MaxCoderz

I know that you can use bios calls to draw lines to the screen. However, I need to draw lines in an asm prigram running greyscale, so I really don't need to draw to the screen, but the graph buffers. (possibly twice to achieve black rather than grey. Is there an easy way to do this?

If I will end up needing to code something, the line gets to be either horizontal or vertical, but still needs to have edges. (Not like the basic versions of these commands. <shudder>)

Thanks!

-gamefreak

Needs edges? What do you mean? Like doesn't continue all the way across the screen?

like using a bitmask to avoid having to extend a line to fill a byte?

There are a few good line drawing routines on ticalc.org. There is a really nice one by CoBB which can be found here: http://www.ticalc.org/archives/files/fi ... 23429.html

Although I'm sure a routine that just handles horizontal/vertical routines could be quicker and smaller. Also, I believe CoBB's is designed for speed, so if speed isn't a necessity you could opt for a routine that's smaller but slower.

Well you can set a system flag that will make TIOS line romcalls to draw to the buffer instead of the screen. I think the flag is bufferOnly, (IY + plotFlag3).

Actually, Jim e has a faster version, which is however somewhat bigger. I think mine is nearly as compact as you can get besides having a decent speed, so it's rather optimised for size in my opinion.

I know Jim e's is faster, but you already mentioned that his method was the only way it could be faster ... but at the size expense, i dont think its worth it.

Hmm... I'm liking this flag idea. I also had a minor thought that may or may not work. I noticed that the greyscale package sort of "ghosts" anything on-screen, but that it goes away if you clear the buffers. Do you suppose that just using the bios calls normally on a white background would produce the effect?

I want to try this buffer idea out though. I see the flag, but how do you tell it what buffer to draw to? I would need to do the draw twice, one for each buffer. Also, can this be applied to text as well?

-gamefreak

The new grayscale package is completely flickerless.

You must remember that even the quality of RGP is still calc specific. It may be flickerless on your calc, but not on someone elses.

tr1p1ea wrote:There are a few good line drawing routines on ticalc.org. There is a really nice one by CoBB which can be found here: http://www.ticalc.org/archives/files/fi ... 23429.html

This is the one I use...