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moonbus: simple base moon lander mechanics

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Dejvino 2024-08-08 16:29:16 +02:00
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pico-8 cartridge // http://www.pico-8.com
version 42
__lua__
-- MoonBus
-- by Dejvino
plr_alive=1
plr_pos={x=5,y=20}
plr_speed={x=0.5,y=0}
plr_static=false
plr_engine=-1
gravity=0.02
engine_power=0.2
function _update()
-- controlls
plr_engine=-1
if plr_alive then
if btn(⬆️) then plr_engine=⬆️ end
if btn(⬇️) then plr_engine=⬇️ end
if btn(⬅️) then plr_engine=⬅️ end
if btn(➡️) then plr_engine=➡️ end
end
-- engine
if plr_engine==⬆️ then
plr_speed.y+=engine_power
elseif plr_engine==⬅️ then
plr_speed.x-=engine_power
elseif plr_engine==➡️ then
plr_speed.x+=engine_power
end
-- move objects
move(plr_pos,plr_speed,0.1)
-- gravity pull
if not plr_static then
plr_speed.y-=gravity
end
-- crash detection
local pmaps=mget(plr_pos.x,plr_pos.y-1)
local solid=fget(pmaps,0)
if solid or plr_pos.y<=0 then
plr_speed.y*=-0.75
plr_alive=0
if (dist(plr_speed) > 1) then
sfx(0)
else
plr_speed.x=0
plr_speed.x=0
plr_static=true
end
end
camera(plr_pos.x*8-60,-56)
end
function _draw()
cls()
map()
local px,py=to_scrn(plr_pos)
local img=0
if plr_alive==0 then
img=4
elseif plr_engine==⬆️ then
img=2
elseif plr_engine==⬅️ then
img=3
elseif plr_engine==➡️ then
img=1
end
spr(img,px,py)
end
function to_scrn(p)
local x=p.x*8
local y=128-p.y*8
return x,y
end
function move(p,d,a)
p.x+=d.x*a
p.y+=d.y*a
end
function dist(p)
return abs(p.x) + abs(p.y)
end
__gfx__
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