BubbleOverlay.java :  » App » imogene-map » org » imogene » map » provider » osm » overlay » Android Open Source

package org.imogene.map.provider.osm.overlay;

import org.imogene.map.provider.osm.R;
import org.osmdroid.util.GeoPoint;
import org.osmdroid.views.MapView;
import org.osmdroid.views.overlay.Overlay;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Point;
import android.graphics.RectF;
import android.view.View;

public class BubbleOverlay extends Overlay {

  private final Bitmap bubbleIcon;
  private final Bitmap shadowIcon;
  
  private final Point reuse = new Point();
  
  private View mParent;

  private GeoPoint mGeoPoint;
  
  public BubbleOverlay(Context context, GeoPoint point) {
    super(context);
    mGeoPoint = point;

    bubbleIcon = BitmapFactory.decodeResource(context.getResources(), R.drawable.bubble);
    shadowIcon = BitmapFactory.decodeResource(context.getResources(), R.drawable.shadow);
  }
  
  public GeoPoint getGeoPoint() {
    return mGeoPoint;
  }
  
  public void setGeoPoint(GeoPoint point) {
    mGeoPoint = point;
    refreshOverlay();
  }
  
  public void refreshOverlay() {
    if (mParent != null) {
      mParent.postInvalidate();
    }
  }
  
  void assignParent(View parent) {
    if (mParent != parent) {
      mParent = parent;
    }
  }

  @Override
  protected void draw(Canvas canvas, MapView mapView, boolean shadow) {
    assignParent(mapView);
       drawMapLocations(canvas, mapView);
  }

    private void drawMapLocations(Canvas canvas, MapView mapView) {
    mapView.getProjection().toMapPixels(mGeoPoint, reuse);
    
    canvas.drawBitmap(bubbleIcon, reuse.x - bubbleIcon.getWidth()/2 , reuse.y - bubbleIcon.getHeight(),null);
      canvas.drawBitmap(shadowIcon, reuse.x - 1, reuse.y - shadowIcon.getHeight(),null);
    }
    
  protected final boolean overlayIsSelected(int x, int y) {
    // Track which MapLocation was hit...if any
    RectF hitTestRecr = new RectF();

    // Create a 'hit' testing Rectangle w/size and coordinates of our icon
    // Set the 'hit' testing Rectangle with the size and coordinates of our on screen icon
    hitTestRecr.set(-bubbleIcon.getWidth() / 2,  -bubbleIcon.getHeight(), bubbleIcon.getWidth() / 2, 0);
    hitTestRecr.offset(reuse.x, reuse.y);

    // Finally test for a match between our 'hit' Rectangle and the
    // location clicked by the user
    return hitTestRecr.contains(x, y);
  }
  
  protected Point getMarkerPoint() {
    return reuse;
  }
  
}