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Forum Index : Microcontroller and PC projects : Two-Line Bouncing Ball Pico VGA
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Martin H. Guru  Joined: 04/06/2022 Location: GermanyPosts: 892 |
Good Morning, After watching the Video One-Line Bouncing Ball: Commodore 64 BASIC I just tried to run this on PicoMite VGA It runs in Mode 1. Do :D=12*A(78):E=8*A(158):Text F,G," ":Text E,D,"0":F=E:G=D:Inc T:Pause 20:Loop Function A(B):A=Abs(T-Int(T/B)*B-B/2):End Function Maybe someone can shorten it to one line  Cheers Mart!n 'no comment |
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| Volhout Guru Joined: 05/03/2018 Location: NetherlandsPosts: 3519 |
Remove the pause… or beter even, get rid of f and g Write ball, pause, erase ball Again, recalculate. As long as pause exceeds calculation time the ball will appear to be visible. Use gosub and return(shorter words) Volhout Edited 2023-05-22 16:20 by Volhout PicomiteVGA PETSCII ROBOTS |
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| Martin H. Guru Joined: 04/06/2022 Location: GermanyPosts: 892 |
You're talking in riddles, my friend  The pause is there to keep the movement smooth. Without the Pause you'll see just flashing Dots on the Screen. Gosub and Return would not do the same as the Function. and I would have to use GoSub twice... But getting rid of f and g shortes the Program to 109 Bytes  Do :D=12*A(78):E=8*A(158):Text E,D,"0":Inc T:Pause 20:Text E,D," ":Loop Function A(B):A=Abs(T-Int(T/B)*B-B/2):End Function Edited 2023-05-22 16:37 by Martin H. 'no comment |
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| JohnS Guru Joined: 18/11/2011 Location: United KingdomPosts: 3655 |
Inline the function? Does it make the line too long? John |
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| Volhout Guru Joined: 05/03/2018 Location: NetherlandsPosts: 3519 |
Hi Martin.. replace "TEXT d,e," with "?@(d,e)" Do :D=12*A(76):E=8*A(158):?@(E,D)"0":Inc T:Pause 20:?@(E,D)" ":Loop Function A(B):A=Abs(T-Int(T/B)*B-B/2):End Function 4 characters shorter again. tested at MMB4W another idea: you move in steps of 8/12 (1 char size). But always inc. or dec. Maybe you can omit the function with inlines inc. and de. where the value to inc/dec changes from +8 to -8 at boundaries, even so 12/-12... Volhout This is the idea, but 3 lines because you omit the "end if" f=12:d=20:g=8:e=d:Do:if e>620 or e<10 then f=-f if d>460 or d<10 then g=-g inc d,g:inc e,f:?@(E,D)"0":Pause 20:?@(E,D)" ":Loop Edited 2023-05-22 23:28 by Volhout PicomiteVGA PETSCII ROBOTS |
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| Volhout Guru Joined: 05/03/2018 Location: NetherlandsPosts: 3519 |
Oneliner.... Do :d=12*Abs(t Mod 78-39):e=8*Abs(t Mod 158-79):Text e,d,"0":Inc t:Pause 20:CLS :Loop Volhout edit: bouncing ball fun... Do :d=12*Abs(t Mod 78-39):e=8*Abs(t Mod 158-79):Text e,d,"0" b=12*Abs(t Mod 76-38):c=8*Abs(t Mod 156-78):Text c,b,"0":Inc t f=12*Abs(t Mod 74-37):g=8*Abs(t Mod 154-77):Text g,f,"0":Pause 25:CLS :Loop Edited 2023-05-23 06:47 by Volhout PicomiteVGA PETSCII ROBOTS |
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| Martin H. Guru Joined: 04/06/2022 Location: GermanyPosts: 892 |
 Awesome, very impressive. You actually managed to get into one line. 'no comment |
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| Volhout Guru Joined: 05/03/2018 Location: NetherlandsPosts: 3519 |
HI Martin Looking at the video I realized how much more efficient the early 8 bitters where with basic code. How much more you could put in one line of code. Shorter commands,that could be abbreviated. Separators that could be omitted. I wrote a snake program including highscore, different levels,music,even created an apple by converting a character Q(putting it upside down in the font)In 28x40 characters. On an Oric-1. In MMbasic that might not fit in 80x40… Volhout Edited 2023-05-23 16:54 by Volhout PicomiteVGA PETSCII ROBOTS |
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| Martin H. Guru Joined: 04/06/2022 Location: GermanyPosts: 892 |
The listing was more intended as a puzzle, than a real application. I found it amazing that one can do something like this with a single line of code. 'no comment |
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Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 5720 |
Now do it in seven APL characters. :) "There are three things a man must do before his time is done Write two lines of APL and make the bu&&ers run." (Devil's DP dictonary) -------- Very nice, Volhout! The old 8-bitters had the advantage of a true memory-mapped display. You could do anything with it that you could do with conventional RAM. On the old Nascom one of the tricks was to put what looked like meaningless characters on the screen then jump to the resulting code and run it. :). Have you tried putting a Q character on screen then manipulating the frame buffer contents directly? Now there's a challenge. :) Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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| Volhout Guru Joined: 05/03/2018 Location: NetherlandsPosts: 3519 |
I was still puzzling if it could be done more efficient. Different approach, but 1 character larger code... Do :x=x+a:y=y+b:a=a+(x=0)-(x=79):b=b+(y=0)-(y=38):Text 8*x,12*y,"0":Pause 20:CLS :Loop Technically the (y=38) should be (y=39) but that would bounce infinitely from corner to corner. Not very exciting. Volhout Edited 2023-05-23 18:19 by Volhout PicomiteVGA PETSCII ROBOTS |
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| Volhout Guru Joined: 05/03/2018 Location: NetherlandsPosts: 3519 |
I tried that also once, but it was a huge puzzle to write assembly code that translated into valid characters. So you could "CLS:print"abcdxyz":call address. Where address was the start of video RAM. The 6502 was not very friendly on that since everything that did something with the accumulator started with 0xAn which does not type nicely in a print statement (if I remember correctly). I think that is how they crammed chess in a ZX81 (1k). Edited 2023-05-23 18:30 by Volhout PicomiteVGA PETSCII ROBOTS |
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| Martin H. Guru Joined: 04/06/2022 Location: GermanyPosts: 892 |
that could be the next challange ;-) Full ZX81 Chess in 1K 'no comment |
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| Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 5720 |
The Nascom was interesting in its screen memory. The display was 48 characters wide (to fit a TV screen) but took up 64 characters of screen RAM on each line. The "hidden" 16 characters were 9 on the left and 7 on the right of each line. As they were subject to CLS and scrolling they were effectively lost. However, someone did manage to write a program that displayed a digital clock in one corner of the screen. It automatically repaired itself during scrolling but didn't withstand CLS. :) Another interesting thing is that the display was hardware generated with line one as the second text line, line 15 at the bottom and line 16 at the top. Lines 1-15 could be scrolled, leaving headings fixed on the top line. IIRC the video circuit wasn't far off a copy of one of Don Lancaster's Cheap Video Cookbook designs. Oh, and if you changed the character generator chip you could get a nice board for playing Sargon on an expanded Nascom. :) Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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