Move listener class outside of MainWindow.

src/main/org/insa/graphics/drawing/utils/PaintUtils.java

@@ -0,0 +1,35 @@
+package org.insa.graphics.drawing.utils;
+
+import java.awt.Color;
+
+import org.mapsforge.core.graphics.GraphicFactory;
+import org.mapsforge.map.awt.graphics.AwtGraphicFactory;
+
+public class PaintUtils {
+
+    // Graphic factory.
+    private static final GraphicFactory GRAPHIC_FACTORY = AwtGraphicFactory.INSTANCE;
+
+    /**
+     * @param color
+     * @return
+     */
+    public static int convertColor(Color color) {
+        return GRAPHIC_FACTORY.createColor(color.getAlpha(), color.getRed(), color.getGreen(), color.getBlue());
+    }
+
+    /**
+     * @param width
+     * @return
+     */
+    public static int getStrokeWidth(int width, byte zoomLevel) {
+        int mul = 2;
+        if (zoomLevel < 8) {
+            mul = 1;
+        }
+        else {
+            mul += 2 * (zoomLevel - 8) / 3;
+        }
+        return width * mul;
+    }
+}

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

@@ -0,0 +1,58 @@
+package org.insa.graphics.drawing.utils;
+
+import java.awt.Color;
+import java.util.ArrayList;
+
+import org.insa.graph.Point;
+import org.mapsforge.core.graphics.Canvas;
+import org.mapsforge.core.graphics.GraphicFactory;
+import org.mapsforge.core.model.BoundingBox;
+import org.mapsforge.core.model.LatLong;
+import org.mapsforge.map.awt.graphics.AwtGraphicFactory;
+import org.mapsforge.map.layer.overlay.Polyline;
+
+public class PolylineAutoScaling extends Polyline {
+
+    // Graphic factory.
+    private static final GraphicFactory GRAPHIC_FACTORY = AwtGraphicFactory.INSTANCE;
+
+    // Original width of the polyline.
+    private final int width;
+
+    /**
+     * @param width
+     * @param color
+     */
+    public PolylineAutoScaling(int width, Color color) {
+        super(GRAPHIC_FACTORY.createPaint(), GRAPHIC_FACTORY);
+        getPaintStroke().setColor(PaintUtils.convertColor(color));
+        this.width = width;
+    }
+
+    /**
+     * @param point
+     */
+    public void add(Point point) {
+        getLatLongs().add(new LatLong(point.getLatitude(), point.getLongitude()));
+    }
+
+    /**
+     * @param points
+     */
+    public void add(ArrayList<Point> points) {
+        for (Point point: points) {
+            add(point);
+        }
+    }
+
+    @Override
+    public synchronized void draw(BoundingBox boundingBox, byte zoomLevel, Canvas canvas,
+            org.mapsforge.core.model.Point topLeftPoint) {
+
+        // Update paint stroke with width for level
+        this.getPaintStroke().setStrokeWidth(PaintUtils.getStrokeWidth(width, zoomLevel));
+
+        super.draw(boundingBox, zoomLevel, canvas, topLeftPoint);
+    }
+
+}