130 lines
3.3 KiB
TypeScript
130 lines
3.3 KiB
TypeScript
import maplibregl from "maplibre-gl";
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import { Geometry } from "@/lib/useEditorState";
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type ModeGetter = () => "idle" | "draw" | "select" | "add-point" | "add-line" | "add-path" | "add-circle";
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const EMPTY_PREVIEW: GeoJSON.FeatureCollection = {
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type: "FeatureCollection",
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features: [],
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};
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export function initPath(
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map: maplibregl.Map,
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getMode: ModeGetter,
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onComplete: (geometry: Geometry) => void
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) {
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let coords: [number, number][] = [];
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const clearPreview = () => {
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(map.getSource("draw-path-preview") as maplibregl.GeoJSONSource | undefined)?.setData(
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EMPTY_PREVIEW
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);
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};
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const updatePreview = (lineCoords: [number, number][]) => {
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if (lineCoords.length < 2) {
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clearPreview();
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return;
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}
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(map.getSource("draw-path-preview") as maplibregl.GeoJSONSource | undefined)?.setData({
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type: "FeatureCollection",
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features: [
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{
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type: "Feature",
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properties: {},
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geometry: {
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type: "LineString",
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coordinates: lineCoords,
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},
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},
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],
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});
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};
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const finishPath = () => {
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if (getMode() !== "add-path" || coords.length < 2) return;
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const geometry: Geometry = {
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type: "LineString",
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coordinates: [...coords],
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};
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onComplete(geometry);
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coords = [];
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clearPreview();
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};
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const cancelPath = () => {
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coords = [];
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clearPreview();
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};
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const removeLastVertex = () => {
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if (coords.length === 0) return;
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coords = coords.slice(0, -1);
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updatePreview(coords);
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};
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const onClick = (e: maplibregl.MapLayerMouseEvent) => {
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if (getMode() !== "add-path") return;
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coords.push([e.lngLat.lng, e.lngLat.lat]);
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updatePreview(coords);
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};
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const onMove = (e: maplibregl.MapLayerMouseEvent) => {
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const canvas = map.getCanvas();
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if (getMode() !== "add-path") {
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if (coords.length) {
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cancelPath();
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}
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if (canvas.style.cursor === "crosshair") {
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canvas.style.cursor = "";
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}
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return;
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}
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canvas.style.cursor = "crosshair";
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if (coords.length === 0) return;
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updatePreview([...coords, [e.lngLat.lng, e.lngLat.lat]]);
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};
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const onKeyDown = (e: KeyboardEvent) => {
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if (getMode() !== "add-path") return;
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if (e.key === "Enter") {
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e.preventDefault();
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finishPath();
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return;
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}
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if (e.key === "Escape") {
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e.preventDefault();
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cancelPath();
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return;
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}
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if (e.key === "Backspace") {
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e.preventDefault();
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removeLastVertex();
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}
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};
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map.on("click", onClick);
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map.on("mousemove", onMove);
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document.addEventListener("keydown", onKeyDown);
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return () => {
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map.off("click", onClick);
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map.off("mousemove", onMove);
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document.removeEventListener("keydown", onKeyDown);
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clearPreview();
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if (map.getCanvas().style.cursor === "crosshair") {
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map.getCanvas().style.cursor = "";
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}
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};
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}
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