blackhole背景改名blockhole

parts/backgrounds/blockhole.lua

@@ -0,0 +1,66 @@
+--blockhole
+local gc=love.graphics
+local gc_clear,gc_replaceTransform=gc.clear,gc.replaceTransform
+local gc_setColor,gc_setLineWidth=gc.setColor,gc.setLineWidth
+local gc_draw,gc_circle=gc.draw,gc.circle
+
+local sin,cos=math.sin,math.cos
+local rnd=math.random
+local ins,rem=table.insert,table.remove
+local back={}
+
+local t
+local squares
+function back.init()
+    t=26
+    squares={}
+end
+function back.update()
+    t=t-1
+    if t==0 then
+        local S={
+            ang=6.2832*rnd(),
+            d=SCR.rad*1.05/2,
+            rotate=6.2832*rnd(),
+            va=.05-rnd()*.1,
+            size=SCR.rad*(2+rnd()*3)/100,
+            texture=SKIN.lib[SETTING.skinSet][rnd(16)],
+        }
+        ins(squares,S)
+        t=rnd(6,12)
+    end
+    for i=#squares,1,-1 do
+        local S=squares[i]
+        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
+    end
+end
+function back.draw()
+    gc_clear(.1,.1,.1)
+    gc_replaceTransform(SCR.xOy_m)
+
+    --Squares
+    gc_setColor(1,1,1,.2)
+    for i=1,#squares do
+        local S=squares[i]
+        gc_draw(S.texture,S.d*cos(S.ang),S.d*sin(S.ang),S.rotate,S.size*.026,nil,15,15)
+    end
+
+    --blockhole
+    gc_setColor(.07,.07,.07)
+    gc_circle('fill',0,0,157)
+    gc_setLineWidth(6)
+    for i=0,15 do
+        gc_setColor(.07,.07,.07,1-i*.0666)
+        gc_circle('line',0,0,160+6*i)
+    end
+end
+function back.discard()
+    squares=nil
+end
+return back