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boids.p8
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boids.p8
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pico-8 cartridge // http://www.pico-8.com
version 16
__lua__
--al meetup 2019 intro tweetcart
--by stephan_gfx
d=8192z=11v=128
cls()
tgt={
{rnd()*v,rnd()*v},
{rnd()*v,rnd()*v}
}
pset(tgt[1][1],tgt[1][2],9)
pset(tgt[2][1],tgt[2][2],9)
boids={}
for i=0,v do
add(boids,{rnd()*v, rnd()*v,1,.5})
end
function dst(p1, p2)
g = {
p2[1] - p1[1],
p2[2] - p1[2]
}
return g, g[1]*g[1]+g[2]*g[2]
end
function lerp(a,b,m)
return (a-b)*(1-m) + b
end
::_::
flip()cls()
for b in all(boids) do
pset(flr(b[1]),flr(b[2]),z)
g1, d1 = dst(b, tgt[1])
g2, d2 = dst(b, tgt[2])
g = (d1 < d2 and g1 or g2)
a = atan2(g[1], g[2])
b[3] = lerp(b[3],a,0.25*(a-b[3]))
b[1] += sin(b[3])*b[4]
b[2] += cos(b[3])*b[4]
end
for t in all(tgt) do
pset(flr(t[1]),flr(t[2]),9)
end
--[[
n=0
for i=x-1,x+1 do
for j=y-1,y+1 do
l=pget(i,j)n+=l/3+z*flr(l/z)end
end
sset(x,y,(n>9or n==2or n==3)and 3or 0)end
]]--
--m(d*3,0,d)
goto _
__label__
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