xevi-v2 : X implementation of EVI camera controler (version 2)
	1999/05/13 : rev. 1.12 by HAO

Xevi-v2 is a camera controler using a mouse. You can control pan and tilt
angles and zoom ratio of a EVI camera (EVI-G20 or EVI-D30) by dragging
cursors displayed on the xevi-v2 window.

When you invoke xevi-v2, a window which has two (green and red) cursors
will be opened. The relative position of the green cursor (named pan/tilt
cursor) on the window shows the current pan(x)/tilt(y) angles of the camera
respect to their maximum values, and similarly the red cursor (named zoom
cursor) shows the current zoom ratio. If the green cursor is on the center
of the window, the camera is to the default position (pan = 0, tilt = 0). 

Dragging these cursors reflects motion on the camera. To move these
cursors, click an appropiate mouse button on the window and move the
mouse with the mouse button pushed. The left mouse button responds to
the pan/tilt cursor, which responds to pan and tilt angles of the camera,
and the middle mouse button responds to the zoom cursor, which responds 
to zoom ratio of the camera. The zoom cursor can move only up and down.
In addition, the right button is used to open menu.

You don't need to directly click the pan/tilt cursor or the zoom cursor
to drag. If you click the left or middle button anywhere on the window
and move the mouse, those cursors move relatively and camera operation
is be performed. This is effective until the mouse button is released,
even if the mouse cursor goes out of the window. If you want to directly
move the pan/tilt or zoom cursor to the place you clicked, push the SHIFT
key with each mouse button.

The magnitude of motion of them per motion of the mouse cursor depend
on the zoom value. When the camera zooms up, motion of the pan/tilt
cursor get soft. And when the camera zooms down, motion of it get hard.
This function also can be turned off (with "-a off" option when invoking
this or from menu which is opened with the right button click).

----
xevi-v2 menu:

Camera change:		change the target camera.
Command interval:	change an internal interval time in which one
			operation command is sent to RS-232C port.
Pan-tilt sensitivity:	change mouse sensitivity on pan/tilt operation.
			(on dragging the green cursor)
			also can have the auto sensitivity change (as
			described before) turn off or on.
Zoom sensitivity:	change mouse sensitivity on zoom operation.
			(on dragging the red cursor)
Reset:			have the target camera return to the home position
			(pan/tilt = center, zoom = minimum)
Quit:			quit xevi-v2.


- written by HAO in (perhaps bad) English, at May 15 1999.