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import { userLocationMaxRadius, userLocationMinRadius } from "appConstants";
import classNames from "classnames";
import Map from "components/Map";
import MapSearch from "components/MapSearch";
import TextField from "components/TextField";
import maplibregl, {
GeoJSONSource,
LngLat,
MapMouseEvent,
MapTouchEvent,
} from "maplibre-gl";
import React, { useRef, useState } from "react";
import makeStyles from "utils/makeStyles";
import {
DISPLAY_LOCATION,
DISPLAY_LOCATION_NOT_EMPTY,
getRadiusText,
INVALID_COORDINATE,
LOCATION_ACCURACY,
LOCATION_PUBLICLY_VISIBLE,
LOCATION_WARN,
MAP_IS_BLANK,
} from "./constants";
const useStyles = makeStyles({
root: {
margin: "auto",
maxWidth: 700,
},
map: {
height: 400,
position: "relative",
},
grow: {
height: "100%",
width: "100%",
},
displayLocation: {
width: "100%",
},
});
export interface ApproximateLocation {
address: string;
lat: number;
lng: number;
radius: number;
}
export interface EditLocationMapProps extends BoxProps {
initialLocation?: ApproximateLocation;
// this function is called on mouse release
updateLocation: (value: ApproximateLocation | null) => void;
grow?: boolean;
// whether to hide the radius slider
showRadiusSlider?: boolean;
// whether we are selecting an exact point (for pages, etc) or approx circle, doesn't maeks ense with radius slider
exact?: boolean;
}
export default function EditLocationMap({
initialLocation,
updateLocation,
className,
grow,
showRadiusSlider,
exact,
...otherProps
}: EditLocationMapProps) {
const classes = useStyles();
const theme = useTheme();
const [error, setError] = useState("");
const map = useRef<maplibregl.Map | null>(null);
// map is imperative so these don't need to cause re-render
const location = useRef<ApproximateLocation>({
address: initialLocation?.address ?? "",
radius: initialLocation?.radius ?? (exact ? 0 : 250),
lat: initialLocation?.lat ?? 0,
lng: initialLocation?.lng ?? 0,
});
// have not selected a location in any way yet
const isBlank = useRef<boolean>(
!(initialLocation?.lng || initialLocation?.lat)
);
const locationDisplayRef = useRef<HTMLInputElement>(null);
const [shrinkLabel, setShrinkLabel] = useState(
location.current.address !== ""
);
const onCircleMouseDown = (e: MapMouseEvent | MapTouchEvent) => {
Iif (!map.current) return;
// Prevent the default map drag behavior.
e.preventDefault();
map.current.getCanvas().style.cursor = "grab";
if (e.type === "touchstart") {
const handleTouchMove = (e: MapMouseEvent | MapTouchEvent) =>
onCircleMove(e);
map.current.on("touchmove", handleTouchMove);
map.current.once("touchend", (e) =>
handleCoordinateMoved(e, handleTouchMove)
);
} else {
const handleMove = (e: MapMouseEvent | MapTouchEvent) => onCircleMove(e);
map.current.on("mousemove", handleMove);
map.current.once("mouseup", (e) => handleCoordinateMoved(e, handleMove));
}
};
const onCircleMove = (e: MapMouseEvent | MapTouchEvent) => {
const wrapped = e.lngLat.wrap();
commit(
{
lat: wrapped.lat,
lng: wrapped.lng,
},
false
);
redrawMap();
};
const handleCoordinateMoved = (
e: MapMouseEvent | MapTouchEvent,
moveHandler: (x: MapMouseEvent | MapTouchEvent) => void = () => null
) => {
Iif (!map.current) return;
map.current.off("mousemove", moveHandler);
map.current.off("touchmove", moveHandler);
map.current.getCanvas().style.cursor = "move";
const wrapped = e.lngLat.wrap();
commit({
lat: wrapped.lat,
lng: wrapped.lng,
});
if (!isBlank.current) {
map.current.setLayoutProperty("circle", "visibility", "visible");
}
redrawMap();
};
const redrawMap = () => {
Iif (!map.current) return;
if (!exact) {
(map.current.getSource("circle") as GeoJSONSource).setData(
circleGeoJson(extractLngLat(location.current), location.current.radius)
);
} else E{
(map.current.getSource("circle") as GeoJSONSource).setData(
pointGeoJson(extractLngLat(location.current))
);
}
};
const commit = (
updates: Partial<ApproximateLocation>,
shouldUpdate = true
) => {
const addressNotEmpty = !!updates.address;
if (updates.address !== undefined) {
setShrinkLabel(addressNotEmpty);
location.current.address = updates.address;
}
Iif (updates.radius !== undefined && !exact) {
location.current.radius = updates.radius;
}
Iif (updates.lat !== undefined && updates.lng !== undefined) {
location.current.lat = updates.lat;
location.current.lng = updates.lng;
isBlank.current = false;
}
if (shouldUpdate) {
Iif (isBlank.current) {
// haven't selected a location yet
setError(addressNotEmpty ? MAP_IS_BLANK : "");
updateLocation(null);
} else Iif (location.current.lat === 0 && location.current.lng === 0) {
// somehow have lat/lng == 0
setError(INVALID_COORDINATE);
updateLocation(null);
} else Iif (location.current.address === "") {
// missing display address
setError(DISPLAY_LOCATION_NOT_EMPTY);
setShrinkLabel(false);
updateLocation(null);
} else {
setError("");
setShrinkLabel(true);
updateLocation({ ...location.current });
}
}
};
const initializeMap = (mapRef: maplibregl.Map) => {
map.current = mapRef;
map.current.once("load", () => {
Iif (!map.current) return;
if (!exact) {
map.current.addSource("circle", {
data: circleGeoJson(
extractLngLat(location.current),
location.current.radius
),
type: "geojson",
});
map.current.addLayer({
id: "circle",
layout: {
visibility: isBlank.current ? "none" : "visible",
},
paint: {
"fill-color": theme.palette.primary.main,
"fill-opacity": 0.5,
},
source: "circle",
type: "fill",
});
} else {
map.current.addSource("circle", {
data: pointGeoJson(extractLngLat(location.current)),
type: "geojson",
});
map.current.addLayer({
id: "circle",
layout: {
visibility: isBlank.current ? "none" : "visible",
},
paint: {
"circle-color": theme.palette.primary.main,
"circle-radius": 8,
"circle-stroke-color": "#fff",
"circle-stroke-width": 1,
},
source: "circle",
type: "circle",
});
}
// if no user is specified, ask to get the location from browser
Iif (!initialLocation && navigator.geolocation) {
navigator.geolocation.getCurrentPosition((position) => {
flyToSearch(
new LngLat(position.coords.longitude, position.coords.latitude)
);
});
}
});
const onDblClick = (e: MapMouseEvent & maplibregl.EventData) => {
e.preventDefault();
handleCoordinateMoved(e);
};
map.current.on("dblclick", onDblClick);
const onCircleTouch = (
e: MapTouchEvent & {
features?: maplibregl.MapboxGeoJSONFeature[] | undefined;
} & maplibregl.EventData
) => {
Iif (e.points.length !== 1) return;
onCircleMouseDown(e);
};
map.current.on("mousedown", "circle", onCircleMouseDown);
map.current.on("touchstart", "circle", onCircleTouch);
const canvas = map.current.getCanvas();
const setCursorMove = () => (canvas.style.cursor = "move");
const unsetCursor = () => (canvas.style.cursor = "");
map.current.on("mouseenter", "circle", setCursorMove);
map.current.on("mouseleave", "circle", unsetCursor);
};
const flyToSearch = (coords: LngLat) => {
Iif (!map.current) return;
map.current.flyTo({ center: coords, zoom: 12.5 });
if (!exact) {
const randomizedLocation = displaceLngLat(
coords,
Math.random() * location.current.radius,
Math.random() * 2 * Math.PI
);
handleCoordinateMoved({
lngLat: randomizedLocation,
} as MapMouseEvent);
} else E{
handleCoordinateMoved({
lngLat: coords,
} as MapMouseEvent);
}
};
return (
<>
<div
className={classNames(
classes.root,
{ [classes.grow]: grow },
className
)}
>
<div className={classNames(classes.map)}>
<Map
// (10, 35, 0.5) is just a pretty view
initialZoom={isBlank.current ? 0.5 : 12.5}
initialCenter={
isBlank.current
? new LngLat(10, 35)
: extractLngLat(location.current)
}
postMapInitialize={initializeMap}
grow
{...otherProps}
/>
<MapSearch
setError={setError}
setResult={(coordinate, _, simplified) => {
commit({ address: simplified }, false);
if (locationDisplayRef.current) {
locationDisplayRef.current.value = simplified;
setShrinkLabel(true);
}
flyToSearch(coordinate);
}}
/>
</div>
{showRadiusSlider && (
<RadiusSlider
commit={commit}
initialRadius={location.current.radius}
redrawMap={redrawMap}
/>
)}
<TextField
defaultValue={location.current.address}
onChange={(e) => {
commit({ address: e.target.value });
}}
error={error !== ""}
id="display-address"
inputRef={locationDisplayRef}
InputLabelProps={{ shrink: shrinkLabel }}
fullWidth
variant="standard"
label={DISPLAY_LOCATION}
helperText={error !== "" ? error : LOCATION_PUBLICLY_VISIBLE}
onFocus={() => setShrinkLabel(true)}
onBlur={() => !location.current.address && setShrinkLabel(false)}
/>
</div>
</>
);
}
interface RadiusSliderProps {
commit(updates: Partial<ApproximateLocation>, shouldUpdate?: boolean): void;
initialRadius: number;
redrawMap(): void;
}
function RadiusSlider({ commit, initialRadius, redrawMap }: RadiusSliderProps) {
const [radius, setRadius] = useState(initialRadius);
return (
<>
<Typography variant="body2" gutterBottom>
{LOCATION_WARN}
</Typography>
<Typography id="location-radius" gutterBottom>
{LOCATION_ACCURACY}
</Typography>
<Slider
aria-labelledby="location-radius"
aria-valuetext={getRadiusText(radius)}
value={radius}
step={5}
min={userLocationMinRadius}
max={userLocationMaxRadius}
onChange={(_, value) => {
setRadius(value as number);
commit({ radius: value as number }, false);
redrawMap();
}}
onChangeCommitted={(_, value) => {
commit({ radius: value as number });
redrawMap();
}}
/>
</>
);
}
function extractLngLat(loc: ApproximateLocation): LngLat {
return new LngLat(loc.lng, loc.lat);
}
function pointGeoJson(
coords: LngLat
): GeoJSON.FeatureCollection<GeoJSON.Geometry> {
return {
features: [
{
geometry: {
coordinates: coords.toArray(),
type: "Point",
},
properties: {},
type: "Feature",
},
],
type: "FeatureCollection",
};
}
function circleGeoJson(
coords: LngLat,
radius: number
): GeoJSON.FeatureCollection<GeoJSON.Geometry> {
return {
features: [
{
geometry: {
//create a circle of 60 points
coordinates: [
[
...Array(60)
.fill(0)
.map((_, index) => {
return displaceLngLat(
coords,
radius,
(index * 2 * Math.PI) / 60
).toArray();
}),
displaceLngLat(coords, radius, 0).toArray(),
],
],
type: "Polygon",
},
properties: {},
type: "Feature",
},
],
type: "FeatureCollection",
};
}
function displaceLngLat(coords: LngLat, distance: number, angle: number) {
// see https://gis.stackexchange.com/a/2964
// 111111 m ~ 1 degree
const lat = coords.lat + (1 / 111111) * distance * Math.cos(angle);
const lng =
coords.lng +
(1 / (111111 * Math.cos((coords.lat / 360) * 2 * Math.PI))) *
distance *
Math.sin(angle);
return new LngLat(lng, lat);
}
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