示例#1
0
/*
*--------------------------------------------------------------------------------
*  成员函数名   : OnPaint() 
*  功能描述     : 绘制窗体或窗体尺寸发生改变时重画窗体
*  算法			: 透明显示位图，透明色为 g_stuPaintSet.tranCol
*  附加说明		: 窗口缩放时图像并不改变，而是在显示时改变复制位图，然后缩放显示
*--------------------------------------------------------------------------------
*/
void CFloatDibWnd::OnPaint() 
{
	ASSERT(m_pDib);

	CRect rect;
	GetClientRect(&rect);

	// 用当前图像创建一个临时位图，对它进行缩放显示，以防失真
	CDib *pTmpDib = m_pDib->Clone();
	pTmpDib->ChangeImageSize(rect.Width(), rect.Height()); 
	pTmpDib->DisplayTransparent(GetDC(), 0, 0, g_stuPaintSet.tranCol);
	delete pTmpDib;

	CWnd::OnPaint();
}
示例#2
0
/*
*--------------------------------------------------------------------------------
*  函数名	: RotateAngle
*  功能		: 旋转浮动窗口
*  参数		: double angle	-	旋转的角度
*--------------------------------------------------------------------------------
*/
BOOL CFloatDibWnd::RotateAngle(double angle)
{
	// 因为是对源图像进行旋转操作，所以要把上一次旋转角度与此次旋转角度叠加
	m_dblPreRotateAngle += angle;
	if (m_dblPreRotateAngle > 360)
		m_dblPreRotateAngle -= 360;
	angle = m_dblPreRotateAngle;


	//对pDib操作实际上就是对m_pDib操作
	HBITMAP *m_hBitmap ;
	CDib * pDib; 
	pDib = m_pSrcDib->Clone();
		
	CPoint cirpoint;
	CRect rect;
	GetClientRect(&rect);
	
	
	//使源DIB缩放成当前画布区大小
	pDib->ChangeImageSize(rect.Width(), rect.Height()); 
	m_pDib->ChangeImageSize(rect.Width(), rect.Height()); 
	
	//得到图形矩形区的中心点坐标值
	cirpoint.x = rect.Width()/2;
	cirpoint.y = rect.Height()/2; 
	
	
	CClientDC dc(this);
	ASSERT_VALID(&dc);	
	   
	//以下生成一相要操作的源内存设备上下文，它同目的内存上下文数据一致
    BITMAP  srcbm;
	HBITMAP * hBitmap;
	CDC  srcDC; 
	CBitmap pBitmap;
	   
	// 产生源内存设备情境对象（为避免失真总是选用最初的源DIB）
	
	srcDC.CreateCompatibleDC(NULL);  
	hBitmap=(HBITMAP *)pDib->GetBitmap()->GetSafeHandle(); 
	srcDC.SetBkMode(TRANSPARENT); 
	   
	// 将位图选入源内存设备情境对象	   
	srcDC.SelectObject(hBitmap);
	GetObject(hBitmap, sizeof(srcbm),&srcbm);
	   
	//为使旋转的源和目的设备上下文一致，必须使目的DIB使用m_pDib
	   
	CDC *  MemDC = m_pDib->BeginPaint(&dc);
	MemDC->SetBkMode(TRANSPARENT); 
	   
	int i,j;
	BITMAP m_Bm ;
	   
	m_hBitmap = (HBITMAP *)m_pDib->GetBitmap()->GetSafeHandle();  
	   
	// 将目的位图选入内存设备情境对象(此时源及目的位图数据内容一致)
	MemDC->SelectObject(m_hBitmap);
	   
	GetObject(m_hBitmap, sizeof(m_Bm),&m_Bm);
	   
	//将目的内存设备上下文件全部填充为粉红色
	MemDC->FillSolidRect(CRect(0, 0, m_pDib->GetWidth(), m_pDib->GetHeight()),g_stuPaintSet.tranCol);
	   
	CPoint point1, point2;
	   
	point1.x = m_pDib->GetWidth()/ 2;
	point1.y = m_pDib->GetHeight()/ 2; 
	   
	//开始对内存DC进行旋转操作
	   
	for (i = (int) -0.4 * m_Bm.bmWidth; i < (int) 1.4 * m_Bm.bmWidth; i++) 
		for(j = (int) -0.4 * m_Bm.bmHeight; j < (int) 1.4 * m_Bm.bmHeight; j++)
		{
			point2.x = i;
			point2.y = j;
			point2 = CountPoint(point1, point2, angle);
			if(srcDC.GetPixel(point2) != g_stuPaintSet.tranCol)
				MemDC->StretchBlt(
				cirpoint.x + i-point1.x, cirpoint.y + j-point1.y, 
				1, 1,
				&srcDC,
				point2.x, point2.y,
				1,1,
				SRCCOPY
				);
		}		
	m_pDib->EndPaint(); 

	if (pDib)
		delete pDib;
	// 缩放窗口，以与旋转过后的图像大小相匹配
/*	int nWidth, nHeight, left, top;
	nWidth = m_pDib->GetWidth();
	nHeight = m_pDib->GetHeight();
	CPoint ptCenter = RectToParentClient().CenterPoint();
	left = ptCenter.x - nWidth / 2;
	top = ptCenter.y - nHeight / 2;

	::MoveWindow(GetSafeHwnd(), left, top, nWidth, nHeight, TRUE);
*/	
		
	return TRUE;  
}