blackhole背景中方块会公转，整理代码

parts/backgrounds/blackhole.lua

@@ -1,5 +1,6 @@
 --Blackhole
 local gc=love.graphics
+local sin,cos=math.sin,math.cos
 local rnd=math.random
 local ins,rem=table.insert,table.remove
 local back={}
@@ -13,36 +14,23 @@ end
 function back.update()
 	t=t-1
 	if t==0 then
-		local size=SCR.rad*(2+rnd()*3)/100
 		local S={
-			x=(SCR.w-size)*rnd()-SCR.w/2,
-			y=(SCR.h-size)*rnd()-SCR.h/2,
 			ang=6.2832*rnd(),
+			d=SCR.rad*1.05/2,
+			rotate=6.2832*rnd(),
 			va=.05-rnd()*.1,
-			size=size,
-			texture=rnd(16),
+			size=SCR.rad*(2+rnd()*3)/100,
+			texture=SKIN.curText[rnd(16)],
 		}
-		if rnd()<.5 then
-			S.x=rnd()<.5 and
-				-SCR.w/2-S.size or
-				SCR.w/2
-		else
-			S.y=rnd()<.5 and
-				-SCR.h/2-S.size or
-				SCR.h/2
-		end
 		ins(squares,S)
-		t=rnd(6,16)
+		t=rnd(6,12)
 	end
 	for i=#squares,1,-1 do
 		local S=squares[i]
-		local ang=math.atan2(S.y,S.x)
-		local d=(S.x^2+S.y^2)^.5
-		d=d-SCR.rad/(d+60)
-		if d>0 then
-			S.x=d*math.cos(ang)
-			S.y=d*math.sin(ang)
-			S.ang=S.ang+S.va
+		S.d=S.d-SCR.rad/(S.d+60)
+		if S.d>0 then
+			S.ang=S.ang+.008
+			S.rotate=S.rotate+S.va
 		else
 			rem(squares,i)
 		end
@@ -58,11 +46,11 @@ function back.draw()
 	gc.setColor(.5,.5,.5)
 	for i=1,#squares do
 		local S=squares[i]
-		gc.draw(SKIN.curText[S.texture],S.x,S.y,S.ang,S.size*.026,nil,15,15)
+		gc.draw(S.texture,S.d*cos(S.ang),S.d*sin(S.ang),S.rotate,S.size*.026,nil,15,15)
 	end
 
 	--Blackhole
-	gc.scale(SCR.rad/1260)
+	gc.scale(SCR.rad/1600)
 	gc.setColor(0,0,0)
 	gc.circle("fill",0,0,157)
 	gc.setLineWidth(6)
@@ -70,7 +58,7 @@ function back.draw()
 		gc.setColor(0,0,0,1-i*.0666)
 		gc.circle("line",0,0,160+6*i)
 	end
-	gc.scale(1260/SCR.rad)
+	gc.scale(1600/SCR.rad)
 	gc.pop()
 end
 function back.discard()

parts/backgrounds/blockfall.lua

@@ -1,4 +1,4 @@
---Block rain
+--Large falling tetrominoes
 local gc=love.graphics
 local rnd=math.random
 local ins,rem=table.insert,table.remove
@@ -17,12 +17,12 @@ function back.update()
 		local B=BLOCKS[r][rnd(0,3)]
 		local k=(1+rnd()*2)*SCR.rad/1000
 		ins(mino,{
-			block=B,
-			texture=SKIN.curText[SETTING.skin[r]],
-			k=k,
 			x=(SCR.w)*rnd()-15*#B[1],
 			y=0,
+			k=k,
 			vy=k*2,
+			block=B,
+			texture=SKIN.curText[SETTING.skin[r]],
 		})
 	end
 	for i=#mino,1,-1 do

parts/backgrounds/blockrain.lua

@@ -21,7 +21,7 @@ function back.update()
 			x=SCR.w*rnd(),
 			y=SCR.h*-.05,
 			k=SCR.rad/100,
-			a=rnd()*6.2832,
+			ang=rnd()*6.2832,
 			vy=.5+rnd()*.4,
 			vx=rnd()*.4-.2,
 			va=rnd()*.04-.02,
@@ -34,7 +34,7 @@ function back.update()
 			rem(mino,i)
 		else
 			P.x=P.x+P.vx
-			P.a=P.a+P.va
+			P.ang=P.ang+P.va
 			P.vx=P.vx-.01+rnd()*.02
 		end
 	end
@@ -47,7 +47,7 @@ function back.draw()
 		local C=mino[i]
 		local c=C.color
 		gc.setColor(c[1],c[2],c[3],.5)
-		gc.draw(C.block,C.x,C.y,C.a,C.k,C.k,C.block:getWidth()/2,C.block:getHeight()/2)
+		gc.draw(C.block,C.x,C.y,C.ang,C.k,C.k,C.block:getWidth()/2,C.block:getHeight()/2)
 	end
 	gc.pop()
 end