1 /*

     2 * Copyright (c) 2008 Nokia Corporation and/or its subsidiary(-ies).

     3 * All rights reserved.

     4 * This component and the accompanying materials are made available

     5 * under the terms of the License "Eclipse Public License v1.0"

     6 * which accompanies this distribution, and is available

     7 * at the URL "http://www.eclipse.org/legal/epl-v10.html".

     8 *

     9 * Initial Contributors:

    10 * Nokia Corporation - initial contribution.

    11 *

    12 * Contributors:

    13 *

    14 * Description:  Gesture recognition utilities

    15 *

    16 */

    17 

    18 

    19 #include "utils.h"

    20 

    21 #include <coemain.h> // for CCoeEnv

    22 #include <eikappui.h>  // for CEikAppUi

    23 

    24 #include "gesturedefs.h"

    25 

    26 namespace RT_GestureHelper

    27     {

    28     /** @return the longer edge of the size */

    29     inline TInt LongerEdge( const TSize& aSize ) 

    30         {

    31         return Max( aSize.iHeight, aSize.iWidth );

    32         }

    33     

    34     // for documentation, see header file

    35     TRect ToleranceRect( const TPoint& aCenterPoint ) 

    36         {

    37         /*

    38         TSize screenSize = static_cast<CEikAppUi*>( CCoeEnv::Static()->AppUi() )

    39             ->ApplicationRect().Size(); 

    40         // multiplication has to be done first, to avoid rounding integer to 0 with division

    41         int toleranceLength = ( KGestureTolerancePercent * LongerEdge( screenSize ) ) / 100; 

    42         */

    43         long toleranceLength = Mm2Pixels(KFingerSize_mm) / 2;

    44         TRect toleranceRect( aCenterPoint, TSize() );

    45         // grow by the tolerance length, while keeping the center point

    46         toleranceRect.Shrink( -toleranceLength, -toleranceLength );

    47         return toleranceRect;

    48         }

    49     

    50     long Twips2Pixels(long twips) 

    51         {

    52         CWsScreenDevice* screen = CCoeEnv::Static()->ScreenDevice();

    53         TZoomFactor deviceMap(screen);

    54         deviceMap.SetZoomFactor(TZoomFactor::EZoomOneToOne);

    55         long px = deviceMap.VerticalTwipsToPixels(twips); //assuming that vertical

    56         return px;                                        //the same as horizontal

    57         

    58         }

    59     

    60     long Mm2Pixels(long mm) 

    61         {

    62         return Twips2Pixels(mm * KTwipsInMm); 

    63         }

    64     

    65     long Inches2Pixels(double inches) 

    66         {

    67         return Twips2Pixels(inches * KTwipsInInch); 

    68         }

    69 

    70         

    71     } // namespace GestureHelper