Plugins that don't run from "Compile and Run..." ???

Posted by Bill Mohler on Apr 06, 2009; 8:57pm
URL: http://imagej.273.s1.nabble.com/Plugins-that-don-t-run-from-Compile-and-Run-tp3693072.html

I am hoping to make a modified version of HyperStackReducer, a plugin
that is bundled with and installed in the current version of ImagJ.

When I find the source code at
http://rsb.info.nih.gov/ij/docs/source/ij/plugin/HyperStackReducer.java.html 
and copy the code and save it in a file called HyperStackReducer.java,
I get no errors, but nothing happens.

Running the same plugin from the Image>Hyperstacks>Reduce
Dimensionality... menu, however, it works exactly as expected from
the code.

The opening lines of the plugin are:

package ij.plugin;
import ij.*;
import ij.gui.*;
import ij.process.*;
import ij.measure.Calibration;
import java.awt.*;
import java.util.Vector;

/** Implements the Image/HyperStacks/Reduce Dimensionality command. */
public class HyperStackReducer implements PlugIn, DialogListener {
     ImagePlus imp;
     int channels1, slices1, frames1;
     int channels2, slices2, frames2;
     double imageSize;
     static boolean keep = true;
   
     /** Default constructor */
     public HyperStackReducer() {
     }

     /** Constructs a HyperStackReducer using the specified source image. */
     public HyperStackReducer(ImagePlus imp) {
         this.imp = imp;
     }

     public void run(String arg) {
         imp = IJ.getImage();
         if (!(imp.isHyperStack() || imp.isComposite())) {
             IJ.error("Reducer", "HyperStack required");
             return;
         }
         int width = imp.getWidth();
.
.
.

I have tried a few variations to the code including
     public void run(String arg) {
        imp = ij.WindowManager.getCurrentImage();
...
but get the same result.
It seems that the plugin is not even executing, because running it
from the installed menu command gives an error if there is no image
open or if the current image is not of the correct type.  My efforts
with "Compile and Run..." don't even give the errors in such
situations.

Am I un aware or forgetting some magic that's needed to get a plugin
to execute on the current image?  I am still quite new to java code,
but I can't find what I'm missing.  Are the constructors the problem?

Thanks for any help!
Bill


--
William A. Mohler
Associate Professor
Dept. of Genetics and Developmental Biology
University of Connecticut Health Center
MC-3301
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Farmington, CT   06030-3301

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