flowers.py

from PIL import Image, ImageDraw
import random
import math
images = []
w, h = 500, 300

class Particle:
    _x = 0
    _y = 0
    x = 0
    y = 0
    angle = 0
    speed = 0
    color = (0,0,0)
    turn_skip = 0
    turn_speed = 1
    counter = 0

    def __init__(self, x, y):
        self.x = x + random.randint(-3, 3)
        self.y = y
        self._x = x
        self._y = y
        self.speed = random.randint(0, 200)/100
        self.color = (0, 255, random.randint(0, 50))  # start color
        self.angle = -math.pi/2
        self.turn_skip = random.randint(20,60)
        self.turn_speed = 1

    def turn(self):
        self.counter += 1
        if self.counter > self.turn_skip:
            self.counter = 0
            self.angle = self.angle + random.randint(-10, 10)/100*self.turn_speed
            self.turn_skip /= 2
            self.turn_speed *= 1.1
            r,g,b = self.color
            g -= 2
            if g < 0:
                g = 0
            r += 2
            if r > 255:
                r = 255
            self.color = (r,g,b)

    def move(self):
        dx = self.speed*math.cos(self.angle)
        dy = self.speed*math.sin(self.angle)
        self._x = self.x
        self._y = self.y
        self.x += dx
        self.y += dy


each_third = 0
def draw_particles(flowers):
    global each_third
    if len(images) > 0:
        each_third = (each_third + 1) % 3
        if each_third == 0:
            im = images[-1].copy()
        else:
            im = images[-1]
    else:
        im = Image.new('RGB', (w,h), (130, 200, 250))
    draw = ImageDraw.Draw(im)

    for fl in flowers:
        draw.line((fl._x, fl._y, fl.x, fl.y), fill=fl.color, width=1)
    images.append(im)

grass = []
for i in range(500):
    grass.append(Particle(random.randint(0, w), h))
for i in range(35):
    for j in range(len(grass)):
        grass[j].turn()
        grass[j].move()
    draw_particles(grass)

flowers = []
for i in range(50):
    flowers.append(Particle(w / 2, h))
    flowers.append(Particle(w / 4, h))
    flowers.append(Particle(w * 3 / 4, h))
for i in range(300):
    for flower in flowers:
        flower.turn()
        flower.move()
    draw_particles(flowers)

for i in range(30):
    images.append(images[-1].copy())


images[0].save('flowers.gif',
               save_all=True, append_images=images[1:],
               optimize=True, duration=20, loop=0)

images[-1].save("flower.png")