dyomedea/src/components/map/Map.tsx

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import react, { useCallback } from 'react';
import { atom, useAtom } from 'jotai';
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import Handlers from './Handlers';
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import Tile from './Tile';
import TiledLayer from './TiledLayer';
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import { Point, TileFactory } from './types';
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export interface MapProperties {}
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/**
* Definition of a coordinate system
*
* The coordinate system is shifted and zoomed (from the viewport origin)
*
*/
export interface CoordinateSystem {
/** Zoom relative to the origin */
zoom: number;
/** Origin's shift (in pixels) */
shift: Point;
}
const initialCoordinateSystem: CoordinateSystem = {
zoom: 1,
shift: { x: 0, y: 0 },
};
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/** An atom to store the map coordinates system */
export const coordinateSystemAtom = atom(initialCoordinateSystem);
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/**
* Description of coordinates system transformation
*/
export interface Transformation {
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/** New translation to apply */
deltaShift: Point | null;
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/** Zoom factor to apply */
deltaZoom: number | null;
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/** Center of the new zoom to apply */
zoomCenter: Point | null;
}
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/**
* A write only atom to translate and zoom the coordinate system
*/
export const relativeCoordinateSystemAtom = atom(
null,
(get, set, t: Transformation) => {
const actualDeltaShift =
t.deltaShift === null ? { x: 0, y: 0 } : t.deltaShift;
const actualDeltaZoom = t.deltaZoom === null ? 1 : t.deltaZoom;
const actualZoomCenter =
t.zoomCenter === null ? { x: 0, y: 0 } : t.zoomCenter;
const coordinateSystem = get(coordinateSystemAtom);
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var newCoordinateSystem = {
shift: {
x:
coordinateSystem.shift.x +
actualDeltaShift.x +
(coordinateSystem.shift.x - actualZoomCenter.x) *
(actualDeltaZoom - 1),
y:
coordinateSystem.shift.y +
actualDeltaShift.y +
(coordinateSystem.shift.y - actualZoomCenter.y) *
(actualDeltaZoom - 1),
},
zoom: coordinateSystem.zoom * actualDeltaZoom,
};
set(coordinateSystemAtom, newCoordinateSystem);
}
);
/**
*
* @returns A Map component
*/
export const Map: react.FC<MapProperties> = (props: MapProperties) => {
const [coordinateSystem, setCoordinateSystem] = useAtom(coordinateSystemAtom);
const simpleTileFactory: TileFactory = useCallback(
(keyObject) => (
<Tile
href={`https://tile.openstreetmap.org/${keyObject.zoomLevel}/${keyObject.x}/${keyObject.y}.png`}
/>
),
[]
);
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const viewPort = {
topLeft: {
x: Math.floor(-coordinateSystem.shift.x / coordinateSystem.zoom / 256),
y: Math.floor(-coordinateSystem.shift.y / coordinateSystem.zoom / 256),
},
bottomRight: {
x: Math.ceil(
(-coordinateSystem.shift.x + window.innerWidth) /
coordinateSystem.zoom /
256
),
y: Math.ceil(
(-coordinateSystem.shift.y + window.innerHeight) /
coordinateSystem.zoom /
256
),
},
};
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return (
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<>
<Handlers />
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<svg width={window.innerWidth} height={window.innerHeight}>
<g
transform={`translate(${coordinateSystem.shift.x}, ${coordinateSystem.shift.y}) scale(${coordinateSystem.zoom})`}
>
<g transform='scale(256)'>
<TiledLayer
keyObject={{ provider: 'osm', zoomLevel: 16, x: 33485, y: 23936 }}
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viewPort={viewPort}
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tileFactory={simpleTileFactory}
/>
</g>
</g>
</svg>
</>
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);
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};
export default Map;