24. Drawing Regular Polygon

We use a root Node2D and attach a script.

In the script, we draw a polygon of N equal sides, around a center point. As N becomes large, we approach a circle. In the function draw_regular_polygon, we use dictionary col. In the loop we initial or update three keys 'r', 'g', and 'b'. We could have read the elements as col['r'] or col.r, etc.

This is the script to draw the regular polygon:

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extends Node2D

func _ready():
    randomize()

func _draw():
    var cen = Vector2(100, 100)
    var rad = 90
    var N = 8
    draw_regular_polygon(cen, rad, N)

func draw_regular_polygon(cen, rad, N):
    if N < 3: return
    var col = {}
    var cols
    var ang
    var x
    var y
    var points = PoolVector2Array()
    var colors = PoolColorArray()
    for i in range(N + 1):
        col['r'] = rand_range(0,1)
        col['g'] = rand_range(0,1)
        col['b'] = rand_range(0,1)
        cols = Color(col.r, col.g, col.b)
        ang = i * (2 * PI / N)
        x = rad * cos(ang)
        y = rad * sin(ang)
        points.append(cen + Vector2(x, y))
        colors.append(cols)
    draw_polygon(points, colors)

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The 8-sided polygon is shown below: