NEW demo program - Fourier Transform. Updated Calendar demo

DemoPrograms/Demo_Graph_FourierTransform.py

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+import math
+import numpy as np
+import PySimpleGUI as sg
+import time
+
+"""
+    Fourier Transform Animated Graph
+    
+    A fun demonstration of the Graph Element and the drawing primitive draw_lines
+    Written by Jason Yang, by an innovative PySimpleGUI user that has created a number
+    of impressive animations using PySimpleGUI.
+    
+    Copyright 2020 Jason Yang
+"""
+
+def push(v):
+    if len(buffer)==size:
+        del buffer[-1]
+    buffer[0:0] = [v]
+
+def update(i):
+    draw.Erase()
+    x1 = x0 + r1*math.cos(v1*i*rad)
+    y1 = y0 + r1*math.sin(v1*i*rad)
+    x2 = x1 + r2*math.cos(v2*i*rad)
+    y2 = y1 + r2*math.sin(v2*i*rad)
+    x3 = x2 + r3*math.cos(v3*i*rad)
+    y3 = y2 + r3*math.sin(v3*i*rad)
+    push(y3)
+    draw.DrawCircle((x0, y0), r1, line_color='blue')
+    draw.DrawCircle((x1, y1), r2, line_color='yellow')
+    draw.DrawCircle((x2, y2), r3, line_color='red')
+    draw.DrawLine((x0, y0), (x1, y1), color='magenta')
+    draw.DrawLine((x1, y1), (x2, y2), color='white')
+    draw.DrawLine((x2, y2), (x3, y3), color='white')
+    draw.DrawLine((x3, y3), (x[0]+xx, buffer[0]), color='ivory')
+    draw.DrawPoint((x3, y3), size=10, color='red')
+    lines = ((x[i]+xx, y) for i, y in enumerate(buffer))
+    draw.DrawLines(lines, color='green1')
+
+size = 720
+distance = 100
+r0, r1, r2, r3 = 90, 90, 30, 18
+rad = math.pi/180
+v1, v2, v3 = 1, 3, 5
+x = np.array(list(range(size)))
+x0 = y0 = r1+r2+r3
+xx = x0*2 + distance
+buffer = []
+win_size = (xx+size, 2*x0)
+
+layout = [[sg.Graph(canvas_size=win_size, graph_bottom_left=(0, 0),
+                     graph_top_right=win_size, key='-GRAPH-')]]
+window = sg.Window('Fourier', layout=layout, finalize=True)
+draw = window['-GRAPH-']
+
+i = 0
+timeout = refresh_interval = 10    # Target refresh interval = 10 milliseconds
+
+while True:
+    start_time = time.time()
+
+    event, values = window.read(timeout=timeout)
+    if event == None:
+        break
+
+    update(i)
+    i = i+1 if i<359 else 0
+
+    timeout = max(0, (refresh_interval - (time.time()-start_time)*1000))
+
+window.close()