Re: Macro to analyze periphery rectangular areas of rotated rectangles

Posted by Roger Chang-3 on Aug 07, 2008; 1:18am
URL: http://imagej.273.s1.nabble.com/Macro-to-analyze-periphery-rectangular-areas-of-rotated-rectangles-tp3695435p3695437.html

Hi Volker,
I tried to use the run("Rotate...", "angle=33"); function, but I want the
image selection to rotate a value incorporated in a variable. Do you know
if instead it can rotate a value designated by such a variable?

Thanks!
-Roger Chang
Washington University in St. Louis BME Department: Efimov Lab

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> Hello Roger,
> there is a rotate command for rois in ImageJ. You can find it in the
> menu Edit>Selection>Rotate... The macro code to run it is
> run("Rotate...", "angle=33");
>
> This command calls a macro RotateSelection.txt that you can find in the
> ij.jar.
>
> I'm using ImageJ 1.41b but according to
> http://rsbweb.nih.gov/ij/docs/all-notes.html
> the rotate command for selections was introduced in 1.35b
>
> Best regards,
> Volker Baecker
>
> Roger Chang a écrit :
> | Dear ImageJ Listserv members,
> | I am in the middle of writing an ImageJ macro to analyze the area in
> rotated
> | image selection rectangles' periphery rectangles. What I mean by
> periphery
> | rectangles is taking each of the four sides of the original rotated
> | rectangle selection and creating four smaller, periphery rectangles that
> | "surround" the original rotated rectangle on all four sides. However,
> these
> | periphery rectangles do not extend out, but extend into the original
> rotated
> | rectangle selection area.
> |
> | I am having a lot of trouble calculating and defining these periphery
> | rectangles with trignometric calculations. If the angle is too close to
> 90
> | deg. or 0 deg., the periphery rectangles of the longer sides become
> shorter
> | or longer than the original rectangles.
> |
> | Do any of you have any other suggestions of another approach to define
> these
> | four rotated, periphery rectangles that surround the original rotated
> | rectangle? Unfortunately, I have not found any mention of a rotate
> function
> | for image selections in the ImageJ Listserv or in the macro function
> list;
> | although there are many rotate functions for an entire image.
> |
> | If any of my explanation was not clear, please feel free to reply for a
> | clarification.
> |
> | Yours truly,
> | Roger Chang
> | Washington University in St. Louis BME Department: Efimov Lab
> |
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