MFC和Gdi+实现图片雾化

野性酷女 2022-05-22 07:09 179阅读 0赞

1.创建一个基于对话框的程序

2.添加对Gdi+的支持

3.在对话框类中添加公有成员

Gdiplus::Bitmap *m_IamgeShow;
    Gdiplus::RectF m_rect;
    void ImageAtomization(Gdiplus::Bitmap *pImage);
    CString m_FileName;

在Initstance()函数中初始化

m_ImageShow=NULL;
    m_FileName=_T("");
    CRect rc;
    GetClientRect(&rc);
    m_rect.X=rc.left;
    m_rect.Y=rc.top;
    m_rect.Width=rc.Width();
    m_rect.Height=rc.Height();

3.接下来我们编写雾化操作的具体代码

void CMFCApplication1Dlg::ImageAtomization(Gdiplus::Bitmap *pImage)
    {
    int width=m_rect.Width;
    int height=m_recr.Height;
    for(int x=1;x<width;x++)
       for(int y=1;y<height;y++)
      {
      Color color;
      double f=RAND_MAX;
      int k=(int)(24*rand()/f);
      dx=x+k%15;
      dy=y+k%15;
      if(dx>width）
       dx=width-1;
      if(dy>height)
       dy=height-1;
    pImage->GetPixel(x,y,&color);
    PImage->SetPixel(dx,dy,color);
      }
    }

4.接下来我们添加鼠标左键单击消息和计时器消息

void CMFCApplication1Dlg::OnLButtonDown(UINT nFlags, CPoint point)
    {
    	// TODO: 在此添加消息处理程序代码和/或调用默认值
    	if (m_ImageShow == NULL)
    	{
    		MessageBox(_T("没有图像文件是不能执行此项操作的!"), _T("信息提示"), MB_OK);
    		return;
    	}
    	
    	this->DiffuseImage(m_ImageShow);
    	
    	CDialogEx::OnLButtonDown(nFlags, point);
    }

void CMFCApplication1Dlg::OnTimer(UINT_PTR nIDEvent)
    {
    	// TODO: 在此添加消息处理程序代码和/或调用默认值
    	HDC hdc = ::GetDC(GetSafeHwnd());
    	CDC m_dcMemory;
    	CDC* dc = CClientDC::FromHandle(hdc);
    	m_dcMemory.CreateCompatibleDC(dc);
    	CRect rc;
    	GetClientRect(&rc);
    	CBitmap bmp;
    	bmp.CreateCompatibleBitmap(dc, rc.Width(), rc.Height());
    	CBitmap *pOldbmp=m_dcMemory.SelectObject(&bmp);
    	Graphics gh(m_dcMemory.GetSafeHdc());
    	gh.Clear(Color(128, 128, 12));
    
    	gh.DrawImage(m_ImageShow, 0,0, rc.Width(), rc.Height());
    
    	::BitBlt(hdc,0, 0, rc.Width(), rc.Height(),m_dcMemory.GetSafeHdc(), 0, 0, SRCCOPY);
    
    	dc->DeleteDC();
    	m_dcMemory.SelectObject(pOldbmp);
    	DeleteObject(bmp);
    	ReleaseDC(&m_dcMemory);
    
    	CDialogEx::OnTimer(nIDEvent);
    }

在Initstance函数中添加

SetTimer(1,100,NULL);

5,将对话框 确定按钮标题修改为"打开”ID为ID\_OPEN  
添加事件处理

void CMFCApplication1Dlg::OnBnClickedFileOpen()
    {
    	// TODO: 在此添加控件通知处理程序代码
    	CString strFilter = _T("All Files(*.*)|*.*|");
    	//打开文件对话框
    	CFileDialog dlg(TRUE, NULL, NULL, OFN_HIDEREADONLY, strFilter);
    	int hResult = (int)dlg.DoModal();
    	if (hResult != IDOK)
    	{
    		return;
    	}
    	m_StrImageFileName.Format(dlg.GetPathName());
    	//装入图像文件
    	m_ImageShow = NULL;
    	m_ImageShow = Bitmap::FromFile(m_StrImageFileName);
    	if (!m_ImageShow)
    	{
    		MessageBox(_T("装入图像操作失败"), _T("错误信息提示"), MB_OK);
    		return;
    	}
    }

效果

![70][]

![70 1][]

![70 2][]

[70]: /images/20220522/c3f926c219c44c709674d41c88ef29a4.png
[70 1]: /images/20220522/81c1c7a13f9a411891b3648535ee8ed0.png
[70 2]: /images/20220522/e38580c0087743a994fcd252bc13bfef.png