-- title: simple particle system
-- author: pixelbath
-- desc: basic particle system, first used in Alter Ego by Kyuchumimo
-- script: lua
t=0
x=96
y=24
particles = {}
particletype = 'stars'
local starcolors = { 1, 2, 13, 15}
-- numparticles = number of particles to show
-- particletype = rain|snow|stars
function particleinit(numparticles, type)
-- initialize
particles = {}
particletype = type
for i = 0, numparticles do
table.insert(particles, {
x = math.random() * 240,
y = math.random() * 136,
lastx = 0,
lasty = 0,
color = 2,
t = 0,
vel = 0,
})
end
if particletype == 'stars' then
for i = 1, #particles do
particles[i].twinkle = math.random() > 0.49 -- randomly pick true/false
particles[i].color = starcolors[math.random(#starcolors)]
end
end
if particletype == 'rain' then
for i = 1, #particles do
particles[i].vel = math.random(3) + 1
if particles[i].vel > 2.5 then
particles[i].color = 8
end
end
end
if particletype == 'snow' then
for i = 1, #particles do
particles[i].color = 15
particles[i].vel = math.random() + 0.2
end
end
end
function particleupdate()
if particletype == 'stars' then
for i = 1,#particles do
local p = particles[i]
if not p.twinkle then goto continueTwinkle end
::continueTwinkle::
if t % 15 == 0 and math.random() > 0.1 then
p.color = starcolors[math.random(#starcolors)]
end
end
end
if particletype == 'rain' then
for i = 1,#particles do
local p = particles[i]
if p.lasty and p.lasty > 136 then
p.y = 0
p.lasty = 0
p.x = math.random() * 240
end
p.lasty = p.y
p.lastx = p.x
p.x = p.x - p.vel / 5
p.y = p.y + p.vel * 1.5
end
end
if particletype == 'snow' then
for i = 1,#particles do
local p = particles[i]
if p.y and p.y > 136 then
p.y = 0
p.lasty = 0
p.x = math.random() * 240
end
p.x = p.x - (math.random() - 0.4)
p.y = p.y + p.vel
end
end
end
function particledraw()
if (particletype == 'rain') then
for i = 1,#particles do
local p = particles[i]
line(p.x, p.y, p.lastx, p.lasty, p.color)
end
return
end
for i = 1,#particles do
local p = particles[i]
pix(p.x, p.y, p.color)
end
end
-- init here for title screen
particleinit(150, 'snow')
function TIC()
if btn(0) then y=y-1 end
if btn(1) then y=y+1 end
if btn(2) then x=x-1 end
if btn(3) then x=x+1 end
cls(13)
spr(1+t%60//30*2,x,y,14,3,0,0,2,2)
print("HELLO WORLD!",84,84)
particleupdate()
particledraw()
t=t+1
end
--
-- 001:eccccccccc888888caaaaaaaca888888cacccccccacc0ccccacc0ccccacc0ccc
-- 002:ccccceee8888cceeaaaa0cee888a0ceeccca0ccc0cca0c0c0cca0c0c0cca0c0c
-- 003:eccccccccc888888caaaaaaaca888888cacccccccacccccccacc0ccccacc0ccc
-- 004:ccccceee8888cceeaaaa0cee888a0ceeccca0cccccca0c0c0cca0c0c0cca0c0c
-- 017:cacccccccaaaaaaacaaacaaacaaaaccccaaaaaaac8888888cc000cccecccccec
-- 018:ccca00ccaaaa0ccecaaa0ceeaaaa0ceeaaaa0cee8888ccee000cceeecccceeee
-- 019:cacccccccaaaaaaacaaacaaacaaaaccccaaaaaaac8888888cc000cccecccccec
-- 020:ccca00ccaaaa0ccecaaa0ceeaaaa0ceeaaaa0cee8888ccee000cceeecccceeee
--
--
-- 000:00000000ffffffff00000000ffffffff
-- 001:0123456789abcdeffedcba9876543210
-- 002:0123456789abcdef0123456789abcdef
--
--
-- 000:000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000304000000000
--
--
-- 000:1a1c2c5d275db13e53ef7d57ffcd75a7f07038b76425717929366f3b5dc941a6f673eff7f4f4f494b0c2566c86333c57
--