如何使俄罗斯方块的下落刷新显得更加自然？

[xsteel]

我写了一个俄罗斯方块的程序，每次InvalidRect(rect)的时候调用OnDraw，而这时rect的刷新显得非常的明显（非常明显的闪了一下），有没有跟好的方法刷新rect，显得自然一点？

[lshadow]

用MemDC

[xsteel]

可以详细一点吗？

[jadedrip]

用DirectX 吧……

[thecct]

保存下落前的状态
计算下落后的状态
两者比较， 有变化的点重画， 没有变化的点不画

[AloneWolf]

在MemDC上绘图，再BitBlt到dc上，或包含
以下头文件，然后在OnPaint中
CPaintDC dc(this);
CMemDC pDC(&dc);
然后用此pDC画图就可以了

#ifndef _MEMDC_H_
#define _MEMDC_H_
class CMemDC : public CDC
{
private:
CBitmap m_bitmap; // Offscreen bitmap
CBitmap* m_oldBitmap; // bitmap originally found in CMemDC
CDC* m_pDC; // Saves CDC passed in constructor
CRect m_rect; // Rectangle of drawing area.
BOOL m_bMemDC; // TRUE if CDC really is a Memory DC.

public:
CMemDC(CDC* pDC) : CDC(), m_oldBitmap(NULL), m_pDC(pDC)
{
ASSERT(m_pDC != NULL); // If you asserted here, you passed in a NULL CDC.

m_bMemDC = !pDC->IsPrinting();

if(m_bMemDC)
{
// Create a Memory DC
CreateCompatibleDC(pDC);
pDC->GetClipBox(&m_rect);
m_bitmap.CreateCompatibleBitmap(pDC, m_rect.Width(), m_rect.Height());
m_oldBitmap = SelectObject(&m_bitmap);
SetWindowOrg(m_rect.left, m_rect.top);
}
else
{
// Make a copy of the relevent parts of the current DC for printing
m_bPrinting = pDC->m_bPrinting;
m_hDC = pDC->m_hDC;
m_hAttribDC = pDC->m_hAttribDC;
}
}

~CMemDC()
{
if(m_bMemDC)
{
// Copy the offscreen bitmap onto the screen.
m_pDC->BitBlt(m_rect.left, m_rect.top, m_rect.Width(), m_rect.Height(),
this, m_rect.left, m_rect.top, SRCCOPY);
//Swap back the original bitmap.
SelectObject(m_oldBitmap);
}
else
{
// All we need to do is replace the DC with an illegal value,
// this keeps us from accidently deleting the handles associated with
// the CDC that was passed to the constructor.
m_hDC = m_hAttribDC = NULL;
}
}

// Allow usage as a pointer
CMemDC* operator->() { return this; }

// Allow usage as a pointer
operator CMemDC*() { return this; }
};

#endif