🚀 go-pugleaf

In article <13DEC199204274690@vms1.iscs.nus.sg> nuscss1@vms1.iscs.nus.sg (Vax BULLET-IN-Board SysOps) writes:
>	Hi Gurus,
>
>	I have this app in which some text is positioned and printed
>	in a window using the TextOut function.  Mapping mode is the
>	default MM_TEXT. In normal VGA mode, it
>	works flawlessly. BUT, when I switch to SuperVGA with LARGE fonts,
>	the text are wrongly positioned ! However, SuperVGA with SMALL fonts
>	presents no such problem. 
>
>	I'm really puzzled at this. Does the way Windows handles coordinates
>	differ with different font sizes ? I've always thought that TextOut
>	uses the logical coordinates, and therefore, Windows should be able
>	to take care of any differences. Apparently I was mistaken.
>
>	Any advice/tips/help would be greatly appreciated.
>	Thanx. 
>
>	BTW, I've tried this out on a Paradise SuperVGA and a Taiwanese
>	Tseng Labs SuperVGA card, installed the 800x600 large font drivers,
>	and both had the same problem. 

	In MM_TEXT mode, 1 logical unit = 1 physical unit (pixel).
	If you have more pixels in a higher res card, then you
	also have more logical units.  You should use a different
	mapping mode like MM_ISOTROPIC where you can set specific
	logical co-ordinate limits which map to the physical limits.
	Use GetClientRect to get the size of the window and then map
	perhaps x=[0,1000] y=[0,1000] logical units to the physical
	no. of pixels.  I forget how to do this, but Petzold's
	"Programming Windows 3.1" shows how. I think it uses things
	like SetWindowExt, SetViewportExt,SetWindowOrg etc.  Then
	you can use logical co-ordinates [0,1000] and it will always
	come out right.
	 
-- 
John A. Grant						jagrant@emr1.emr.ca
Airborne Geophysics
Geological Survey of Canada, Ottawa