背景系统增加“默认背景”功能，新增节日飘雪背景

Zframework/background.lua

@@ -7,6 +7,7 @@ local BGlist={
 }
 local BG={
 	cur="none",
+	defaultBG="none",
 	init=false,
 	resize=false,
 	update=NULL,
@@ -23,7 +24,13 @@ function BG.send(...)
 		BG.event(...)
 	end
 end
+function BG.setDefaultBG(bg)
+	defaultBG=bg
+end
 function BG.set(background)
+	if not background then
+		background=defaultBG
+	end
 	if background==BG.cur or not SETTING.bg then return end
 	BG.discard()
 	BG.cur=background

main.lua

@@ -375,4 +375,6 @@ do
 		S.version=VERSION_CODE
 		FILE.save(STAT,"conf/data")
 	end
-end
+end
+
+BG.setDefaultBG(FESTIVAL=="Xmas"and"snow"or"space")

parts/backgrounds/snow.lua

@@ -0,0 +1,54 @@
+--Snow
+local gc=love.graphics
+local rnd=math.random
+local max,min=math.max,math.min
+local ins,rem=table.insert,table.remove
+local back={}
+
+local t
+local snow
+function back.init()
+	t=0
+	snow={}
+	BG.resize()
+end
+function back.update()
+	t=t+1
+	if t%(t%626>260 and 3 or 6)==0 then
+		ins(snow,{
+			x=SCR.w*rnd(),
+			y=0,
+			vy=1+rnd()*.6,
+			vx=rnd()*2-.5,
+			rx=2+rnd()*2,
+			ry=2+rnd()*2,
+		})
+	end
+	for i=#snow,1,-1 do
+		local P=snow[i]
+		P.y=P.y+P.vy
+		if P.y>SCR.h then
+			rem(snow,i)
+		else
+			P.x=P.x+P.vx
+			P.vx=P.vx-.02+rnd()*.04
+			P.rx=max(min(P.rx+rnd()-.5,4),2)
+			P.ry=max(min(P.ry+rnd()-.5,5),3)
+		end
+	end
+end
+function back.draw()
+	gc.clear(.2,.2,.2)
+	gc.push("transform")
+	gc.setColor(.7,.7,.7)
+	gc.origin()
+	for i=1,#snow do
+		local P=snow[i]
+		gc.ellipse("fill",P.x,P.y,P.rx,P.ry)
+	end
+	gc.pop()
+end
+function back.discard()
+	snow=false
+end
+return back

parts/scenes/help.lua

@@ -5,7 +5,7 @@ local sin=math.sin
 local scene={}
 
 function scene.sceneInit()
-	BG.set("space")
+	BG.set()
 end
 
 function scene.draw()

parts/scenes/intro.lua

@@ -9,7 +9,7 @@ local scene={}
 local t1,t2,r
 
 function scene.sceneInit()
-	BG.set("space")
+	BG.set()
 	BGM.play("blank")
 	t1,t2=0,0--Timer
 	r={}--Random animation type

parts/scenes/main.lua

@@ -45,7 +45,10 @@ local tip
 
 function scene.sceneInit()
 	tip=text.getTip()
-	BG.set("space")
+	BG.set(
+		FESTIVAL=="Xmas"and"snow"or
+		"space"
+	)
 
 	GAME.modeEnv=NONE
 	--Create demo player

parts/scenes/minigame.lua

@@ -1,7 +1,7 @@
 local scene={}
 
 function scene.sceneInit()
-	BG.set("space")
+	BG.set()
 end
 
 scene.widgetList={

parts/scenes/mode.lua

@@ -20,7 +20,7 @@ local touchDist
 local scene={}
 
 function scene.sceneInit(org)
-	BG.set("space")
+	BG.set()
 	destroyPlayers()
 	local cam=mapCam
 	cam.zoomK=org=="main"and 5 or 1

parts/scenes/setting_game.lua

@@ -4,7 +4,7 @@ local int=math.floor
 local scene={}
 
 function scene.sceneInit()
-	BG.set("space")
+	BG.set()
 end
 function scene.sceneBack()
 	FILE.save(SETTING,"conf/settings")

parts/scenes/setting_sound.lua

@@ -13,7 +13,7 @@ function scene.sceneInit()
 	last=0
 	jump=0
 	cv=SETTING.cv
-	BG.set("space")
+	BG.set()
 end
 function scene.sceneBack()
 	FILE.save(SETTING,"conf/settings")

parts/scenes/setting_video.lua

@@ -1,7 +1,7 @@
 local scene={}
 
 function scene.sceneInit()
-	BG.set("space")
+	BG.set()
 end
 function scene.sceneBack()
 	FILE.save(SETTING,"conf/settings")
@@ -51,7 +51,7 @@ scene.widgetList={
 		code=function()
 			BG.set("none")
 			SETTING.bg=not SETTING.bg
-			BG.set("space")
+			BG.set()
 		end},
 	WIDGET.newSwitch{name="power",		x=990,	y=640,font=35,disp=WIDGET.lnk_SETval("powerInfo"),
 		code=function()

parts/scenes/staff.lua

@@ -8,7 +8,7 @@ local time,v
 function scene.sceneInit()
 	time=0
 	v=1
-	BG.set("space")
+	BG.set()
 end
 
 function scene.mouseDown(x,y)