samer@0: /*
samer@0:  *	Copyright (c) 2000, Samer Abdallah, King's College London.
samer@0:  *	All rights reserved.
samer@0:  *
samer@0:  *	This software is provided AS iS and WITHOUT ANY WARRANTY; 
samer@0:  *	without even the implied warranty of MERCHANTABILITY or 
samer@0:  *	FITNESS FOR A PARTICULAR PURPOSE.
samer@0:  */
samer@0: 
samer@0: package samer.tools;
samer@0: import java.awt.*;
samer@0: import java.util.*;
samer@0: 
samer@0: /**
samer@0: 		Things to add:
samer@0: 		UI for LinearMap used in MatrixImageSource
samer@0: 		vertical and horizontal scaling:
samer@0: 			cell size,
samer@0: 			vertical stretch
samer@0: 			vertical sweep version?
samer@0: 			cooperate with MatrixImageSource for efficiency:
samer@0: 			vertical strips rather than scan lines
samer@0: 
samer@0:  */
samer@0: 
samer@0: public class ImageVTrace extends ImageTraceBase
samer@0: {
samer@0: 	private	int	y=0;
samer@0: 
samer@0: 	public ImageVTrace( ImageSourceBase i, Observable o) { super(i,o); }
samer@0: 
samer@0: 	public void next()
samer@0: 	{ 
samer@0: 		ip.sendPixels(); 
samer@0: 
samer@0: 		// img is m by n
samer@0: 		
samer@0: 		if (!sc) {
samer@0: 			graphics.drawImage( img, 0, y, null);  
samer@0: 		} else {
samer@0: 			if (stretch) {
samer@0: 				graphics.drawImage( img, 0, y, width, sy, null); 
samer@0: 			} else {
samer@0: 				graphics.drawImage( img, 0, y, sx, sy, null); 
samer@0: 			}
samer@0: 		}
samer@0: 
samer@0: 		// Scroll DOWN		
samer@0: 		y-=sy;
samer@0: 		if (scroll) while (y<0) { 
samer@0: 			graphics.copyArea(0,0,width,height-scrollStep-1,0,scrollStep);
samer@0: 			y+=scrollStep;
samer@0: 		}
samer@0: 		else if (y<0) y=height-1; 
samer@0: 
samer@0: /*
samer@0: 		// Scroll UP
samer@0: 		y+=sy;
samer@0: 		if (scroll) while (y>=height) { 
samer@0: 			graphics.copyArea(0,scrollStep,width,height-1,0,-scrollStep);
samer@0: 			y-=scrollStep;
samer@0: 		}
samer@0: 		else if (y>=height) y=0; 
samer@0:  */
samer@0: 
samer@0: 	}
samer@0: 
samer@0: 	public Dimension getPreferredSize() {
samer@0: 		return new Dimension(cx*ip.getWidth(),cy*256);
samer@0: 	}
samer@0: }