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Re: vertical line that moves with cursor in draw widget [message #60713]

Sun, 08 June 2008 15:56

Michael Galloy
Messages: 1114
Registered: April 2006

Senior Member

cgoethel@igpp.ucla.edu wrote:
> Hello, I have a draw_widget with motion events set up. I draw a
> vertical line (using plots) which follows the cursor as it moves
> through the draw area. I can get the vertical line to follow the
> cursor easily enough - but I can't seem to figure out how to erase the
> previous lines. All the lines remain drawn. Any suggestions?
> Thanks! Cindy

Use a pixmap (created with "window, /pixmap"). All drawing that you
currently do should go to the pixmap. Then copy the pixmap to the actual
draw window (with "device, copy=r"). This copy can be done very quickly.
Finally draw your lines on that. Every time the cursor moves, copy the
pixmap again and draw the new lines.

Mike
--
www.michaelgalloy.com
Tech-X Corporation
Software Developer II

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[Message index]

		Re: vertical line that moves with cursor in draw widget By: Michael Galloy on Sun, 08 June 2008 15:56
		Re: vertical line that moves with cursor in draw widget By: Craig Markwardt on Sat, 07 June 2008 00:49
		Re: vertical line that moves with cursor in draw widget By: ben.bighair on Fri, 06 June 2008 19:51
		Re: vertical line that moves with cursor in draw widget By: Rick Towler on Fri, 06 June 2008 14:55
		Re: vertical line that moves with cursor in draw widget By: Jean H. on Fri, 06 June 2008 14:28

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