Added default zoom behaviour on double tap

@@ -439,6 +439,7 @@
 -(void) setScale: (float) scale
 {
 	[mercatorToScreenProjection setScale:scale];
+	[overlay correctPositionOfAllSublayers];
 	[tileLoader updateLoadedImages];
 	[renderer setNeedsDisplay];
 }
@@ -447,9 +448,12 @@
 {
 	return [mercatorToTileProjection calculateZoomFromScale:[mercatorToScreenProjection scale]];
 }
+
 -(void) setZoom: (float) zoom
 {
-	float scale = [mercatorToTileProjection calculateScaleFromZoom:zoom];
+	//limit the zoom to maxZoom and minZoom as specified by projection - why do we also store maxZoom?
+	float normalisedZoom = [mercatorToTileProjection normaliseZoom:zoom];		
+	float scale = [mercatorToTileProjection calculateScaleFromZoom:normalisedZoom];
 	[self setScale:scale];	
 }
 

@@ -57,6 +57,7 @@ typedef struct {
 - (void)zoomByFactor: (float) zoomFactor near:(CGPoint) aPoint;
 - (CGPoint)latLongToPixel:(CLLocationCoordinate2D)latlong;
 - (CLLocationCoordinate2D)pixelToLatLong:(CGPoint)aPixel;
+- (void)zoomInToNextNativeZoom;
 - (void)setZoom:(int)zoomInt;
 - (void)zoomWithLatLngBoundsNorthEast:(CLLocationCoordinate2D)ne SouthWest:(CLLocationCoordinate2D)se;
 - (void)setZoomBounds:(float)aMinZoom maxZoom:(float)aMaxZoom;

@@ -305,10 +305,11 @@
 		if (delegateHasDoubleTapOnMap) {
 			[delegate doubleTapOnMap: self At: lastGesture.center];
 		} else {
-			// TODO: default behaviour
-			// [contents zoomInToNextNativeZoom];
+			// Default behaviour matches built in maps.app
+			[self zoomInToNextNativeZoom];
 		}
 	}
+	
 		
 	if (touch.tapCount == 1) 
 	{
@@ -364,6 +365,20 @@
 	return [contents pixelToLatLong:pixel];
 }
 
+
+
+#pragma mark Auto Zoom
+
+
+- (void)zoomInToNextNativeZoom
+{
+	
+	// Calculate rounded zoom
+	float newZoom = roundf([contents zoom] + 1);
+	[contents setZoom:newZoom];// Contents limits zooms which are too high
+}
+
+
 #pragma mark Manual Zoom
 - (void)setZoom:(int)zoomInt
 {