1 files changed, 86 insertions, 0 deletions
diff --git a/demos/2d/fog_of_war/fog.gd b/demos/2d/fog_of_war/fog.gd
new file mode 100644
index 0000000000..9da5680e4d
--- /dev/null
+++ b/demos/2d/fog_of_war/fog.gd
@@ -0,0 +1,86 @@
+
+extends TileMap
+
+# member variables here, example:
+# var a=2
+# var b="textvar"
+
+# boundarys for the fog rectangle
+var x_min = -20 # left start tile
+var x_max = 20 # right end tile
+var y_min = -20 # top start tile
+var y_max = 20 # bottom end tile
+
+var position # players position
+
+# iteration variables
+var x
+var y
+
+# variable to check if player moved
+var x_old
+var y_old
+
+# array to build up the visible area like a square
+# first value determines the width/height of the tip
+# here it would be 2*2 + 1 = 5 tiles wide/high
+# second value determines the total squares size
+# here it would be 5*2 + 1 = 10 tiles wide/high
+var l = range(2,5)
+
+# process that runs in realtime
+func _fixed_process(delta):
+	position = get_node("../troll").get_pos()
+	
+	# calculate the corresponding tile
+	# from the players position
+	x = int(position.x/get_cell_size().x)
+	# switching from positive to negative tile positions
+	# causes problems because of rounding problems
+	if position.x < 0:
+		x -= 1 # correct negative values
+	
+	y = int(position.y/get_cell_size().y)
+	if position.y < 0:
+		y -= 1
+		
+	# check if the player moved one tile further
+	if (x_old != x) or (y_old != y):
+		
+		# create the transparent part (visited area)
+		var end = l.size()-1
+		var start = 0
+		for steps in range(l.size()):
+			for m in range(x-l[end]-1,x+l[end]+2):
+				for n in range(y-l[start]-1,y+l[start]+2):
+					if get_cell(m,n) != 0:
+						set_cell(m,n,1,0,0)
+			end -= 1
+			start += 1
+	
+		# create the actual and active visible part
+		var end = l.size()-1
+		var start = 0
+		for steps in range(l.size()):
+			for m in range(x-l[end],x+l[end]+1):
+				for n in range(y-l[start],y+l[start]+1):
+					set_cell(m,n,-1)
+			end -= 1
+			start += 1
+		
+	x_old = x
+	y_old = y
+	
+	pass
+
+func _ready():
+	# Initalization here
+	
+	# create a square filled with the 100% opaque fog
+	for x in range(x_min,x_max):
+		for y in range(y_min,y_max):
+			set_cell(x,y,0,0,0)
+	set_fixed_process(true)
+	pass
+
+