The goal of this cart is to demonstrate a very basic platforming engine in under 100 lines of code (comments don't count), while still maintaining an organized and documented game.
It is not meant to be a demo of doing as much as possible, in as little code as possible (a la demo scene). The 100 line limit is just meant to encourage people that "Hey, you can make a game with very little coding!"
This will hopefully give new users a simple and easy to understand starting point for their own platforming games.
Note: Collision routine is based on Super Mario Bros 2 and M.C. Kids, where we use collision points rather than a box. this has some interesting bugs but if it was good enough for miyamoto, its good enough for me!
Built on a PocketC.H.I.P.!
35 comments
Hi!
To celebrate my birthday, I thought I would share something with you guys! And having recently heard (again) that most of our codes weren't very easy to read, I thought I would share some readable code !!
I might do others of these in the future if you like it! But feel free to make some of your own, I'm sure it will help the community a lot!
Here is today's subject: Balloons That Explode Into More Balloons
And here is the commented code! (click to unravel)
[hidden]
Initializing some important stuff. You could do that in more appropriate places. Call me messy, i don't care.
bloons={} -- 'balloons' is long
shkx=0
shky=0
|
You can initialize stuff in the _init function too. The difference is that here you can call functions written after this.
function _init() createbloon(64,64,32,0,8) -- if you don't have any music -- just put some sfx at -- the beginning sfx(8) end |
Call updating functions in the _update function. Don't actually update anything here, it will get messy.
function _update() updatebloons() updateshake() end |
At first, partially and randomly clearing the screen for that weird trail effect.
Then, drawing the cool stuff.
function _draw() camera(0,0) for i=0,1999 do circ(rnd(128),rnd(128),1,0) end camera(shkx,shky) drawbloons() end |
Creating one balloon object
at x,y position,
with a bigger-circle ray of r,
a moving speed of spd,
and c as color.
Angle and rotating speed 'va' are random.
Life timer 'l' is also random, but always between 0.8 and 1.2.
Then adding the balloon object to the balloon array.
function createbloon(x,y,r,spd,c)
local b={x=x,y=y,r=r,a=rnd(1),va=(flr(rnd(2))-0.5)*0.5+rnd(0.2),c=c,l=0.8+rnd(0.4)}
local aaa=rnd(1)
b.vx=spd*cos(aaa)
b.vy=spd*sin(aaa)
add(bloons,b)
end
|
Updating the balloon objects one by one.
function updatebloons()
for b in all(bloons) do
-- updating rotation 'physics'
dma=abs((b.a+0.25)%0.5-0.25)
vvv=-dma*0.005
if (b.a+0.25)%1<0.5 then
b.va+=vvv
elseif (b.a+0.25)%1>0.5 then
b.va-=vvv
end
b.a+=b.va
b.va*=0.96
-- updating position 'physics'
b.x+=b.vx
b.y+=b.vy
if(b.x-b.r<0) b.vx=2-b.vx sfx(4)
if(b.x+b.r>127) b.vx=-2-b.vx sfx(4)
if(b.y-b.r<0) b.vy=2-b.vy sfx(4)
if(b.y+b.r>127) b.vy=-2-b.vy sfx(4)
b.vx*=0.9
b.vy=0.9*b.vy+0.1*(-1)
-- updating life timer
b.l-=0.01
if b.l<0 then
-- timer is at its end...
-- *boom!*
-- creating five new balloons
-- if exploding balloon is
-- big enough
if b.r>4 then
for i=0,4 do
createbloon(b.x,b.y,b.r/4+rnd(b.r/2),8+rnd(8),8+rnd(8))
end
end
-- the 'oompf'
circfill(b.x,b.y,b.r+2,7)
addshake(b.r)
sfx(flr(rnd(4)))
-- delete exploded balloon
del(bloons,b)
end
end
end
|
Drawing the balloon objects one by one.
function drawbloons() for b in all(bloons) do -- uncomment the outline -- for sweet graphics -- and low framerate --outlined(drawbloon,7,b) drawbloon(b) end end |
Draws one balloon.
It's actually several circles, smaller and smaller, going from balloon's x,y position, along its 'a' angle.
function drawbloon(b) for i=0,7 do circfill(b.x+i*(b.r/8)*cos(b.a),b.y+i*(b.r/8)*sin(b.a),(1-(i/16))*b.r,b.c) end local rrr if b.r>10 then rrr=2 else rrr=1 end local rr=7*(b.r/8)+(1-(7/16))*b.r+rrr circfill(b.x+rr*cos(b.a),b.y+rr*sin(b.a),rrr,b.c) end |
Addshake adds a screenshake of 'p' power.
You have to call updateshake every once in a while (on _update for example) and use 'camera(shkx,shky)' before drawing stuff for the screenshake to actually work.
function addshake(p) local a=rnd(1) shkx+=p*cos(a) shky+=p*sin(a) end function updateshake() if abs(shkx)+abs(shky)<0.5 then shkx=0 shky=0 end shkx*=0.7+rnd(0.2) shky*=0.7+rnd(0.2) end |
Makes every color being drawn as the color 'c'.
Calling 'allcolorsto()' resets it.
function allcolorsto(c) if c then for i=0,15 do pal(i,c) end else for i=0,15 do pal(i,i) end end end |
Outlines in color 'c' whatever drawing function's callback is set as 'draw'. Also feeding that function with 'arg' as argument (you can also use it as 'outlined(draw,c)' if 'draw' doesn't need any argument, it will work too).
function outlined(draw,c,arg) allcolorsto(c) camera(shkx-1,shky) draw(arg) camera(shkx+1,shky) draw(arg) camera(shkx,shky-1) draw(arg) camera(shkx,shky+1) draw(arg) -- uncomment for shadow effect --camera(shkx,shky-2) --draw(arg) camera(shkx,shky) allcolorsto() end |
4 comments
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1 comment
It's just a Tic-Tac-Toe game.
Rules :
- Do a line with 3 cross/circle to win
To add later :
- AI to play against the player
- Add music/sound effect (SFX when drawing a cross/circle is pretty annoying)
5 comments
This is a TAS (Tool-Assisted Speedrun) of CELESTE. Uploaded here so you can watch it on your home PICO-8 console :)
EDIT: Doesn't seem to work on PocketCHIP for some reason...
If you'd rather just watch a video, you can see it here:
10 comments
I uploaded a test cart to the BBS but didn't make a post for it. Now the test cart shows on my user carts page, but I cannot delete it. It also says it has 8 stars somehow XD
Is there any way to delete carts from the BBS, or at least keep them from appearing on my user carts page?
Thanks
EDIT:
loll okay nevermind; now that I just posted this, I looked again and the test cart is gone. Is there some cron job that cleans up orphaned carts periodically or something? XD
0 comments
Time your speed and angle in an attempt to throw a Frisbee as far as possible. Then take control of the receiving player, and position yourself for the catch! If you do manage to catch it, quickly throw it again. Keep going until the Frisbee hits the ground, and see how far you can make it!
An update to the classic "Flying Disc" mini-game from California Games.
Update September 30th, 2016 (version 1.0):
Considering this game done! Moving out of WIP section.
Update September 18th, 2016 (version 0.4):
25 comments
hi!
this is my remake of this music: http://zxart.ee/rus/avtory/x/xpeh/sokomix/
free to any use. download here http://rgho.st/8fd2WWFxx
7 comments
Hey there!
Blob Smasher is a game we made during the BBQ Game Jam 2016, which is a 24-hour jam during which you spend more time eating grilled stuff than actually creating something.
Florian & I went with pico8 for the fun, and it's our very first experience with it and lua.
Blob Smasher is a 2-player versus game. Smash the blob to divide it and throw it at your opponent. Don't get touch by a blob while it's of the opposite color!
2 comments
Simple Voronoi diagram generator. I was trying to see if I could get a speed boost from writing pixel values directly to the video RAM, but regardless the fill walking through all the pixels is still very slow. Any ideas on how I could speed things up?
--voronoi diagram
--by hypothete
points={}
function makepoints()
for i=1,16 do
e=rnd(128)
f=rnd(128)
add(points,{
x=e,
y=f,
c=rnd(255)
})
end
end
function jitter()
for i=1,#points do
p=points[i]
p.x+=rnd(2)-1
p.y+=rnd(2)-1
end
end
function near(pts,b)
nt=nil --nearest pt
nd=4096--dist to nt
for i=1,#pts do
a=pts[i]
nl=(b.x-a.x)^2 + (b.y-a.y)^2
--dist leaving off sqrt
if(nl<nd)then
nd=nl
nt=a
end
end
return nt
end
function drawvoro()
for i=0,63 do
for j=0,127 do
k=i+64*j --x+y*w = 1d position
z={x=i*2,y=j}
np=near(points,z)
if(np) then
memset(0x6000+k,np.c,0x1)
end
end
end
end
function _init()
makepoints()
drawvoro()
end
function _update()
if(btnp(5)) then
jitter()
drawvoro()
end
end
|
9 comments
Very straightforward game thrown together in about 80-90 minutes when I realised nothing was really getting ready/finished for August's #onegameamonth.
Control a rad person as they aim to save their precious physical media from the dastardly rule of scissors.
Arrows to move, avoid scissors, collect CDs.
I actually did sound effects (limited, but present!). Quite happy with the speed/completeness of this, full disclosure though I have a basic 3-state template (update/draw for title, game, endgame) which I loaded up as boilerplate so that I could maximise the time I had.
Enjoy!
0 comments
I took some time to rewrite things so that a more deliberate architecture was in place before moving forward with more changes. I wouldn't exactly call it "clean" at this point, but it's better. I'd happily listen to feedback on architecture once I've released it.
For now, a screenshot of my first finished game in Freecell for PICO-8. Lots to do still! I'd like to strike a balance that saves button presses without turning the game too much into "autopilot." As it stands right now, it requires far too much input though.
0 comments
-- 0.5 --
- Added blinking text cursor
- 1646 tokens
-- 0.4 --
- Numbers & Symbols keyboard
- (Potentially annoying) keyboard sounds
- Weird bug fix for the PocketChip version of Pico-8
- Token count has creeped up to 1529
3 comments
This is a silly little dungeon crawler I put together to learn PICO-8. It hasn't been balanced at all and is way too difficult right now. There's also only one level; the stairs are a lie :).
TODO:
- Player buffs
- More levels
- More enemies
- Better dungeon generation
- Possibly an end condition
- High scores table
4 comments
Couple people asked about how I did sprite rotation for josefnpat's collab cart https://www.lexaloffle.com/bbs/?tid=27582
Included is a sprite rotation function, and a way of layering them on top of each other to create an illusion of a 3d sprite.
Everything is commented, hopefully it's clear.
Enjoy, hope this is helpful for someone!
(the effect isn't perfect and can be a little unclear if you don't consider it when drawing sprites, if anyone has any more accurate examples of rotation functions I'd like to see!)
6 comments
