Draw Line?
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Draw Line?
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CobyWalker


Newbie


Joined: 03 Jul 2008
Posts: 22
Posted: 22 Aug 2008 01:14:39 pm    Post subject:
How would I draw a line?

Coordinates:
Point1=2,14
Point2=6,25

Is there a Call or do I have to make a Routine?

Thanks

Last edited by Guest on 25 Aug 2008 07:54:22 pm; edited 1 time in total
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DigiTan
Unregistered HyperCam 2


Super Elite (Last Title)


Joined: 10 Nov 2003
Posts: 4468
Posted: 22 Aug 2008 01:27:24 pm    Post subject:
Badja (maker of Lotus Turbo and Crates 3D) has a clipped linedraw routine that works along those lines. I think it was used in Shadow of the Narkemen. Or one like it.
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fourchanb


Advanced Newbie


Joined: 24 Sep 2006
Posts: 93
Posted: 22 Aug 2008 01:47:26 pm    Post subject:
There's also a romcall that does the same, but it's probably a lot slower.
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DarkerLine
ceci n'est pas une |


Super Elite (Last Title)


Joined: 04 Nov 2003
Posts: 8328
Posted: 22 Aug 2008 02:21:13 pm    Post subject:
I don't know about Badja's routine, but the one used in MirageOS doesn't work all that great for diagonal lines (the result has a hanging pixel on one end). The bcall isn't that bad if speed isn't a huge priority.
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cjgone
Aw3s0m3


Active Member


Joined: 24 May 2006
Posts: 693
Posted: 22 Aug 2008 04:08:53 pm    Post subject:
I thought Patai's Gergely was the best from the description.

http://www.ticalc.org/archives/files/fileinfo/234/23429.html


I, myself, have no idea how to draw a line without floating point numbers. :\

Last edited by Guest on 22 Aug 2008 04:11:27 pm; edited 1 time in total
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CobyWalker


Newbie


Joined: 03 Jul 2008
Posts: 22
Posted: 22 Aug 2008 05:47:55 pm    Post subject:
Sorry couldn't get either one to work.

Im using the Ti-84+ Native not Ion or MirageOs.

Also using LateNite.

Last edited by Guest on 22 Aug 2008 05:48:26 pm; edited 1 time in total
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DarkerLine
ceci n'est pas une |


Super Elite (Last Title)


Joined: 04 Nov 2003
Posts: 8328
Posted: 22 Aug 2008 06:59:46 pm    Post subject:
I suggest using the bcall in my signature unless in a speed-critical section of code, you'll save space.
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Liazon
title goes here


Bandwidth Hog


Joined: 01 Nov 2005
Posts: 2007
Posted: 22 Aug 2008 07:49:19 pm    Post subject:
Brensenham is a good read. drawing lines is more about slope, and fortunately we don't have to worry about antialiasing too much on our b/w screens ^^
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CobyWalker


Newbie


Joined: 03 Jul 2008
Posts: 22
Posted: 22 Aug 2008 08:16:55 pm    Post subject:
What Registers do I use for bcall(_DarkLine)?
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benryves


Active Member


Joined: 23 Feb 2006
Posts: 564
Posted: 22 Aug 2008 09:17:49 pm    Post subject:
TI-83 Plus System Routines is useful in these cases. Smile
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tr1p1ea


Elite


Joined: 03 Aug 2003
Posts: 870
Posted: 22 Aug 2008 10:18:32 pm    Post subject:
Since you're interested in 3D stuff, i would suggest against using the bcall.

I would use badja's clipped line routine for now:

http://www.ticalc.org/archives/files/fileinfo/191/19192.html
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CobyWalker


Newbie


Joined: 03 Jul 2008
Posts: 22
Posted: 23 Aug 2008 04:50:45 pm    Post subject:
Thanks,
but this is the same one that DigiTan posted.

How do I get this to work?

Also im not using Ion.
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luby
I want to go back to Philmont!!


Calc Guru


Joined: 23 Apr 2006
Posts: 1477
Posted: 23 Aug 2008 05:05:29 pm    Post subject:
do a #include "linedraw.inc" at the end of your program and then call the routine.
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CobyWalker


Newbie


Joined: 03 Jul 2008
Posts: 22
Posted: 23 Aug 2008 06:57:20 pm    Post subject:
I need the ionGetPixel Code.
Because, in the Asm code it says "CALL ionGetPixel"

Since im doing a native program I need this.
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lafferjm


Member


Joined: 02 Aug 2006
Posts: 169
Posted: 23 Aug 2008 10:48:55 pm    Post subject:
Don't know if it is the same as ions but there is one in the 28 days tutorial.

Link: http://dragonfire.unitedti.org/asmin28/lesson/day24.html and the routine is about half way down the page.
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Madskillz


Active Member


Joined: 02 Jan 2004
Posts: 608
Posted: 24 Aug 2008 09:06:31 pm    Post subject:
I dont know if you wanna use this but I have used the bcall(_iline)


Code:
   ld b, 0    ;x1 coord
   ld c, 62  ;y1 coord
   ld d, 94  ;x2 coord
   ld e, 62  ;y2 coord
   ld h, 1    ; 1 for dark line, 0 for light, 2 invert
   bcall(_iline)


that should draw you a line
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asdf


Advanced Newbie


Joined: 17 Aug 2008
Posts: 73
Posted: 25 Aug 2008 02:09:16 am    Post subject:
If you need any of ion's functions, just download ion, as it includes the source. Just look up the ionf.z80 file and all the routines are defined there.

ionGetPixel is:

Code:
;-----> Get pixel information
; input:   e=y coordinate
;  a=x coordinate
; output:   a holds data for pixel (e.g. %00100000)
;  hl->byte where pixel is on the gbuf
getPixel:
   ld   d,$00
   ld   h,d
   ld   l,e
   add   hl,de
   add   hl,de
   add   hl,hl
   add   hl,hl
   ld   de,gbuf
   add   hl,de
   ld   b,$00
   ld   c,a
   and   %00000111
   srl   c
   srl   c
   srl   c
   add   hl,bc
   ld   b,a
   inc   b
   ld   a,%00000001
getPixelLoop:
   rrca
   djnz   getPixelLoop
   ret
Although, feel free to use another getPixel routine (or better yet, try writing your own!) so long as its parameters match what your linedrawing routine requires.
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