better etchasketch! ~118 characters (110 w/o clear-screen or random color)

cls() x=0 y=0 while 1 do if(btn(0)) x-=1 if(btn(1)) x+=1 if(btn(2)) y-=1 if(btn(3)) y+=1 pset(x,y,7+rnd(9)) flip() end |

random circles might be fun too :)

t=0 while true do t+=1 cls(1) for x=0,63 do for y=0,63 do pset(x*2+y%2,y*2,8+(t/16+((x-32)/(y-32)))%8) end end flip() end |

ok here's a weird version of the etchasketch that makes a fat worm thing

cls() x=0 y=0 while 1 do if(btn(0)) x-=1 if(btn(1)) x+=1 if(btn(2)) y-=1 if(btn(3)) y+=1 circ(x,y,rnd(6),7+rnd(9)) flip() end |

0 chars left.

cls() x=0y=0 while 1 do if(btn(0))x-=1 if(btn(1))x+=1 if(btn(2))y-=1 if(btn(3))y+=1 circfill(x,y,sin(time())*3+5,7+sin(time())*5) flip() end |

Alternatively:

cls() x=0y=0t=0 while 1 do t+=.03 if(btn(0))x-=1 if(btn(1))x+=1 if(btn(2))y-=1 if(btn(3))y+=1 circfill(x,y,sin(t)*3+5,7+sin(t)*5) flip() end |

whoa thats fuckin righteous :D love it! creates freaky noby noodles <3 so good

uploaded a cart of it!

im trying to shave 70 characters off of this:

p={0x00,0x50,0x05,0x56,0x65,0x66,0x76,0x77} t=0 t+=0 cls() for x=0,64 do for y=0,120 do c=p[flr((rnd(4)+4-(((x - 32)^2+(y/2 - 28)^2))/(abs((64-t%128))+192))+1)] poke((0x6000+x+(y*0x40)), c) end end flip() |

also, it seems to run only once then quit, so I might not understand how the first program in this thread works :P

edit - aaah I have to put the "while" to keep it going :P

edit edit - I also dont need to flip because im poking

flip() is being called inside a while loop to draw the backbuffer to the screen. i havent actually counted characters to see if "while 1 do /**/ flip() end" is less than the more proper "function _draw() /**/ end" - they're pretty close so probably not saving much at this point?

ok i just counted and function _draw() saves 1 character!

trust zep to do it right <3

UPDATE - if you don't have to call flip() (because poke, memset, etc) then its def less space to just do "while 1 do /**/ end"

yea im expecting a lot of rnd based screensavers for this, button input just dominates your code otherwise. i wanna try some one-button stuff tho, thats at least interactive and still leaves lots of code space...

like these programs that just go straight to the front buffer too :D LIVIN LIFE ON THE EDGE

hmmm

how close can i get to canabalt-esque runner

here's a little jumping circle hmmmm

x=-4y=0j=0 function _draw() cls() if(btnp(2))j=-10 j+=1 y+=j y=min(99,y) circfill(10,y,4,11) x-=2 if(x<-4)x=99 circfill(x,99,4,12) end |

updated to add a little obstacle hrrmmm

would be more efficient to make it run upside down haha

kind of a proto-Helicopter in 139c

x=-4y=64r=0 function _draw() cls() y+=1 if(btn(2))y-=2 circfill(10,y,3,11) x-=2 if(x<-4) then x=123r=10+rnd(108) end circfill(x,r,9,12) end |

s=-9 function _update() c1=flr(rnd(16)) if btn(4) and c1==8 then s+=1 end end function _draw() cls() print("<3",60,s,8) circ(64,64,9,c1) end |

Taking a stab at this with something super simple. When the circle and heart are the same color, press the button(4) and they come together... or just hold the button down.

This thread is absolutely lovely so I made this.

function _draw() for x=0,127 do for y=0,127 do c=pget(x-2,y-2) if c>0 then c+=flr(rnd(9)/8) pset(x+rnd(3)-1,y+rnd(3)-1,c) end end end end |

pretty cool thread

t=0 bt=1 c=0 l=127 while 1 do bt+= (btn(4) and 2 or -1) for t=1,l do c=1+(bt+t/5)%15 line(t,0,l-t,l,c) line(0,l-t,l,t,c) end flip() end |

hold <z> to reverse the rotation

135/140

Here's another:

b=0 l=99 a={7,6,5,0} function _draw() b+=.5 for t=1,l do c=flr(1+(b+t/4)%#a) p=(b+t)/30 circfill(63+4*sin(p),63+4*cos(p),l-t,a[c]) end end |

138/140

This is an awesome thread so I thought I'd join in. This is just drawing a line between points on two circles rotating at different speeds. 134/140 chars.

cls() t=0 c=1 while 1 do m=64 x=30*cos(t) y=30*sin(t) z=60*cos(1.5*t) w=60*sin(1.5*t) line(m+x,m+y,m+z,m+w,c) t+=0.00003 c+=0.0003 end |

I've been loving going through these experiments! I started fooling around with drawing circles of different sizes and colours with small random offsets and ended up with a thing that looks like a cartoon smoke trail for fireworks or something. :)

cls() x=64 y=64 c=7 s=7 function _draw() x=(x+rnd(6)-3)%128 y=(y+rnd(6)-3)%128 c=(c+rnd(2)-1)%16 s=(s+rnd(2)-1)%12 circfill(x,y,s,c) end |

136 chars

Great idea using the system logo. :)

I played around a bit to see if I could get the character count down. I had to change the look a bit, but technically you can get a similar effect in 99 chars if you use this and don't hit enter. :)

i=0 function _draw()i+=1 for a=0,6559 do poke(a+25698,pget((a+i)%64,sin((a-i)/64)+a/512)*17)end end |

If you wanna be a stickler for formatting, the prettified code is 106 chars. :)

All credit to you for the idea, though. I'm just a relentless approximating optimizer.

i=0 n=12800 m={221,210,3,0,0,151,200,0} function _draw() i+=1 if i%4==0 then a=i/4%8+1 if(btn(4))m[a]=rnd(n) memset(n,m[a],n) sfx(1) end end |

140 characters.

**WARNING, if you download this:** This code has the absolute *nerve* to go overwriting a heap of RAM that it doesn't need to, and usually makes PICO-8 unusable afterwards. If you do run it... once you've hit escape, you can blindly type "reboot" and hit enter to reset.

This one extends on the idea above where we generate SFX on the fly. This loops over an array of 8 SFX setups, on loop. If you press Z during the moment an SFX starts to play, the setup for it will be randomised. So basically you build up a whacky beat by pressing Z at appropriate moments.

That's some impressive looking optimisation!

t=0 function _draw()cls(2)t+=0.01 for k=0,16 do for n=1,9 do h=k/16+t circ(64+cos(h+t/3)*n*8,64+sin(h)*(n*n+cos(t)*16),n,11-n/3)end end end |

129/140

poke(24364,7) t=0 while 1 do x=20*cos(t) y=20*sin(t) z=50*cos(0.3*t) w=50*sin(0.3*t) line(30+x,30+y,30+z,30+w,t*2) t+=0.00003 end |

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