Improve icon for courses

src/front/map.js

@@ -16,7 +16,7 @@ const LineString = require('ol/geom/LineString').default;
 
 const proj = require('ol/proj');
 
-const {Style, Fill, Stroke, Circle} = require('ol/style');
+const {Style, Fill, Stroke, Circle, Icon} = require('ol/style');
 const color = require('color');
 
 const mapboxToken = `pk.eyJ1IjoibWF0dGVvZGVsYWJyZSIsImEiOiJja2NxaTUyMmUwcmFhMn\
@@ -76,6 +76,13 @@ const makeBorderColor = mainColor =>
     return hsl.hex();
 };
 
+const makeCourseColor = mainColor =>
+{
+    const hsl = color(mainColor).hsl();
+    hsl.color = Math.max(0, hsl.color[2] += 10);
+    return hsl.hex();
+};
+
 const segmentBorderStyle = feature => new Style({
     stroke: new Stroke({
         color: makeBorderColor(feature.get('colors')[0]),
@@ -103,18 +110,56 @@ const stopStyle = feature => new Style({
     }),
 });
 
-const courseStyle = new Style({
-    image: new Circle({
-        fill: new Fill({
-            color: '#FF0000',
-        }),
-        stroke: new Stroke({
-            color: makeBorderColor('#FF0000'),
-            width: 1.5,
-        }),
-        radius: 6,
+const courseStyles = {};
+
+const getCourseStyle = color =>
+{
+    if (!(color in courseStyles))
+    {
+        const icon = document.createElement('canvas');
+
+        const iconSize = 35;
+        const shapeSize = 15;
+
+        icon.width = iconSize;
+        icon.height = iconSize * 0.6;
+
+        const cx = icon.width / 2;
+        const cy = icon.height / 2;
+
+        const iconCtx = icon.getContext('2d');
+
+        for (let [color, size] of [
+            [makeBorderColor(color), 13],
+            [color, 10],
+            [makeCourseColor(color), 7]
+        ])
+        {
+            iconCtx.fillStyle = color;
+            iconCtx.strokeStyle = color;
+            iconCtx.lineWidth = size;
+            iconCtx.lineJoin = 'round';
+            iconCtx.miterLimit = 200000;
+
+            iconCtx.beginPath();
+            iconCtx.moveTo(cx - 0.5 * shapeSize, cy - 0.3 * shapeSize);
+            iconCtx.lineTo(cx + 0.5 * shapeSize, cy);
+            iconCtx.lineTo(cx - 0.5 * shapeSize, cy + 0.3 * shapeSize);
+            iconCtx.closePath();
+            iconCtx.stroke();
+            iconCtx.fill();
+        }
+
+        courseStyles[color] = new Style({
+            image: new Icon({
+                img: icon,
+                imgSize: [icon.width, icon.height],
             }),
         });
+    }
+
+    return courseStyles[color];
+};
 
 const createMap = target =>
 {
@@ -162,7 +207,7 @@ const createMap = target =>
     // Setup map
     const view = new View({
         center: proj.fromLonLat([3.88, 43.605]),
-        zoom: 13,
+        zoom: 14,
         maxZoom: 22,
         constrainResolution: true,
     });
@@ -199,10 +244,17 @@ const createMap = target =>
                 = stopsLayer.renderer_.inversePixelTransform;
 
             const ctx = getVectorContext(ev);
-            ctx.setStyle(courseStyle);
+            let rotation = 0;
 
             for (let course of Object.values(simulInstance.courses))
             {
+                const color = network.lines[course.line].color;
+                const style = getCourseStyle(color);
+
+                style.getImage().setRotation(rotation * Math.PI / 16);
+                rotation += 1;
+                ctx.setStyle(style);
+
                 const point = new Point(course.position);
                 ctx.drawGeometry(point);
             }