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Re: Getting info on the whole screen in IDL [message #3582 is a reply to message #3573]

Sun, 19 February 1995 18:15

landsman
Messages: 93
Registered: August 1991

Member

In article <17FEB199512365904@sorbet.gsfc.nasa.gov>,
landsman@sorbet.gsfc.nasa.gov (Wayne Landsman (301)-286-3625) writes...
> The GET_SCREEN_SIZE keyword to the DEVICE command under X windows will give
> you the size of the entire screen in pixels. I think you still have to link
> to the C program to get the size in mm.
>

David Fanning of RSI pointed out that the !D.X_PX_CM and !D.Y_PX_CM system
variables can be used to convert the screen size to mm. Below I give
a simple program XPIXELS to return the screen size.

I note that the !D system variable contains information applicable
to all graphics devices, while the total screen size is a concept that only
makes sense for devices that support windows. I suppose this is why the
screen size information is not in the !D system variable, but must be
accessed through the DEVICE command.

--Wayne Landsman landsman@stars.gsfc.nasa.gov

pro xpixels,xpix,ypix,xmm,ymm

;Return the screen size in pixels (xpix,ypix) and mm (xmm,ymm)
;Works on devices that support windows ('X','WIN','MacOS')

device,get_screen_size = scrsz
xpix = scrsz(0) & ypix = scrsz(1)
xmm = 10.*xpix/!D.X_PX_CM
ymm = 10.*ypix/!D.Y_PX_CM

return
end

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[Message index]

		Re: Getting info on the whole screen in IDL By: sjt on Tue, 21 February 1995 01:45
		Re: Getting info on the whole screen in IDL By: landsman on Sun, 19 February 1995 18:15
		Re: Getting info on the whole screen in IDL By: landsman on Fri, 17 February 1995 09:36

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