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Re: Quickly Erasing lines on direct graphics images [message #46266 is a reply to message #46265]

Sat, 12 November 2005 08:31

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Richard G. French writes:

> I have a Direct Graphics question. How can I quickly erase lines that I have
> drawn in displayed images?

The standard way to do this kind of "quick erasing" is
to use a pixmap and the "Device Copy" technique. This will
be at least a 100 times faster than redrawing your image.
Here is an article that describes the technique:

http://www.dfanning.com/widget_tips/rubberband_regular.html

Cheers,

David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/

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[Message index]

		Re: Quickly Erasing lines on direct graphics images By: Richard French on Mon, 14 November 2005 05:11
		Re: Quickly Erasing lines on direct graphics images By: David Fanning on Sun, 13 November 2005 21:19
		Re: Quickly Erasing lines on direct graphics images By: Richard French on Sun, 13 November 2005 17:48
		Re: Quickly Erasing lines on direct graphics images By: Richard French on Sun, 13 November 2005 17:37
		Re: Quickly Erasing lines on direct graphics images By: David Fanning on Sat, 12 November 2005 14:22
		Re: Quickly Erasing lines on direct graphics images By: David Fanning on Sat, 12 November 2005 08:31

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