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

/** The plugin implements the Image/Stacks/Tools/Montage to Stack command.
	It creates a w*h image stack from an wxh image montage.
	This is the opposite of what the "Make Montage" command does.
	2010.04.20,TF: Final stack can be cropped to remove border around frames.
*/
public class StackMaker implements PlugIn {
	private static int w=2, h=2, b=0;

	public void run(String arg) {
		ImagePlus imp = WindowManager.getCurrentImage();
		if (imp==null)
			{IJ.noImage(); return;}
		if (imp.getStackSize()>1)
			{IJ.error("This command requires a montage"); return;}
		GenericDialog gd = new GenericDialog("Stack Maker");
		gd.addNumericField("Images_per_row: ", w, 0);
		gd.addNumericField("Images_per_column: ", h, 0);
		gd.addNumericField("Border width: ", b, 0);
		gd.showDialog();
		if (gd.wasCanceled())
			return;
		w = (int)gd.getNextNumber();
		h = (int)gd.getNextNumber();
		b = (int)gd.getNextNumber();
		ImageStack stack = makeStack(imp.getProcessor(), w, h, b);
		new ImagePlus("Stack", stack).show();
	}
	
	public ImageStack makeStack(ImageProcessor ip, int w, int h, int b) {
		int stackSize = w*h;
		int width = ip.getWidth()/w;
		int height = ip.getHeight()/h;
		ImageStack stack = new ImageStack(width, height);
		for (int y=0; y<h; y++)
			for (int x=0; x<w; x++) {
				ip.setRoi(x*width, y*height, width, height);
				stack.addSlice(null, ip.crop());
			}
		if (b>0) { 
			int cropwidth = width-b-b/2;
			int cropheight = height-b-b/2;
			StackProcessor sp = new StackProcessor(stack,ip); 
			stack = sp.crop(b, b, cropwidth, cropheight);
		}
		return stack;
	}	 
}