3 replies to this topic

[AJlxuMuk]

WIN32API:
I'm learning GDI programming.
What is the difference between the physical coordinate system and device coordinate system? I want to see examples, please.
Best regards.

[marwex89]

The logical coordinate system is the coordinate system of your device context. You can define your own logical coord system using functions like SetViewportOrg(), SetWindowOrg(), SetMapMode() and what not.

The device coordinate system is the coordinate system used for your device. Your screen might for example have a coordinate system of 800x600 pixles (lol) or 1680x1050 pixles. This can also be changed (change screen resolution).

I guess this is what you mean by physical coordinate system. The real physical coordinate system is however the native resolution of your screen (or printer or whatever) and can not be changed.

[AJlxuMuk]

marwex89 said:

The logical coordinate system is the coordinate system of your device context. You can define your own logical coord system using functions like SetViewportOrg(), SetWindowOrg(), SetMapMode() and what not.

The device coordinate system is the coordinate system used for your device. Your screen might for example have a coordinate system of 800x600 pixles (lol) or 1680x1050 pixles. This can also be changed (change screen resolution).

I guess this is what you mean by physical coordinate system. The real physical coordinate system is however the native resolution of your screen (or printer or whatever) and can not be changed.

Thanks, this is I needed.

[marwex89]

No problem ;)