Re: Constructing line perpendicular to other line (saved in ROI manager)

Posted by Rasband, Wayne (NIH/NIMH) [E] on Mar 14, 2015; 4:38am
URL: http://imagej.273.s1.nabble.com/Constructing-line-perpendicular-to-other-line-saved-in-ROI-manager-tp5011962p5011963.html

> On Mar 13, 2015, at 6:36 PM, Mqoi Mgfsu <[hidden email]> wrote:
>
> Hi everyone.
>
> does someone know how to create (automatically) a line that is perpendicular to a previously created straight line (saved in the ROI manager) in ImageJ/Fiji? Of course, you can do it manually, but that will never be a exactly perpendicular line.
> I'm sure that there already exists a simple solution, but I just cannot find it.

The following macro creates a line perpendicular to a previously created line in the ROI Manager.

-wayne

  count = roiManager("count");
  if (count==0)
     exit("ROI Manager line selection required");
  roiManager("select", count-1);
  if (selectionType!=5)
     exit("Straight line selection required");
  run("Rotate...", "angle=90");
  roiManager("Add");
  roiManager("Show All without labels");

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