Trying to draw grid using draw(), but code doesn't work

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I’ve been trying to write a function that would use draw() to draw a grid on the screen, but i’m trying to figure out the reason to why the code isn’t working

Here’s the code:

``````extends Node2D
``````

var SizeX = 3
var SizeY = 3
var LineColor = Color(1.0, 0.0, 0.0)

``````func draw_grid(SizeX, SizeY, LineColor):

#Reminder of the square size
var SquareSize = Vector2(50, 50)

#Point Type Check
var IsPassingLeftX = true
var IsPassingTopY = true

#Num of points
var PointsX = SizeX + SizeX
var PointsY = SizeY + SizeY
var NumOfPoints = PointsX + PointsY

#Spacing between squares
var SpacingValueX = Vector2(0, 50)
var SpacingValueY = Vector2(50, 0)

#Starting points
var StartingPoint = Vector2(100,100)
var StartingPointLeftX = Vector2(100,100)
var StartingPointTopY = Vector2(100,100)
var StartingPointRightX = Vector2(100,100) + SpacingValueX * SizeX
var StartingPointDownY = Vector2(100,100) + SpacingValueY * SizeY

#Array of points
var Points = PoolVector2Array()

#Get all X points from the left side of screen
for i in PointsX:
if(IsPassingLeftX == true):
Points.push_back(StartingPointLeftX)
StartingPointLeftX = StartingPointLeftX + SpacingValueX
IsPassingLeftX = false
else:
Points.push_back(StartingPointRightX)
StartingPointRightX = StartingPointRightX + SpacingValueX
IsPassingLeftX = true

#Get all Y points from the top side of the screen
for i in PointsY:
if(IsPassingTopY == true):
Points.append(StartingPointTopY)
StartingPointTopY = StartingPointTopY + SpacingValueY
IsPassingTopY = false
else:
Points.append(StartingPointDownY)
StartingPointDownY = StartingPointDownY + SpacingValueY
IsPassingTopY = true

#draw the grid
for i in range(NumOfPoints - 1):
draw_line(Points[i], Points[i + 1], LineColor)
i = i + 1
``````

func _process(delta):
update()

func _draw():
draw_grid(SizeX, SizeY, LineColor)

``````extends Node2D