Completely new set of materials for GUI class! Thanks Tony!!

ProgrammingClassExamples/10f PSG (linear and quadratics).py

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+#matplotlib, numpy, pyplot
+#Tony Crewe
+#Oct 2018
+
+import PySimpleGUI as sg
+import matplotlib.pyplot as plt
+import matplotlib.ticker as ticker
+from matplotlib.backends.backend_tkagg import FigureCanvasAgg
+import matplotlib.backends.tkagg as tkagg
+import numpy as np
+import tkinter as tk
+
+sg.ChangeLookAndFeel('Purple')
+sg.SetOptions(font = ('Calibri', 14, 'bold'))
+
+def draw_figure(canvas, figure, loc = (0,0)):
+
+    figure_canvas_agg = FigureCanvasAgg(figure) 
+    figure_canvas_agg.draw()
+    figure_x, figure_y, figure_w, figure_h = figure.bbox.bounds
+    figure_w, figure_h = int(figure_w), int(figure_h)
+    photo = tk.PhotoImage(master=canvas, width=figure_w, height=figure_h)
+    canvas.create_image(loc[0] + figure_w/2, loc[1] + figure_h/2, image=photo)
+    tkagg.blit(photo, figure_canvas_agg.get_renderer()._renderer, colormode=2)
+    return photo
+
+
+#------------ Matplotlib code --------------------
+
+def set_plot(a,b,c, function):
+    global figure_w, figure_h, fig
+    fig=plt.figure()
+    ax = fig.add_subplot(111)
+    x = np.linspace(-10, 10, 100)
+    if function == 'y = ax + b':
+        y= a*x + b
+        if a == 1:
+            a = ''
+        if a == -1:
+            a = '-'
+        title = str('y = ') + str(a) + 'x + ' + str(b)
+        ax.set_title(title)
+    else:
+        y = a*x**2 + b*x + c
+        #avoiding getting -1x or -1x**2 instead of -x for title
+        if a == 1:
+            a = ''
+        if a == -1:
+            a = '-'
+        if b == 1:
+            b = ''
+        if b == -1:
+            b = '-'
+        title = str('y = ') + str(a) + 'x**2 + ' + str(b) + 'x + ' + str(c) 
+        ax.set_title(title)
+    plt.plot(x,y)
+
+    
+    #centre bottom and left axes to zero
+
+    ax.spines['left'].set_position('zero')
+    ax.spines['right'].set_color('none')
+    ax.spines['bottom'].set_position('zero')
+    ax.spines['top'].set_color('none')
+
+
+    figure_x, figure_y, figure_w, figure_h = fig.bbox.bounds
+amp = 1
+function = 'y = ax + b'
+set_plot(1,1,1, function)
+
+#------------End Matplotlib code --------------------
+
+#column 1 for function type and constant values ...
+
+column1 = [
+           [sg.Text('Select constants and function type', )],
+           [sg.InputCombo(['y = ax + b', 'y = ax^2 + bx + c'], size = (12, 4), key = '_function_'),
+            sg.Text('Function', size = (10, 1))], [sg.Text('', size = (1, 2))],
+            [sg.Spin([sz for sz in range (-6,6)], initial_value =1, size = (2,1), key = '_a_'),
+                sg.Text('a', size = (3, 1)),
+           sg.Spin([sz for sz in range (-6,6)], initial_value =1, size = (2,1), key = '_b_'),
+                sg.Text('b', size = (3, 1)),
+           sg.Spin([sz for sz in range (-6,6)], initial_value =1, size = (2,1), key = '_c_'),
+                sg.Text('c', size = (3, 1))], [sg.Text('', size = (1, 1))],   
+               [sg.ReadButton('Redraw Plot')],
+               [sg.Text('', size = (1, 14))]]
+               
+column2 = [[sg.Text('Plot Test - PySimpleGUI and Matplotlib and options')],
+          [sg.Canvas(size = (figure_w, figure_h), key = '_canvas_')],
+          [sg.OK(pad=((figure_w / 2, 0), 1), size=(4, 1))]]
+
+layout = [[sg.Column(column1), sg.Column(column2)]]
+window = sg.Window('Matplot, PySimpleGUI and options', force_toplevel = True).Layout(layout).Finalize()
+
+fig_photo = draw_figure(window.FindElement('_canvas_').TKCanvas, fig)
+
+while True:
+    button, value = window.Read()
+    if button == 'Redraw Plot':
+        a = int(value['_a_'])
+        b = int(value['_b_'])
+        c = int(value['_c_'])
+        function = value['_function_']
+        set_plot(a,b,c,function)
+        fig_photo = draw_figure(window.FindElement('_canvas_').TKCanvas, fig)
+        
+    if button is None:   
+        break
+
+