mapcomplete/Logic/FilteredLayer.ts

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import {TagsFilter, TagUtils} from "./Tags";
import {UIEventSource} from "./UIEventSource";
import * as L from "leaflet"
import {Layer} from "leaflet"
import {GeoOperations} from "./GeoOperations";
import {UIElement} from "../UI/UIElement";
import State from "../State";
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import LayerConfig from "../Customizations/JSON/LayerConfig";
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/***
* A filtered layer is a layer which offers a 'set-data' function
* It is initialized with a tagfilter.
*
* When geojson-data is given to 'setData', all the geojson matching the filter, is rendered on this layer.
* If it is not rendered, it is returned in a 'leftOver'-geojson; which can be consumed by the next layer.
*
* This also makes sure that no objects are rendered twice if they are applicable on two layers
*/
export class FilteredLayer {
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public readonly name: string | UIElement;
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public readonly filters: TagsFilter;
public readonly isDisplayed: UIEventSource<boolean> = new UIEventSource(true);
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private readonly combinedIsDisplayed: UIEventSource<boolean>;
public readonly layerDef: LayerConfig;
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private readonly _maxAllowedOverlap: number;
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private readonly _style: (properties) => { color: string, weight?: number, icon: { iconUrl: string, iconSize?: [number, number], popupAnchor?: [number, number], iconAnchor?: [number, number] } };
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/** The featurecollection from overpass
*/
private _dataFromOverpass: any[];
private readonly _wayHandling: number;
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/** List of new elements, geojson features
*/
private _newElements = [];
/**
* The leaflet layer object which should be removed on rerendering
*/
private _geolayer;
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private _showOnPopup: (tags: UIEventSource<any>, feature: any) => UIElement;
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constructor(
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layerDef: LayerConfig,
showOnPopup: ((tags: UIEventSource<any>, feature: any) => UIElement)
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) {
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this.layerDef = layerDef;
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this._wayHandling = layerDef.wayHandling;
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this._showOnPopup = showOnPopup;
this._style = (tags) => {
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const iconUrl = layerDef.icon?.GetRenderValue(tags)?.txt ?? "./assets/bug.svg";
const iconSize = (layerDef.iconSize?.GetRenderValue(tags)?.txt ?? "40,40,center").split(",");
const dashArray = layerDef.dashArray.GetRenderValue(tags)?.txt.split(" ").map(Number);
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function num(str, deflt = 40) {
const n = Number(str);
if (isNaN(n)) {
return deflt;
}
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return n;
}
const iconW = num(iconSize[0]);
const iconH = num(iconSize[1]);
const mode = iconSize[2] ?? "center"
let anchorW = iconW / 2;
let anchorH = iconH / 2;
if (mode === "left") {
anchorW = 0;
}
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if (mode === "right") {
anchorW = iconW;
}
if (mode === "top") {
anchorH = 0;
}
if (mode === "bottom") {
anchorH = iconH;
}
const color = layerDef.color?.GetRenderValue(tags)?.txt ?? "#00f";
let weight = num(layerDef.width?.GetRenderValue(tags)?.txt, 5);
return {
icon:
{
iconUrl: iconUrl,
iconSize: [iconW, iconH],
iconAnchor: [anchorW, anchorH],
popupAnchor: [0, 3 - anchorH]
},
color: color,
weight: weight,
dashArray: dashArray
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};
};
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this.name = name;
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this.filters = layerDef.overpassTags;
this._maxAllowedOverlap = layerDef.hideUnderlayingFeaturesMinPercentage;
const self = this;
this.combinedIsDisplayed = this.isDisplayed.map<boolean>(isDisplayed => {
return isDisplayed && State.state.locationControl.data.zoom >= self.layerDef.minzoom
},
[State.state.locationControl]
);
this.combinedIsDisplayed.addCallback(function (isDisplayed) {
const map = State.state.bm.map;
if (self._geolayer !== undefined && self._geolayer !== null) {
if (isDisplayed) {
self._geolayer.addTo(map);
} else {
map.removeLayer(self._geolayer);
}
}
})
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}
static fromDefinition(
definition,
showOnPopup: (tags: UIEventSource<any>, feature: any) => UIElement):
FilteredLayer {
return new FilteredLayer(
definition, showOnPopup);
}
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/**
* The main function to load data into this layer.
* The data that is NOT used by this layer, is returned as a geojson object; the other data is rendered
*/
public SetApplicableData(geojson: any): any {
const leftoverFeatures = [];
const selfFeatures = [];
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for (let feature of geojson.features) {
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// feature.properties contains all the properties
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const tags = TagUtils.proprtiesToKV(feature.properties);
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if (!this.filters.matches(tags)) {
leftoverFeatures.push(feature);
continue;
}
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if (feature.geometry.type !== "Point") {
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const centerPoint = GeoOperations.centerpoint(feature);
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if (this._wayHandling === LayerConfig.WAYHANDLING_CENTER_AND_WAY) {
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selfFeatures.push(centerPoint);
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} else if (this._wayHandling === LayerConfig.WAYHANDLING_CENTER_ONLY) {
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feature = centerPoint;
}
}
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selfFeatures.push(feature);
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}
this.RenderLayer({
type: "FeatureCollection",
features: selfFeatures
})
const notShadowed = [];
for (const feature of leftoverFeatures) {
if (this._maxAllowedOverlap !== undefined && this._maxAllowedOverlap > 0) {
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if (GeoOperations.featureIsContainedInAny(feature, selfFeatures, this._maxAllowedOverlap)) {
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// This feature is filtered away
continue;
}
}
notShadowed.push(feature);
}
return {
type: "FeatureCollection",
features: notShadowed
};
}
public AddNewElement(element) {
this._newElements.push(element);
this.RenderLayer({features: this._dataFromOverpass}, element); // Update the layer
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}
private RenderLayer(data, openPopupOf = undefined) {
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let self = this;
if (this._geolayer !== undefined && this._geolayer !== null) {
// Remove the old geojson layer from the map - we'll reshow all the elements later on anyway
State.state.bm.map.removeLayer(this._geolayer);
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}
const oldData = this._dataFromOverpass ?? [];
// We keep track of all the ids that are freshly loaded in order to avoid adding duplicates
const idsFromOverpass: Set<number> = new Set<number>();
// A list of all the features to show
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const fusedFeatures = [];
// First, we add all the fresh data:
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for (const feature of data.features) {
idsFromOverpass.add(feature.properties.id);
fusedFeatures.push(feature);
}
// Now we add all the stale data
for (const feature of oldData) {
if (idsFromOverpass.has(feature.properties.id)) {
continue; // Feature already loaded and a fresher version is available
}
idsFromOverpass.add(feature.properties.id);
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fusedFeatures.push(feature);
}
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this._dataFromOverpass = fusedFeatures;
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for (const feature of this._newElements) {
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if (!idsFromOverpass.has(feature.properties.id)) {
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// This element is not yet uploaded or not yet visible in overpass
// We include it in the layer
fusedFeatures.push(feature);
}
}
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// We use a new, fused dataset
data = {
type: "FeatureCollection",
features: fusedFeatures
}
// The data is split in two parts: the poinst and the rest
// The points get a special treatment in order to render them properly
// Note that some features might get a point representation as well
const runWhenAdded: (() => void)[] = []
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this._geolayer = L.geoJSON(data, {
style: function (feature) {
return self._style(feature.properties);
},
pointToLayer: function (feature, latLng) {
const style = self._style(feature.properties);
let marker;
if (style.icon === undefined) {
marker = L.circle(latLng, {
radius: 25,
color: style.color
});
} else if (style.icon.iconUrl.startsWith("$circle")) {
marker = L.circle(latLng, {
radius: 25,
color: style.color
});
} else {
if (style.icon.iconSize === undefined) {
style.icon.iconSize = [50, 50]
}
// @ts-ignore
marker = L.marker(latLng, {
icon: L.icon(style.icon),
});
}
let eventSource = State.state.allElements.addOrGetElement(feature);
const popup = L.popup({}, marker);
let uiElement: UIElement;
let content = undefined;
let p = marker.bindPopup(popup)
.on("popupopen", () => {
if (content === undefined) {
uiElement = self._showOnPopup(eventSource, feature);
// Lazily create the content
content = uiElement.Render();
}
popup.setContent(content);
uiElement.Update();
});
if (feature === openPopupOf) {
runWhenAdded.push(() => {
p.openPopup();
})
}
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return marker;
},
onEachFeature: function (feature, layer:Layer) {
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// We monky-patch the feature element with an update-style
function updateStyle () {
// @ts-ignore
if (layer.setIcon) {
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const style = self._style(feature.properties);
const icon = style.icon;
if (icon.iconUrl) {
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if (icon.iconUrl.startsWith("$circle")) {
// pass
} else {
// @ts-ignore
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layer.setIcon(L.icon(icon))
}
}
} else {
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self._geolayer.setStyle(function (featureX) {
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return self._style(featureX.properties);
});
}
}
let eventSource = State.state.allElements.addOrGetElement(feature);
eventSource.addCallback(updateStyle);
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function openPopup(e) {
State.state.selectedElement.setData({feature: feature});
updateStyle()
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if (feature.geometry.type === "Point") {
return; // Points bind there own popups
}
const uiElement = self._showOnPopup(eventSource, feature);
L.popup({
autoPan: true,
}).setContent(uiElement.Render())
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.setLatLng(e.latlng)
.openOn(State.state.bm.map);
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uiElement.Update();
if (e) {
L.DomEvent.stop(e); // Marks the event as consumed
}
}
layer.on("click", openPopup);
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}
});
if (this.combinedIsDisplayed.data) {
this._geolayer.addTo(State.state.bm.map);
for (const f of runWhenAdded) {
f();
}
}
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}
}