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Re: How to get the position of mouse [message #32739 is a reply to message #32737]

Tue, 05 November 2002 05:27

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

lily_zhang (fengliza@sina.com) writes:

> I display an image on the screen first, and then intend to get the
> coordinate of mouse when I depress the left button of it. Would you
> tell me how to realize it?

In a regular graphics window, you would do something like
this:

Window
TV, image
Cursor, x, y, /Down
IF !Mouse EQ 1 THEN Print, 'You pressed LEFT button.'

But, typically, if you are asking for user input, you
will be doing this in a draw widget window, in which case
you will turn button events on for the window, and then
process the event in an event handler like this:

possibleEvents = ['DOWN', 'UP', 'MOTION']
whichButton = ['NONE', 'LEFT', 'MIDDLE', 'NONE', 'RIGHT']

thisEvent = possibleEvents[event.type]
buttonPressed = whichButton[event.press]
IF thisEvent EQ 'DOWN' THEN Print, 'You pressed the ' + $
buttonPressed + ' button down.'

Cheers,

David
--
David W. Fanning, Ph.D.
Fanning Software Consulting, Inc.
Phone: 970-221-0438, E-mail: david@dfanning.com
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Toll-Free IDL Book Orders: 1-888-461-0155

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		Re: How to get the position of mouse By: Roberto Monaco on Tue, 05 November 2002 06:04
		Re: How to get the position of mouse By: David Fanning on Tue, 05 November 2002 05:27

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