# Wavemaker#

This illustrates how waves (like water waves) emerge from particles oscillating in place. Move your mouse to direct the wave. Contributed by Aatish Bhatia, inspired by Orbiters by Dave Whyte.

from proceso import Sketch

p5 = Sketch()
p5.describe(
"A grid of green spirals on a black background. The spirals change their motion based on the mouse position."
)

def setup():
p5.create_canvas(600, 600)
p5.no_stroke()
p5.fill(40, 200, 40)

def draw():
p5.background(10, 10)  # translucent background (creates trails)

# make a x and y grid of ellipses
for x in range(0, p5.width, 30):
for y in range(0, p5.height, 30):
# starting point of each circle depends on mouse position
x_angle = p5.remap(p5.mouse_x, 0, p5.width, -4 * p5.PI, 4 * p5.PI, True)
y_angle = p5.remap(p5.mouse_x, 0, p5.height, -4 * p5.PI, 4 * p5.PI, True)
# and also varies based on the particle's location
angle = x_angle * (x / p5.width) + y_angle * (y / p5.height)

# each particle moves in a circle
t = p5.frame_count * 0.01
my_x = x + 20 * p5.cos(2 * p5.PI * t + angle)
my_y = y + 20 * p5.sin(2 * p5.PI * t + angle)

p5.circle(my_x, my_y, 10)  # draw particle

p5.run_sketch(setup=setup, draw=draw)


View sketch