samer@0: /*
samer@0:  *	MatEditor.java	
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.maths;
samer@0: 
samer@0: import java.awt.*;
samer@0: import java.awt.event.*;
samer@0: import java.util.*;
samer@0: import samer.core.*;
samer@0: import samer.core.types.*;
samer@0: import samer.core.util.*;
samer@0: 
samer@0: /**
samer@0: 	This is a mouse event handler that interprets mouse clicks
samer@0: 	to edit a matrix. It assumes that it is handling mouse
samer@0: 	events for a component the contains some representation of the 
samer@0: 	matrix that is arranged in rows and columns, just like the
samer@0: 	matrix itself (it doesn't have to be an image). The window
samer@0: 	relative coordinates are simply mapped to a matrix element 
samer@0: 	address.
samer@0:   */
samer@0: 
samer@0: public class MatEditor extends MouseAdapter 
samer@0: 	implements MouseMotionListener, Agent
samer@0: {
samer@0: 	Component	canvas;
samer@0: 	Mat			M;
samer@0: 	VDouble		setto;
samer@0: 	Observable	obs;
samer@0: 	int			lasti=-1, lastj=-1;
samer@0: 	double		dragval=0;
samer@0: 	boolean		add=false;
samer@0: 	boolean		b1down=false;
samer@0: 
samer@0: 	public MatEditor( Mat m, Component c, Observable v, Viewer vwr)
samer@0: 	{
samer@0: 		M=m; 
samer@0: 		canvas=c;
samer@0: 		setto = new VDouble("button1",1,0);
samer@0: 		canvas.addMouseListener(this);
samer@0: 		canvas.addMouseMotionListener(this);
samer@0: 		obs=v;
samer@0: 
samer@0: 		vwr.exposeCommands(this);
samer@0: 	}
samer@0: 
samer@0: 	public void getCommands(Agent.Registry r) { r.add("add",add); }
samer@0: 	public void execute(String cmd, Environment env) {	
samer@0: 		add=X._bool(env.datum(),!add); 
samer@0: 	}
samer@0: 
samer@0: 	private void handle(MouseEvent e)
samer@0: 	{
samer@0: 		// get position in matrix
samer@0: 		int i = (M.height()*e.getY())/canvas.getHeight();
samer@0: 		int j = (M.width()*e.getX())/canvas.getWidth();
samer@0: 
samer@0: 		// check bounds
samer@0: 		if (i<0 || i>=M.height()) return;
samer@0: 		if (j<0 || j>=M.width()) return;
samer@0: 
samer@0: 		// correct for vertical flip
samer@0: 		i=M.height()-i-1;
samer@0: 
samer@0: 		if (!add) {
samer@0: 			if (i==lasti && j==lastj) return;
samer@0: 			M.set(i,j,dragval);
samer@0: 		} else M.set(i,j,M.get(i,j)+dragval);
samer@0: 
samer@0: 		lasti=i;
samer@0: 		lastj=j;
samer@0: 		obs.notifyObservers(new Point(j,i)); // Point as x,y into image raster
samer@0: 	}
samer@0: 
samer@0: 	public void mouseMoved(MouseEvent e) {}
samer@0: 	public void mouseDragged(MouseEvent e) { if (b1down) { handle(e); e.consume(); } }
samer@0: 	public void mousePressed(MouseEvent e)
samer@0: 	{
samer@0: 		int f = e.getModifiers();
samer@0: 
samer@0: 		if ((f & InputEvent.BUTTON1_MASK)!=0) b1down=true;
samer@0: 		if (b1down) {
samer@0: 
samer@0: 			// if ((f&(InputEvent.BUTTON2_MASK|InputEvent.BUTTON3_MASK))==0) {
samer@0: 			if (!e.isControlDown()) {
samer@0: 				dragval=setto.value;
samer@0: 			} else {
samer@0: 				dragval=add ? -setto.value : 0;
samer@0: 				// canvas.addMouseListener(this); // to catch mouse up!
samer@0: 				// b2down=true;
samer@0: 			}
samer@0: 
samer@0: 			lasti=lastj=-1;
samer@0: 			handle(e);
samer@0: 			e.consume();
samer@0: 
samer@0: 		}	
samer@0: 	}
samer@0: 
samer@0: 	public void mouseReleased(MouseEvent e)
samer@0: 	{
samer@0: 		int f = e.getModifiers();
samer@0: 
samer@0: 		if ((f & InputEvent.BUTTON1_MASK)!=0) {
samer@0: 			// button 1 up - stop all dragging
samer@0: 			b1down=false;
samer@0: 
samer@0: 			//if (b2down) {
samer@0: 			//	canvas.removeMouseListener(this);
samer@0: 			//	b2down=false;
samer@0: 			//}
samer@0: 			e.consume();
samer@0: 		} /* else {
samer@0: 
samer@0: 			// something else up
samer@0: 			if (b1down) {
samer@0: 
samer@0: 				if ((f&(InputEvent.BUTTON2_MASK|InputEvent.BUTTON3_MASK))!=0) {
samer@0: 					// button 2 up
samer@0: 					dragval=setto.value;
samer@0: 					b2down=false;
samer@0: 					canvas.removeMouseListener(this);
samer@0: 					handle(e);
samer@0: 				} 
samer@0: 				e.consume();
samer@0: 
samer@0: 			} else {
samer@0: 				Shell.print("button up while button 1 not down?");
samer@0: 			}
samer@0: 		} */
samer@0: 	}
samer@0: 
samer@0: 	public void detach() { setto.dispose(); }
samer@0: }