```
extends Node2D
var tilesArray = []
var center = Vector2(300, 300)
func _ready():
for i in range(0, 20):
tilesArray.append([])
for j in range(0, 20):
var point = Vector2(i*50, j*50)
var x = point.angle_to_point(center)/PI
var rand_min = rand_range(0.35, 0.65)
var rand_max = rand_range(0, 0.15)
var r = max(min(-10*(x+11.0/12.0)*(x-7.0/12.0), rand_min), rand_max)
var g = max(min(10*(x+9.0/12.0)*(x+3.0/12.0), rand_min), rand_max)
var b = max(min(10*(x+1.0/12.0)*(x-5.0/12.0), rand_min), rand_max)
tilesArray[i].append([r, g, b])
func _draw():
for i in range(0, 20):
for j in range(0, 20):
draw_rect(Rect2(i*50, j*50, 50, 50), Color(tilesArray[i][j][0], tilesArray[i][j][1], tilesArray[i][j][2], 1))
```

I made this code sample to generate a small colored map.

Just running this on a Node2D works fine except for some small visual glitches :

Some of the rectangles disappear for a fraction of a second sporadically, even though I don't redraw.

Any idea why ?

Am I using _draw() wrong ?

What should I do ?

Thanks in advance for your help :)