Starting to implement avatars for locations (WIP).

src/components/map/AvatarForLocation.tsx

@@ -0,0 +1,49 @@
+import React from 'react';
+
+import { useSelector } from 'react-redux';
+import { geoPoint, lat2tile, lon2tile, Point } from '../../lib/geo';
+
+import { MapState } from '../../store/map';
+import { tileProviders } from './tile';
+
+interface AvatarForLocationProps {
+  location: geoPoint;
+  zoom?: number;
+  tileProvider?: string;
+  size?: number;
+  name?: string;
+}
+
+const AvatarForLocation: React.FC<AvatarForLocationProps> = (
+  props: AvatarForLocationProps
+) => {
+  const size = props.size ? props.size : 42;
+  const zoom = props.zoom ? Math.round(props.zoom) : 16;
+  const tileProvider = props.tileProvider ? props.tileProvider : 'osm';
+  const location = props.location;
+  const name = props.name ? props.name : '???';
+
+  const tilesLocation: Point = {
+    x: lon2tile(location.lon, zoom),
+    y: lat2tile(location.lat, zoom),
+  };
+
+
+  return (
+    <svg width={size} height={size}>
+      <defs>
+        <clipPath id='cut-off'>
+          <circle cx={size / 2} cy={size / 2} r={size / 2} />
+        </clipPath>
+      </defs>
+      <g clip-path='url(#cut-off)'>
+        <image href={tileProviders[tileProvider].getTileUrl(zoom, Math.floor(tilesLocation.x), Math.floor(tilesLocation.y))} />
+        <text x='2' y={size / 2 + 5}>
+          {name}
+        </text>
+      </g>
+    </svg>
+  );
+};
+
+export default AvatarForLocation;

src/components/map/LocationInfo.tsx

@@ -32,6 +32,8 @@ import { useSelector } from 'react-redux';
 import i18n from '../../i18n';
 import { geoPoint } from '../../lib/geo';
 import { MapState } from '../../store/map';
+import AvatarForLocation from './AvatarForLocation';
+import { round } from 'lodash';
 
 const LocationInfo: React.FC<{}> = () => {
   const scope = useSelector((state: { map: MapState }) => state.map.scope);
@@ -134,17 +136,15 @@ const LocationInfo: React.FC<{}> = () => {
     const distDark = (255 * distance) / 3000;
     const distLight = 1 - distDark;
     return (
-      <Avatar
-        src={AvatarInitial.initialAvatar({
-          size: 100,
-          initials: Math.round(distance),
-          initial_fg: `rgb(${distLight},0,${distLight}`,
-          initial_bg: `rgb(0,${distDark},  0`,
-          initial_size: 33, // Defaults to height / 2
-          initial_weight: 1000,
-          initial_font_family: "'Lato', 'Lato-Regular', 'Helvetica Neue'",
-        })}
-      />
+      <Avatar>
+        <AvatarForLocation
+          location={{
+            lon: props.feature.geometry.coordinates[0],
+            lat: props.feature.geometry.coordinates[1],
+          }}
+          name={Math.round(distance).toString()}
+        />
+      </Avatar>
     );
   };
 

src/components/map/Reticle.tsx

@@ -15,6 +15,18 @@ import {
 import i18n from '../../i18n';
 import eventBus from '../../lib/pubsub';
 
+export const getSTile = (lat: number, zoom: number) => {
+  /**
+   * The horizontal distance represented by each square tile, measured along the parallel at a given latitude, is given by:
+   *     Stile = C ∙ cos(latitude) / 2 zoomlevel
+   * As tiles are 256-pixels wide, the horizontal distance represented by one pixel is:
+   *     Spixel = Stile / 256 = C ∙ cos(latitude) / 2 (zoomlevel + 8)
+   * where C means the equatorial circumference of the Earth (40 075 016.686 m ≈ 2π ∙ 6 378 137.000 m for the reference geoid used by OpenStreetMap).
+   *     see https://wiki.openstreetmap.org/wiki/Zoom_levels
+   */
+  return (40075016.686 * Math.cos((lat * Math.PI) / 180)) / 2 ** zoom;
+};
+
 const Reticle: React.FC<{}> = () => {
   const windowState = useSelector(
     (state: { map: MapState }) => state.map.window
@@ -26,18 +38,7 @@ const Reticle: React.FC<{}> = () => {
     y: windowState.height / 2,
   };
 
-  /**
-   * The horizontal distance represented by each square tile, measured along the parallel at a given latitude, is given by:
-   *     Stile = C ∙ cos(latitude) / 2 zoomlevel
-   * As tiles are 256-pixels wide, the horizontal distance represented by one pixel is:
-   *     Spixel = Stile / 256 = C ∙ cos(latitude) / 2 (zoomlevel + 8)
-   * where C means the equatorial circumference of the Earth (40 075 016.686 m ≈ 2π ∙ 6 378 137.000 m for the reference geoid used by OpenStreetMap).
-   *     see https://wiki.openstreetmap.org/wiki/Zoom_levels
-   */
-
-  const sTile =
-    (40075016.686 * Math.cos((scope.center.lat * Math.PI) / 180)) /
-    2 ** scope.zoom;
+  const sTile = getSTile(scope.center.lat, scope.zoom);
 
   const radiusMeters = (sTile * radius) / 256;
   const radiusOrder = Math.floor(Math.log10(radiusMeters));