* * A list is an ordered collection of data. Each piece of data in * a list is identified by an index number representing its position in * the list. Lists are zero based, which means that the first * element in the list is [0], the second element is [1], and so on. * In this example, an array named "coswav" is created and * filled with the cosine values. This data is displayed three * separate ways on the screen.
# You can create a new, empty list with a pair of square brackets:
coswave = []
def setup():
size(640, 360)
for i in range(width):
amount = map(i, 0, width, 0, PI)
# "append" adds an element to the end of a list.
coswave.append(abs(cos(amount)))
background(255)
noLoop()
def draw():
y1 = 0
y2 = height / 3
for i in range(0, width, 2):
stroke(coswave[i] * 255)
line(i, y1, i, y2)
y1 = y2
y2 = y1 + y1
for i in range(0, width, 2):
stroke(coswave[i] * 255 / 4)
line(i, y1, i, y2)
y1 = y2
y2 = height
for i in range(0, width, 2):
stroke(255 - coswave[i] * 255)
line(i, y1, i, y2)