春节主题+背景+音乐

parts/backgrounds/firework.lua

@@ -0,0 +1,99 @@
+--Firework
+local gc=love.graphics
+local circle,line=gc.circle,gc.line
+local rnd=math.random
+local ins,rem=table.insert,table.remove
+local back={}
+
+local t
+local firework,particle
+function back.init()
+	t=26
+	firework,particle={},{}
+	BG.resize()
+end
+function back.update(dt)
+	t=t-1
+	if t==0 then
+		ins(firework,{
+			x=nil,y=nil,
+			x0=SCR.W*(rnd()*1.2-.1),
+			y0=SCR.H*1.5,
+			x1=SCR.W*(.15+rnd()*.7),
+			y1=SCR.H*(.15+rnd()*.4),
+			t=0,
+			v=.5+rnd(),
+			color=COLOR.random_bright(),
+			big=rnd()<.1,
+		})
+		t=rnd(26,62)
+	end
+	for i=#firework,1,-1 do
+		local F=firework[i]
+		local time=F.t^.5
+		if time>1 then
+			local x,y,color=F.x,F.y,F.color
+			if F.big then
+				SFX.play("clear_3",.4)
+				for _=1,rnd(62,126)do
+					ins(particle,{
+						x=x,y=y,
+						color=color,
+						vx=rnd()*16-8,
+						vy=rnd()*16-8,
+						t=1,
+					})
+				end
+			else
+				SFX.play("clear_2",.35)
+				for _=1,rnd(16,26)do
+					ins(particle,{
+						x=x,y=y,
+						color=color,
+						vx=rnd()*8-4,
+						vy=rnd()*8-4,
+						t=1,
+					})
+				end
+			end
+			rem(firework,i)
+		else
+			F.t=F.t+dt*F.v
+			F.x=F.x0*(1-time)+F.x1*time
+			F.y=F.y0*(1-time)+F.y1*time
+		end
+	end
+	for i=#particle,1,-1 do
+		local P=particle[i]
+		if P.t<0 then
+			rem(particle,i)
+		else
+			P.x=P.x+P.vx
+			P.y=P.y+P.vy
+			P.vy=P.vy+.04
+			P.t=P.t-dt*.6
+		end
+	end
+end
+function back.draw()
+	gc.clear(.1,.1,.1)
+	gc.push("transform")
+	gc.origin()
+	for i=1,#firework do
+		local F=firework[i]
+		gc.setColor(F.color)
+		circle("fill",F.x,F.y,F.big and 8 or 4)
+	end
+	gc.setLineWidth(3)
+	for i=1,#particle do
+		local P=particle[i]
+		local c=P.color
+		gc.setColor(c[1],c[2],c[3],P.t)
+		line(P.x,P.y,P.x-P.vx*4,P.y-P.vy*4)
+	end
+	gc.pop()
+end
+function back.discard()
+	firework=nil
+end
+return back