2022-10-31 17:05:58 +00:00
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import react, { useState } from 'react';
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import { MapScope, Point } from './types';
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import Map from './Map';
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import Handlers from './Handlers';
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import { atom } from 'jotai';
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import { tileProviders } from './tile-providers';
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import { lon2tile, lat2tile, tile2lat, tile2long } from '../../lib/geo';
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2022-10-31 14:02:46 +00:00
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2022-10-31 17:05:58 +00:00
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/**
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* Definition of a coordinate system
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*
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* The coordinate system is shifted and zoomed (from the viewport origin)
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*
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*/
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export interface CoordinateSystem {
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/** Zoom relative to the origin */
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zoom: number;
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/** Origin's shift (in pixels) */
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shift: Point;
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}
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2022-10-31 17:05:58 +00:00
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const initialCoordinateSystem: CoordinateSystem = {
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zoom: 1,
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shift: { x: 0, y: 0 },
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};
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/** An atom to store the map coordinates system */
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export const coordinateSystemAtom = atom(initialCoordinateSystem);
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/**
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* Description of coordinates system transformation
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*/
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export interface Transformation {
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/** New translation to apply */
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deltaShift: Point | null;
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/** Zoom factor to apply */
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deltaZoom: number | null;
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/** Center of the new zoom to apply */
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zoomCenter: Point | null;
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}
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/**
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* A write only atom to translate and zoom the coordinate system
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*/
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export const relativeCoordinateSystemAtom = atom(
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null,
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(get, set, t: Transformation) => {
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const actualDeltaShift =
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t.deltaShift === null ? { x: 0, y: 0 } : t.deltaShift;
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const actualDeltaZoom = t.deltaZoom === null ? 1 : t.deltaZoom;
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const actualZoomCenter =
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t.zoomCenter === null ? { x: 0, y: 0 } : t.zoomCenter;
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const coordinateSystem = get(coordinateSystemAtom);
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var newCoordinateSystem = {
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shift: {
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x:
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coordinateSystem.shift.x +
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actualDeltaShift.x +
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(coordinateSystem.shift.x - actualZoomCenter.x) *
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(actualDeltaZoom - 1),
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y:
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coordinateSystem.shift.y +
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actualDeltaShift.y +
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(coordinateSystem.shift.y - actualZoomCenter.y) *
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(actualDeltaZoom - 1),
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},
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zoom: coordinateSystem.zoom * actualDeltaZoom,
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};
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set(coordinateSystemAtom, newCoordinateSystem);
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}
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);
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export interface LiveMapProperties {
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scope: MapScope;
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numberOfTiledLayers?: number;
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}
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export const LiveMap: react.FC<LiveMapProperties> = (
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props: LiveMapProperties
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) => {
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const [scope, setScope] = useState(props.scope);
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console.log(`LiveMap rendering: ${JSON.stringify(scope)}`);
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const transform = (t: Transformation) => {
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const deltaZoom = t.deltaZoom === null ? 1 : t.deltaZoom;
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const deltaZoomLevel = Math.log2(deltaZoom);
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const tileProvider = tileProviders[scope.tileProvider];
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const tilesZoom = Math.min(
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Math.max(Math.round(scope.zoom), tileProvider.minZoom),
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tileProvider.maxZoom
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);
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const softZoom = scope.zoom - tilesZoom;
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const relativeScale = 2 ** softZoom;
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const visibleTileSize = tileProvider.tileSize * relativeScale;
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// Values in pixels
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const actualDeltaShift =
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t.deltaShift === null ? { x: 0, y: 0 } : t.deltaShift;
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const actualZoomCenter =
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t.zoomCenter === null ? { x: 0, y: 0 } : t.zoomCenter;
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// Values in tiles (for the current zoom level)
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const actualDeltaShiftTiles = {
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x: actualDeltaShift.x / visibleTileSize,
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y: actualDeltaShift.y / visibleTileSize,
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};
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const actualZoomCenterTiles = {
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x: actualZoomCenter.x / visibleTileSize,
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y: actualZoomCenter.y / visibleTileSize,
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};
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const tilesCenter: Point = {
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x: lon2tile(scope.center.lon, tilesZoom),
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y: lat2tile(scope.center.lat, tilesZoom),
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};
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const newTilesCenter = {
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x:
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tilesCenter.x -
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actualDeltaShiftTiles.x -
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(window.innerWidth / 2 / visibleTileSize - actualZoomCenterTiles.x) *
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(deltaZoom - 1),
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y:
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tilesCenter.y -
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actualDeltaShiftTiles.y -
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(window.innerHeight / 2 / visibleTileSize - actualZoomCenterTiles.y) *
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(deltaZoom - 1),
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};
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const newScope: MapScope = {
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center: {
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lat: tile2lat(newTilesCenter.y, tilesZoom),
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lon: tile2long(newTilesCenter.x, tilesZoom),
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},
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zoom: deltaZoomLevel + scope.zoom,
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tileProvider: scope.tileProvider,
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};
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console.log(
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`LiveMap transform: ${JSON.stringify(t)}, ${JSON.stringify(
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scope
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)} -> ${JSON.stringify(newScope)}, delta lat: ${
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newScope.center.lat - scope.center.lat
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}, delta lon: ${newScope.center.lon - scope.center.lon}`
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);
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setScope(newScope);
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};
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return (
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<>
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<Handlers transformMap={transform} />
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<Map scope={scope} numberOfTiledLayers={props.numberOfTiledLayers} />
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</>
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);
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};
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export default LiveMap;
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