85 lines
3 KiB
TypeScript
85 lines
3 KiB
TypeScript
import DynamicTileSource from "./DynamicTileSource"
|
|
import { Store, UIEventSource } from "../../UIEventSource"
|
|
import { BBox } from "../../BBox"
|
|
import StaticFeatureSource from "../Sources/StaticFeatureSource"
|
|
import { Feature, Point } from "geojson"
|
|
import { Utils } from "../../../Utils"
|
|
import { Tiles } from "../../../Models/TileRange"
|
|
|
|
/**
|
|
* Provides features summarizing the total amount of features at a given location
|
|
*/
|
|
export class SummaryTileSource extends DynamicTileSource {
|
|
private static readonly empty = []
|
|
constructor(
|
|
cacheserver: string,
|
|
layers: string[],
|
|
zoomRounded: Store<number>,
|
|
mapProperties: {
|
|
bounds: Store<BBox>
|
|
zoom: Store<number>
|
|
},
|
|
options?: {
|
|
isActive?: Store<boolean>
|
|
}
|
|
) {
|
|
const layersSummed = layers.join("+")
|
|
super(
|
|
zoomRounded,
|
|
0, // minzoom
|
|
(tileIndex) => {
|
|
const [z, x, y] = Tiles.tile_from_index(tileIndex)
|
|
const coordinates = Tiles.centerPointOf(z, x, y)
|
|
|
|
const count = UIEventSource.FromPromiseWithErr(
|
|
Utils.downloadJson(`${cacheserver}/${layersSummed}/${z}/${x}/${y}.json`)
|
|
)
|
|
const features: Store<Feature<Point>[]> = count.mapD((count) => {
|
|
if (count["error"] !== undefined) {
|
|
console.error(
|
|
"Could not download count for tile",
|
|
z,
|
|
x,
|
|
y,
|
|
"due to",
|
|
count["error"]
|
|
)
|
|
return SummaryTileSource.empty
|
|
}
|
|
const counts = count["success"]
|
|
if (counts === undefined || counts["total"] === 0) {
|
|
return SummaryTileSource.empty
|
|
}
|
|
return [
|
|
{
|
|
type: "Feature",
|
|
properties: {
|
|
id: "summary_" + tileIndex,
|
|
summary: "yes",
|
|
...counts,
|
|
layers: layersSummed,
|
|
},
|
|
geometry: {
|
|
type: "Point",
|
|
coordinates,
|
|
},
|
|
},
|
|
]
|
|
})
|
|
return new StaticFeatureSource(
|
|
features.map(
|
|
(f) => {
|
|
if (z !== zoomRounded.data) {
|
|
return SummaryTileSource.empty
|
|
}
|
|
return f
|
|
},
|
|
[zoomRounded]
|
|
)
|
|
)
|
|
},
|
|
mapProperties,
|
|
options
|
|
)
|
|
}
|
|
}
|