Collapse all Symbian^3 Product Developer Library
examples/Graphics/Bitmaps/Bitmap.cpp

00001 // Copyright (c) 2000-2009 Nokia Corporation and/or its subsidiary(-ies).
00002 // All rights reserved.
00003 // This component and the accompanying materials are made available
00004 // under the terms of "Eclipse Public License v1.0"
00005 // which accompanies this distribution, and is available
00006 // at the URL "http://www.eclipse.org/legal/epl-v10.html".
00007 //
00008 // Initial Contributors:
00009 // Nokia Corporation - initial contribution.
00010 //
00011 // Contributors:
00012 //
00013 // Description:
00014 //
00015 
00016 #include "BitmapsGraphicsControl.h"
00017 
00018 #include <grbmap.mbg>
00019 
00020 _LIT(KTxtZDrive,"Z:");
00021 
00022 void CBitmapControl::LoadBitmapL(CFbsBitmap* aBitMap,const TDesC& aPathAndFile,TInt aId,TBool aShareIfLoaded)
00023         {
00024         TParse mbfn;
00025         
00026         TDriveUnit sysDrive (RFs::GetSystemDrive());
00027         TDriveName sysDriveName (sysDrive.Name());      
00028         TFileName fileName(sysDriveName);
00029         fileName.Append(aPathAndFile);
00030 
00031         mbfn.Set(aPathAndFile,&fileName,NULL);
00032         if (!aBitMap->Load(mbfn.FullName(),aId,aShareIfLoaded))
00033                 return;
00034 
00035         mbfn.Set(aPathAndFile,&KTxtZDrive,NULL);
00036         User::LeaveIfError(aBitMap->Load(mbfn.FullName(),aId,aShareIfLoaded));
00037         return;
00038         }
00039 
00040         
00041         // Text printed to the console
00042 _LIT(KTxtCase0,"draw bitmap, centered on screen using block transfer");
00043 _LIT(KTxtCase1,"draw piece of bitmap using block transfer");
00044 _LIT(KTxtCase2,"draw bitmap described in twips using DrawBitmap()");
00045 _LIT(KTxtCase3,"draw stretched bitmap");
00046 _LIT(KTxtCase4,"tile rectangle, using bitmap as the brush pattern");
00047 _LIT(KTxtCase5,"tile rectangle, tiling around center of screen");
00048 _LIT(KTxtCase6,"masks: the problem of drawing a bitmap on different backgrounds");
00049 _LIT(KTxtCase7,"masks: using a mask to give a bitmap a transparent background");
00050 
00051         // The name of the multi-bitmap file containing the bitmap
00052         // and bitmap mask files.
00053 _LIT(KTxtMBMname,"\\resource\\apps\\grbmap.mbm");
00054 
00055 void CBitmapControl::UpdateModelL()
00056         {
00057                 // set up name for bitmap sharing
00058         TBool shareIfLoaded(ETrue);
00059         
00060                 switch (Phase())
00061                 {
00062                 case 0:
00063                         // load the bitmap and mask bitmap
00064                         iBitmap = new (ELeave) CFbsBitmap();
00065                         LoadBitmapL(iBitmap,KTxtMBMname,EMbmGrbmapSmiley,shareIfLoaded);
00066                         iMaskBitmap = new (ELeave) CFbsBitmap();
00067                         LoadBitmapL(iMaskBitmap,KTxtMBMname,EMbmGrbmapSmilmask,shareIfLoaded);
00068                         iGraphObserver->NotifyStatus(KTxtCase0);
00069                         break;
00070                 case 1:
00071                         iGraphObserver->NotifyStatus(KTxtCase1);
00072                         break;
00073                 case 2:
00074                         iGraphObserver->NotifyStatus(KTxtCase2);
00075                         break;
00076                 case 3:
00077                         iGraphObserver->NotifyStatus(KTxtCase3);
00078                         break;
00079                 case 4:
00080                         iGraphObserver->NotifyStatus(KTxtCase4);
00081                         break;
00082                 case 5:
00083                         iGraphObserver->NotifyStatus(KTxtCase5);
00084                         break;
00085                 case 6:
00086                         iGraphObserver->NotifyStatus(KTxtCase6);
00087                         break;
00088                 case 7:
00089                         iGraphObserver->NotifyStatus(KTxtCase7);
00090                         break;
00091                 }
00092         }
00093 
00094 void CBitmapControl::Draw(const TRect& /* aRect */) const
00095         {
00096         // draw surrounding rectangle
00097         CWindowGc& gc=SystemGc(); // graphics context we draw to
00098         gc.UseFont(iMessageFont); // use the system message font
00099         gc.Clear(); // clear the area to be drawn to
00100         SystemGc().DrawRect(Rect()); // surrounding rectangle to draw into
00101         TRect rect=Rect(); // a centered rectangle of the default size
00102         TRect bmpPieceRect=Rect(); // a rectangle to define a piece of bitmap
00103         TInt xDelta=0; // for x coordinates
00104         TInt yDelta=0; // for y coordinates
00105         TPoint screenCenterPoint=rect.Center(); // the center of the screen
00106         
00107         // decide what to do, and do it
00108         switch (Phase())
00109                 {
00110                 case 0:
00111                         // draw a whole bitmap centered on the screen,
00112                         // using bitmap block transfer
00113                         {
00114                         // calculate position for top left of bitmap so it is centered
00115                         TSize bmpSizeInPixels=iBitmap->SizeInPixels();
00116                         xDelta=(rect.Width()-bmpSizeInPixels.iWidth)/2;
00117                         yDelta=(rect.Height()-bmpSizeInPixels.iHeight)/2;
00118                         TPoint pos=TPoint(xDelta,yDelta); // displacement vector
00119                         pos+=rect.iTl; // bitmap top left corner position
00120                         gc.BitBlt(pos, iBitmap); // CWindowGc member function
00121                         }
00122                         break;
00123                 case 1:
00124                         // draw a rectangular piece of a bitmap, centered on the screen,
00125                         // using bitmap block transfer
00126                         {
00127                         // calculate bitmap piece, half size from center of source bitmap
00128                         TSize bmpSizeInPixels=iBitmap->SizeInPixels();
00129                         TSize bmpPieceSize(bmpSizeInPixels.iWidth*2/3,bmpSizeInPixels.iHeight*2/3);
00130                         TPoint bmpPieceTopLeft(0,0); 
00131                         bmpPieceRect.SetRect(bmpPieceTopLeft,bmpPieceSize); 
00132                         // calculate position for top left of bitmap piece so it is centered
00133                         xDelta=(rect.Width()-bmpPieceRect.Width())/2;
00134                         yDelta=(rect.Height()-bmpPieceRect.Height())/2;
00135                         TPoint pos=TPoint(xDelta,yDelta); // displacement vector
00136                         pos+=rect.iTl; // bitmap piece top left corner position
00137                         gc.BitBlt(pos, iBitmap, bmpPieceRect); // using bitmap piece
00138                         }
00139                         break;
00140                 case 2:
00141                         // draw a bitmap to a defined size in twips
00142                         // in the top left corner the rectangle,
00143                         // using the GDI DrawBitmap() function
00144                         {
00145                         TSize bmpSizeInTwips(600,600); // must set twips size, default (0,0)
00146                         iBitmap->SetSizeInTwips(bmpSizeInTwips);
00147                         gc.DrawBitmap(rect.iTl, iBitmap);
00148                         }
00149                         break;
00150                 case 3:
00151                         // draw a stretched bitmap inside the rectangle,
00152                         // using the GDI DrawBitmap() function
00153                         {
00154                         gc.DrawBitmap(rect, iBitmap);
00155                         }
00156                         break;
00157                 case 4:
00158                         {
00159                         // use bitmap as brush pattern, tiling from top left of rectangle
00160                         // set brush pattern and style to use the bitmap
00161                         gc.UseBrushPattern(iBitmap);
00162                         gc.SetBrushStyle(CGraphicsContext::EPatternedBrush);
00163                         gc.DrawRect(rect);
00164                         gc.DiscardBrushPattern();
00165                         }
00166                         break;
00167                 case 5:
00168                         {
00169                         // use bitmap as brush pattern, tiling around center of screen
00170                         // set brush pattern and style to use the bitmap
00171                         gc.SetBrushOrigin(screenCenterPoint);
00172                         gc.UseBrushPattern(iBitmap);
00173                         gc.SetBrushStyle(CGraphicsContext::EPatternedBrush);
00174                         gc.DrawRect(rect);
00175                         gc.DiscardBrushPattern();
00176                         }
00177                         break;
00178                 case 6:
00179                         // bisect screen into two different coloured rects
00180                         {
00181                         TRect screenRect=Rect();
00182                         TInt bisect = (screenRect.iBr.iX-screenRect.iTl.iX)/2 + screenRect.iTl.iX;
00183                         TRect leftRect(screenRect.iTl,TPoint(bisect,screenRect.iBr.iY));
00184                         TRect rightRect(TPoint(bisect,screenRect.iTl.iY),screenRect.iBr);
00185                         TRgb darkGray(85,85,85);
00186                         gc.SetBrushColor(darkGray);
00187                         gc.Clear(leftRect);
00188                         TRgb black(0,0,0);
00189                         gc.SetBrushColor(black);
00190                         gc.Clear(rightRect);
00191 
00192                         TSize bmpSizeInPixels=iBitmap->SizeInPixels();
00193                         TSize bmpPieceSize(bmpSizeInPixels.iWidth,bmpSizeInPixels.iHeight);
00194                         TPoint bmpPieceTopLeft(0,0); 
00195                         bmpPieceRect.SetRect(bmpPieceTopLeft,bmpPieceSize); 
00196                         
00197                         // center bitmap on left
00198                         xDelta=(leftRect.Width()-bmpPieceRect.Width())/2;
00199                         yDelta=(leftRect.Height()-bmpPieceRect.Height())/2;
00200                         TPoint pos=TPoint(xDelta,yDelta); // displacement vector
00201                         pos += leftRect.iTl; // bitmap piece top left corner position
00202                         gc.BitBlt(pos,iBitmap);
00203 
00204                         // center bitmap on right
00205                         xDelta=(rightRect.Width()-bmpPieceRect.Width())/2;
00206                         yDelta=(rightRect.Height()-bmpPieceRect.Height())/2;
00207                         TPoint pos2=TPoint(xDelta,yDelta); // displacement vector
00208                         pos2 += rightRect.iTl; // bitmap piece top left corner position
00209                         gc.BitBlt(pos2,iBitmap);
00210                         }
00211                         break;
00212                 case 7:
00213                         // bisect screen into two different coloured rects
00214                         {
00215                         TRect screenRect=Rect();
00216                         TInt bisect = (screenRect.iBr.iX-screenRect.iTl.iX)/2 + screenRect.iTl.iX;
00217                         TRect leftRect(TPoint(screenRect.iTl.iX,screenRect.iTl.iY+50),TPoint(bisect,screenRect.iBr.iY));
00218                         TRect rightRect(TPoint(bisect,screenRect.iTl.iY+50),screenRect.iBr);
00219                         TRgb darkGray(85,85,85);
00220                         gc.SetBrushColor(darkGray);
00221                         gc.Clear(leftRect);
00222                         TRgb black(0,0,0);
00223                         gc.SetBrushColor(black);
00224                         gc.Clear(rightRect);
00225 
00226                         TSize bmpSizeInPixels=iBitmap->SizeInPixels();
00227                         TSize bmpPieceSize(bmpSizeInPixels.iWidth,bmpSizeInPixels.iHeight);
00228                         TPoint bmpPieceTopLeft(0,0); 
00229                         bmpPieceRect.SetRect(bmpPieceTopLeft,bmpPieceSize); 
00230                         
00231                         // center bitmap on left
00232                         xDelta=(leftRect.Width()-bmpPieceRect.Width())/2;
00233                         yDelta=(leftRect.Height()-bmpPieceRect.Height())/2;
00234                         TPoint pos=TPoint(xDelta,yDelta); // displacement vector
00235                         pos += leftRect.iTl; // bitmap piece top left corner position
00236                         gc.BitBltMasked(pos,iBitmap,bmpPieceRect,iMaskBitmap,EFalse); // CWindowGc member function
00237 
00238                         // center bitmap on right
00239                         xDelta=(rightRect.Width()-bmpPieceRect.Width())/2;
00240                         yDelta=(rightRect.Height()-bmpPieceRect.Height())/2;
00241                         TPoint pos2=TPoint(xDelta,yDelta); // displacement vector
00242                         pos2 += rightRect.iTl; // bitmap piece top left corner position
00243                         gc.BitBltMasked(pos2,iBitmap,bmpPieceRect,iMaskBitmap,EFalse); // CWindowGc member function
00244                         
00245                         _LIT(KTxtTheBitmap,"The bitmap:");
00246                         _LIT(KTxtBitmapMask,"The bitmap's mask:");
00247 
00248                         gc.DrawText(KTxtTheBitmap,TPoint(5,20));
00249                         gc.BitBlt(TPoint(130,0),iBitmap);
00250                         gc.DrawText(KTxtBitmapMask,TPoint(197,20));
00251                         gc.BitBlt(TPoint(400,0),iMaskBitmap);
00252                         }
00253                         break;
00254                 default:
00255                         break;
00256                 }
00257         }
Generated by 1.6.2