48 lines
1.0 KiB
Lua
48 lines
1.0 KiB
Lua
-- A lantern background which is full of festive atmosphere. Lantern image by ScF
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local floor,rnd=math.floor,math.random
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local ins,rem=table.insert,table.remove
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local mDraw=mDraw
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local back={}
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local lanterns
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local t
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function back.init()
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lanterns={}
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t=0
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end
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function back.update(dt)
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t=t-dt
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local H=SCR.h
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if t<=0 then
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local size=SCR.rad*(2+rnd()*3)/5/2000
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local L={
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x=SCR.w*rnd(),
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y=H*1.1,
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vy=size*2,
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size=size,
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phase=rnd(),
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vp=(.02+.02*rnd())*(rnd(2)*2-3),
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}
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ins(lanterns,L)
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t=rnd(.626,1.626)
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end
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for i=#lanterns,1,-1 do
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local L=lanterns[i]
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L.y=L.y-L.vy*dt*60
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L.phase=(L.phase+L.vp*dt*60)%1
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if L.y<-.1*H then
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rem(lanterns,i)
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end
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end
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end
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function back.draw()
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GC.clear(.08,.08,.084)
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GC.setColor(1,1,1,.2)
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local img=IMG.lanterns
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for i=1,#lanterns do
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local L=lanterns[i]
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mDraw(img[floor(L.phase*6)+1],L.x,L.y,nil,L.size)
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end
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end
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return back
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