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86 lines
2 KiB
JavaScript
86 lines
2 KiB
JavaScript
import { BaseLayer } from './base_layer'
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/**
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* Heatmap layer showing point density
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* Uses MapLibre's native heatmap for performance
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* Fixed radius: 20 pixels
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*/
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export class HeatmapLayer extends BaseLayer {
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constructor(map, options = {}) {
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super(map, { id: 'heatmap', ...options })
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this.radius = 20 // Fixed radius
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this.weight = options.weight || 1
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this.intensity = 1 // Fixed intensity
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this.opacity = options.opacity || 0.6
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}
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getSourceConfig() {
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return {
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type: 'geojson',
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data: this.data || {
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type: 'FeatureCollection',
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features: []
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}
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}
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}
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getLayerConfigs() {
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return [
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{
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id: this.id,
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type: 'heatmap',
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source: this.sourceId,
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paint: {
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// Increase weight as diameter increases
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'heatmap-weight': [
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'interpolate',
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['linear'],
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['get', 'weight'],
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0, 0,
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6, 1
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],
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// Increase intensity as zoom increases
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'heatmap-intensity': [
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'interpolate',
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['linear'],
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['zoom'],
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0, this.intensity,
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9, this.intensity * 3
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],
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// Color ramp from blue to red
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'heatmap-color': [
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'interpolate',
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['linear'],
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['heatmap-density'],
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0, 'rgba(33,102,172,0)',
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0.2, 'rgb(103,169,207)',
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0.4, 'rgb(209,229,240)',
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0.6, 'rgb(253,219,199)',
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0.8, 'rgb(239,138,98)',
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1, 'rgb(178,24,43)'
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],
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// Fixed radius adjusted by zoom level
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'heatmap-radius': [
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'interpolate',
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['linear'],
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['zoom'],
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0, this.radius,
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9, this.radius * 3
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],
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// Transition from heatmap to circle layer by zoom level
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'heatmap-opacity': [
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'interpolate',
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['linear'],
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['zoom'],
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7, this.opacity,
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9, 0
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]
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}
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}
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]
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}
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}
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