Array 2D

Demonstrates the syntax for creating a two-dimensional (2D) array. Values in a 2D array are accessed through two index values. 2D arrays are useful for storing images. In this example, each dot is colored in relation to its distance from the center of the image.

from p5 import *

distances = []
maxDiantance = None
spacer = None

def setup():
        size(720, 360)

        global distances, maxDiantance, spacer
        maxDistance = dist((width / 2, height / 2), (width, height))
        for x in range(width):
                d = []
                for y in range(height):
                        distance = dist((width / 2, height / 2), (x, y))
                        d.append((distance / maxDistance) * 255)
                distances.append(d)

        spacer = 10
        no_loop()

def draw():
        background(0)

        for x in range(0, width, spacer):
                for y in range(0, height, spacer):
                        stroke(distances[x][y])
                        point(x + spacer / 2, y + spacer / 2)

if __name__ == '__main__':
  run()