New Graph Element ! Graph on a canvas using your own coordinate system. Demo program for Graph Element, Exception handling for CPU widget. Sometimes as getting error from psutil

Demo_Graph__Element.py

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+import ping
+from threading import Thread
+import time
+import PySimpleGUI as sg
+
+# globale used to communicate with thread.. yea yea... it's working fine
+g_exit = False
+g_response_time = None
+def ping_thread(args):
+    global g_exit, g_response_time
+    while not g_exit:
+        g_response_time = ping.quiet_ping('google.com', timeout=1000)
+
+def main():
+    global g_exit, g_response_time
+    # start ping measurement thread
+    thread = Thread(target=ping_thread, args=(None,))
+    thread.start()
+
+    layout = [  [sg.T('Ping times to Google.com', font='Any 18')],
+               [sg.Graph((300,300), (0,0), (100,500),background_color='white', key='graph')],
+               [sg.Quit()]]
+
+    form = sg.FlexForm('Canvas test', grab_anywhere=True)
+    form.Layout(layout)
+
+    prev_response_time = None
+    i=0
+    prev_x, prev_y  = 0, 0
+    while True:
+        time.sleep(.2)
+
+        button, values = form.ReadNonBlocking()
+        if button == 'Quit' or values is None:
+            break
+
+        if g_response_time is None or prev_response_time == g_response_time:
+            continue
+        new_x, new_y = i, g_response_time[0]
+        prev_response_time = g_response_time
+        form.FindElement('graph').DrawLine((prev_x, prev_y), (new_x, new_y), color='red')
+        # form.FindElement('graph').DrawPoint((new_x, new_y), color='red')
+        prev_x, prev_y = new_x, new_y
+        if i >= 100:
+            i = 0
+            prev_x = prev_y = last_x = last_y = 0
+            form.FindElement('graph').Erase()
+        else: i += 4
+
+    # tell thread we're done. wait for thread to exit
+    g_exit = True
+    thread.join()
+
+
+if __name__ == '__main__':
+    main()
+    exit(69)