add some paning example

Author: swistakm

examples/paning.py

@@ -0,0 +1,40 @@
+# -*- coding: utf-8 -*-
+import time
+from math import sin, cos
+
+from pyrilla import core
+
+from base import main
+
+
+def pan_voices(lvoice, rvoice, t):
+    # use two sounds like two independent channels
+    # its not as good as HRTF but can fake that
+    # sound source moves if you really want to believe :)
+    lvoice.gain = ((sin(t) + 1.) / 2.)
+    rvoice.gain = ((cos(t) + 1.) / 2.)
+
+
+def file_handle(filename, ext):
+    sound = core.Sound(filename, ext)
+    lvoice = core.Voice(sound, loop=True)
+    rvoice = core.Voice(sound, loop=True)
+
+    lvoice.play()
+    rvoice.play()
+
+    lvoice.pan = -1.
+    rvoice.pan = 1.
+
+    try:
+        while True:
+            pan_voices(lvoice, rvoice, time.time())
+            core.update()
+            time.sleep(0.001)
+
+
+    except KeyboardInterrupt:
+        print("interrupted")
+
+if __name__ == "__main__":
+    main(file_handle)