Star

The star() function created for this example is capable of drawing a wide range of different forms. Try placing different numbers into the star() function calls within draw() to explore.

from p5 import *

def setup():
        size(640, 360)

def draw():
        background(102)

        with push_matrix():
                translate(width*0.2, height*0.5)
                rotate(frame_count / 200.0)
                star(0, 0, 5, 70, 3)

        with push_matrix():
                translate(width*0.5, height*0.5)
                rotate(frame_count / 400.0)
                star(0, 0, 80, 100, 40)

        with push_matrix():
                translate(width*0.8, height*0.5)
                rotate(frame_count / -100.0)
                star(0, 0, 30, 70, 5)

def star(x, y, radius1, raduis2, npoints):
        angle = TWO_PI / npoints
        half_angle = angle/2.0

        begin_shape()
        a = 0
        while a < TWO_PI:
                sx = x + cos(a)*raduis2
                sy = y + sin(a)*raduis2
                vertex(sx, sy)
                sx = x + cos(a+half_angle) * radius1
                sy = y + sin(a+half_angle) * radius1
                vertex(sx, sy)
                a = a + angle

        end_shape()


if __name__ == '__main__':
        run()