MFC自绘-WzdImage图像类

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最近开始学习MFC自绘，自绘要有比较好的效果需要支持图像绘制，那就从图像类开始，那就用GDI+弄一个图像类。GDI（Graphics Device Interface）图形设备接口，处理所有Windows程序的图形输出。GDI+是以前版本GDI的继承者，对GDI进行了优化并添加了许多新的功能，只需调用GDI+库输出的类的一些方法即可完成图形操作。
头文件：

#include <GdiPlus.h>class CWzdImage{protected:    Gdiplus::Image* m_pImage;            // 图片对象    TCHAR m_strImageName[MAX_PATH];      // 图片名称public:    CWzdImage();            // 构造函数    virtual ~CWzdImage();   // 析构函数    bool IsNull();     // 是否加载    int GetWidth();    // 获取宽度    int GetHeight();   // 获取高度    bool DestroyImage();    // 销毁图片    // 加载图片    bool LoadImage(LPCTSTR pszFileName);    bool LoadImage(HINSTANCE hInstance, LPCTSTR pszResourceName);    // 绘画图像    bool DrawImage(CDC* pDC, int nWndX, int nWndY);    bool DrawImage(CDC* pDC, int nWndX, int nWndY, int nWndWidth, int nWndHeight);    bool DrawImage(CDC* pDC, int nWndX, int nWndY, int nWndWidth, int nWndHeight,                  int nImgX, int nImgY);    bool DrawImage(CDC* pDC, int nWndX, int nWndY, int nWndWidth, int nWndHeight,                  int nImgX, int nImgY, int nImgWidth, int nImgHeight);    // 透明绘画    bool AlphaDrawImage(CDC* pDC, int nWndX, int nWndY, BYTE cbAlphaDepth);    bool AlphaDrawImage(CDC* pDC, int nWndX, int nWndY, int nWndWidth,                       int nWndHeight, BYTE cbAlphaDepth);    bool AlphaDrawImage(CDC* pDC, int nWndX, int nWndY, int nWndWidth,                       int nWndHeight,int nImgX, int nImgY, BYTE cbAlphaDepth);    bool AlphaDrawImage(CDC* pDC, int nWndX, int nWndY, int nWndWidth,                       int nWndHeight,int nImgX, int nImgY, int nImgWidth, int nImgHeight, BYTE cbAlphaDepth);};

使用GDI+必须包含GdiPlus.h头文件，同时必须添加Gdiplus.lib静态库。另外初始化过程：

    GdiplusStartupInput input;    GdiplusStartup(&m_GdiplusToken,&input,NULL);

释放过程都是必要的。

    GdiplusShutdown(m_GdiplusToken);

Gdiplus::Image* m_pImage：保存图像信息。
IsNull()：判断是否有图像信息。
LoadImage()：两种加载图片方式：

一种调用Gdiplus::Image::FromFile()。
一种调用了FindResource()系列函数。再通过Gdiplus::Image::FromStream()读入数据。

DrawImage()：四种普通画图方式：

在图片指定点开始（nWndX, nWndY）画一次图。
在窗口指定区域（nWndX, nWndY，nWndWidth, nWndHeight）画整幅图。
在窗口指定区域（nWndX, nWndY，nWndWidth, nWndHeight）从图片的指定点(nImgX, nImgY)画一次图。
在窗口指定区域（nWndX, nWndY，nWndWidth, nWndHeight）用图片的指定区域(nImgX, nImgY，nImgWidth, nImgHeight)画一次图。

AlphaDrawImage()：四种透明绘图方式（必须在有背景的情况下）：

从窗口指定点（nWndX, nWndY）开始以透明度（cbAlphaDepth）画一次图
在窗口指定区域（nWndX, nWndY，nWndWidth, nWndHeight）以透明度（cbAlphaDepth）画整幅图。
在窗口指定区域（nWndX, nWndY，nWndWidth, nWndHeight）从图片的指定点(nImgX, nImgY)以透明度（cbAlphaDepth）画一次图。
在窗口指定区域（nWndX, nWndY，nWndWidth, nWndHeight）用图片的指定区域(nImgX, nImgY，nImgWidth, nImgHeight)以透明度（cbAlphaDepth）画一次图。

实现代码：

#include "stdafx.h"#include "WzdImage.h"// 构造函数CWzdImage::CWzdImage(): m_pImage(NULL){    memset(m_strImageName, 0 ,sizeof(m_strImageName));}// 析构函数CWzdImage::~CWzdImage(){    DestroyImage();}// 是否加载bool CWzdImage::IsNull(){    if (NULL == m_pImage) return true;    if (m_pImage->GetLastStatus() != Gdiplus::Ok) return true;    return false;}// 获取宽度int CWzdImage::GetWidth(){    if (IsNull()) return 0;    return m_pImage->GetWidth();}// 获取高度int CWzdImage::GetHeight(){    if (IsNull()) return 0;    return m_pImage->GetHeight();}// 销毁图片bool CWzdImage::DestroyImage(){    if (m_pImage!=NULL)    {        delete m_pImage;        m_pImage = NULL;    }    return true;}// 加载图片bool CWzdImage::LoadImage(LPCTSTR pszFileName){    if (NULL != m_pImage) return false;    // 加载文件    CT2CW strFileName(pszFileName);    m_pImage = Gdiplus::Image::FromFile((LPCWSTR)strFileName);    if ((NULL == m_pImage) || (Gdiplus::Ok != m_pImage->GetLastStatus()))    {        DestroyImage();        return false;    }    return true;}// 加载图片bool CWzdImage::LoadImage(HINSTANCE hInstance, LPCTSTR pszResourceName){    if (NULL != m_pImage) return false;    // 查找资源    HRSRC hResource = FindResource(hInstance, pszResourceName, _T("IMAGE"));    if (NULL == hResource) return false;    // 读取资源    DWORD dwImageSize = SizeofResource(hInstance, hResource);    LPVOID pImageBuffer = LoadResource(hInstance, hResource);    IStream * pIStream = NULL;    if (S_OK != CreateStreamOnHGlobal(NULL, TRUE, &pIStream))    {        return false;    }    // 写入数据    pIStream->Write(pImageBuffer, dwImageSize, NULL);    m_pImage= Gdiplus::Image::FromStream(pIStream);    pIStream->Release();    if ((NULL == m_pImage) || (Gdiplus::Ok != m_pImage->GetLastStatus()))    {        return false;    }    return true;}// 绘画图像: 从窗口指定点（nWndX，nWndY）开始画一次图bool CWzdImage::DrawImage(CDC* pDC, int nWndX, int nWndY){    int nImageWidth = m_pImage->GetWidth();    int nImageHeight = m_pImage->GetHeight();    return DrawImage(pDC, nWndX, nWndY, nImageWidth,        nImageHeight, 0, 0, nImageWidth, nImageHeight);}// 绘画图像: 在窗口指定区域（nWndX，nWndY，nWndWidth，nWndHeight）画整幅图bool CWzdImage::DrawImage( CDC* pDC, int nWndX, int nWndY, int nWndWidth, int nWndHeight){    return DrawImage(pDC, nWndX, nWndY, nWndWidth,        nWndHeight, 0, 0, GetWidth(), GetHeight());}// 绘画图像: 在窗口指定区域（nWndX，nWndY，nWndWidth，nWndHeight）从图片的指定点// (nImgX，nImgY)画一次图bool CWzdImage::DrawImage(CDC* pDC, int nWndX, int nWndY, int nWndWidth,     int nWndHeight, int nImgX, int nImgY){    return DrawImage(pDC, nWndX, nWndY, nWndWidth,        nWndHeight, nImgX, nImgY, nWndWidth, nWndHeight);}// 绘画图像: 在窗口指定区域（nWndX，nWndY，nWndWidth，nWndHeight）用图片的指定区域// (nImgX，nImgY，nImgWidth，nImgHeight)画一次图bool CWzdImage::DrawImage(CDC* pDC, int nWndX, int nWndY, int nWndWidth,     int nWndHeight, int nImgX, int nImgY, int nImgWidth, int nImgHeight){    if (NULL == m_pImage || NULL == pDC) return false;    //创建屏幕    Gdiplus::Graphics graphics(pDC->GetSafeHdc());    //构造位置    Gdiplus::RectF rcDrawRect;    rcDrawRect.X = (Gdiplus::REAL)nWndX;    rcDrawRect.Y = (Gdiplus::REAL)nWndY;    rcDrawRect.Width = (Gdiplus::REAL)nWndWidth;    rcDrawRect.Height = (Gdiplus::REAL)nWndHeight;    //绘画图像    graphics.DrawImage(m_pImage, rcDrawRect, (Gdiplus::REAL)nImgX, (Gdiplus::REAL)nImgY,        (Gdiplus::REAL)nImgWidth, (Gdiplus::REAL)nImgHeight, Gdiplus::UnitPixel);    return true;}// 透明绘画: 从窗口指定点（nWndX，nWndY）开始以透明度（cbAlphaDepth）画一次图bool CWzdImage::AlphaDrawImage(CDC* pDC, int nWndX, int nWndY, BYTE cbAlphaDepth){    int nImageWidth = m_pImage->GetWidth();    int nImageHeight = m_pImage->GetHeight();    return AlphaDrawImage(pDC, nWndX, nWndY, nImageWidth,        nImageHeight, 0, 0, nImageWidth, nImageHeight, cbAlphaDepth);}// 透明绘画: 在窗口指定区域（nWndX，nWndY，nWndWidth，nWndHeight）以透明度//（cbAlphaDepth）画整幅图bool CWzdImage::AlphaDrawImage( CDC* pDC, int nWndX, int nWndY, int nWndWidth,      int nWndHeight, BYTE cbAlphaDepth){    return AlphaDrawImage(pDC, nWndX, nWndY, nWndWidth,        nWndHeight, 0, 0, GetWidth(), GetHeight(), cbAlphaDepth);}// 透明绘画: 在窗口指定区域（nWndX，nWndY，nWndWidth，nWndHeight）从图片的指定点// (nImgX，nImgY)以透明度（cbAlphaDepth）画一次图bool CWzdImage::AlphaDrawImage(CDC* pDC, int nWndX, int nWndY, int nWndWidth, int nWndHeight, int nImgX, int nImgY, BYTE cbAlphaDepth){    return AlphaDrawImage(pDC, nWndX, nWndY, nWndWidth, nWndHeight,        nImgX, nImgY, nWndWidth, nWndHeight, cbAlphaDepth);}// 透明绘画: 在窗口指定区域（nWndX，nWndY，nWndWidth，nWndHeight）用图片的指定区域// (nImgX，nImgY，nImgWidth，nImgHeight)以透明度（cbAlphaDepth）画一次图bool CWzdImage::AlphaDrawImage(CDC* pDC, int nWndX, int nWndY, int nWndWidth, int nWndHeight, int nImgX, int nImgY, int nImgWidth, int nImgHeight, BYTE cbAlphaDepth){    //加载判断    ASSERT(m_pImage!=NULL);    if (m_pImage==NULL) return false;    //创建屏幕    ASSERT(pDC!=NULL);    Gdiplus::Graphics graphics(pDC->GetSafeHdc());    //构造位置    Gdiplus::RectF rcDrawRect;    rcDrawRect.X=(Gdiplus::REAL)nWndX;    rcDrawRect.Y=(Gdiplus::REAL)nWndY;    rcDrawRect.Width=(Gdiplus::REAL)nWndWidth;    rcDrawRect.Height=(Gdiplus::REAL)nWndHeight;    //透明矩阵    Gdiplus::ColorMatrix Matrix=    {        1.0f,0.0f,0.0f,0.0f,0.0f,        0.0f,1.0f,0.0f,0.0f,0.0f,        0.0f,0.0f,1.0f,0.0f,0.0f,        0.0f,0.0f,0.0f,cbAlphaDepth/255.0f,0.0f,        0.0f,0.0f,0.0f,0.0f,1.0f    };    //设置属性    Gdiplus::ImageAttributes Attributes;    Attributes.SetColorMatrix(&Matrix,Gdiplus::ColorMatrixFlagsDefault,                              Gdiplus::ColorAdjustTypeBitmap);    //绘画图像    graphics.DrawImage(m_pImage,rcDrawRect,(Gdiplus::REAL)nImgX,(Gdiplus::REAL)nImgY,    (Gdiplus::REAL)nImgWidth,(Gdiplus::REAL)nImgHeight,Gdiplus::UnitPixel,&Attributes);    return true;}

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