数组转换为Gdiplus::Bitmap

首先在某一个位置初始化对应的数组:

BOOL CCPUJuliaSetDlg::OnInitDialog()

{

      CDialogEx::OnInitDialog();

   …………..

   //为对话框添加关闭按钮

      LONG lStyle= GetWindowLong(this->m_hWnd, GWL_STYLE);

      lStyle |=WS_SYSMENU;

      SetWindowLong(this->m_hWnd,GWL_STYLE, lStyle);

 

      CRect rc;

      GetClientRect(&rc);

   // m_ImageDim是成员变量，类型是int

      m_ImageDim= min(rc.Width(), rc.Height());

   //生成对应的数组，m_pBuffer是成员变量

      m_pBuffer = new BYTE[m_ImageDim *m_ImageDim * 4];

      for(int y =0; y < m_ImageDim; ++y){

             for(intx = 0; x < m_ImageDim; ++x){

                    m_pBuffer[y* m_ImageDim*4 + x*4] = 0;//Blue

                    m_pBuffer[y* m_ImageDim*4 + x*4 + 1] = 0;//Green

                    m_pBuffer[y* m_ImageDim*4 + x*4 + 2] = 255 * CalculateJuliaSet(x, y);//Red

                    m_pBuffer[y* m_ImageDim*4 + x*4 + 3] = 255;//Alpha

             }

      }

      returnTRUE;  // 除非将焦点设置到控件，否则返回 TRUE

}

然后在OnPaint函数中利用Gdiplus::Bitmap的一个构造函数：

Bitmap(INT width, INT height, INT stride, PixelFormatformat, BYTE *scan0);

注意：在MSDN的解释中，stride也就是一幅图像一行的byte的数量（也就是图像宽度×每一像素的位平面数）必须是4的整数倍，我试了一下，如果不使用四通道，而采用3或者1通道，图像不会显示出来（很奇怪！！！）。下面的代码使用了Gdiplus，为了使Gdiplus生效，必须在构造函数中调用GdiplusStartup，在析构函数中GdiplusShutdown。

    在OnPaint函数中的代码：

void CCPUJuliaSetDlg::OnPaint()

{

      if(IsIconic())

      {

             CPaintDCdc(this); // 用于绘制的设备上下文

             SendMessage(WM_ICONERASEBKGND,

                                  reinterpret_cast<WPARAM>(dc.GetSafeHdc()),0);

             // 使图标在工作区矩形中居中

             intcxIcon = GetSystemMetrics(SM_CXICON);

             intcyIcon = GetSystemMetrics(SM_CYICON);

             CRectrect;

             GetClientRect(&rect);

             intx = (rect.Width() - cxIcon + 1) / 2;

             inty = (rect.Height() - cyIcon + 1) / 2;

             // 绘制图标

             dc.DrawIcon(x,y, m_hIcon);

      }

      else

      {

             //CDialogEx::OnPaint();

             CPaintDCdc(this);

             Graphicsg(dc.GetSafeHdc());

 

             //BitmapmemBitmap(m_ImageDim, m_ImageDim, 1*m_ImageDim,

 //PixelFormat8bppIndexed,m_pBuffer);

             //BitmapmemBitmap(m_ImageDim, m_ImageDim, 3*m_ImageDim,

//PixelFormat24bppRGB, m_pBuffer);

             BitmapmemBitmap(m_ImageDim, m_ImageDim, 4*m_ImageDim,

                                                PixelFormat32bppARGB,m_pBuffer);

             g.DrawImage(&memBitmap,0.0f, 0.0f, 0.0f, 0.0f,

(float)m_ImageDim, (float)m_ImageDim,UnitPixel);

            

      }

}