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Re: Points in a rectangle with an angle [message #48228 is a reply to message #48226]

Wed, 05 April 2006 09:43

K. Bowman
Messages: 330
Registered: May 2000

Senior Member

In article <1144254765.987764.323760@i39g2000cwa.googlegroups.com>,
JJMeyers2@gmail.com wrote:

> Hello,
>
> I have a problem in IDL that I was wondering if anyone has any idea how
> it can be done.
> I have a set of coordinates and I am trying to figure out how many of
> the coordinates are inside a rectangle. I know the coordinates of the 4
> edges of the rectangle but the problem is that the rectangle is at an
> angle in the x,y axis ( I know the slope). I can not just say
> coords=where((x LE xmax) AND (x GT xmin) AND (y LE ymin) AND (y GT
> ymax))
> because that will give me coordinates of a rectangle without an angle
> (parallel to the y axis).
> Is there any function in IDL that might be doing that?
>
> Thank you,
> JJM.

If you know the angle of the rectangle, rotate your coordinate system, then use
the simple comparison that you give above.

Ken Bowman

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[Message index]

		Re: Points in a rectangle with an angle By: Maarten[1] on Thu, 06 April 2006 04:37
		Re: Points in a rectangle with an angle By: Craig Markwardt on Wed, 05 April 2006 09:53
		Re: Points in a rectangle with an angle By: JJMeyers2 on Wed, 05 April 2006 10:08
		Re: Points in a rectangle with an angle By: K. Bowman on Wed, 05 April 2006 09:43
		Re: Points in a rectangle with an angle By: Rick Towler on Wed, 05 April 2006 09:58
		Re: Points in a rectangle with an angle By: David Fanning on Wed, 05 April 2006 09:48

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