Fix issue with path taking too long to be drawn due to useless syncrhonization.

src/main/org/insa/graphics/drawing/components/MapViewDrawing.java

@@ -414,9 +414,11 @@ public class MapViewDrawing extends MapView implements Drawing {
     @Override
     public PathOverlay drawPath(Path path, Color color, boolean markers) {
         PolylineAutoScaling line = new PolylineAutoScaling(1, DEFAULT_PATH_COLOR);
+        ArrayList<Point> points = new ArrayList<>(path.getArcs().size() * 4);
         for (Arc arc: path.getArcs()) {
-            line.add(arc.getPoints());
+            points.addAll(arc.getPoints());
         }
+        line.addAll(points);
         PathOverlay overlay = null;
         if (markers) {
             MarkerAutoScaling origin = createMarker(path.getOrigin().getPoint(),

src/main/org/insa/graphics/drawing/overlays/PolylineAutoScaling.java

@@ -1,7 +1,8 @@
 package org.insa.graphics.drawing.overlays;
 
 import java.awt.Color;
-import java.util.List;
+import java.util.ArrayList;
+import java.util.Collection;
 
 import org.insa.graph.Point;
 import org.mapsforge.core.graphics.Canvas;
@@ -70,10 +71,12 @@ public class PolylineAutoScaling extends Polyline {
     /**
      * @param points Points to add to this line.
      */
-    public void add(List<Point> points) {
+    public void addAll(Collection<? extends Point> points) {
+        ArrayList<LatLong> latlongs = new ArrayList<>(points.size());
         for (Point point: points) {
-            add(point);
+            latlongs.add(new LatLong(point.getLatitude(), point.getLongitude()));
         }
+        getLatLongs().addAll(latlongs);
     }
 
     @Override