samer@0: /*
samer@0:  *	VectorEditor.java	
samer@0:  *
samer@0:  *	Copyright (c) 2001, 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.maths;
samer@0: 
samer@0: import  samer.core.*;
samer@0: import  java.awt.*;
samer@0: import  java.awt.event.*;
samer@0: import  java.util.*;
samer@0: 
samer@0: public class VectorEditor extends VectorPlotter 
samer@0: 	implements MouseListener, MouseMotionListener
samer@0: {
samer@0: 	Mat		mat;
samer@0: 	double	lasty;
samer@0: 	int		lasti;
samer@0: 
samer@0: 	public VectorEditor(Observable o, Vec s) {
samer@0: 		super(o,s);
samer@0: 		addMouseListener(this);
samer@0: 		addMouseMotionListener(this);
samer@0: 		mat=s.mat();
samer@0: 	}
samer@0: 
samer@0: 	private void handle(MouseEvent e,boolean dragging)
samer@0: 	{
samer@0: 		// get inverse mapping of position
samer@0: 		double x = xmap.inverseFromInt(e.getX());
samer@0: 		double y = ymap.inverseFromInt(height-e.getY());
samer@0: 		int    i = (int)x;
samer@0: 
samer@0: 		if (i>=0 && i<mat.width()) {
samer@0: 			if (dragging) {
samer@0: 				if (i>lasti) {
samer@0: 					for (int j=lasti+1; j<=i; j++) {
samer@0: 						double t=(j-lasti)/(float)(i-lasti);
samer@0: 						double yy = t*y + (1-t)*lasty;
samer@0: 						mat.set(1,j,yy);
samer@0: 					}
samer@0: 				} else if (i<lasti) {
samer@0: 					for (int j=lasti-1; j>=i; j--) {
samer@0: 						double t=(j-lasti)/(float)(i-lasti);
samer@0: 						double yy = t*y + (1-t)*lasty;
samer@0: 						mat.set(1,j,yy);
samer@0: 					}
samer@0: 				} else {
samer@0: 					mat.set(1,i,y);
samer@0: 				}
samer@0: 			} else {
samer@0: 				mat.set(1,i,y);
samer@0: 			}
samer@0: 			obs.notifyObservers(null);
samer@0: 			lasty=y;
samer@0: 			lasti=i;
samer@0: 		}
samer@0: 	}
samer@0: 
samer@0: 	public void mouseMoved(MouseEvent e) {}
samer@0: 	public void mouseDragged(MouseEvent e) { 
samer@0: 		int f = e.getModifiers();
samer@0: 		if ((f & InputEvent.BUTTON1_MASK)!=0) {
samer@0: 			handle(e,true); e.consume(); 
samer@0: 		}
samer@0: 	}
samer@0: 	public void mousePressed(MouseEvent e) { 
samer@0: 		int f = e.getModifiers();
samer@0: 		if ((f & InputEvent.BUTTON1_MASK)!=0) {
samer@0: 			handle(e,false); e.consume(); 
samer@0: 		}
samer@0: 	}
samer@0: 	public void mouseReleased(MouseEvent e) {}
samer@0: 	public void mouseClicked(MouseEvent e) {}
samer@0: 	public void mouseEntered(MouseEvent e) {}
samer@0: 	public void mouseExited(MouseEvent e) {}
samer@0: }