TI-68k picture editor

[DarkerLine]

I'm currently writing a picture editor in TI-Basic for the 68k calculators (while I'm aware there's several such editors on ticalc.org alone, there were none that satisfied my purposes). It's primarily for personal use, but I might release it to the public if it's useful to other people too. For this purpose, I'd be willing to add not-too-complicated features if necessary.

Currently, the picture editor features the following:

• Edit pictures in a zoomed-in view with a small 'preview' image
  
• The maximum size is 23x36 on a TI-89, 32x42 on a widescreen calculator (though it's mostly meant for small, 8x8 or 16x16 images)
  
• Import and export in PIC format or as a matrix for the NewPic command.
  
• Shows the memory taken up by either format.
  
• Compatible with all calculators TI-89 through Voyage 200.
  

Any questions, comments, or other feedback?

[Weregoose]

Translation is a must. Someone may also want to overlay an imported image with the current one, and then AND/NOT/XOR could follow as bonus options.

[DarkerLine]

I added translation (okay, so far only in one direction, but the rest is a matter of typing more). A while ago I'd thought of a nice method to scroll the screen by storing and recalling pictures, and I was glad to see it worked like a charm.

[Liazon]

horizontal/vertical flip?

[simonzack]

That made me think of... rotation?

[DarkerLine]

Those are nice, but I don't expect them to be fast routines when implemented...

[simonzack]

there might be some libs, though there might not be any. I'm not quite familiar with basic... maybe you can still implement a rotation method in asm, and use it in basic

[DarkerLine]

I'd like to mention that a rotation algorithm is not the simplest thing to code even in assembly. I could do it on a TI-83 series calculator, but all I know about 68k assembly is "move".

[cjgone]

Why 68k assembly (which is really impossible)? Use TIGCC

[DarkerLine]

Hey, I don't tell you what to program in (even though writing in C for the TI-83 series calculators is a really bad idea). This project is mostly meant for me to get reacquainted with TI-Basic on the 68k calcs, so it wouldn't be all that great an idea for me to do it in C.

[Liazon]

well it doesn't have to be fast does it? or is speed part of your getting reacquainted w/ 68k basic?

[DarkerLine]

[Art_of_camelot]

Horizontal and vertical flip should be fairly fast, dunno about rotation though. Grayscale pic editing would be a nice feature to see.

[bananaman]

horizontal/vertical flip and rotation all require you to move every single pixel so I don't really see a major difference in time for the either of them. I'm not sure about the speed of the 89, but if you tried moving all 36*36 items on a 83 it would take awhile.

[DarkerLine]

[bananaman]

I am guessing then that you can create a pic variable of any size on the 89?

If so, then you can swap whole rows and columns at once.

[Liazon]

ya, that's one of the nice things of 68k basic. iirc, recalling pics is almost as good as having a sprite routine.

[DarkerLine]

And if you're familiar with sprite routines, you can intuit some of the undocumented 'features' of recalling pictures. Such as the 50% slowdown when the picture is unaligned.

[Liazon]

lol true, but it's not like on an 83+ where you need something like xlib to recall a partial pic, it already comes w/ the calc software.

edit:
although iirc, I remember you did mention there was an xlib equivalent for 68k.

[Art_of_camelot]