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shmup.p8
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pico-8 cartridge // http://www.pico-8.com
version 16
__lua__
function _init()
t=0
ship = {
sp=1,
x=60,
y=100,
h=4,
p=0,
t=0,
shipx=64,
shipy=64,
shipsize=3,
shipxdir=5,
shipydir=-3,
imm=false,
box = {x1=0,y1=0,x2=7,y2=7}}
bullets = {}
enemies = {
sp=17 or 18
}
explosions = {}
stars = {}
for i=1,128 do
add(stars,{
x=rnd(128),
y=rnd(128),
s=rnd(2)+1
})
end
start()
end
function respawn()
sfx(1)
local n = flr(rnd(9))+2
for i=1,n do
local d = -1
if rnd(1)<0.5 then d=1 end
add(enemies, {
sp=enemies.sp,
m_x=i*16,
m_y=60-i*8,
d=d,
x=-32,
y=-32,
r=12,
box = {x1=0,y1=0,x2=7,y2=7}
})
end
function shipcollide()
--left
if shipx<shipsize then
shipxdir=-shipxdir
end
--right
if shipx>128-shipsize then
shipxdir=-shipxdir
end
--top
if shipy<shipsize then
shipydir=-shipydir
end
end
end
function start()
_update = update_game
_draw = draw_game
end
function game_over()
_update = update_over
_draw = draw_over
sfx(2)
end
function update_over()
end
function draw_over()
cls()
print("game over",40,50,4)
end
function abs_box(s)
local box = {}
box.x1 = s.box.x1 + s.x
box.y1 = s.box.y1 + s.y
box.x2 = s.box.x2 + s.x
box.y2 = s.box.y2 + s.y
return box
end
function coll(a,b)
local box_a = abs_box(a)
local box_b = abs_box(b)
if box_a.x1 > box_b.x2 or
box_a.y1 > box_b.y2 or
box_b.x1 > box_a.x2 or
box_b.y1 > box_a.y2 then
return false
end
return true
end
function explode(x,y)
add(explosions,{x=x,y=y,t=0})
sfx(3)
end
function fire()
local b = {
sp=4,
x=ship.x,
y=ship.y,
dx=0,
dy=-3,
box = {x1=2,y1=0,x2=5,y2=4}
}
add(bullets,b)
end
function update_game()
t=t+1
if ship.imm then
ship.t += 1
if ship.t >30 then
ship.imm = false
ship.t = 0
end
end
for st in all(stars) do
st.y += st.s
if st.y >= 128 then
st.y = 0
st.x=rnd(128)
end
end
for ex in all(explosions) do
ex.t+=1
if ex.t==13 then
del(explosions,ex)
end
end
if #enemies <= 0 then
respawn()
end
for e in all(enemies) do
e.m_y += 1.3
e.x = e.r*sin(e.d*t/200) + e.m_x
e.y = e.r*cos(t/200) + e.m_y
if coll(ship,e) and not ship.imm then
ship.imm = true
ship.h -= 1
sfx(4)
if ship.h <= 0 then
game_over()
end
end
if e.y >= 150 then
del(enemies,e)
end
end
for b in all(bullets) do
b.x+=b.dx
b.y+=b.dy
if b.x < 0 or b.x > 128 or
b.y < 0 or b.y > 128 then
del(bullets,b)
end
for e in all(enemies) do
if coll(b,e) then
del(enemies,e)
ship.p += 1
explode(e.x,e.y)
end
end
end
if(t%6<3) then
ship.sp=2
else
ship.sp=3
end
if(t%6<3) then
enemies.sp=17
else
enemies.sp=18
end
if btn(⬅️) then ship.x-=2 end
if btn(➡️) then ship.x+=2 end
if btn(⬆️) then ship.y-=2 end
if btn(⬇️) then ship.y+=2 end
if btnp(🅾️) then fire() sfx(0)
end
end
function draw_game()
cls()
for st in all(stars) do
pset(st.x,st.y,6)
end
print(ship.p,9)
if not ship.imm or t%8 < 4 then
spr(ship.sp,ship.x,ship.y)
end
for ex in all(explosions) do
circ(ex.x,ex.y,ex.t/3,8+ex.t%3)
end
for b in all(bullets) do
spr(b.sp,b.x,b.y)
end
for e in all(enemies) do
spr(e.sp,e.x,e.y)
end
for i=1,4 do
if i<=ship.h then
spr(33,80+6*i,3)
else
spr(34,80+6*i,3)
end
end
end
__gfx__
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__sfx__
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