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位图的显示

位图的显示. 实验四. 为应用程序制作一个封面窗口 , 在应用程序主窗口显示之前首先弹出封面窗口 , 窗口显示一个位图 ,5 秒钟后该窗口自动关闭 , 主窗口被打开。. CBitmap. 封装了 GDI 位图 bitmap 和对位图的各种操作 CBitmap::GetBitmap int GetBitmap( BITMAP* pBitMap BITMAP Structure { int bmType; int bmWidth; int bmHeight; int bmWidthBytes;

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位图的显示

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  1. 位图的显示

  2. 实验四 • 为应用程序制作一个封面窗口,在应用程序主窗口显示之前首先弹出封面窗口,窗口显示一个位图,5秒钟后该窗口自动关闭,主窗口被打开。

  3. CBitmap • 封装了GDI位图bitmap和对位图的各种操作 • CBitmap::GetBitmap int GetBitmap( BITMAP* pBitMap • BITMAP Structure{ int bmType; int bmWidth; int bmHeight; int bmWidthBytes; BYTE bmPlanes; BYTE bmBitsPixel; LPVOID bmBits; }

  4. CBitmap::LoadBitmap • BOOLLoadBitmap(UINTnIDResource); 装载位图资源,建立位图对象

  5. 内存DC • 内存DC是代表DC的一个内存块,经常用来准备在窗口DC上显示的位图 • CDC::CreateCompatibleDC virtualBOOLCreateCompatibleDC(CDC*pDC); 创建与pDC兼容的内存DC

  6. CDC::BitBlt 从内存dc拷贝位图 BOOLBitBlt( intx, inty, //目标DC中的起始点 intnWidth,intnHeight, //目标矩形和位图尺寸 CDC*pSrcDC, //源DC intxSrc,intySrc, //源DC中的起始点 DWORDdwRop);

  7. 三重光栅操作(源位图S、画刷P、目标位图D）Ternary Raster Operations SRCCOPY D=S SRCAND D=S AND D NOTSRCCOPYD=NOT S BLACKNESS D=BLCAK SRCPAINT D=S OR D MERGECOPY D=S OR P …

  8. CDC::StretchBlt 从内存DC拷贝位图,并作伸缩处理 BOOLStretchBlt( intx,inty, intnWidth,intnHeight, //目标dc的矩形区 CDC*pSrcDC, intxSrc,intySrc, intnSrcWidth,intnSrcHeight, //源dc的矩形区 DWORDdwRop);

  9. CDC::SetStretchBltMode • intSetStretchBltMode(intnStretchMode); • BLACKONWHITE • WHITEONBLACK //用于黑白位图 • COLORONCOLOR //用于彩色位图

  10. 在窗口显示位图 • 创建CBitmap 对象,并装载位图资源 CBitmap bmp; bmp.LoadBitmap(IDB_BITMAP1)) • 获取位图信息(大小) BITMAP bmpInfo; bmp.GetBitmap(&bmpInfo);

  11. 创建与显示DC兼容的内存DC CDC dcMemory; dcMemory.CreateCompatibleDC(pDC); • 将CBitmap对象选入内存DC CBitmap* pOldBitmap = dcMemory.SelectObject(&bmp); • 调用BitBlt或StrechBlt函数将内存DC的位图拷贝到窗口DC显示 pDC->SetStretchBltMode(COLORONCOLOR); pDC->StretchBlt(0, 0, rect.Width(), rect.Height(), &dcMemory, 0, 0,bmpInfo.bmWidth, bmpInfo.bmHeight, MERGECOPY );

  12. 裁剪区属性的使用

  13. CRgn BOOLCreateRectRgn(intx1,inty1,intx2,inty2); BOOLCreateEllipticRgn(intx1,inty1,intx2,inty2); BOOLCreatePolygonRgn(LPPOINTlpPoints,intnCount,intnMode);

  14. CDC::SelectClipRgn • virtualintSelectClipRgn(CRgn*pRgn); • intSelectClipRgn(CRgn*pRgn,intnMode);

  15. Example: CRgn rgn1,rgn2,rgn3; rgn1.CreateEllipticRgn( rect.left,rect.top,rect.right,rect.bottom); rgn2.CreateRectRgn(rect.left,rect.top,rect.right,rect.bottom); rgn2.CombineRgn(&rgn1,&rgn2,RGN_XOR); pDC->SelectClipRgn(&rgn2);

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