package ij.plugin;
import ij.*;
import ij.process.*;

/** This plugin implements the Image/Transform/Flip Z and
    Image/Stacks/Tools/Reverse commands. */
public class StackReverser implements PlugIn {
    
    public void run(String arg) {
        ImagePlus imp = IJ.getImage();
        if (imp.getStackSize()==1) {
            IJ.error("Flip Z", "This command requires a stack");
            return;
        }
        if (imp.isHyperStack()) {
            IJ.error("Flip Z", "This command does not currently work with hyperstacks.");
            return;
        }
        flipStack(imp);
    }
    
    public void flipStack(ImagePlus imp) {
        ImageStack stack = imp.getStack();
        int n = stack.getSize();
        if (n==1)
            return;
        ImageStack stack2 = new ImageStack(imp.getWidth(), imp.getHeight(), n);
        for (int i=1; i<=n; i++) {
            stack2.setPixels(stack.getPixels(i), n-i+1);
            stack2.setSliceLabel(stack.getSliceLabel(i), n-i+1);
        }
        stack2.setColorModel(stack.getColorModel());
        imp.setStack(stack2);
        if (imp.isComposite()) {
            ((CompositeImage)imp).reset();
            imp.updateAndDraw();
        }
    }

}