Davi_dash [Lexaloffle Blog Feed]

collision

Fri, 23 Feb 2024 18:27:16 UTC

function box(_x,_y,_w,_h)
 return{
 x=_x,
 y=_y,
 w=_w,
 h=_h
 }
end

function get_cols(a)
 local gx,gy=flr(a.x/8),flr(a.y/8)
 local ex,ey=flr((a.x+a.w-1)/8),flr((a.y+a.h-1)/8)

 local list={}
 for i=gx-1,ex+1 do
  for ii=gy-1,ey+1 do
   if fget(mget(i,ii),0) then
    add(list,box(i*8,ii*8,8,8))
   end
  end
 end

 return list
end

function collide(a,_dx,_dy,list,side)

 local ca={
  x=flr(a.x),
  y=flr(a.y),
  w=a.w,
  h=a.h
 }

 for i=1,#list do
  local v=list[i]

  if col(v,ca) then
   if _dx>0 then
    a.x=v.x-a.w
    side["right"]=true
   elseif _dx<0 then
    a.x=v.x+v.w
    side["left"]=true
   end

   if _dy>0 then
    a.y=v.y-a.h
    side["down"]=true
   elseif _dy<0 then
    a.y=v.y+v.h
    side["up"]=true
   end

  end

 end

end

--diss code expects that "a" have a
--dx and dy 

function move(a)

 local sides={
  ["left"]=false,
  ["right"]=false,
  ["up"]=false,
  ["down"]=false
 }
 local l=get_cols(a)

 a.x+=a.dx
 collide(a,a.dx,0,l,sides)
 a.y+=a.dy
 collide(a,0,a.dy,l,sides)

 if sides["up"] or sides["down"] then
  a.dy=0
 end 

 if sides["left"] or sides["right"] then
  a.dx=0
 end 

 return sides
end

function col(a,b)
 return not(
 (a.x>b.x+b.w-1)or
 (b.x>a.x+a.w-1)or
 (a.y>b.y+b.h-1)or
 (b.y>a.y+a.h-1)
 )
end

this is the code that i use for collisions with the map
is not perfect but it works

hehe

the code is based in the pygame way of doing collisions
probably not the best way of doing collisions in pico-8

but it works for me atleast

the way to use this, is to just call the move function
in a table that have dx and dy

dx="direction in the x-axis"
dy="direction in the y-axis"

and update dx and dy

i not a pico-8 expert so, i probably using a lot of tokens

star_addicted_full

Sat, 25 Nov 2023 21:58:18 UTC

star_addicted_full

by Davi_dash

[Click to Play]

star_addicted

star addicted is fast passed 2d platformer

you collect star to calm you down, you have a dash abilitty to go faster.
you can also get a keys over time to travel faster using doors

have fun.

raymaster

Wed, 22 Nov 2023 21:11:28 UTC

raymaster

by Davi_dash

[Click to Play]

Casting a ray

a basic line_cast algorithm

proximity_line_VFX

Sun, 03 Sep 2023 20:53:23 UTC

hohpojido

by Davi_dash

[Click to Play]

i dont know i just like to do some cool Visual carts, i guess... enjoy

birthdayyay

Thu, 24 Aug 2023 22:28:56 UTC

birthdayyay

by Davi_dash

[Click to Play]

its my birthday yay.

cube_3d_demo

Sun, 09 Jul 2023 16:14:30 UTC

sifepubaru

by Davi_dash

[Click to Play]

3d_thing

i been kinda busy , but still trying some game_dev_stuff, diss is a spining cube , using real 3d , i think is neat ,
i been also making a game in godot , a fun engine , more updates in that later.

enjoy the funny 3d shape

cdcoolthing

Sat, 26 Nov 2022 20:21:03 UTC

cdcoolthing

by Davi_dash

[Click to Play]

third_person_camera

i want to make a 3d game in pico8, but i without time to spend in gamedev ,with the time i have left i doing some camera work , diss a tps style camera(i have to charge some variables to accommodate to the pico8 128x128 screen) , i hope you all can find a good use to it , i also want to thanks the help i got from freds72 (the guy who ported doom to pico8), and again i using sokpop sorce code as reference.

3d_menu_demo

Sat, 01 Oct 2022 13:03:12 UTC

risodisosi

by Davi_dash

[Click to Play]

This is something a code a long time ago, is a basic 3d menu , the only time i saw a menu like diss was in sonic adveture, and i think a sony console had some menu like diss , but i not so sure , well i hope some one can find good use of diss.

Mouse_space

Wed, 20 Jul 2022 12:41:33 UTC

mouse_in_world_space

How do you get the mouse x and y based on world space ?

kindaLike

Tue, 12 Jul 2022 14:29:12 UTC

kindaLike

by Davi_dash

[Click to Play]

i saw that pico8 got a free version so i decide to make a small game

i kinda new in to developing games ,and that why the game is so simple , or maybe is because pico8 token count said he hates me,
who knows.

about the game he is kinda_like a rougue like , he very inspired in the binding of issac, but simpler
every door do something

yellow

is the item room

pink one

is a mystery can have enemies or good_stuff

the brown one

is just a enemy room

the controls are the keybord keys and z and x
z are shot
x use card

diss game is not that good , is very short and you can see that, is more like train to flex my programing skils that anything .
btw the code is pretty bad , have fun :)