Rotator.java

package ij.plugin.filter;
import ij.*;
import ij.gui.*;
import ij.process.*;
import java.awt.*;

public class Rotator implements PlugInFilter {
    private static double angle = 15.0;
    private static boolean interpolate = true;
    private static boolean firstTime;
    private static boolean canceled;
    private ImagePlus imp;

    public int setup(String arg, ImagePlus imp) {
        this.imp = imp;
        IJ.register(Rotator.class);
        firstTime = true;
        canceled = false;
        return IJ.setupDialog(imp, DOES_ALL);
    }

    public void run(ImageProcessor ip) {
        if (canceled)
            return;
        if (firstTime) {
            GenericDialog gd = new GenericDialog("Rotate", IJ.getInstance());
            gd.addNumericField("Angle (degrees): ", angle, 1);
            gd.addCheckbox("Interpolate", interpolate);
            gd.showDialog();
            canceled = gd.wasCanceled();
            if (canceled)
                return;
            angle = gd.getNextNumber();
            if (gd.invalidNumber()) {
                IJ.error("Angle is invalid.");
                return;
            }
            interpolate = gd.getNextBoolean();
            imp.startTiming();
            firstTime = false;
        }
        ip.setInterpolate(interpolate);
        ip.rotate(angle);
    }
    
}