Learn PROCESSING-PY with Real Code Examples

def setup():
    size(400, 200)
    background(255)
    fill(0)
    textSize(32)
    text("Hello World", 100, 100)

A simple Processing.py sketch that displays 'Hello World' in a window.

def setup():
    size(400, 400)
    background(255)
    fill(0, 0, 255)
    ellipse(width/2, height/2, 100, 100)

Draws a blue circle in the center of the canvas.

x = 0

def setup():
    size(400, 200)

def draw():
    global x
    background(255)
    fill(255, 0, 0)
    rect(x, 100, 50, 50)
    x = (x + 2) % width

Animates a rectangle moving horizontally across the screen.

def setup():
    size(400, 400)
    background(255)

def draw():
    if mousePressed:
        fill(0, 255, 0)
        ellipse(mouseX, mouseY, 50, 50)

Draws an ellipse at the mouse position whenever the mouse is pressed.

def setup():
    size(400, 400)
    background(255)
    fill(255, 0, 0)
    rect(50, 50, 100, 100)
    fill(0, 255, 0)
    eclipse(300, 100, 80, 80)
    fill(0, 0, 255)
    line(50, 300, 350, 300)

Draws multiple shapes with different colors on the canvas.

x, y = 0, 0

def setup():
    size(400, 400)

def draw():
    global x, y
    background(255)
    fill(0)
    ellipse(x, y, 50, 50)
    x = (x + 2) % width
    y = (y + 2) % height

A circle moving diagonally across the canvas in an animation loop.

r = 0

def setup():
    size(400, 400)

def draw():
    global r
    background(r, 100, 150)
    r = (r + 1) % 256

Changes the background color gradually over time.

x, y = 200, 200
xSpeed, ySpeed = 3, 4

def setup():
    size(400, 400)

def draw():
    global x, y, xSpeed, ySpeed
    background(255)
    fill(0)
    ellipse(x, y, 50, 50)
    x += xSpeed
    y += ySpeed
    if x > width or x < 0:
        xSpeed *= -1
    if y > height or y < 0:
        ySpeed *= -1

A ball that bounces off the edges of the canvas.

def setup():
    size(400, 400)
    background(255)

def draw():
    stroke(random(255), random(255), random(255))
    line(random(width), random(height), random(width), random(height))

Draws random lines continuously on the canvas.

def setup():
    size(400, 400)
    background(255)

def draw():
    noStroke()
    fill(0, 0, 255, 100)
    eclipse(mouseX, mouseY, 20, 20)

Leaves a trail of small circles following the mouse.