Post by uglifruit in How's your game progressing?

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I *think* mine is going pretty good actually. I've even been working on some 'bells and whistles' (front end, and the like). It's now a case of level designing I think. It doesn't help than I am massively enjoying playing through it - which is slowing me down. Having had a few people play test - I've added instructions (as it's not self evident how to play). The level designing (which is me fiddling with Data statements) is now taking the time (and nothing like as good fun).

Happy to take feedback if anyone cares to have a go: (dropbox) Physiced

RUN (obviously) and on the menu press '1' to cheat and start at a different level. (1-11; though 11 is far too hard).

ivanb3036 years ago

Ok I'm pretty flummoxed how do you do that bouncing ball thing on the intro screen ? It's not tile based movement and there is no trail or flickering mighty impressive :)

uglifruit6 years ago

Thank you. It's an OVER 1, PLOT statement to draw and erase it.

The (horrible, uncommented) code that is doing that bit is -

66 OVER 1:LET e=48: LET f=138:LET ea=1:LET fa=2:FOR x=1 to 156:PLOT e,f:LET eo=e:LET fo=f:LET e=e+ea:LET f=f+fa:LET fa=fa-0.1
67 IF f<16 THEN LET fa=-fa*0.8:LET f=16
68 LET i$=INKEY$: if i$="" THEN PLOT eo,fo: NEXT x:GOTO 66

e,f are the co-ordinates it's PLOTted at, and in each step of the loop ea and fa are the acceleration added to e and f respectively. Each step fa is reduced (due to 'gravity).

if the height is less than 16, fa (vertical acceleration) is reversed, and reduced to 80% of it's previous value.

if nothing is pressed then the the old position of ball is erased (eo, fa) and the we loop around.

This is (essentially) the same 'physics' done in game, but with some fixed parameters.

ivanb3036 years ago

The gravity part I understand no problem (physics teacher), the trick is the OVER 1 but how do you not leave a trail on the intro screen I don't see in the code below where you erase the trail.

uglifruit6 years ago

It's my PLOT eo,fo in line 68 which is at the same co-ordinates as the PLOT e,f was a couple of lines earlier. Because of OVER 1 it's removing that pixel (OVER 1 meaning plotting is toggling the state of the pixel when it PLOTs).

P.S. Physic degree here. (High five for gravity).

ivanb3036 years ago

F=mg ftw :)

itch.io

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