15.windows Drawing (ii)

1.GDI Drawing objects-brushes

(1) function

Line color, linetype, line thickness

(2) Use

A. Creating a handle

Hpen CreatePen (int fnpenstyle,//Brush style

int nwidth,//thickness of brush

COLORREF crcolor); The color of the brush

Successful, returns the brush handle

Brush style: ps_solid-solid line, can support multiple pixel width, other linetype can only be one pixel wide

Ps_dash-Dashed line

Ps_dot-Dot Line

Ps_dashdot-a dashed line and a point alternately appear

Ps_dashdotdot-dashed and two dots alternately appear

B. Applying a brush to a DC

Hgdiobj SelectObject (HDC hdc,//drawing device handle

Hgdiobj hgdiobj); GDI drawing object handle, brush handle

Successful, returns the original GDI drawing object handle (note the brush that saved the original DC).

C. Drawing

D. Remove the brushes from the DC

Putting the original brush in the device DC with the SelectObject function will remove the brush we created.

E. Releasing brushes

BOOL DeleteObject (Hgdiobj hobject);

You can only delete brushes that are not used by the DC, so you must remove the brush from the DC before releasing it

　　　　　

15.windows Drawing (ii)