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Re: Area intersection of two trapezoids with given coordinates [message #56856 is a reply to message #56787]

Sun, 18 November 2007 19:27

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

mrosimmel@gmail.com writes:

> I was wondering if there is a function in IDL that I can find the
> intersection area of two trapezoids with given corner coordinates.
> Briefly I have two trapezoids where the first one has corners of
> (x1,y1), (x2,y2), (x3,y3), (x4,y4) and the second one has corners of
> (a1,b1), (a2,b2), (a3,b3), (a4,b4)...I know ARCGIS has such functions
> (like union/intersection).. If not could anyone have an idea how can I
> do it in IDL?

If these trapezoids have to do, for example, with
images, you can use POLYFILLV to get a list of
all the vertices inside them. Then you can perform
set operations on the vertices:

http://www.dfanning.com/tips/set_operations.html

Cheers,

David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Sepore ma de ni thui. ("Perhaps thou speakest truth.")

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[Message index]

		Area intersection of two trapezoids with given coordinates By: mrosimmel on Fri, 16 November 2007 18:44
		Re: Area intersection of two trapezoids with given coordinates By: Bringfried Stecklum on Tue, 20 November 2007 03:22
		Re: Area intersection of two trapezoids with given coordinates By: mrosimmel on Tue, 27 November 2007 09:21
		Re: Area intersection of two trapezoids with given coordinates By: David Fanning on Sun, 18 November 2007 19:31
		Re: Area intersection of two trapezoids with given coordinates By: David Fanning on Sun, 18 November 2007 19:27
		Re: Area intersection of two trapezoids with given coordinates By: Vince Hradil on Sun, 18 November 2007 19:22

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