Hires Graphics

orion70 · Post by **orion70** » Wed Dec 03, 2008 2:52 am

Done. As usual, smoother if played in Windows viewer.

Mike · Post by **Mike** » Thu Dec 04, 2008 2:02 am

Fine.

Which latitude did you use?

Michael

orion70 · Post by **orion70** » Thu Dec 04, 2008 2:32 am

30° N. Slightly north of the Tropic of Capricorn (23° N). Best angle to see Europe, Greenland, the whole Africa, Asia, and the Americas (Tierra del Fuego being few pixels out).
Not so nice view of Australia, and no Antarctica at all though.

ral-clan · Post by **ral-clan** » Thu Dec 04, 2008 6:35 am

I can see my house from here!

orion70 · Post by **orion70** » Thu Dec 04, 2008 7:01 am

Legacy · Post by **Legacy** » Mon Jan 12, 2009 9:18 pm

I wish you guys would post programs in lower case, it makes it a pain when I paste into VICE

Mike · Post by **Mike** » Mon Jan 12, 2009 10:56 pm

Hi, Legacy,

cut and paste are quite a recent addition to VICE. Short that facility being available in VICE before, there were already other tokenizers around, like Schlowski's BasEdit, which can handle upper-case letters. BasEdit produces *.prg files.

Listings without control chars, or special symbols can be transferred with a small 4-line program.

Michael

orion70 · Post by **orion70** » Tue Jan 13, 2009 2:13 am

Legacy wrote:I wish you guys would post programs in lower case, it makes it a pain when I paste into VICE

Copy and paste in M$ Word, select all, and press shift+F3. Voilà.

carlsson · Post by **carlsson** » Tue Jan 13, 2009 11:05 am

By the way, at what smaller resolution would this kind of animated globe be feasible? At 128x128 pixels each frame equals 2K if video and colour matrices are unchanged.

How long would it take to generate a frame in ML, and how many frames need to be precalculated if we want the globe to rotate at least one frame per second? Even then, the internal 4K RAM probably is best used for double buffering so we can copy graphics data into one half while displaying the other.

Legacy · Post by **Legacy** » Tue Jan 13, 2009 12:51 pm

thanks ORION * * *

Mike · Post by **Mike** » Tue Jan 13, 2009 5:53 pm

carlsson wrote:By the way, at what smaller resolution would this kind of animated globe be feasible? At 128x128 pixels each frame equals 2K if video and colour matrices are unchanged.

How long would it take to generate a frame in ML, and how many frames need to be precalculated if we want the globe to rotate at least one frame per second? Even then, the internal 4K RAM probably is best used for double buffering so we can copy graphics data into one half while displaying the other.

The following program displays the rotating Earth globe with 24 phases, in full resolution, at ~4 frames per second. It needs a fully expanded VIC-20, with RAM in BLK1, BLK2, BLK3, and BLK5.

Similarily to the first incarnation, in line 11, R1 can be adapted for different aspect ratios: R1=57 is correct for PAL; NTSC, and VICE should use R1=71, and R1=47, respectively. Line 21 contains a {PI} symbol.

Main work is done by a ultra-fast line-routine, which does ~30000 pixels per second.

Cheers,

Michael

P.S.: It is now 00:53 CET, time to go to bed.

Edit: type-in listing removed. It is contained in the MG batch suite.

carlsson · Post by **carlsson** » Wed Jan 14, 2009 1:32 am

I should've guessed you were on the task!

While I haven't tried it yet, I understand the MINI-GRAFIK program needs to be loaded. Then you seem to save (or is it load?) a file to disk. Is it a 24K memory dump of all the pre-calculated coordinates that your first program will generate?

Post by **Jeff-20** » Wed Jan 14, 2009 2:01 am

@1? @CLR?

Mike · Post by **Mike** » Wed Jan 14, 2009 3:22 am

carlsson wrote:... you seem to save (or is it load?) a file to disk.

Both. It is checked whether the file "LIN" already exists on disk, and whether it is the correct data for the aspect ratio R1 specified in line 11. If neither of these preconditions is true, then the program calculates new data for the file, which takes roughly 40 minutes. Doing that chore once is enough.

Is it a 24K memory dump of all the pre-calculated coordinates that your first program will generate?

Actually, the file "LIN" is 49 blocks in length.

Michael

orion70 · Post by **orion70** » Wed Jan 14, 2009 7:40 am

Another programming wonder

.
For the lazy ones, here's a disk with the rotating globe program (R1=47, works in fully expanded VICE emu). It's complete with the generated LIN file.

Instructions:

1) load"*",8,1
2) run
3) load"globe",8
4) run
5) Wait approx. two minutes (or press ALT+W)
6) Enjoy