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Forum Index : Microcontroller and PC projects : COBO - New Puzzle Game
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vegipete Guru  Joined: 29/01/2013 Location: CanadaPosts: 1109 |
Greetings fellow Maximiters (or perhaps Mighty Maxxers?) I've been writing a new game for the colour Maximite. This game is a shameless copy of an un-named game available for smart phones and play-able online. 2013-04-04_222918_COBO.zip Instructions are in the included help file, which I have copied below. Basically, you must knock all but one ball from the playing field by launching the balls into each other. The puzzle is determining which balls to hit others with in which order. Included are 52 levels, all of which are solve-able. The first few are simple, but the challenge increases. In due course, I'll make more levels. And accept level submissions from others. ;-) I've written this for the colour Maximite. I have no idea how (or even if) it works on a regular Maximite. Have fun and, as always, feedback, bug reports, etc are appreciated. Pete. ps: Also, in the process of writing this game, I may have stumbled upon a bug lurking in the handling of FOR-NEXT loops. I say may have because I can't isolate the bug and my coding may be asking too much of the interpreter. The seeming bug is that program flow changes depending on whether the loop variable is specifically called out in the NEXT statement at the end of a FOR-NEXT loop. Line 290 of COBO03.BAS is the statement in question. If the 'n' is not included, the program doesn't work correctly - the FOR-NEXT loop doesn't actually happen. (This appeared in earlier development versions. I haven't actually checked if COBO03.BAS still requires the 'n'.) If you feel like experimenting, comment out the 'n' and see if you can detect a change in program operation. (Under certain conditions, balls can pass right through other balls instead of hitting them.) =================================== COBO - Can Only Be One Written by VegiPete for the Colour Maximite computer. Knock the balls off the playing field until only one remains. The balls can only travel horizontally or vertically. Once moving, they will continue until they leave the field or hit another ball. The struck ball will continue moving in the same direction. A ball needs at least one space in the desired direction of travel to start moving. Balls cannot be launched directly from the playing field. They must hit another ball, or chain of balls. A level is solved when only one ball remains. Keys: z/Z - undo one move for each press r/R - restart level 0-9 - select ball arrow keys - launch selected ball in desired direction ESC - quit game l/L - enter level code When each level is solved, a level code is displayed. Use this code to jump directly to the next level. Have fun! Visit Vegipete's *Mite Library for cool programs. |
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TassyJim Guru Joined: 07/08/2011 Location: AustraliaPosts: 6099 |
Not tested yet but I don't think it's a good idea to 'exit function' from within a for next loop. Better to 'exit for' Function notempty(x,y)
Local n notempty = 0 If x<0 Or x>xsize-1 Or y<0 Or y>ysize-1 Then notempty = -1 : Exit Function For n = 1 To maxballs If curlevel(stepnum,n) = x + y/100 Then notempty = n : Exit For 'there's a ball in this spot EndIf Next n 'MUST SPECIFY VARIABLE HERE. WHY? BUG? End Function (I usually put the variable in the next line anyway) Jim VK7JH MMedit MMBasic Help |
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| vegipete Guru Joined: 29/01/2013 Location: CanadaPosts: 1109 |
I just did some testing and the 'bug' can be seen in COBO03.BAS also. If you change line 290 to Next 'n 'MUST SPECIFY VARIABLE HERE. WHY? BUG? (add an apostrophe in front of the n variable so it becomes a comment) then the peculiar behaviour can be seen on level 19.
(Use level code 11411611 to go straight to level 19) Without the 'n' after the NEXT, move 5 left, then 5 down. Now move 9 left and watch what happens. If you move 9 left again, everything works again. If you make an illegal move before 9 left, it works correctly. Thanks for your thoughts, Jim. Your suggestion works. In fact, the early loop exit isn't even needed, although it allows the subroutine to finish faster. But there is still some sort of weird FOR-NEXT behaviour, perhaps related to 'unfriendly' use of the EXIT command. Visit Vegipete's *Mite Library for cool programs. |
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