One-day training of MFC-Basic Drawing operations

Direct Entry focus:

I. Methods and differences for obtaining device context HDC

1. Basic Windows HDC operations

HDC _ HDC =: getdc (m_hwnd); // assume that m_hwnd is valid.

...

: Releasedc (m_hwnd, _ HDC );

2. cview-based HDC operations

HDC _ HDC = getdc ();

...

Releasedc (_ HDC );

3. CDC operations on MFC

CDC * _ CDC = getdc ();

...

Releasedc (_ CDC );

4. cclientdc operations on MFC: the constructor of cclientdc directly obtains the HDC handle; The Destructor is released, so you don't have to worry about HDC.

Cclientdc _ CCDC (m_hwnd );

...

Releasedc (_ CCDC );

5. Obtain the parent window of 4

Cclientdc _ CCDC (getparentdc ());

...

Releasedc (_ CCDC );

6. Window cwindowdc operations

Cwindowdc _ windc (This/m_hwnd/getparentdc ()/getdesktopwindow ());

...

Releasedc (_ windc );

 

Ii. Operations on paint brushes, paint brushes, and bitmap

1. Paint Brush

Cpen pen (Ps_solid, 1, RGB (255, 0, 0));

... Remember to select the device and the last logical brush.

2. Image painter

(1) normal painter

Cbrush brush (RGB (255, 0, 0 ));

....

(2) bitmap painter

Cbitmap bitmap;

Bitmap. loadbitmap (ID );

Cbrush brush (& Bitmap );

....

(3) transparent image brush

Cbrush * Brush = fromhandle (hbrush) getstockobject (null_brush ));

...