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Calculator Community => TI Calculators => TI-BASIC => Topic started by: {AP} on February 13, 2009, 12:47:16 pm

Title: Celtic III Spriting with Hex Code
Post by: {AP} on February 13, 2009, 12:47:16 pm

Updated multiple times due to unexpected problems.
Everything works fine in this version.
I apologize for anyone who may have been following the old version. (it won't crash your calc or anything, just look weird)

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Here's a quick "Spriting with Hex Code" tutorial.

Hex code is just a series of numbers and letters 0-9 and A-F.
Each digit is responsible for 4 pixels.

Code: [Select]

X = on (black)
. = off (white)

0 - ....
1 - ...X
2 - ..X.
3 - ..XX
4 - .X..
5 - .X.X
6 - .XX.
7 - .XXX
8 - X...
9 - X..X
A - X.X.
B - X.XX
C - XX..
D - XX.X
E - XXX.
F - XXXX
Here's an example of an S sprite.
In full it's "007C82807C02827C". (look at the digits in the parentheses on the side in order)

Code: [Select]

0 -> . . . . | . . . .    <- 0  (00)
7 -> . X X X | X X . .    <- C  (7C)
8 -> X . . . | . . X .    <- 2  (82)
8 -> X . . . | . . . .    <- 0  (80)
7 -> . X X X | X X . .    <- C  (7C)
0 -> . . . . | . . X .    <- 2  (02)
8 -> X . . . | . . X .    <- 2  (82)
7 -> . X X X | X X . .    <- C  (7C)
Any questions, just ask.

Title: Re: Celtic III Spriting with Hex Code
Post by: boot2490 on September 17, 2011, 03:05:14 pm

So if it is just a string, ("007C82807C02827C") how does it know to make a square image? Lets say I wanted to make a 94 by 62 image like that. How would I? How do you tell it how to form the image?

Title: Re: Celtic III Spriting with Hex Code
Post by: Geekboy1011 on September 17, 2011, 03:14:00 pm

HOly necro post

Basically Celtic3 takes the hex value and uses it with a asm sprite routine. the way it reads the string its stored like a actual data for a sprite in memory.


and for that consult the celtic 3 read me its all listed in there ^_^ (i dont have a copy handy sorry :/)

Title: Re: Celtic III Spriting with Hex Code
Post by: Xeda112358 on September 17, 2011, 03:26:25 pm

Hehe, nice :) Okay, so I am assuming this is for the identity(5 command? If so, you will need to know how to convert binary to hex which isn't too difficult. Each hex digit is 4 bits or pixels. So for the byte on the screen 01111110, we get  the first pixel off followed by 6 pixels on and then a pixel off. Convert this to hex and you have "7E" as a more compressed form :) However, if you want an easier. If you want to make a sprite that is two bytes wide and 3 pixels tall:

01111111 11111110   = 7F FE
10000000 00000001   = 80 01
01111111 11111110   = 7F FE

So we would use the code "7FFE80017FFE" for the picture :) You can likewise apply this to wider and taller sprites, however for a sprite that large, it is better to just use a picture. You can use the xLIB functions of Celtic 3 to make hacked pictures (I think they are real(3 and real(9)

I hope this helps?

EDIT: I used to code a lot with Celtic 3, so I know I have the readme somewhere on my computer. Hopefully next time I will be able to give a better answer :)