment. Is this a standard schema? If yes, can you add a link to its specs? Otherwise, should we allow users to customize this? There was a problem hiding this comment. It's used to bypass Domain Sharding when HTTP 2 is not available. The user can provide N tiles endpoint and this function does the splitting to each one. The tilejson spec defines a // REQUIRED. An array of tile endpoints. {z}, {x} and {y}, if present,
// are replaced with the corresponding integers. If multiple endpoints are specified, clients
// may use any combination of endpoints. All endpoints MUST return the same
// content for the same URL. The array MUST contain at least one endpoint.
"tiles": [
"http://localhost:8888/admin/1.0.0/world-light,broadband/{z}/{x}/{y}.png"
] |
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| return Math.abs(x + y) % templatesLength; | ||
| } | ||
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| MVTTileLayer.layerName = 'MVTTileLayer'; | ||
| MVTTileLayer.defaultProps = defaultProps; | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,18 @@ | ||
| import test from 'tape-catch'; | ||
| import {generateLayerTests, testLayer} from '@deck.gl/test-utils'; | ||
| import {MVTTileLayer} from '@deck.gl/geo-layers'; | ||
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| test('MVTTileLayer', t => { | ||
| const testCases = generateLayerTests({ | ||
| Layer: MVTTileLayer, | ||
| assert: t.ok, | ||
| sampleProps: { | ||
| urlTemplates: [ | ||
| 'https://a.basemaps.cartocdn.com/rastertiles/voyager_labels_under/{z}/{x}/{y}.png' | ||
| ] | ||
| }, | ||
| onBeforeUpdate: ({testCase}) => t.comment(testCase.title) | ||
| }); | ||
| testLayer({Layer: MVTTileLayer, testCases, onError: t.notOk}); | ||
| t.end(); | ||
| }); |
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Start a documentation page in
docs/layers?There was a problem hiding this comment.
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Good point!