Merge pull request #1243 from jcardus/speed-based-color

draw route with speed based color

src/common/util/colors.js

@@ -0,0 +1,23 @@
+import { decomposeColor } from '@mui/material';
+
+export const interpolateColor = (color1, color2, factor) => {
+  if (factor > 1) factor = 1;
+  if (factor < 0) factor = 0;
+
+  const c1 = decomposeColor(color1).values;
+  const c2 = decomposeColor(color2).values;
+
+  const r = Math.round(c1[0] + factor * (c2[0] - c1[0]));
+  const g = Math.round(c1[1] + factor * (c2[1] - c1[1]));
+  const b = Math.round(c1[2] + factor * (c2[2] - c1[2]));
+
+  return `rgb(${r}, ${g}, ${b})`;
+};
+
+export const getSpeedColor = (color1, color2, color3, speed, max) => {
+  const factor = speed / max;
+  if (factor <= 0.5) {
+    return interpolateColor(color1, color2, factor * 2);
+  }
+  return interpolateColor(color2, color3, (factor - 0.5) * 2);
+};

src/map/MapRoutePath.js

@@ -2,6 +2,7 @@ import { useTheme } from '@mui/styles';
 import { useId, useEffect } from 'react';
 import { useSelector } from 'react-redux';
 import { map } from './core/MapView';
+import { getSpeedColor } from '../common/util/colors';
 
 const MapRoutePath = ({ name, positions, coordinates }) => {
   const id = useId();
@@ -79,16 +80,26 @@ const MapRoutePath = ({ name, positions, coordinates }) => {
     if (!coordinates) {
       coordinates = positions.map((item) => [item.longitude, item.latitude]);
     }
+    const maxSpeed = positions.map((p) => p.speed).reduce((a, b) => Math.max(a, b), -Infinity);
+    const features = [];
+    for (let i = 0; i < positions.length - 1; i += 1) {
+      const p1 = positions[i];
+      const p2 = positions[i + 1];
+      features.push({
+        type: 'Feature',
+        geometry: {
+          type: 'LineString',
+          coordinates: [[p1.longitude, p1.latitude], [p2.longitude, p2.latitude]],
+        },
+        properties: {
+          color: getSpeedColor(theme.palette.success.main, theme.palette.warning.main, theme.palette.error.main, p1.speed, maxSpeed),
+        },
+      });
+    }
+
     map.getSource(id)?.setData({
-      type: 'Feature',
-      geometry: {
-        type: 'LineString',
-        coordinates,
-      },
-      properties: {
-        name,
-        color: reportColor,
-      },
+      type: 'FeatureCollection',
+      features,
     });
   }, [theme, positions, coordinates, reportColor]);
 

src/map/MapRoutePoints.js

@@ -1,8 +1,11 @@
 import { useId, useCallback, useEffect } from 'react';
+import { useTheme } from '@mui/styles';
 import { map } from './core/MapView';
+import { getSpeedColor } from '../common/util/colors';
 
 const MapRoutePoints = ({ positions, onClick }) => {
   const id = useId();
+  const theme = useTheme();
 
   const onMouseEnter = () => map.getCanvas().style.cursor = 'pointer';
   const onMouseLeave = () => map.getCanvas().style.cursor = '';
@@ -27,11 +30,13 @@ const MapRoutePoints = ({ positions, onClick }) => {
       id,
       type: 'symbol',
       source: id,
+      paint: {
+        'text-color': ['get', 'color'],
+      },
       layout: {
-        'icon-image': 'arrow',
-        'icon-allow-overlap': true,
-        'icon-rotate': ['get', 'rotation'],
-        'icon-rotation-alignment': 'map',
+        'text-field': '▲',
+        'text-allow-overlap': true,
+        'text-rotate': ['get', 'rotation'],
       },
     });
 
@@ -54,6 +59,7 @@ const MapRoutePoints = ({ positions, onClick }) => {
   }, [onMarkerClick]);
 
   useEffect(() => {
+    const maxSpeed = positions.map((p) => p.speed).reduce((a, b) => Math.max(a, b), -Infinity);
     map.getSource(id)?.setData({
       type: 'FeatureCollection',
       features: positions.map((position, index) => ({
@@ -66,6 +72,7 @@ const MapRoutePoints = ({ positions, onClick }) => {
           index,
           id: position.id,
           rotation: position.course,
+          color: getSpeedColor(theme.palette.success.main, theme.palette.warning.main, theme.palette.error.main, position.speed, maxSpeed),
         },
       })),
     });

src/map/core/preloadImages.js

@@ -2,7 +2,6 @@ import { grey } from '@mui/material/colors';
 import createPalette from '@mui/material/styles/createPalette';
 import { loadImage, prepareIcon } from './mapUtil';
 
-import arrowSvg from '../../resources/images/arrow.svg';
 import directionSvg from '../../resources/images/direction.svg';
 import backgroundSvg from '../../resources/images/background.svg';
 import animalSvg from '../../resources/images/icon/animal.svg';
@@ -65,7 +64,6 @@ export default async () => {
   const background = await loadImage(backgroundSvg);
   mapImages.background = await prepareIcon(background);
   mapImages.direction = await prepareIcon(await loadImage(directionSvg));
-  mapImages.arrow = await prepareIcon(await loadImage(arrowSvg));
   await Promise.all(Object.keys(mapIcons).map(async (category) => {
     const results = [];
     ['info', 'success', 'error', 'neutral'].forEach((color) => {