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ImageJ Angle Measurement Tool: get the lengths of the two lines

I apologize if this is a rudimentary question, but I am unable to find an answer in the ImageJ documentation and am a new user. In ImageJ, the angle measurement tool outputs the angle between the two lines, but is there a way to get the lengths of those two lines?

I analyze > set measurements, but do not see an option for length.

Solution

  • Below please find an ImageJ-macro that should do what you want:

    //imagej-macro "anglePlus" (Herbie G., 07. Jan. 2025)
requires("1.54m");
if (selectionType!=8) exit("Angle-selection required");
run("Set Measurements...","display redirect=None decimal=3");
ttl=split(getTitle(),".");
getSelectionCoordinates(x,y);
setResult("Label",nResults,ttl[0]);
setResult("Angle",nResults-1,getValue("Angle"));
setResult("Length-1",nResults-1,pyth(x[1]-x[0],y[1]-y[0]));
setResult("Length-2",nResults-1,pyth(x[1]-x[2],y[1]-y[2]));
exit();
function pyth(x,y) { return sqrt(x*x+y*y); }
//imagej-macro "anglePlus" (Herbie G., 07. Jan. 2025)

    Length-1 is that of the first drawn line. Both lengths are in pixels.