--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/photosgallery/viewframework/views/zoomview/inc/glxzoommathsengine.h	Thu Dec 17 08:45:44 2009 +0200
@@ -0,0 +1,124 @@
+/*
+* Copyright (c) 2008-2009 Nokia Corporation and/or its subsidiary(-ies). 
+* All rights reserved.
+* This component and the accompanying materials are made available
+* under the terms of "Eclipse Public License v1.0"
+* which accompanies this distribution, and is available
+* at the URL "http://www.eclipse.org/legal/epl-v10.html".
+*
+* Initial Contributors:
+* Nokia Corporation - initial contribution.
+*
+* Contributors:
+*
+* Description:     Declaration of Maths Engine
+*
+*/
+
+#ifndef GLXZOOMMATHSENGINE_H_
+#define GLXZOOMMATHSENGINE_H_
+
+
+// INCLUDE FILES
+#include <e32base.h>
+
+#include <glxzoomview.hrh>
+
+NONSHARABLE_CLASS( TGlxZoomAndPanMathsEngine )
+    {
+public:
+    
+    /**
+     * Starts panning with keys
+     *@ param aOffset:Specifies the offset value with which image has to be shifted/panned
+     */              
+    void Pan(TPoint aOffset, 
+            TPoint& aViewPortTopLeft,
+            TGlxPanIncrementType aPanIncrement,
+            TBool* aThresholdReached = NULL);
+
+    /**
+     * Starts zooming In/out with slider/Keys
+     * @ param aMfactor:The Zooming factor with which image has to be zoomed
+     */              
+    TInt Zoom( TZoomMode aZoomMode,         // Ignored when aExpectedZoomRatio has a value 
+                TInt aExpectedZoomRatio,    // only for slider based zoom. = 0 for key based zoom. 
+                TPoint& aViewPortTopLeft, 
+                TSize& aViewPortDimension,
+                TBool* apThresholdReached = NULL,
+                TPoint* apZoomFocus = NULL, 
+                TInt aRelativeZoomFactor = 0);
+    
+    // Initialize 
+    void Initialize(TPoint& aCenter, 
+            TSize& aScreenSize, 
+            TSize& aImageSize,
+            TSize& aOriginalZoomedDimensions, 
+            TUint8 aInitialZoomRatio);
+    
+    void UpdatePanFactor(TTime& aPanTime);
+    
+    // this can have a more generic name. but now it informs only abt screen orientation changes. and hence the name 
+    void OrientationChanged(const TRect& aNewScreenRect);
+    
+    TSize ImageVirtualSize();
+    
+    TSize ScreenSize();
+    
+    TInt NewCenterCoordinate(TInt Center, 
+            TInt Offset, 
+            TUint16 HalfScreenDimension, 
+            TInt MinimumCoordinate, 
+            TInt MaximumCoordinate, 
+            TBool *aLimitReached = NULL) ;
+    
+    void SetupPanOperation();
+    
+    TPoint LastPanOffset();
+
+private:
+
+    /**
+     * Get the next Zoomlevel on the basis of Zoom In/Out
+     *  @ param aZoomMode:Specifies the zoomode,whether it is Zoom In/Out
+     *  
+     *  We ignore aZoommode and aRelativeZoomFactor if we have a aExpectedZoomRatio.
+     *  We ignore aZoommode if we have a aRelativeZoomFactor.
+     *  
+     */          
+    TInt NewZoomRatio( 
+            TInt aExpectedZoomRatio,
+            TInt aRelativeZoomFactor,
+            TZoomMode aZoomMode,
+            TBool *aThresholdReached = NULL) ;
+    
+    TPoint          iCenter             ;
+    TSize           iScreenSize         ;
+    TSize           iImageVirtualSize   ;
+    TSize           iActualImageSize    ;
+    
+    // The Purpose of this Variable is to set the No:of pixels, by which it should Pan,
+    // when the Key is held for long time.
+    TUint8          iPanFactor          ;       
+    // No of continuous pan operations that have happened. This is used in calculating the pan factor  
+    TInt            iContinuousPanOperations;
+                                                 
+    // These are the thresholds
+    TUint8          iMaxZoomRatio;
+    TUint8          iMinZoomRatio   ;
+    TSize           iInitialImageSize   ;
+
+    // This is what our current zoom ratio is in percentage
+    TReal						iZoomRatio;
+    
+    TPoint          iPanSpeed;          //  Pixels Panned per pan operation in vector form.  
+    TPoint          iLastPanOffset;     //  Pixels Panned during the last pan operation.
+    
+    // [TODO]:Tsize might not be an exact match for this. using this only since it has exactly all the parameters that are required.   
+    TSize           iBorderWidth;
+
+    };
+
+
+
+#endif //GLXZOOMMATHSENGINE