Created
November 2, 2011 19:27
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Codify Particle script. Use single touch to make particles go away from you. Use double touch to attract particles.
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p={} | |
ps=800 | |
touches={} | |
total=0 | |
-- Use this function to perform your initial setup | |
function setup() | |
print("Hello World!") | |
for i=0,ps do | |
p[i]= {x=math.random(WIDTH*10)/10, | |
y=math.random(HEIGHT*10)/10, ox=0.0, oy=0.0, vx=math.random(20)-10, | |
vy=math.random(20)-10, prevX=0, prevY=0} | |
p[i].prevX=p[i].vx | |
p[i].prevY=p[i].vy | |
end | |
end | |
-- This function gets called once every frame | |
function draw() | |
--print(ElapsedTime) | |
noSmooth() | |
background(10,10,20) | |
fill(255,0,0) | |
stroke(255, 255, 255, 255) | |
strokeWidth(4) | |
--t={x=CurrentTouch.x , y=CurrentTouch.y} | |
--if t.x ~= CurrentTouch.prevX and t.y ~= CurrentTouch.prevY then | |
-- touchy(t,0) | |
--end | |
-- print(total) | |
-- for i=0,ps do | |
-- p[i].vx=p[i].prevX | |
-- p[i].vy=p[i].prevY | |
-- end | |
if total == 1 then | |
for k,touch in pairs(touches) do | |
touchy(touch,1) | |
end | |
elseif total == 2 then | |
t={} | |
i=0 | |
for k,touch in pairs(touches) do | |
--touchy(touch,1) | |
t[i]=touch | |
i = i + 1 | |
end | |
endTouch={x=(t[0].x+t[1].x)/2,y=(t[0].y+t[1].y)/2} | |
touchy(endTouch,0) | |
--elseif total==3 then | |
-- for i=0,ps do | |
-- p[i].prevX=p[i].vx | |
-- p[i].prevY=p[i].vy | |
-- p[i].vx=0 | |
-- p[i].vy=0 | |
--end | |
end | |
for k,touch in pairs(touches) do | |
-- Use the touch id as the random seed | |
math.randomseed(touch.id) | |
-- This ensures the same fill color is used for the same id | |
fill(math.random(255),math.random(255),math.random(255)) | |
-- Draw ellipse at touch position | |
ellipse(touch.x, touch.y, 100, 100) | |
end | |
for i=0,ps do | |
p[i].ox= p[i].x | |
p[i].oy= p[i].y | |
p[i].x = p[i].x + p[i].vx | |
p[i].y = p[i].y + p[i].vy | |
if p[i].x<0 then | |
p[i].x=0 | |
p[i].vx= -p[i].vx | |
end | |
if p[i].y<0 then | |
p[i].y=0 | |
p[i].vy= -p[i].vy | |
end | |
if p[i].x>WIDTH then | |
p[i].x=WIDTH | |
p[i].vx= -p[i].vx | |
end | |
if p[i].y>HEIGHT then | |
p[i].y=HEIGHT | |
p[i].vy= -p[i].vy | |
end | |
p[i].vx = p[i].vx*0.97 | |
p[i].vy = p[i].vy*0.97 | |
stroke(math.random(255),math.random(255),math.random(255),255) | |
line(p[i].ox, p[i].oy, p[i].x, p[i].y) | |
end | |
end | |
function touchy(t,g) | |
a=5 | |
for i=0,ps do | |
d= (p[i].x-t.x)*(p[i].x-t.x) + (p[i].y-t.y)*(p[i].y-t.y) | |
d= math.sqrt(d) | |
if g==0 then | |
p[i].vx = p[i].vx - a/d*(p[i].x-t.x) | |
p[i].vy = p[i].vy - a/d*(p[i].y-t.y) | |
else | |
p[i].vx = p[i].vx + a/d*(p[i].x-t.x) | |
p[i].vy = p[i].vy + a/d*(p[i].y-t.y) | |
end | |
end | |
end | |
function touched(touch) | |
if touch.state == ENDED then | |
table.remove(touches,touch.id) | |
touches[touch.id]=nil | |
if total ~= 0 then | |
total = total - 1 | |
end | |
else | |
if touches[touch.id]== nil then | |
total = total + 1 | |
end | |
touches[touch.id] = touch | |
end | |
if touch.state == BEGAN then | |
sound("jump",math.random(255)) | |
end | |
end |
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