Drawing with GDI +

Use GDI + Interface graphic usage GDI It is much simpler and easier to meet user needs. GDI + Provides many practical features, such as smooth lines, graphic translation, rotation, scaling, and so on.

1. UseGDI +Draw a straight line

1)Create paint brush
Pen (color (255, 0, 0, 0), 2.0f );

2)Create a graphic object

CDC * PDC = getdc ();

Graphics graphics (PDC-> m_hdc)

3)Draw a straight line

Graphics. drawline (& pen, 0, 0,100,100 );

4)ReleaseDC

Releasedc (PDC );

2. Parameter settings

1)Set paint brush Parameters

Pen (color (255, 0, 0, 0), 2.0f);

Pen. setstartcap (linecapround );//Modify the start line header type. Here is the circle header.

Pen. setendcap (linecapround );//Modify the end line header type. Here is the Arrow

Pen. setdashstyle (dashstyledot );//Modify the line format. Here is the dot line.

2)Set graphic Object Attributes

Graphics. setsmoothingmode (smoothingmodeantialias );//Anti-aliasing

3) Draw a straight line

Graphics. drawline (& pen, 10, 10,110,110 );

The preceding two steps show thatGDI +Drawing is very simple, and through simple parameters
You can easily draw the desired image.