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Android MyOverlay extends Overlay

/ Published in: Java
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  1. private class MyOverlay extends Overlay {
  2. 		private GeoPoint center;
  3. 		private float radius;
  4. 		private Paint cPaint;
  5.  
  6. 		public MyOverlay(GeoPoint c) {
  7. 			center = c;
  8. 			radius = 20;
  9. 			cPaint = new Paint();
  10. 		}
  11.  
  12. 		@Override
  13. 		public void draw(Canvas canvas, MapView mapView, boolean shadow) {
  14. 			super.draw(canvas, mapView, shadow);
  15. 			if (shadow == false) {
  16. 				// class exercise
  17. 				// Step 1: get pixel coordinate of center (in GeoPoint)			
  18. 				Point screenPt = new Point();
  19. 				mapView.getProjection().toPixels(center, screenPt);
  20.  
  21. 				// Step 2: draw a circle at the converted pixel coordinate
  22. 				cPaint.setColor(Color.RED);
  23. 				cPaint.setAlpha(100);
  24. 				canvas.drawCircle(screenPt.x, screenPt.y, radius, cPaint);
  25. 			}		
  26.  
  27. 		}
  28. 	}

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