Allow focusing on a given course

src/front/map.js

@@ -83,17 +83,28 @@ const makeCourseColor = mainColor =>
     return hsl.hex();
 };
 
+const sizes = {
+    segmentOuter: 8,
+    segmentInner: 6,
+    stopRadius: 6,
+    stopBorder: 1.5,
+    courseSize: 15,
+    courseOuterBorder: 13,
+    courseBorder: 10,
+    courseInnerBorder: 7,
+};
+
 const segmentBorderStyle = feature => new Style({
     stroke: new Stroke({
         color: makeBorderColor(feature.get('colors')[0]),
-        width: 8,
+        width: sizes.segmentOuter,
     }),
 });
 
 const segmentInnerStyle = feature => new Style({
     stroke: new Stroke({
         color: feature.get('colors')[0],
-        width: 6,
+        width: sizes.segmentInner,
     }),
 });
 
@@ -104,9 +115,9 @@ const stopStyle = feature => new Style({
         }),
         stroke: new Stroke({
             color: makeBorderColor(feature.get('colors')[0]),
-            width: 1.5,
+            width: sizes.stopBorder,
         }),
-        radius: 6,
+        radius: sizes.stopRadius,
     }),
 });
 
@@ -118,11 +129,11 @@ const getCourseStyle = color =>
     {
         const icon = document.createElement('canvas');
 
-        const iconSize = 35;
-        const shapeSize = 15;
+        const shapeSize = sizes.courseSize;
+        const iconSize = sizes.courseSize + sizes.courseOuterBorder;
 
         icon.width = iconSize;
-        icon.height = iconSize * 0.6;
+        icon.height = iconSize;
 
         const cx = icon.width / 2;
         const cy = icon.height / 2;
@@ -130,9 +141,9 @@ const getCourseStyle = color =>
         const iconCtx = icon.getContext('2d');
 
         for (let [color, size] of [
-            [makeBorderColor(color), 13],
-            [color, 10],
-            [makeCourseColor(color), 7]
+            [makeBorderColor(color), sizes.courseOuterBorder],
+            [color, sizes.courseBorder],
+            [makeCourseColor(color), sizes.courseInnerBorder]
         ])
         {
             iconCtx.fillStyle = color;
@@ -223,9 +234,32 @@ const createMap = target =>
         view,
     });
 
-    // Run courses simulation and draw directly on the map
+    // Run courses simulation
     const simulInstance = simulation.start();
 
+    // Course on which the view is currently focused
+    let focusedCourse = null;
+    const focusZoom = 17;
+
+    const startFocus = courseId =>
+    {
+        if (courseId in simulInstance.courses)
+        {
+            const course = simulInstance.courses[courseId];
+            view.animate({
+                center: course.position,
+                zoom: focusZoom,
+                duration: 500,
+            }, () => focusedCourse = courseId);
+        }
+    };
+
+    const stopFocus = () =>
+    {
+        focusedCourse = null;
+    };
+
+    // Draw courses directly on the map
     map.on('postcompose', ev =>
     {
         simulInstance.update();
@@ -256,6 +290,12 @@ const createMap = target =>
 
                 const point = new Point(course.position);
                 ctx.drawGeometry(point);
+
+                if (course.id === focusedCourse)
+                {
+                    view.setCenter(course.position);
+                    // view.setZoom(focus);
+                }
             }
         }
 
@@ -263,6 +303,30 @@ const createMap = target =>
     });
 
     map.render();
+
+    map.on('singleclick', ev =>
+    {
+        const mousePixel = map.getPixelFromCoordinate(ev.coordinate);
+        const maxDistance = sizes.courseSize + sizes.courseOuterBorder;
+
+        for (let course of Object.values(simulInstance.courses))
+        {
+            const coursePixel = map.getPixelFromCoordinate(course.position);
+            const dx = mousePixel[0] - coursePixel[0];
+            const dy = mousePixel[1] - coursePixel[1];
+            const distance = dx * dx + dy * dy;
+
+            if (distance <= maxDistance * maxDistance)
+            {
+                startFocus(course.id);
+                return;
+            }
+        }
+
+        // Clicking anywhere else resets focus
+        stopFocus();
+    });
+
     return map;
 };