-geometry widthxheight{+|-}x-offset{+|-}y-offset
height: Height of the window in pixels.
+x-offset: Pixels from the right of the screen.
-x-offset: Pixels from the left of the screen.
+y-offset: Pixels from the top of the screen.
-y-offset: Pixels from the bottom of the screen.
If you omit any values in the geometry string, G2 takes the missing values from defaults used by the window manager's resource manager on the target platform.
For more information see the X Windows reference documentation for the target platform.