新背景：blockrain

parts/backgrounds/blockrain.lua

@@ -0,0 +1,56 @@
+--Block rain
+local gc=love.graphics
+local rnd=math.random
+local ins,rem=table.insert,table.remove
+local back={}
+
+local t
+local cell
+function back.init()
+	t=0
+	cell={}
+end
+function back.update()
+	t=t+1
+	if t%10==0 then
+		ins(cell,{
+			bid=rnd(29),
+			x=SCR.w*rnd(),
+			y=-25,
+			a=rnd()*6.2832,
+			vy=.5+rnd()*.4,
+			vx=rnd()*.4-.2,
+			va=rnd()*.04-.02,
+		})
+	end
+	for i=#cell,1,-1 do
+		local P=cell[i]
+		P.y=P.y+P.vy
+		if P.y>SCR.h+25 then
+			rem(cell,i)
+		else
+			P.x=P.x+P.vx
+			P.a=P.a+P.va
+			P.vx=P.vx-.01+rnd()*.02
+		end
+	end
+end
+function back.draw()
+	gc.clear(.15,.15,.15)
+	gc.push("transform")
+	gc.origin()
+	local texture=TEXTURE.miniBlock
+	local minoColor=minoColor
+	for i=1,#cell do
+		local C=cell[i]
+		local tex=texture[C.bid]
+		local c=minoColor[SETTING.skin[C.bid]]
+		gc.setColor(c[1],c[2],c[3],.5)
+		gc.draw(tex,C.x,C.y,C.a,10,10,tex:getWidth()/2,tex:getHeight()/2)
+	end
+	gc.pop()
+end
+function back.discard()
+	cell=nil
+end
+return back