Initial Checkin of pymunk 2D graphics demo

DemoPrograms/Demo_Graph_pymunk_2D_Graphics.py

@@ -0,0 +1,60 @@
+import PySimpleGUI as sg
+import pymunk
+import random
+
+"""
+    Demo that shows integrating PySimpleGUI with the pymunk library.  This combination
+    of PySimpleGUI and pymynk could be used to build games.
+    Note this exact same demo runs with PySimpleGUIWeb by changing the import statement
+"""
+
+class Ball():
+    def __init__(self, x, y, r, *args, **kwargs):
+        mass = 10
+        self.body = pymunk.Body(mass,
+                                pymunk.moment_for_circle(mass, 0, r, (0, 0)))  # Create a Body with mass and moment
+        self.body.position = x, y
+        self.shape = pymunk.Circle(self.body, r, offset=(0, 0))  # Create a box shape and attach to body
+        self.shape.elasticity = 0.95
+        self.shape.friction = 0.9
+        self.gui_circle_figure = None
+
+
+graph_elem = sg.Graph((400, 400), (0, 400), (400, 0), enable_events=True, key='_GRAPH_', background_color='lightblue')
+
+layout = [[sg.Text('Ball Test', tooltip='Tips')],
+          [graph_elem],
+          [sg.Button('Exit')]]
+
+window = sg.Window('Window Title', layout, ).Finalize()
+
+space = pymunk.Space()
+space.gravity = 0, 1000
+
+# ground
+ground_body = pymunk.Body(body_type=pymunk.Body.STATIC)
+ground_shape = pymunk.Segment(ground_body, (0, 400), (400, 400), 0.0)
+ground_shape.friction = 0.9
+ground_shape.elasticity = 0.95
+space.add(ground_shape)
+
+arena_balls = []
+for i in range(1, 300):
+    x = random.randint(100, 300)
+    y = random.randint(100, 300)
+    r = random.randint(5, 10)
+    ball = Ball(x, y, r)
+    ball.gui_circle_figure = graph_elem.DrawCircle((x, y), r, fill_color='black', line_color='red')
+    arena_balls.append(ball)
+    space.add(ball.body, ball.shape)
+
+while True:  # Event Loop
+    event, values = window.Read(timeout=0)
+    # print(event, values)
+    if event in (None, 'Exit'):
+        break
+    space.step(0.01)
+    for ball in arena_balls:
+        graph_elem.RelocateFigure(ball.gui_circle_figure, ball.body.position[0], ball.body.position[1])
+
+window.Close()