Demo_Graph_pymunk_Desktop_Balls.py

import PySimpleGUI as sg
import pymunk
import random
"""
    Demo of pymunk physics lib combined with a large Window that is transparent. Result appears like
    a screensaver type of screen
    
    Copyright 2023 PySimpleSoft, Inc. and/or its licensors. All rights reserved.
    
    Redistribution, modification, or any other use of PySimpleGUI or any portion thereof is subject to the terms of the PySimpleGUI License Agreement available at https://eula.pysimplegui.com.
    
    You may not redistribute, modify or otherwise use PySimpleGUI or its contents except pursuant to the PySimpleGUI License Agreement.
"""

class Ball():
    def __init__(self, x, y, r, *args, **kwargs):
        mass = 10
        # Create a Body with mass and moment
        self.body = pymunk.Body(mass, pymunk.moment_for_circle(mass, 0, r, (0, 0)))
        self.body.position = x, y
        # Create a box shape and attach to body
        self.shape = pymunk.Circle(self.body, r, offset=(0, 0))
        self.shape.elasticity = 0.99999
        self.shape.friction = 0.8
        self.gui_circle_figure = None


class Playfield():
    def __init__(self, graph_elem, screensize):
        self.graph_elem = graph_elem            # type: sg.Graph
        self.space = pymunk.Space()
        self.space.gravity = 0, 200
        self.screensize = screensize
        self.add_wall((0, screensize[1]), (screensize[0],screensize[1]))  # ground
        self.add_wall((0, 0), (0, screensize[1]))  # Left side
        self.add_wall((screensize[0], 0), (screensize[0], screensize[1]))  # right side
        self.arena_balls = []       # type: List[Ball]

    def add_wall(self, pt_from, pt_to):
        body = pymunk.Body(body_type=pymunk.Body.STATIC)
        ground_shape = pymunk.Segment(body, pt_from, pt_to, 1.0)
        ground_shape.friction = 0.8
        ground_shape.elasticity = .99
        self.space.add(ground_shape)

    def add_balls(self, num_balls = 30):
        for i in range(1, num_balls):
            x = random.randint(0, self.screensize[0])
            y = random.randint(0, self.screensize[1])
            r = random.randint(5, 10)
            ball = Ball(x, y, r)
            self.arena_balls.append(ball)
            self.space.add(ball.body, ball.shape)
            ball.gui_circle_figure = self.graph_elem.draw_circle(
                (x, y), r, fill_color=random.choice(('#23a0a0', '#56d856', '#be45be', '#5681d8', '#d34545', '#BE7C29')), line_width=0)


def main():
    screensize = sg.Window.get_screen_size()

    # -------------------  Build and show the GUI Windows -------------------
    graph_elem = sg.Graph(screensize, (0, screensize[1]), (screensize[0], 0),
                          enable_events=True, key='-GRAPH-', background_color='lightblue')
    layout = [[graph_elem]]
    window1 = sg.Window('Bouncing Balls', layout, finalize=True, location=(0,0), keep_on_top=True,  element_padding=(0,0), margins=(0,0), no_titlebar=True, right_click_menu=[[''], ['Front', 'Back', 'Controls', 'Exit']])

    area = Playfield(graph_elem, screensize)
    area.add_balls()
    transparent, paused = False, True
    layout2 = [[sg.B('❎', border_width=0, button_color=('white', sg.theme_background_color()), key='Exit')],[sg.B('Kick'), sg.B('Front'), sg.B('Back'), sg.B('More Balls'),sg.B('Transparent'), sg.B('Resume', key='Pause')]]
    window2 = sg.Window('Buttons', layout2, keep_on_top=True, grab_anywhere=True, no_titlebar=True, finalize=True)



    # ------------------- GUI Event Loop -------------------
    while True:
        window, event, values = sg.read_all_windows(timeout=0)
        if event in (sg.WIN_CLOSED, 'Exit'):
            break

        if event == 'More Balls':
            area.add_balls()
        elif event == 'Kick':
            for ball in area.arena_balls:
                ball.body.position = ball.body.position[0], ball.body.position[1]-random.randint(200,400)
        elif event == 'Front':
            window1.bring_to_front()
        elif event == 'Back':
            window1.send_to_back()
        elif event == 'Transparent':
            window1.set_transparent_color('lightblue' if not transparent else 'black')
            transparent = not transparent
        elif event == 'Controls':
            window2.bring_to_front()
        elif event == 'Pause':
            paused = not paused
            window['Pause'].update(text='Resume' if paused else 'Pause')

        if paused:
            continue

        area.space.step(0.02)

        for ball in area.arena_balls:
            if ball.body.position[1] > screensize[1]:
                ball.body.position = ball.body.position[0],screensize[1]-30

            graph_elem.RelocateFigure(
                ball.gui_circle_figure, ball.body.position[0], ball.body.position[1])

    window1.close()
    window2.close()

if __name__ == '__main__':
    main()