Regular Polygon

What is your favorite? Pentagon? Hexagon? Heptagon? No? What about the icosagon? The polygon() function created for this example is capable of drawing any regular polygon. Try placing different numbers into the polygon() 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)
                polygon(0, 0, 82, 3) # Triangle

        with push_matrix():
                translate(width*0.5, height*0.5)
                rotate(frame_count / 50.0)
                polygon(0, 0, 80, 20)


        with push_matrix():
                translate(width*0.8, height*0.5)
                rotate(frame_count / -100.0)
                polygon(0, 0, 70, 7)

def polygon(x, y, radius, npoints):
        angle = TWO_PI / npoints

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

                a = a + angle

        end_shape()


if __name__ == '__main__':
        run()