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Lazy load Maplibre GL JS and add hillshading layer
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,64 @@ | ||
| /** | ||
| * Only load Maplibre bundles when layer is actually added, using dynamic imports | ||
| */ | ||
| BR.MaplibreGlLazyLoader = L.Layer.extend({ | ||
| initialize: function (options) { | ||
| this.options = options; | ||
| }, | ||
|
|
||
| onAdd: function (map) { | ||
| if (!('maplibreGL' in L)) { | ||
| this._load(); | ||
| } else { | ||
| this._addGlLayer(); | ||
| } | ||
| return this; | ||
| }, | ||
|
|
||
| onRemove: function (map) { | ||
| this._map.removeLayer(this.glLayer); | ||
| this.glLayer = null; | ||
| return this; | ||
| }, | ||
|
|
||
| // needed when overlay, also requires `position: absolute` (see css) | ||
| setZIndex: function (zIndex) { | ||
| this.options.zIndex = zIndex; | ||
| return this; | ||
| }, | ||
|
|
||
| setOpacity: function (opacity) { | ||
| if (this.glLayer) { | ||
| const glMap = this.glLayer.getMaplibreMap(); | ||
| if (glMap.getLayer('hillshading')) { | ||
| glMap.setPaintProperty('hillshading', 'hillshade-exaggeration', opacity); | ||
| } else { | ||
| glMap.getCanvas().style.opacity = opacity; | ||
| } | ||
| } | ||
| }, | ||
|
|
||
| _load: async function () { | ||
| await import('./maplibre-gl.js'); | ||
| await import('./leaflet-maplibre-gl.js'); | ||
|
|
||
| this._addGlLayer(); | ||
| }, | ||
|
|
||
| _addGlLayer: function () { | ||
| this.glLayer = L.maplibreGL(this.options); | ||
| this._map.addLayer(this.glLayer); | ||
|
|
||
| this._updateZIndex(); | ||
| }, | ||
|
|
||
| _updateZIndex: function () { | ||
| if (this.glLayer && this.glLayer.getContainer() && this.options.zIndex != null) { | ||
| this.glLayer.getContainer().style.zIndex = this.options.zIndex; | ||
| } | ||
| }, | ||
| }); | ||
|
|
||
| BR.maplibreGlLazyLoader = function (options) { | ||
| return new BR.MaplibreGlLazyLoader(options); | ||
| }; |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,21 @@ | ||
| { | ||
| "version": 8, | ||
| "sources": { | ||
| "dem": { | ||
| "type": "raster-dem", | ||
| "tiles": [ | ||
| "https://s3.amazonaws.com/elevation-tiles-prod/terrarium/{z}/{x}/{y}.png" | ||
| ], | ||
| "encoding": "terrarium", | ||
| "tileSize": 256, | ||
| "maxzoom": 15 | ||
| } | ||
| }, | ||
| "layers": [ | ||
| { | ||
| "id": "hillshading", | ||
| "source": "dem", | ||
| "type": "hillshade" | ||
| } | ||
| ] | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,15 @@ | ||
| { | ||
| "geometry": null, | ||
| "properties": { | ||
| "attribution": { | ||
| "text": "Terrain Tiles from AWS", | ||
| "url": "https://registry.opendata.aws/terrain-tiles/" | ||
| }, | ||
| "id": "terrarium-hillshading", | ||
| "name": "Hillshading", | ||
| "overlay": true, | ||
| "type": "mvt", | ||
| "url": "terrarium-hillshading-style" | ||
| }, | ||
| "type": "Feature" | ||
| } |
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