Major update of all demo programs to use new PEP8 bindings, etc

DemoPrograms old/Demo_Graph_Element_Sine_Wave.py

@@ -0,0 +1,51 @@
+# import PySimpleGUIWeb as sg
+# import PySimpleGUIQt as sg
+import PySimpleGUI as sg
+import math
+
+SIZE_X = 200
+SIZE_Y = 100
+NUMBER_MARKER_FREQUENCY = 25
+
+def draw_axis():
+    graph.draw_line((-SIZE_X,0), (SIZE_X, 0))                # axis lines
+    graph.draw_line((0,-SIZE_Y), (0,SIZE_Y))
+
+    for x in range(-SIZE_X, SIZE_X+1, NUMBER_MARKER_FREQUENCY):
+        graph.draw_line((x,-3), (x,3))                       # tick marks
+        if x != 0:
+            graph.draw_text( str(x), (x,-10), color='green', font='Algerian 15')      # numeric labels
+
+    for y in range(-SIZE_Y, SIZE_Y+1, NUMBER_MARKER_FREQUENCY):
+        graph.draw_line((-3,y), (3,y))
+        if y != 0:
+            graph.draw_text( str(y), (-10,y), color='blue')
+
+# Create the graph that will be put into the window
+graph = sg.Graph(canvas_size=(400, 400),
+          graph_bottom_left=(-(SIZE_X+5), -(SIZE_Y+5)),
+          graph_top_right=(SIZE_X+5, SIZE_Y+5),
+          background_color='white',
+          key='graph')
+# Window layout
+layout = [[sg.Text('Example of Using Math with a Graph', justification='center', size=(50,1), relief=sg.RELIEF_SUNKEN)],
+          [graph],
+          [sg.Text('y = sin(x / x2 * x1)', font='Algerian 18')],
+          [sg.Text('x1'),sg.Slider((0,200), orientation='h', enable_events=True,key='_SLIDER_')],
+          [sg.Text('x2'),sg.Slider((1,200), orientation='h', enable_events=True,key='_SLIDER2_')]]
+
+window = sg.Window('Graph of Sine Function', layout)
+
+while True:
+    event, values = window.read()
+    if event is None:
+        break
+    graph.erase()
+    draw_axis()
+    prev_x = prev_y = None
+    for x in range(-SIZE_X,SIZE_X):
+        y = math.sin(x/int(values['_SLIDER2_']))*int(values['_SLIDER_'])
+        if prev_x is not None:
+            graph.draw_line((prev_x, prev_y), (x,y), color='red')
+        prev_x, prev_y = x, y
+