/*

* 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:  Implemantation for CCamLineVfGridDrawer class.

*

*/

#include <gdi.h>

#include "camlinevfgriddrawer.h"

#include "camlogging.h"

// ======== LOCAL CONSTANTS ========

namespace

  {

  const TInt KArrayGranularity =   8;

  const TInt KMaxLineCount     =  64;

  const TInt KPenColorRed   = 255;

  const TInt KPenColorGreen =   0;//255;

  const TInt KPenColorBlue  =   0;//255;

  const TInt KPenColorAlpha = 255;//128;

  const TInt KPenWidth      =   2;

  const TInt KPenHeight     =   2;

  const CGraphicsContext::TPenStyle KPenStyle = CGraphicsContext::ESolidPen;  

  }

// ======== LOCAL FUNCTIONS ========

// ======== MEMBER FUNCTIONS ========

// ===========================================================================

// Public part

// ---------------------------------------------------------------------------

// static NewL

//

// 2-phased constructor

// ---------------------------------------------------------------------------

//

CCamLineVfGridDrawer* 

CCamLineVfGridDrawer::NewL()

  {

  CCamLineVfGridDrawer* self = new (ELeave) CCamLineVfGridDrawer;

  CleanupStack::PushL( self );

  self->ConstructL();

  CleanupStack::Pop( self );

  return self;

  }

// ---------------------------------------------------------------------------

// Destructor

// ---------------------------------------------------------------------------

//

CCamLineVfGridDrawer::~CCamLineVfGridDrawer()

  {

  PRINT( _L("Camera => ~CCamLineVfGridDrawer") );

  iLineArray.Reset();

  iLineArray.Close();

  PRINT( _L("Camera <= ~CCamLineVfGridDrawer") );

  }

// ---------------------------------------------------------------------------

// virtual InitL

// * from MCamVfGridDrawer

// 

// Initialize the drawer.

// ---------------------------------------------------------------------------

//

void 

CCamLineVfGridDrawer::InitL( TAny* /*aParam*/ )

  {

  }

// ---------------------------------------------------------------------------

// virtual Draw( CBitmapContext& )

//   * from MCamVfGridDrawer

// 

// Draw the grid. If not set visible nothing is drawn.

// ---------------------------------------------------------------------------

//

void 

CCamLineVfGridDrawer::Draw( CBitmapContext& aGc ) const

  {

  if( iVisible &&   

      iLineArray.Count() > 0 )

    {

    // Set drawing properties.

    aGc.SetPenStyle( iPenStyle );

    aGc.SetPenSize ( iPenSize  );

    aGc.SetPenColor( iPenColor );

    // Draw the lines

    for( TInt i = 0; i < iLineArray.Count(); i++ )

      {

      // Top-left and bottom-right corners of the rect 

      // represent the line ends.

      aGc.DrawLine( iLineArray[i].iTl, iLineArray[i].iBr );

      }

    // Clear any settings made to gc

    aGc.Reset();

    }

  else

    {

    // Not visible => draw nothing.

    }

  }

// ---------------------------------------------------------------------------

// virtual Draw( const TRect&, CBitmapContext& )

//   * from MCamVfGridDrawer

// 

// Draw part of the grid. If not set visible nothing is drawn.

// Note:

//   Only pure vertical and pure horizontal lines

//   get drawn to right place if lines expand outside

//   the aRect rectangle given here as parameter.

// ---------------------------------------------------------------------------

//

void 

CCamLineVfGridDrawer::Draw( const TRect&          aRect,

                                  CBitmapContext& aGc   ) const

  {

  if( iVisible &&   

      iLineArray.Count() > 0 )

    {

    // Limit the drawing to given rectangle.

    // Drawing outside this rectangle has no visible effect.

    aGc.SetClippingRect( aRect );

    // Make the same drawing operations as in full screen draw.

    // The drawing is so simple that any optimization is

    // probably more time consuming than the drawing itself.

    // Draw resets the gc in the end, so clipping rect is cleared.

    Draw( aGc );

    }

  else

    {

    // Not visible => draw nothing.

    }

  }

// ---------------------------------------------------------------------------

// virtual SetVisible

// * from MCamVfGridDrawer

// 

// Set visibility of the grid.

// 

// ---------------------------------------------------------------------------

//

void 

CCamLineVfGridDrawer::SetVisible( TBool aVisible )

  {

  iVisible = aVisible;

  }

// ---------------------------------------------------------------------------

// virtual IsVisible

// * from MCamVfGridDrawer

// 

// Get visibility of the grid.

// 

// ---------------------------------------------------------------------------

//

TBool

CCamLineVfGridDrawer::IsVisible() const

  {

  return iVisible;

  }

// ---------------------------------------------------------------------------

// SetLinesL

// * from MCamVfGridDrawer

// 

// Set the line end pair array.

// ---------------------------------------------------------------------------

//

void 

CCamLineVfGridDrawer::SetLinesL( const RLineArray& aLineArray )

  {

  TInt newLineCount = aLineArray.Count();

  if( newLineCount > KMaxLineCount )

    {

    User::Leave( KErrArgument );

    }

  iLineArray.Reset();

  for( TInt i = 0; i < newLineCount; i++ )

    {

    iLineArray.Append( aLineArray[i] );

    }

  }

// ---------------------------------------------------------------------------

// SetLinesL

// 

// Set the line end pair array by defining the count and bordered property

// of lines per horizontal and vertical axis.

// ---------------------------------------------------------------------------

//

void 

CCamLineVfGridDrawer::SetLinesL( const TRect& aDrawingRect, 

                                       TInt   aHorizontalLines, 

                                       TInt   aVerticalLines,

                                       TBool  aBorderedGrid /* = EFalse */)

  {

  // -------------------------------------------------------

  // Check the max limit for lines does not exceed.

  if( aHorizontalLines < 0

   || aVerticalLines   < 0

   || aHorizontalLines + aVerticalLines > KMaxLineCount

    )

    {

    User::Leave( KErrArgument );

    }

  // -------------------------------------------------------

  // Fill the line end array

  //

  // The lines are evenly spaced over the draw area axis in question.  

  // The aBorderedGrid parameter determines whether the grid 

  // draws lines to the borders of draw area:

  // E.g. 3 vertical lines: '[' and ']' are the draw area borders.

  //  aBorderedGrid: [|    |    |]

  // !aBorderedGrid: [  |  |  |  ]  

  //

  // The formula for the location of i:th line when N lines

  // are used along dimension D:

  // -  aBorderedGrid: (  i   * D) / (N - 1) 

  // - !aBorderedGrid: ((i+1) * D) / (N + 1) 

  // * Divide by (N-1) needs special handling with N=1.

  // * Half of pen width is subtracted from the above formula result

  //   to center the line to the calculated location.

  // * odd area or pen width/height may cause error of 1 pixel.

  TInt indexOffset = (aBorderedGrid ?  0 : 1);

  TInt countOffset = (aBorderedGrid ? -1 : 1);

  // -----------------------------------

  // First horizontal lines

  TInt height  = aDrawingRect.Height();

  TInt leftX   = aDrawingRect.iTl.iX;

  TInt rightX  = aDrawingRect.iBr.iX;

  TInt i = 0;

  while( i < aHorizontalLines )

    {

    // Max used to make sure no div-by-zero

    TInt currentY = ((i+indexOffset)*height) / Max(1,aHorizontalLines+countOffset) - KPenHeight/2;

    iLineArray.Append( TRect( leftX, currentY, rightX, currentY ) );

    i++;

    }

  // -----------------------------------

  // Then vertical lines

  TInt width   = aDrawingRect.Width();

  TInt topY    = aDrawingRect.iTl.iY;

  TInt bottomY = aDrawingRect.iBr.iY;

  TInt j = 0;

  while( j < aVerticalLines )

    {

    // Max used to make sure no div-by-zero

    TInt currentX = leftX + ((j+indexOffset)*width) / Max(1,aVerticalLines+countOffset) - KPenWidth/2;

    iLineArray.Append( TRect( currentX, topY, currentX, bottomY ) );

    j++;

    }

  // -------------------------------------------------------

  }

// ---------------------------------------------------------------------------

// SetPenStyle

// 

// Set the style of drawing pen.

// See CGraphicsContext.

// ---------------------------------------------------------------------------

//

void 

CCamLineVfGridDrawer::SetPenStyle( const CGraphicsContext::TPenStyle& aPenStyle )

  {

  iPenStyle = aPenStyle;

  }

// ---------------------------------------------------------------------------

// SetPenSize

// 

// Set the size of drawing pen.

// See CGraphicsContext.

// ---------------------------------------------------------------------------

//

void 

CCamLineVfGridDrawer::SetPenSize( const TSize& aPenSize )

  {

  iPenSize = aPenSize;

  }

// ---------------------------------------------------------------------------

// SetPenColor

// 

// Set the color of drawing pen.

// See CGraphicsContext.

// ---------------------------------------------------------------------------

//

void 

CCamLineVfGridDrawer::SetPenColor( const TRgb aPenColor )

  {

  iPenColor = aPenColor;

  }

// ===========================================================================

// Protected part

// ---------------------------------------------------------------------------

// ConstructL

// 

// 2nd phase constructor.

// ---------------------------------------------------------------------------

//

void 

CCamLineVfGridDrawer::ConstructL()

  {

  // empty

  }

// ===========================================================================

// Private part

// ---------------------------------------------------------------------------

// C++ constructor.

// Called in 1st phase of construction.

// ---------------------------------------------------------------------------

//

CCamLineVfGridDrawer::CCamLineVfGridDrawer()

  : iLineArray( KArrayGranularity ),

    iVisible( EFalse ),

    iPenStyle( KPenStyle ),

    iPenSize( KPenWidth, KPenHeight ),

    iPenColor( KPenColorRed, KPenColorGreen, KPenColorBlue, KPenColorAlpha )

  {

  // empty

  }

// ============================== end of file ================================