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


/** This plugin implements the Image/Rotate/Arbitrarily command. */
public class Rotator implements ExtendedPlugInFilter, DialogListener {
	private int flags = DOES_ALL|SUPPORTS_MASKING|PARALLELIZE_STACKS;
	private static double angle = 15.0;
	private static boolean fillWithBackground;
	private static boolean enlarge;
	private static int gridLines = 1;
	private ImagePlus imp;
	private int bitDepth;
	private boolean canEnlarge;
	private boolean isEnlarged;
	private GenericDialog gd;
	private PlugInFilterRunner pfr;
	private String[] methods = ImageProcessor.getInterpolationMethods();
	private static int interpolationMethod = ImageProcessor.BILINEAR;

	public int setup(String arg, ImagePlus imp) {
		this.imp = imp;
		if (imp!=null) {
			bitDepth = imp.getBitDepth();
			Roi roi = imp.getRoi();
			Rectangle r = roi!=null?roi.getBounds():null;
			canEnlarge = r==null || (r.x==0&&r.y==0&&r.width==imp.getWidth()&&r.height==imp.getHeight());
		}
		return flags;
	}

	public void run(ImageProcessor ip) {
		if(enlarge && gd.wasOKed()) synchronized(this) {
			if (!isEnlarged) {
				enlargeCanvas();
				isEnlarged=true;
			}
		}
		if (isEnlarged) {	//enlarging may have made the ImageProcessor invalid, also for the parallel threads
			int slice = pfr.getSliceNumber();
			if (imp.getStackSize()==1)
				ip = imp.getProcessor();
			else
				ip = imp.getStack().getProcessor(slice);
		}
		ip.setInterpolationMethod(interpolationMethod);
		if (fillWithBackground) {
			Color bgc = Toolbar.getBackgroundColor();
			if (bitDepth==8)
				ip.setBackgroundValue(ip.getBestIndex(bgc));
			else if (bitDepth==24)
				ip.setBackgroundValue(bgc.getRGB());
		} else
			ip.setBackgroundValue(0);
		ip.rotate(angle);
		if (!gd.wasOKed())
			drawGridLines(gridLines);
		if (isEnlarged && imp.getStackSize()==1) {
			imp.changes = true;
			imp.updateAndDraw();
			Undo.setup(Undo.COMPOUND_FILTER_DONE, imp);
		}
	}

	void enlargeCanvas() {
		imp.unlock();
		if (imp.getStackSize()==1)
			Undo.setup(Undo.COMPOUND_FILTER, imp);
		IJ.run("Select All");
		IJ.run("Rotate...", "angle="+angle);
		Roi roi = imp.getRoi();
		Rectangle r = roi.getBounds();
		if (r.width