-
Notifications
You must be signed in to change notification settings - Fork 329
/
SvgMap.tsx
293 lines (257 loc) · 8.71 KB
/
SvgMap.tsx
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
import { geoMercator, GeoProjection } from 'd3-geo';
import rbush from 'rbush';
import React, { useCallback, useEffect, useMemo, useRef } from 'react';
import { ComposableMap, Geographies, Geography, Marker } from 'react-simple-maps';
import geographyData from '../../../assets/geo/geometry.json';
import statesProvincesLinesData from '../../../assets/geo/states-provinces-lines.json';
import geometryTreeData from '../../../assets/geo/geometry.rbush.json';
import statesProvincesLinesTreeData from '../../../assets/geo/states-provinces-lines.rbush.json';
interface IGeometryLeaf extends rbush.BBox {
id: string;
}
interface IProvinceAndStateLineLeaf extends rbush.BBox {
id: string;
}
const geometryTree = rbush<IGeometryLeaf>().fromJSON(geometryTreeData);
const provincesStatesLinesTree = rbush<IProvinceAndStateLineLeaf>().fromJSON(
statesProvincesLinesTreeData,
);
type BBox = [number, number, number, number];
const MOVE_SPEED = 2000;
const mapStyle = {
width: '100%',
height: '100%',
backgroundColor: '#192e45',
};
const zoomableGroupStyle = {
transition: `transform ${MOVE_SPEED}ms ease-out`,
};
function getMarkerImageStyle(zoom: number) {
return {
width: '60px',
transform: `translate(${-30 / zoom}px, ${-30 / zoom}px) scale(${1 / zoom})`,
transition: `transform ${MOVE_SPEED}ms ease-out`,
};
}
const geographyStyle = mergeRsmStyle({
default: {
fill: '#294d73',
stroke: '#192e45',
strokeWidth: 0.2,
},
});
const stateProvinceLineStyle = mergeRsmStyle({
default: {
fill: 'transparent',
stroke: '#192e45',
strokeWidth: 0.2,
},
});
const projectionConfig = {
scale: 160,
};
function mergeRsmStyle(style: {
default?: React.CSSProperties;
hover?: React.CSSProperties;
pressed?: React.CSSProperties;
}) {
const defaultStyle = style.default || {};
return {
default: defaultStyle,
hover: style.hover || defaultStyle,
pressed: style.pressed || defaultStyle,
};
}
function getProjection(width: number, height: number, offset: [number, number], scale: number) {
return geoMercator()
.scale(scale)
.translate([offset[0] + width / 2, offset[1] + height / 2])
.precision(0.1);
}
function getZoomCenter(
center: [number, number],
offset: [number, number],
projection: GeoProjection,
zoom: number,
): [number, number] {
const pos = projection(center)!;
return projection.invert!([pos[0] + offset[0] / zoom, pos[1] + offset[1] / zoom])!;
}
function getViewportGeoBoundingBox(
centerCoordinate: [number, number],
width: number,
height: number,
projection: GeoProjection,
zoom: number,
): BBox {
const center = projection(centerCoordinate)!;
const halfWidth = (width * 0.5) / zoom;
const halfHeight = (height * 0.5) / zoom;
const northWest = projection.invert!([center[0] - halfWidth, center[1] - halfHeight])!;
const southEast = projection.invert!([center[0] + halfWidth, center[1] + halfHeight])!;
// normalize to [minX, minY, maxX, maxY]
return [
Math.min(northWest[0], southEast[0]),
Math.min(northWest[1], southEast[1]),
Math.max(northWest[0], southEast[0]),
Math.max(northWest[1], southEast[1]),
];
}
function getCombindedViewportBboxMatch(viewportBboxes: BBox[]) {
return {
minX: Math.min(...viewportBboxes.map((viewportBbox) => viewportBbox[0])),
minY: Math.min(...viewportBboxes.map((viewportBbox) => viewportBbox[1])),
maxX: Math.max(...viewportBboxes.map((viewportBbox) => viewportBbox[2])),
maxY: Math.max(...viewportBboxes.map((viewportBbox) => viewportBbox[3])),
};
}
function sameProps(prevProps: IProps, nextProps: IProps) {
return (
prevProps.width === nextProps.width &&
prevProps.height === nextProps.height &&
prevProps.center[0] === nextProps.center[0] &&
prevProps.center[1] === nextProps.center[1] &&
prevProps.offset[0] === nextProps.offset[0] &&
prevProps.offset[1] === nextProps.offset[1] &&
prevProps.zoomLevel === nextProps.zoomLevel &&
prevProps.showMarker === nextProps.showMarker &&
prevProps.markerImagePath === nextProps.markerImagePath
);
}
function useViewportBboxes(
center: [number, number],
width: number,
height: number,
projection: GeoProjection,
zoom: number,
): [BBox[], () => void] {
const viewportBbox = useMemo(
() => getViewportGeoBoundingBox(center, width, height, projection, zoom),
[center, width, height, projection, zoom],
);
const prev = useRef<BBox[]>([]);
const viewportBboxes = useMemo(() => [...prev.current, viewportBbox], [viewportBbox]);
const keepLast = useCallback(() => {
prev.current = prev.current.slice(-1);
}, []);
useEffect(() => {
prev.current = [...viewportBboxes];
}, [viewportBboxes]);
return [viewportBboxes, keepLast];
}
function useVisibleGeometry(viewportBboxes: BBox[]) {
const combinedViewportBboxMatch = useMemo(() => getCombindedViewportBboxMatch(viewportBboxes), [
viewportBboxes,
]);
const visibleGeometry = useMemo(() => geometryTree.search(combinedViewportBboxMatch), [
combinedViewportBboxMatch,
]);
const visibleStatesProvincesLines = useMemo(
() => provincesStatesLinesTree.search(combinedViewportBboxMatch),
[combinedViewportBboxMatch],
);
return [visibleGeometry, visibleStatesProvincesLines];
}
export interface IProps {
width: number;
height: number;
center: [number, number]; // longitude, latitude
offset: [number, number]; // [x, y] in points
zoomLevel: number;
showMarker: boolean;
markerImagePath: string;
}
// @TODO: Calculate zoom level based on (center + span) (aka MKCoordinateSpan)
function SvgMap(props: IProps) {
const { width, height, zoomLevel } = props;
const center = useMemo(() => props.center, [...props.center]);
const projection = useMemo(
() => getProjection(width, height, props.offset, projectionConfig.scale),
[width, height, ...props.offset, projectionConfig.scale],
);
const zoomCenter = useMemo(() => getZoomCenter(center, props.offset, projection, zoomLevel), [
...center,
...props.offset,
projection,
zoomLevel,
]);
const [viewportBboxes, removeOldViewportBboxes] = useViewportBboxes(
zoomCenter,
width,
height,
projection,
zoomLevel,
);
const [visibleGeometry, visibleStatesProvincesLines] = useVisibleGeometry(viewportBboxes);
const markerStyle = useMemo(
() => mergeRsmStyle({ default: { display: props.showMarker ? undefined : 'none' } }),
[props.showMarker],
);
const markerImageStyle = useMemo(() => getMarkerImageStyle(zoomLevel), [zoomLevel]);
return (
<ComposableMap
width={width}
height={height}
style={mapStyle}
projection={
// Workaround for incorrect type definition in @types/react-simple-maps.
/* @ts-ignore */
projection as () => GeoProjection
}
projectionConfig={projectionConfig}>
<ZoomableGroup
center={zoomCenter}
zoom={zoomLevel}
onTransitionEnd={removeOldViewportBboxes}
style={zoomableGroupStyle}
width={width}
height={height}
projection={projection}>
<Geographies geography={geographyData}>
{({ geographies }) => {
return visibleGeometry.map(({ id }) => (
<Geography
key={id}
geography={geographies[parseInt(id, 10)]}
style={geographyStyle}
/>
));
}}
</Geographies>
<Geographies geography={statesProvincesLinesData}>
{({ geographies }) => {
return visibleStatesProvincesLines.map(({ id }) => (
<Geography
key={id}
geography={geographies[parseInt(id, 10)]}
style={stateProvinceLineStyle}
/>
));
}}
</Geographies>
<Marker coordinates={center} style={markerStyle}>
<image style={markerImageStyle} xlinkHref={props.markerImagePath} />
</Marker>
</ZoomableGroup>
</ComposableMap>
);
}
export default React.memo(SvgMap, sameProps);
// Workaround for issue where react-simple-maps does an animated zoom/pan when first loading the
// map. When this issue is resolved it can be removed:
// https://github.com/zcreativelabs/react-simple-maps/issues/228
interface IZoomableGroupProps extends React.SVGAttributes<SVGGElement> {
center: [number, number];
zoom: number;
width: number;
height: number;
projection: GeoProjection;
}
function ZoomableGroup(props: IZoomableGroupProps) {
const { height, width, center, zoom, projection, ...otherProps } = props;
const transform = useMemo(() => {
const [x, y] = projection(center) ?? [0, 0];
return `translate(${width / 2 - x * zoom} ${height / 2 - y * zoom}) scale(${zoom})`;
}, [projection, center, width, height, zoom]);
return <g transform={transform} {...otherProps} />;
}