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Re: automatic placement of legend in 2-D graph [message #58492 is a reply to message #58285]

Wed, 30 January 2008 14:44

Jean-Paul Davis
Messages: 17
Registered: March 1998

Junior Member

I thought I would share this in case someone finds it useful. After
spending a shameful amount of time barking up wrong trees, I finally
hit on a very simple solution to (semi-) automatic legend placement:

1. determine the legend's boundaries in device coordinates (i.e.,
pixels in the window)
2. hide the legend and redraw
3. get the window's image_data property
4. loop through possible legend positions (in device coordinates) to
find one that has the fewest (preferably zero) non-background-color
pixels in the region of the image defined by the legend boundaries
5. translate the legend accordingly, unhide it, and redraw

Jean-Paul

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[Message index]

		automatic placement of legend in 2-D graph By: Jean-Paul Davis on Mon, 21 January 2008 12:26
		Re: automatic placement of legend in 2-D graph By: Jean-Paul Davis on Thu, 24 January 2008 16:31
		Re: automatic placement of legend in 2-D graph By: Jean-Paul Davis on Wed, 30 January 2008 14:44
		Re: automatic placement of legend in 2-D graph By: Jean-Paul Davis on Thu, 24 January 2008 11:30
		Re: automatic placement of legend in 2-D graph By: David Fanning on Wed, 30 January 2008 14:49

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