1. PACER Graphics Demo Problem
I'm getting the following error when running pacer.ex. What can I do to fix
this?
C:\APPS\EUPHORIA\GRAPHICS\neil.e:2806 in procedure clear_screen()
variable SCREEN_W has not been assigned a value
... called from C:\APPS\EUPHORIA\GRAPHICS\PACER.EX:36
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2. Re: PACER Graphics Demo Problem
Hello CK,
>I'm getting the following error when running pacer.ex. What can I do to fix
>this?
>
>C:\APPS\EUPHORIA\GRAPHICS\neil.e:2806 in procedure clear_screen()
>variable SCREEN_W has not been assigned a value
>
>... called from C:\APPS\EUPHORIA\GRAPHICS\PACER.EX:36
This is because the clear_screen() routine was called before
the graphics mode was set. There are several things you can't
do until you set a graphics mode in Neil.
later,
Lewis Townsend
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3. Re: PACER Graphics Demo Problem
Thanks, Lewis...
BTW, PACER.EX is Mark Akita's program. Seems Rob can run the code
unaltered... Is that correct, Rob? If this is true, why would it break on my
machine?
I noticed in the PACER.EX code that
i1 = vesa_mode(640,480,16)
is called prior to
clear_screen()
So does vesa_mode not actually set the graphics mode?
-ck
----- Original Message -----
From: Lewis Townsend <keroltarr at HOTMAIL.COM>
To: <EUPHORIA at LISTSERV.MUOHIO.EDU>
Sent: Monday, October 02, 2000 2:33 PM
Subject: Re: PACER Graphics Demo Problem
> Hello CK,
>
> >I'm getting the following error when running pacer.ex. What can I do to
fix
> >this?
> >
> >C:\APPS\EUPHORIA\GRAPHICS\neil.e:2806 in procedure clear_screen()
> >variable SCREEN_W has not been assigned a value
> >
> >... called from C:\APPS\EUPHORIA\GRAPHICS\PACER.EX:36
>
> This is because the clear_screen() routine was called before
> the graphics mode was set. There are several things you can't
> do until you set a graphics mode in Neil.
>
> later,
> Lewis Townsend
>
> _________________________________________________________________________
> Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com.
>
> Share information about yourself, create your own public profile at
> http://profiles.msn.com.
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4. Re: PACER Graphics Demo Problem
I commented out the first "clear_screen()" in PACER.EX and then got THIS
error message:
C:\APPS\EUPHORIA\GRAPHICS\neil.e:707 in function virtual_screen()
variable bytes_per_pixel has not been assigned a value
... called from C:\APPS\EUPHORIA\GRAPHICS\PACER.EX:37
DOH!!
I'll wait to download version 2.0... 
-ck
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5. Re: PACER Graphics Demo Problem
- Posted by Robert Craig <rds at ATTCANADA.NET>
Oct 02, 2000
-
Last edited Oct 03, 2000
C.K. Lester writes:
> BTW, PACER.EX is Mark Akita's program. Seems Rob can
> run the code unaltered... Is that correct, Rob?
Yes.
> If this is true,
> why would it break on my machine?
I don't know. Maybe you picked up a different
version of Neil.e, or you are using a different version
of Euphoria, or Neil does something different on your system.
Regards,
Rob Craig
Rapid Deployment Software
http://www.RapidEuphoria.com
6. Re: PACER Graphics Demo Problem
Hello CK, Mark,
>BTW, PACER.EX is Mark Akita's program. Seems Rob can run the code
>unaltered... Is that correct, Rob? If this is true, why would it break on
>my
>machine?
>
>I noticed in the PACER.EX code that
>
> i1 = vesa_mode(640,480,16)
>
>is called prior to
>
> clear_screen()
>
>So does vesa_mode not actually set the graphics mode?
I believe vesa_mode() DOES set teh graphics mode and it also
clears the screen (at least in my experience). clear_screen()
can ONLY work AFTER a graphics mode is set. There are 3
global variables in Neil.e that must be set before you can
do ANY useful sfuff:
SCREEN_W -- screen width
SCREEN_H -- " height
Bits_Per_Pixel -- I think it's spelled this way.
I suppose you could manually set them but I wouldn't advise it.
The RIGHT way to set them is to call gfx_mode() or vesa_mode().
Any thing that uses any of these 3 vars should NOT be done
until a grphics mode is set. That's pretty much any manipulation
of graphics: clearing the screen, making a virtual screen,
blitting images, loading bitmaps, probably even drawing lines.
hope this helps,
Lewis Townsend
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