新增灯笼背景

parts/backgrounds/lanterns.lua

@@ -0,0 +1,49 @@
+--Cool liquid background
+local gc=love.graphics
+local int,rnd=math.floor,math.random
+local ins,rem=table.insert,table.remove
+local back={}
+local lanterns
+local t
+
+function back.init()
+	lanterns={}
+	t=0
+end
+function back.update(dt)
+	t=t-dt
+	local H=SCR.h
+	if t<=0 then
+		local size=SCR.rad*(2+rnd()*3)/5/2000
+		local L={
+			x=SCR.w*rnd(),
+			y=H*1.05,
+			vy=size*2,
+			size=size,
+			phase=rnd(),
+			vp=.02+.02*rnd(),
+		}
+		ins(lanterns,L)
+		t=rnd(.626,1.626)
+	end
+	for i=#lanterns,1,-1 do
+		local L=lanterns[i]
+		L.y=L.y-L.vy*dt*60
+		L.phase=(L.phase+L.vp*dt*60)%1
+		if L.y<.05*H then
+			rem(lanterns,i)
+		end
+	end
+end
+function back.draw()
+	gc.clear(.1,.1,.1)
+	gc.push("transform")
+	gc.origin()
+	gc.setColor(1,1,1)
+	for i=1,#lanterns do
+		local L=lanterns[i]
+		mDraw(IMG.lanterns[int(L.phase*6)+1],L.x,L.y,nil,L.size)
+	end
+	gc.pop()
+end
+return back