Re: Problem with refreshing animated bitmap

On Sun, 03 Jun 2007 15:54:56 -0000, frd <simon.katanski@gmail.com>
wrote:


I've written just a simple test code, and it has neither flicker nor
other ugly graphical effect.

<CODE>
void CTestAnim2DView::OnDraw(CDC* pDC)
{
    // Double buffering with memory DC
    // http://www.codeproject.com/gdi/flickerfree.asp
    CMemDC dc(pDC);

    CRect bounds;
    GetClientRect(&bounds);

    //
    // Clear back-buffer
    //

    CBrush blueBrush( RGB(0, 0, 255) );
    CBrush * pOldBrush = dc.SelectObject( &blueBrush );

    dc.Rectangle( bounds );

    dc.SelectObject( pOldBrush );
    pOldBrush = NULL;

    //
    // Draw the bitmap
    //

    CDC bitmapDC;
    VERIFY( bitmapDC.CreateCompatibleDC( &dc ) );

    CBitmap * pOldBitmap = bitmapDC.SelectObject( &( m_sprite.Bmp ) );

    dc.BitBlt( m_sprite.X, m_sprite.Y, bounds.Width(),
               bounds.Height(), &bitmapDC, 0, 0, SRCCOPY );

    bitmapDC.SelectObject( pOldBitmap );
    pOldBitmap = NULL;
}

</CODE>

m_sprite is just an instance of a simple struct like this:

    struct Sprite
    {
        CBitmap Bmp;
        int X;
        int Y;

        Sprite()
            : X(0), Y(0)
        {
        }
    };

I have a timer and when timer ticks I update position and call
Invalidate().

MrAsm