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Jmv38Jmv38 Mod
edited January 12 in Code Sharing Posts: 3,295

checking if my projects still work after moving them to a folder, i stumbled on this old ‘butterfly project’ that still work and looks pretty nice. I thought i’ll post it again for newcomers. Run the code and swipe the screen to scare the butterflies.

--# Butterflies Butterflies = class() function Butterflies:init(n) self.colorList = {} self.colorList[1] = color(253, 255, 0, 255) self.colorList[2] = color(255, 188, 0, 255) self.colorList[3] = color(255, 75, 0, 255) self.colorList[4] = color(255, 0, 157, 255) self.colorList[5] = color(252, 0, 255, 255) self.colorList[6] = color(138, 0, 255, 255) self.colorList[7] = color(0, 159, 255, 255) self.colorList[8] = color(0, 247, 255, 255) self.colorList[9] = color(0, 255, 158, 255) self.colorList[10] = color(41, 255, 0, 255) self.n = n local id = {} local ms = mesh() = id = ms rnd = math.random --[[ local rndTable = {} for i=1,3121 do rndTable[i] = rnd() end function list_iter(t) local i = 0 return function () i = i + 1; if i>3121 then i=1 end return t[i] end end rnd = list_iter(rndTable) ]] cos = math.cos sin = math.sin pi = math.pi floor = math.floor for i =1,n do local c = self.colorList [floor(rnd()*9.99)+1] local j = (i-1)*12 id[i] = Butterfly(ms,c) end end function Butterflies:draw() for i,p in ipairs( do p:draw() end end function Butterflies:touched(touch) for i,p in ipairs( do p:touched(touch) end end --# Butterfly Butterfly = class() local rnd = math.random local cos = math.cos local sin = math.sin local pi = math.pi function Butterfly:init(ms,c) local x,y,z,w,h,o,r,j local xc,yc = WIDTH/2,HEIGHT/2 local shape = {} x = (rnd()-0.5)*WIDTH*0.9 + xc y = (rnd()-0.5)*HEIGHT*0.9 + yc z = 0 w = (rnd()+2)*4 h = w o = 1 -- this is the opening of the wings r = rnd()*2*math.pi j = #ms.vertices ms:addRect(x,y,w,h,r) ms:addRect(x,y,w,h,r) = ms local p =self p.j, p.shape, p.r, p.c, p.w, p.h, p.o, p.x, p.y = j,shape,r,c,w,h,o,x,y p.dtBeat= 0.5 p.tfBeat= 0 self:redraw() end function Butterfly:redraw() local p= self local j,shape,r,c0,w,h,o,x,y = p.j, p.shape, p.r, p.c, p.w, p.h, p.o, p.x, p.y local ms = shape[1]=vec2(0,0):rotate(r) shape[2]=vec2(w*o*1.3,h):rotate(r) shape[3]=vec2(w*o/2,-h):rotate(r) shape[4]=vec2(0,0):rotate(r) shape[5]=vec2(-w*o*1.3,h):rotate(r) shape[6]=vec2(-w*o/2,-h):rotate(r) c = color(0,0,0,128) local d,s if self.flying then d=10 s=1.1 else d=4 s=1 end for k=1,6 do ms:vertex(j+k,shape[k]*s+vec2(x+d,y-d)) ms:color(j+k,c) end for k=1,6 do ms:vertex(j+k+6,shape[k]*s+vec2(x,y)) ms:color(j+k+6,c0) end end function Butterfly:draw() local limit = DeltaTime/0.016 if rnd()<=limit/500 then self:turn() end if rnd()<=limit/500 then self:wingBeat(rnd()*0.7+0.3) end if rnd()<=limit/10000 then self:fly("random") end self:wingBeat() if self.flying then self:fly() end end function Butterfly:wingBeat(dt) --if true then return 0 end local pap = self if dt then -- this is a start pap.dtBeat= dt pap.tfBeat = ElapsedTime + dt -- sound(SOUND_HIT, 39771) else -- continue beating if pap.tfBeat > ElapsedTime then local o = (1.5+ cos((ElapsedTime - pap.tfBeat)/pap.dtBeat*2*pi))/2.5 pap.o = o self:redraw() end end end function Butterfly:turn() local pap = self local r = (rnd()-0.5)*pi/2 pap.r = pap.r + r if self.flying then self.flySpeed = (rnd() + 1)*70 end self:redraw() end function Butterfly:fly(type,t,mult) local alpha if type then self.flying = true self.flyType = type if self.flyType == "random" then self.flySpeed = (rnd() + 1)*70 if mult then self.flySpeed = self.flySpeed * mult end if t then alpha = (rnd() -0.5)*pi local v = vec2(self.x-t.x,self.y-t.y)+vec2(cos(alpha),sin(alpha)) self.r = vec2(0,0):angleBetween(v) - pi/2 end alpha = self.r + pi/2 self.flyDir = vec2(cos(alpha),sin(alpha)) end else if self.tfBeat<ElapsedTime then self:wingBeat(rnd()*0.3+0.2) end if self.flyType == "random" then if rnd(30)==1 then self:turn() alpha = self.r + pi/2 self.flyDir = vec2(cos(alpha),sin(alpha)) end local limit = DeltaTime/0.016 if rnd()<limit/300 then self.flying=false end end if self.x <0 then self.x = self.x + WIDTH end if self.x >WIDTH then self.x = self.x - WIDTH end if self.y<0 then self.y = self.y + HEIGHT end if self.y>HEIGHT then self.y = self.y - HEIGHT end local dir,speed = self.flyDir,self.flySpeed self.x = self.x + dir.x * speed * DeltaTime self.y = self.y + dir.y * speed * DeltaTime self:redraw() end end function Butterfly:touched(touch) if vec2(touch.x,touch.y):dist(vec2(self.x,self.y))<80 then self:fly("random",touch,2) end end --# Main -- 0 papillon displayMode(FULLSCREEN) -- Use this function to perform your initial setup function setup() papillons = Butterflies(300) end -- This function gets called once every frame function draw() -- This sets a dark background color background(68, 68, 68, 255) papillons:draw() end function touched(touch) papillons:touched(touch) end
image.jpeg 78.1K


  • dave1707dave1707 Mod
    Posts: 7,388

    @Jmv38 That’s a really neat demo. I don’t remember seeing it before. I had to comment several lines before it would run. Those lines contained autoGist and fps.

  • Jmv38Jmv38 Mod
    Posts: 3,295

    @dave1707 thank for warning! i removed the unecessary lines from the code above, it should now run properly.
    I posted this project a very long time ago, maybe you were not around yet...

  • dave1707dave1707 Mod
    Posts: 7,388

    @Jmv38 Your butterfly code was posted in Aug 2014 and I even made a comment in the discussion where you posted it. I guess my memory isn’t what it used to be. As for my time here, I joined 3 months before you did.

  • Jmv38Jmv38 Mod
    Posts: 3,295

    Jmv38 and dave1707: :-D

  • dave1707dave1707 Mod
    Posts: 7,388

    @Jmv38 That looks about right, but I have more hair that that.

  • pacpac
    Posts: 140

    By the way if you have a cat you should try this. I put my iPad on the floor next to my cat with your program running and ran my finger across the screen and they he started playing with it.

    You made the next big Cat Game.

    Good job

  • Posts: 1,134

    @Jmv38 - nice little demo, try removing the background() command - nice effect. Also put up a tree background image to add a little extra to the scene. Thanks.

  • SimeonSimeon Admin Mod
    Posts: 4,804

    @Jmv38 I really like this demo as well, had it sitting on my iPad on my desk yesterday and would just occasionally play around with it.

  • Posts: 160

    @Jmv38 Very nice project. I changed the colour palette and removed background() to generate this lovely art

    image.jpeg 315.5K
  • Jmv38Jmv38 Mod
    Posts: 3,295

    @Kolosso very nice indeed! good job.

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