//
//  RMMapView.m
//
// Copyright (c) 2008-2009, Route-Me Contributors
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// * Redistributions of source code must retain the above copyright notice, this
//   list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright notice,
//   this list of conditions and the following disclaimer in the documentation
//   and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.

#import "RMMapView.h"
#import "RMMapContents.h"
#import "RMMapViewDelegate.h"

#import "RMTileLoader.h"

#import "RMMercatorToScreenProjection.h"
#import "RMMarker.h"
#import "RMProjection.h"
#import "RMMarkerManager.h"

@interface RMMapView (PrivateMethods)
// methods for post-touch deceleration, ala UIScrollView
- (void)startDecelerationWithDelta:(CGSize)delta;
- (void)incrementDeceleration:(NSTimer *)timer;
- (void)stopDeceleration;
@end

@implementation RMMapView

@synthesize decelerationFactor;
@synthesize deceleration;

@synthesize rotation;

@synthesize enableDragging;
@synthesize enableZoom;
@synthesize enableRotate;

#pragma mark --- begin constants ----
#define kDefaultDecelerationFactor .88f
#define kMinDecelerationDelta 0.01f
#pragma mark --- end constants ----

- (RMMarkerManager *)markerManager
{
  return contents.markerManager;
}

- (void)performInitialSetup
{
	LogMethod();

	enableDragging = YES;
	enableZoom = YES;
	enableRotate = NO;
	decelerationFactor = kDefaultDecelerationFactor;
	deceleration = NO;

	//	[self recalculateImageSet];

	if (enableZoom || enableRotate)
		[self setMultipleTouchEnabled:TRUE];

	self.backgroundColor = [UIColor grayColor];

	_constrainMovement = NO;
}

- (id)initWithFrame:(CGRect)frame
{
	LogMethod();
	if (!(self = [super initWithFrame:frame]))
        return nil;

    contents = nil;
    [self performInitialSetup];

	return self;
}

//=========================================================== 
//  contents 
//=========================================================== 

- (RMMapContents *)contents
{
    if (!_contentsIsSet) {
		contents = [[RMMapContents alloc] initWithView:self];
		_contentsIsSet = YES;
	}
	return contents; 
}

- (void)setContents:(RMMapContents *)theContents
{
    if (contents != theContents) {
        [contents autorelease];
        contents = [theContents retain];
		_contentsIsSet = YES;
		[self performInitialSetup];
    }
}

- (void)dealloc
{
	LogMethod();
    [self setDelegate:nil];
    [self stopDeceleration];
	[contents release]; contents = nil;
	[super dealloc];
}

- (void)drawRect:(CGRect)rect
{
	[contents drawRect:rect];
}

- (NSString *)description
{
	CGRect bounds = [self bounds];
	return [NSString stringWithFormat:@"MapView at %.0f,%.0f-%.0f,%.0f", bounds.origin.x, bounds.origin.y, bounds.size.width, bounds.size.height];
}

// Forward invocations to RMMapContents
- (void)forwardInvocation:(NSInvocation *)invocation
{
    SEL aSelector = [invocation selector];

    if ([contents respondsToSelector:aSelector])
        [invocation invokeWithTarget:contents];
    else
        [self doesNotRecognizeSelector:aSelector];
}

- (NSMethodSignature *)methodSignatureForSelector:(SEL)aSelector
{
	if ([super respondsToSelector:aSelector])
		return [super methodSignatureForSelector:aSelector];
	else
		return [contents methodSignatureForSelector:aSelector];
}

#pragma mark Delegate 

@dynamic delegate;

- (void)setDelegate:(id <RMMapViewDelegate>)_delegate
{
	if (delegate == _delegate)
        return;

	delegate = _delegate;

	_delegateHasBeforeMapMove = [(NSObject *)delegate respondsToSelector:@selector(beforeMapMove:)];
	_delegateHasAfterMapMove  = [(NSObject *)delegate respondsToSelector:@selector(afterMapMove:)];
	_delegateHasAfterMapMoveDeceleration = [(NSObject *)delegate respondsToSelector:@selector(afterMapMoveDeceleration:)];

	_delegateHasBeforeMapZoomByFactor = [(NSObject *)delegate respondsToSelector:@selector(beforeMapZoom:byFactor:near:)];
	_delegateHasAfterMapZoomByFactor  = [(NSObject *)delegate respondsToSelector:@selector(afterMapZoom:byFactor:near:)];

	_delegateHasBeforeMapRotate  = [(NSObject *)delegate respondsToSelector:@selector(beforeMapRotate:fromAngle:)];
	_delegateHasAfterMapRotate  = [(NSObject *)delegate respondsToSelector:@selector(afterMapRotate:toAngle:)];

	_delegateHasDoubleTapOnMap = [(NSObject *)delegate respondsToSelector:@selector(doubleTapOnMap:at:)];
    _delegateHasDoubleTapTwoFingersOnMap = [(NSObject *)delegate respondsToSelector:@selector(doubleTapTwoFingersOnMap:at:)];
	_delegateHasSingleTapOnMap = [(NSObject *)delegate respondsToSelector:@selector(singleTapOnMap:at:)];
	_delegateHasLongSingleTapOnMap = [(NSObject *)delegate respondsToSelector:@selector(longSingleTapOnMap:at:)];

	_delegateHasTapOnMarker = [(NSObject *)delegate respondsToSelector:@selector(tapOnMarker:onMap:)];
	_delegateHasTapOnLabelForMarker = [(NSObject *)delegate respondsToSelector:@selector(tapOnLabelForMarker:onMap:)];

	_delegateHasAfterMapTouch  = [(NSObject *)delegate respondsToSelector:@selector(afterMapTouch:)];

   	_delegateHasShouldDragMarker = [(NSObject *)delegate respondsToSelector:@selector(mapView:shouldDragMarker:withEvent:)];
   	_delegateHasDidDragMarker = [(NSObject *)delegate respondsToSelector:@selector(mapView:didDragMarker:withEvent:)];
}

- (id <RMMapViewDelegate>)delegate
{
	return delegate;
}

#pragma mark Movement

- (void)moveToProjectedPoint:(RMProjectedPoint)aPoint
{
	if (_delegateHasBeforeMapMove) [delegate beforeMapMove:self];
	[contents moveToProjectedPoint:aPoint];
	if (_delegateHasAfterMapMove) [delegate afterMapMove:self];
}

- (void)moveToLatLong:(CLLocationCoordinate2D)point
{
	if (_delegateHasBeforeMapMove) [delegate beforeMapMove:self];
	[contents moveToLatLong:point];
	if (_delegateHasAfterMapMove) [delegate afterMapMove:self];
}

- (void)setConstraintsSW:(CLLocationCoordinate2D)sw NE:(CLLocationCoordinate2D)ne
{
	RMProjection *proj = self.contents.projection;

	NEconstraint = [proj coordinateToProjectedPoint:ne];
	SWconstraint = [proj coordinateToProjectedPoint:sw];

	_constrainMovement=YES;
}

- (void)moveBy:(CGSize)delta 
{
	if (_constrainMovement) 
	{
		RMMercatorToScreenProjection *mtsp = self.contents.mercatorToScreenProjection;

		//calculate new bounds after move
		RMProjectedRect pBounds=[mtsp projectedBounds];
		RMProjectedSize XYDelta = [mtsp projectScreenSizeToProjectedSize:delta];
        CGSize sizeRatio = CGSizeMake(((delta.width == 0) ? 0 : XYDelta.width / delta.width),
									  ((delta.height == 0) ? 0 : XYDelta.height / delta.height));
		RMProjectedRect newBounds=pBounds;

		//move the rect by delta
		newBounds.origin.northing -= XYDelta.height;
		newBounds.origin.easting -= XYDelta.width; 

		// see if new bounds are within constrained bounds, and constrain if necessary
        BOOL constrained = NO;
		if ( newBounds.origin.northing < SWconstraint.northing ) { newBounds.origin.northing = SWconstraint.northing; constrained = YES; }
        if ( newBounds.origin.northing+newBounds.size.height > NEconstraint.northing ) { newBounds.origin.northing = NEconstraint.northing - newBounds.size.height; constrained = YES; }
        if ( newBounds.origin.easting < SWconstraint.easting ) { newBounds.origin.easting = SWconstraint.easting; constrained = YES; }
        if ( newBounds.origin.easting+newBounds.size.width > NEconstraint.easting ) { newBounds.origin.easting = NEconstraint.easting - newBounds.size.width; constrained = YES; }
        if ( constrained ) 
        {
            // Adjust delta to match constraint
            XYDelta.height = pBounds.origin.northing - newBounds.origin.northing;
            XYDelta.width = pBounds.origin.easting - newBounds.origin.easting;
            delta = CGSizeMake(((sizeRatio.width == 0) ? 0 : XYDelta.width / sizeRatio.width), 
                               ((sizeRatio.height == 0) ? 0 : XYDelta.height / sizeRatio.height));
        }
	}

	if (_delegateHasBeforeMapMove) [delegate beforeMapMove:self];
	[contents moveBy:delta];
	if (_delegateHasAfterMapMove) [delegate afterMapMove:self];
}
 
- (void)zoomByFactor:(float)zoomFactor near:(CGPoint)center
{
	[self zoomByFactor:zoomFactor near:center animated:NO];
}

- (void)zoomByFactor:(float)zoomFactor near:(CGPoint)center animated:(BOOL)animated
{
	if (_constrainMovement)
	{
		//check that bounds after zoom don't exceed map constraints
		//the logic is copued from the method zoomByFactor,
		float _zoomFactor = [self.contents adjustZoomForBoundingMask:zoomFactor];
		float zoomDelta = log2f(_zoomFactor);
		float targetZoom = zoomDelta + [self.contents zoom];
		BOOL canZoom=NO;
		if (targetZoom == [self.contents zoom]){
			//OK... . I could even do a return here.. but it will hamper with future logic..
			canZoom=YES;
		}
		// clamp zoom to remain below or equal to maxZoom after zoomAfter will be applied
		if(targetZoom > [self.contents maxZoom]){
			zoomFactor = exp2f([self.contents maxZoom] - [self.contents zoom]);
		}
		
		// clamp zoom to remain above or equal to minZoom after zoomAfter will be applied
		if(targetZoom < [self.contents minZoom]){
			zoomFactor = 1/exp2f([self.contents zoom] - [self.contents minZoom]);
		}
		
		//bools for syntactical sugar to understand the logic in the if statement below
		BOOL zoomAtMax = ([self.contents  zoom] == [self.contents  maxZoom]);
		BOOL zoomAtMin = ([self.contents  zoom] == [self.contents  minZoom]);
		BOOL zoomGreaterMin = ([self.contents  zoom] > [self.contents  minZoom]);
		BOOL zoomLessMax = ([self.contents  zoom] < [ self.contents maxZoom]);
		
		//zooming in zoomFactor > 1
		//zooming out zoomFactor < 1
		
		if ((zoomGreaterMin && zoomLessMax) || (zoomAtMax && zoomFactor<1) || (zoomAtMin && zoomFactor>1))
		{
			//if I'm here it means I could zoom, now we have to see what will happen after zoom
			RMMercatorToScreenProjection *mtsp= self.contents.mercatorToScreenProjection ;
			
			//get copies of mercatorRoScreenProjection's data
			RMProjectedPoint origin=[mtsp origin];
			float metersPerPixel=mtsp.metersPerPixel;
			CGRect screenBounds=[mtsp screenBounds];
			
			//tjis is copied from [RMMercatorToScreenBounds zoomScreenByFactor]
			// First we move the origin to the pivot...
			origin.easting += center.x * metersPerPixel;
			origin.northing += (screenBounds.size.height - center.y) * metersPerPixel;
			// Then scale by 1/factor
			metersPerPixel /= _zoomFactor;
			// Then translate back
			origin.easting -= center.x * metersPerPixel;
			origin.northing -= (screenBounds.size.height - center.y) * metersPerPixel;
			
			origin = [mtsp.projection wrapPointHorizontally:origin];
			
			//calculate new bounds
			RMProjectedRect zRect;
			zRect.origin = origin;
			zRect.size.width = screenBounds.size.width * metersPerPixel;
			zRect.size.height = screenBounds.size.height * metersPerPixel;
			 
			//can zoom only if within bounds
			canZoom= !(zRect.origin.northing < SWconstraint.northing || zRect.origin.northing+zRect.size.height> NEconstraint.northing ||
			  zRect.origin.easting < SWconstraint.easting || zRect.origin.easting+zRect.size.width > NEconstraint.easting);
				
		}
		
		if(!canZoom){
			RMLog(@"Zooming will move map out of bounds: no zoom");
			return;
		}
	
	}
	
	if (_delegateHasBeforeMapZoomByFactor) [delegate beforeMapZoom:self byFactor:zoomFactor near:center];
	[contents zoomByFactor:zoomFactor near:center animated:animated withCallback:(animated && _delegateHasAfterMapZoomByFactor) ? self : nil];

	if (!animated)
		if (_delegateHasAfterMapZoomByFactor) [delegate afterMapZoom:self byFactor:zoomFactor near:center];
}

- (void)zoomWithLatLngBoundsNorthEast:(CLLocationCoordinate2D)ne SouthWest:(CLLocationCoordinate2D)sw
{
    [contents zoomWithLatLngBoundsNorthEast:ne SouthWest:sw];
    [self moveBy:CGSizeZero];
}

#pragma mark RMMapContentsAnimationCallback methods

- (void)animationFinishedWithZoomFactor:(float)zoomFactor near:(CGPoint)p
{
	if (_delegateHasAfterMapZoomByFactor)
		[delegate afterMapZoom:self byFactor:zoomFactor near:p];
}

#pragma mark Event handling

- (RMGestureDetails)gestureDetails:(NSSet *)touches
{
	RMGestureDetails gesture;
	gesture.center.x = gesture.center.y = 0;
	gesture.averageDistanceFromCenter = 0;
	gesture.angle = 0.0;

	int interestingTouches = 0;

	for (UITouch *touch in touches)
	{
		if ([touch phase] != UITouchPhaseBegan
			&& [touch phase] != UITouchPhaseMoved
			&& [touch phase] != UITouchPhaseStationary)
			continue;
		//		RMLog(@"phase = %d", [touch phase]);
    
		interestingTouches++;

		CGPoint location = [touch locationInView: self];

		gesture.center.x += location.x;
		gesture.center.y += location.y;
	}

	if (interestingTouches == 0)
	{
		gesture.center = lastGesture.center;
		gesture.numTouches = 0;
		gesture.averageDistanceFromCenter = 0.0f;
		return gesture;
	}

	//	RMLog(@"interestingTouches = %d", interestingTouches);

	gesture.center.x /= interestingTouches;
	gesture.center.y /= interestingTouches;

	for (UITouch *touch in touches)
	{
		if ([touch phase] != UITouchPhaseBegan
			&& [touch phase] != UITouchPhaseMoved
			&& [touch phase] != UITouchPhaseStationary)
			continue;

		CGPoint location = [touch locationInView: self];

		//		RMLog(@"For touch at %.0f, %.0f:", location.x, location.y);
		float dx = location.x - gesture.center.x;
		float dy = location.y - gesture.center.y;
		//		RMLog(@"delta = %.0f, %.0f  distance = %f", dx, dy, sqrtf((dx*dx) + (dy*dy)));
		gesture.averageDistanceFromCenter += sqrtf((dx*dx) + (dy*dy));
	}

	gesture.averageDistanceFromCenter /= interestingTouches;
	gesture.numTouches = interestingTouches;

	if ([touches count] == 2)
	{
		CGPoint first = [[[touches allObjects] objectAtIndex:0] locationInView:[self superview]];
		CGPoint second = [[[touches allObjects] objectAtIndex:1] locationInView:[self superview]];
		CGFloat height = second.y - first.y;
        CGFloat width = first.x - second.x;
        gesture.angle = atan2(height,width);
	}

	return gesture;
}

- (void)handleLongPress
{
    if (_delegateHasLongSingleTapOnMap)
        [delegate longSingleTapOnMap:self at:_longPressPosition];
}

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
	UITouch *touch = [[touches allObjects] objectAtIndex:0];
	//Check if the touch hit a RMMarker subclass and if so, forward the touch event on
	//so it can be handled there
	id furthestLayerDown = [contents.overlay hitTest:[touch locationInView:self]];
	if ([[furthestLayerDown class]isSubclassOfClass: [RMMarker class]]) {
		if ([furthestLayerDown respondsToSelector:@selector(touchesBegan:withEvent:)]) {
			[furthestLayerDown performSelector:@selector(touchesBegan:withEvent:) withObject:touches withObject:event];
			return;
		}
	}

	//	RMLog(@"touchesBegan %d", [[event allTouches] count]);
	lastGesture = [self gestureDetails:[event allTouches]];

	if (deceleration)
	{
		if (_decelerationTimer != nil) {
			[self stopDeceleration];
		}
	}

    _longPressPosition = lastGesture.center;
    [NSObject cancelPreviousPerformRequestsWithTarget:self selector:@selector(handleLongPress) object:nil];

    if (lastGesture.numTouches == 1) {
        CALayer* hit = [contents.overlay hitTest:[touch locationInView:self]];
        if (!hit || ![hit isKindOfClass: [RMMarker class]]) {            
            [self performSelector:@selector(handleLongPress) withObject:nil afterDelay:0.5];
        }
    }
}

// \bug touchesCancelled should clean up, not pass event to markers
- (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event
{
	UITouch *touch = [[touches allObjects] objectAtIndex:0];
	
    [NSObject cancelPreviousPerformRequestsWithTarget:self selector:@selector(handleLongPress) object:nil];

	//Check if the touch hit a RMMarker subclass and if so, forward the touch event on
	//so it can be handled there
	id furthestLayerDown = [contents.overlay hitTest:[touch locationInView:self]];
	if ([[furthestLayerDown class]isSubclassOfClass: [RMMarker class]]) {
		if ([furthestLayerDown respondsToSelector:@selector(touchesCancelled:withEvent:)]) {
			[furthestLayerDown performSelector:@selector(touchesCancelled:withEvent:) withObject:touches withObject:event];
			return;
		}
	}

	// I don't understand what the difference between this and touchesEnded is.
	[self touchesEnded:touches withEvent:event];
}

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
	UITouch *touch = [[touches allObjects] objectAtIndex:0];

	//Check if the touch hit a RMMarker subclass and if so, forward the touch event on
	//so it can be handled there
	id furthestLayerDown = [contents.overlay hitTest:[touch locationInView:self]];
	if ([[furthestLayerDown class]isSubclassOfClass: [RMMarker class]]) {
		if ([furthestLayerDown respondsToSelector:@selector(touchesEnded:withEvent:)]) {
			[furthestLayerDown performSelector:@selector(touchesEnded:withEvent:) withObject:touches withObject:event];
			return;
		}
	}
	NSInteger lastTouches = lastGesture.numTouches;

	// Calculate the gesture.
	lastGesture = [self gestureDetails:[event allTouches]];

    BOOL decelerating = NO;

    [NSObject cancelPreviousPerformRequestsWithTarget:self selector:@selector(handleLongPress) object:nil];

    if (touch.tapCount >= 2)
	{
        BOOL twoFingerTap = [touches count] >= 2;
		if (_delegateHasDoubleTapOnMap) {
            if (twoFingerTap) {
                if (_delegateHasDoubleTapTwoFingersOnMap) [delegate doubleTapTwoFingersOnMap:self at:lastGesture.center];
            } else {
                if (_delegateHasDoubleTapOnMap) [delegate doubleTapOnMap: self at:lastGesture.center];
            }
		} else {
			// Default behaviour matches built in maps.app
            float nextZoomFactor = 0;
            if (twoFingerTap) {
                nextZoomFactor = [contents prevNativeZoomFactor];
            } else {
                nextZoomFactor = [contents nextNativeZoomFactor];
            }
            if (nextZoomFactor != 0)
                [self zoomByFactor:nextZoomFactor near:[touch locationInView:self] animated:YES];
		}
	} else if (lastTouches == 1 && touch.tapCount != 1) {
		// deceleration
		if(deceleration && enableDragging)
		{
			CGPoint prevLocation = [touch previousLocationInView:self];
			CGPoint currLocation = [touch locationInView:self];
			CGSize touchDelta = CGSizeMake(currLocation.x - prevLocation.x, currLocation.y - prevLocation.y);
			[self startDecelerationWithDelta:touchDelta];
            decelerating = YES;
		}
	}

	if (touch.tapCount == 1) 
	{
		if (lastGesture.numTouches == 0)
		{
			CALayer *hit = [contents.overlay hitTest:[touch locationInView:self]];
			//		RMLog(@"LAYER of type %@",[hit description]);
			
			if (hit != nil)
            {
				CALayer *superlayer = [hit superlayer]; 

				// See if tap was on a marker or marker label and send delegate protocol method
				if ([hit isKindOfClass: [RMMarker class]]) {
					if (_delegateHasTapOnMarker) {
						[delegate tapOnMarker:(RMMarker *)hit onMap:self];
					}
				} else if (superlayer != nil && [superlayer isKindOfClass: [RMMarker class]]) {
					if (_delegateHasTapOnLabelForMarker) {
						[delegate tapOnLabelForMarker:(RMMarker *)superlayer onMap:self];
					}
				} else if ([superlayer superlayer] != nil && [[superlayer superlayer] isKindOfClass:[RMMarker class]]) {
                    if (_delegateHasTapOnLabelForMarker) {
                        [delegate tapOnLabelForMarker:(RMMarker *)[superlayer superlayer] onMap:self];
                    }
				} else if (_delegateHasSingleTapOnMap) {
					[delegate singleTapOnMap:self at:[touch locationInView:self]];
				}
			}
		}
		else if (!enableDragging && (lastGesture.numTouches == 1))
		{
			float prevZoomFactor = [contents prevNativeZoomFactor];
			if (prevZoomFactor != 0)
				[self zoomByFactor:prevZoomFactor near:[touch locationInView:self] animated:YES];
		}
	}

	if (_delegateHasAfterMapTouch) [delegate afterMapTouch:self];
}

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
	UITouch *touch = [[touches allObjects] objectAtIndex:0];

	//Check if the touch hit a RMMarker subclass and if so, forward the touch event on
	//so it can be handled there
	id furthestLayerDown = [contents.overlay hitTest:[touch locationInView:self]];
	if ([[furthestLayerDown class]isSubclassOfClass: [RMMarker class]]) {
		if ([furthestLayerDown respondsToSelector:@selector(touchesMoved:withEvent:)]) {
			[furthestLayerDown performSelector:@selector(touchesMoved:withEvent:) withObject:touches withObject:event];
			return;
		}
	}

    RMGestureDetails newGesture = [self gestureDetails:[event allTouches]];
    CGPoint newLongPressPosition = newGesture.center;
    CGFloat dx = newLongPressPosition.x - _longPressPosition.x;
    CGFloat dy = newLongPressPosition.y - _longPressPosition.y;
    if (sqrt(dx*dx + dy*dy) > 5)
        [NSObject cancelPreviousPerformRequestsWithTarget:self selector:@selector(handleLongPress) object:nil];

	CALayer* hit = [contents.overlay hitTest:[touch locationInView:self]];
//	RMLog(@"LAYER of type %@",[hit description]);

	if (hit != nil)
    {   
      if ([hit isKindOfClass: [RMMarker class]]) {
         if (!_delegateHasShouldDragMarker || (_delegateHasShouldDragMarker && [delegate mapView:self shouldDragMarker:(RMMarker *)hit withEvent:event])) {
            if (_delegateHasDidDragMarker) {
               [delegate mapView:self didDragMarker:(RMMarker *)hit withEvent:event];
               return;
            }
         }
      }
	}

	if (enableRotate && (newGesture.numTouches == lastGesture.numTouches))
	{
        if (newGesture.numTouches == 2)
        {
            CGFloat angleDiff = lastGesture.angle - newGesture.angle;
            CGFloat newAngle = self.rotation + angleDiff;

            [self setRotation:newAngle];
        }
	}

	if (enableDragging && newGesture.numTouches == lastGesture.numTouches)
	{
		CGSize delta;
		delta.width = newGesture.center.x - lastGesture.center.x;
		delta.height = newGesture.center.y - lastGesture.center.y;
    
		if (enableZoom && newGesture.numTouches > 1)
		{
			NSAssert (lastGesture.averageDistanceFromCenter > 0.0f && newGesture.averageDistanceFromCenter > 0.0f,
					  @"Distance from center is zero despite >1 touches on the screen");

			double zoomFactor = newGesture.averageDistanceFromCenter / lastGesture.averageDistanceFromCenter;

			[self moveBy:delta];
			[self zoomByFactor: zoomFactor near: newGesture.center];
		}
		else {
			[self moveBy:delta];
		}
	}

	lastGesture = newGesture;
}

#pragma mark Deceleration

- (void)startDecelerationWithDelta:(CGSize)delta
{
	if (ABS(delta.width) >= 1.0f && ABS(delta.height) >= 1.0f)
    {
		_decelerationDelta = delta;
        if ( !_decelerationTimer ) {
            _decelerationTimer = [NSTimer scheduledTimerWithTimeInterval:0.01f 
                                                                  target:self
                                                                selector:@selector(incrementDeceleration:) 
                                                                userInfo:nil 
                                                                 repeats:YES];
        }
	}
}

- (void)incrementDeceleration:(NSTimer *)timer
{
	if (ABS(_decelerationDelta.width) < kMinDecelerationDelta && ABS(_decelerationDelta.height) < kMinDecelerationDelta) {
		[self stopDeceleration];
		return;
	}

	// avoid calling delegate methods? design call here
	[self moveBy:_decelerationDelta];

	_decelerationDelta.width *= [self decelerationFactor];
	_decelerationDelta.height *= [self decelerationFactor];
}

- (void)stopDeceleration
{
	if (_decelerationTimer != nil) {
		[_decelerationTimer invalidate]; _decelerationTimer = nil;
		_decelerationDelta = CGSizeZero;

		// call delegate methods; design call (see above)
		[self moveBy:CGSizeZero];
	}

    if (_delegateHasAfterMapMoveDeceleration)
        [delegate afterMapMoveDeceleration:self];
}

// Must be called by higher didReceiveMemoryWarning
- (void)didReceiveMemoryWarning
{
	LogMethod();
	[contents didReceiveMemoryWarning];
}

- (void)setFrame:(CGRect)frame
{
    CGRect r = self.frame;
    [super setFrame:frame];

    // only change if the frame changes AND there is contents
    if (!CGRectEqualToRect(r, frame) && contents) {
        [contents setFrame:frame];
    }
}

- (void)setRotation:(CGFloat)angle
{
 	if (_delegateHasBeforeMapRotate) [delegate beforeMapRotate:self fromAngle:rotation];

	[CATransaction begin];
	[CATransaction setValue:[NSNumber numberWithFloat:0.0f] forKey:kCATransactionAnimationDuration];
	[CATransaction setValue:(id)kCFBooleanTrue forKey:kCATransactionDisableActions];

	rotation = angle;

	self.transform = CGAffineTransformMakeRotation(rotation);
	[contents setRotation:rotation];

	[CATransaction commit];

 	if (_delegateHasAfterMapRotate) [delegate afterMapRotate:self toAngle:rotation];
}

@end