请问关于视野遮罩的脚本 - Project1

class Spriteset_Map
#控制視線距離的變數編號
SIGHTRANGE_VARIABLE_INDEX =13
#控制視線限制的開關編號
LIMITEDSIGHT_SWITCHES_INDEX = 03
#定義視線距離
def get_sightrange
return $game_variables[SIGHTRANGE_VARIABLE_INDEX]
end
#定義視線限制是否工作中
def get_working?
return $game_switches[LIMITEDSIGHT_SWITCHES_INDEX]
end
alias gsr_01_initialize initialize
def initialize
#生成fow (fog of war)平面, 並且z值比霧平面(3000)還高
@fow = Plane.new(@viewport1)
@fow.z = 4000
@fow.bitmap = Bitmap.new(640, 480)
gsr_01_initialize
end
alias gsr_01_dispose dispose
def dispose
gsr_01_dispose
@fow.dispose
end
alias gsr_01_update update
def update
#TODO: update及render效能還可改進
gsr_01_update
#更新
sightrange = self.get_sightrange
@fow.visible = self.get_working?
return unless @fow.visible
#計算視距
range = 16+32*sightrange
xx = $game_player.screen_x
yy = $game_player.screen_y
#計算遮罩所在的矩型
r = Rect.new(xx-range, yy-range-16, 2*range, 2*range)
#繪製到fow後緩充
@fow.bitmap.fill_rect(Rect.new(0, 0, 640, 480), Color.new(0, 0, 0))
@fow.bitmap.fill_rect(r, Color.new(0, 0, 0, 0))
@fow.bitmap.stretch_blt(r, FOW_Mask.get_instance, Rect.new(0, 0,
FOW_Mask::Size, FOW_Mask::Size), 255)
end
end
class FOW_Mask < Bitmap
#遮罩解析度內定200*200
Size = 200
#使用Singleton pattern
private_class_method :new
@@mask = nil
def FOW_Mask.get_instance
@@mask = new unless @@mask
return @@mask
end
def initialize
super(Size, Size)
r = Size/2
#加速運算
r2 = r*r
for i in 0...Size
for j in 0...Size
x = r
y = r
dis2 = (i-x)*(i-x) + (j-y)*(j-y)
if dis2 > r*r
self.set_pixel(i, j, Color.new(0,0,0))
else
n = dis2
m = r2
opa = 1.0*n/m*255
self.set_pixel(i, j, Color.new(0,0,0, opa))
end
end
end
end
end

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