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from PIL import Image, ImageDraw
import numpy as np
from moviepy import VideoClip
import math
WIDTH, HEIGHT = (128, 128)
RED = (255, 0, 0)
def frame_function(t):
frequency = 1 # One pulse per second
coef = 0.5 * (1 + math.sin(2 * math.pi * frequency * t)) # radius varies over time
radius = WIDTH * coef
x1 = WIDTH / 2 - radius / 2
y1 = HEIGHT / 2 - radius / 2
x2 = WIDTH / 2 + radius / 2
y2 = HEIGHT / 2 + radius / 2
img = Image.new("RGB", (WIDTH, HEIGHT))
draw = ImageDraw.Draw(img)
draw.ellipse((x1, y1, x2, y2), fill=RED)
return np.array(img) # returns a 8-bit RGB array
# we define a 2s duration for the clip to be able to render it later
clip = VideoClip(frame_function, duration=2)
# we must set a framerate because VideoClip have no framerate by default
clip.write_gif("circle.gif", fps=15)
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