Advanced MFC Programming

Chapter 8. DC, Pen, Brush and Palette
The device supports 256 colors
There are 20 static colors
Color resolution is 18 bits
Horizontal size is 270 mm, 1024 pixels
Vertical size is 203 mm, 768 pixels
Summary:
1) Before drawing anything to a window, we must first obtain its device context. There are many ways of
obtaining a window’s DC (Calling function CWnd::GetDC(), declaring CClientDC or CWindowDC type
variables, etc.).
1) A client DC can be used to paint a window’s client area, and a window DC can be used to paint the
whole window (client and non-client area).
1) Pen can be used to draw line, the border of rectangle, polygon, ellipse, etc. A pen can have different
styles: solid pen, dotted pen, dashed pen, etc.
1) Brush can be used to fill the interior of rectangle, polygon, ellipse, etc. A brush can have different
patterns: solid, hatched, etc.
1) We can use an 8×8 image to create pattern brush.
1) On a palette device, there are two color approaching methods: dithering and using the nearest color.
1) Logical palette can be used to avoid color distortion. To use a logical palette, we need to create it,
select it into DC, and realize the palette.
1) System palette can be monitored by creating a logical palette whose entries are set to PC_EXPLICIT
flags.
1) Palette animation can be implemented by creating a logical palette whose entries are set to
PC_RESERVED flag.
1) The abilities of a device can be retrieved by calling function CDC::GetDeviceCaps().
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