/*
 * @(#)/ZSliceVolumeFilter.java	1.3 96/03/30 by Andrew Barclay abb@nuccard.eushc.org
 *
 * Copyright (c) 1995 Andrew B. Barclay All Rights Reserved.
 */

import java.awt.image.ColorModel ;
import java.awt.Point ;
import java.awt.Rectangle ;

import SliceVolumeFilter ;

/**
 * An ImageFilter class for sliceing volume images.
 * This class extends the basic ImageFilter Class to extract a given
 * slice of an existing Volume and provide a source for a
 * new image containing just the extracted slice.  It is meant to
 * be used in conjunction with a FilteredImageSource object to produce
 * sliced versions of existing volumes.
 *
 * This one's easy.
 *
 * @see CropImageFilter
 * @see FilteredImageSource
 * @see ImageFilter
 * @see SliceVolumeFilter
 *
 * @version	1.1 95/12/06
 * @author 	Andrew Barclay
 */

public class ZSliceVolumeFilter extends SliceVolumeFilter {
    boolean debug = false ;

    /**
     * Construct a SliceVolumeFilter that extracts a slice of the source
     * Volume specified by the ul, ll and ur parameters.
     * @param srcSlices[] the array of x,y positions of the source image slices
     * @param volWidth the width of the source volume
     * @param volHeight the height of the source volume
     * @param slice the slice number to be extracted
     * @param width the width of the slice to be extracted
     * @param height the height of the slice to be extracted
     */
    public ZSliceVolumeFilter( Point srcSlices[], int volWidth, int volHeight,
		double slice, int width, int height ) {
	super( srcSlices, volWidth, volHeight, slice, width, height ) ;
	type = 'Z' ;
    }

    /**
     * Determine if the delivered pixels intersect the slice to
     * be extracted and pass through only that subset of pixels that
     * appear in the output slice.
     */
    public void setPixels(int x, int y, int w, int h,
			  ColorModel model, byte pixels[], int off,
			  int scansize) {
	long ct = System.currentTimeMillis() ;
	Rectangle sr = new Rectangle( x, y, w, h ) ;
	int sz1 = firstZSlice( sr ) ;
	int sz2 = lastZSlice( sr ) ;
	/*
	dbg( "sr="+sr+" sz1="+sz1+" sz2="+sz2 ) ;
	dbg( "off="+off+" scansize="+scansize+" type="+type+" slice="+slice ) ;
	*/

	// implement this properly later -- for now, just take orthogonal
	// slices.
	int islice = (int)( 0.5 + slice ) ;
	if( islice >= sz1 && islice < sz2 ) {
	    int x1 = srcSlices[islice].x ;
	    int y1 = srcSlices[islice].y ;
	    int dx = (x1>x) ? x1-x : 0 ;
	    int dy = (y1>y) ? y1-y : 0 ;
	    Rectangle ir = sr.intersection( 
		new Rectangle( x1, y1, width, height )
	    ) ;
	    dbg( "zslice="+islice+" ir="+ir ) ;
	    dbg( "sr="+sr+" sz1="+sz1+" sz2="+sz2 ) ;
	    if( ir.width > 0 && ir.height > 0 ) {
		consumer.setPixels( ir.x-x1, ir.y-y1, ir.width, ir.height,
		    model, pixels, off + dx + dy*scansize, scansize ) ;
		dbg( "byte time= "+(System.currentTimeMillis()-ct)+" ms.\n" ) ;
	    } else {
		Rectangle dr = new Rectangle( x1, y1, voldims[0], voldims[1] ) ;
		dbg( "Error: h<0, dr="+dr ) ;
	    }
	}
    }
    
    public void setPixels(int x, int y, int w, int h,
			  ColorModel model, int pixels[], int off,
			  int scansize) {
	long ct = System.currentTimeMillis() ;
	Rectangle sr = new Rectangle( x, y, w, h ) ;
	int sz1 = firstZSlice( sr ) ;
	int sz2 = lastZSlice( sr ) ;
	/*
	dbg( "sr="+sr+" sz1="+sz1+" sz2="+sz2 ) ;
	dbg( "off="+off+" scansize="+scansize+" type="+type+" slice="+slice ) ;
	*/

	// implement this properly later -- for now, just take orthogonal
	// slices.
	int islice = (int)( 0.5 + slice ) ;
	if( islice >= sz1 && islice < sz2 ) {
	    int x1 = srcSlices[islice].x ;
	    int y1 = srcSlices[islice].y ;
	    int dx = (x1>x) ? x1-x : 0 ;
	    int dy = (y1>y) ? y1-y : 0 ;
	    Rectangle ir = sr.intersection( 
		new Rectangle( x1, y1, width, height )
	    ) ;
	    dbg( "zslice="+islice+" ir="+ir ) ;
	    dbg( "sr="+sr+" sz1="+sz1+" sz2="+sz2 ) ;
	    if( ir.width > 0 && ir.height > 0 ) {
		consumer.setPixels( ir.x-x1, ir.y-y1, ir.width, ir.height,
		    model, pixels, off + dx + dy*scansize, scansize ) ;
		dbg( "int time= "+(System.currentTimeMillis()-ct)+" ms.\n" ) ;
	    } else {
		Rectangle dr = new Rectangle( x1, y1, voldims[0], voldims[1] ) ;
		dbg( "Error: h<0, dr="+dr ) ;
	    }
	}
    }
    
}