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Graph Element - drawing circle, rectangle, etc, objects

Just like you can draw on a tkinter widget, you can also draw on a Graph Element. Graph Elements are easier on the programmer as you get to work in your own coordinate system.

graph recipe

    import PySimpleGUI as sg      

    layout = [      
               [sg.Graph(canvas_size=(400, 400), graph_bottom_left=(0,0), graph_top_right=(400, 400), background_color='red', key='graph')],      
               [sg.T('Change circle color to:'), sg.Button('Red'), sg.Button('Blue'), sg.Button('Move')]      

    window = sg.Window('Graph test', layout, finalize=True)       

    graph = window['graph')      
    circle = graph.DrawCircle((75,75), 25, fill_color='black',line_color='white')      
    point = graph.DrawPoint((75,75), 10, color='green')      
    oval = graph.DrawOval((25,300), (100,280), fill_color='purple', line_color='purple'  )      
    rectangle = graph.DrawRectangle((25,300), (100,280), line_color='purple'  )      
    line = graph.DrawLine((0,0), (100,100))      

    while True:      
        event, values = window.read()      
        if event == sg.WIN_CLOSED:      
        if event is 'Blue':      
            graph.TKCanvas.itemconfig(circle, fill = "Blue")      
        elif event is 'Red':      
            graph.TKCanvas.itemconfig(circle, fill = "Red")      
        elif event is 'Move':      
            graph.MoveFigure(point, 10,10)      
            graph.MoveFigure(circle, 10,10)      
            graph.MoveFigure(oval, 10,10)      
            graph.MoveFigure(rectangle, 10,10)