view src/samer/tools/Trace.java @ 8:5e3cbbf173aa tip

Reorganise some more

/*
 *	Copyright (c) 2000, Samer Abdallah, King's College London.
 *	All rights reserved.
 *
 *	This software is provided AS iS and WITHOUT ANY WARRANTY;
 *	without even the implied warranty of MERCHANTABILITY or
 *	FITNESS FOR A PARTICULAR PURPOSE.
 */

package samer.tools;
import  samer.core.*;
import  samer.core.util.*;
import  samer.core.util.heavy.*;
import  java.awt.*;
import  java.awt.event.*;
import  java.awt.image.*;
import  java.util.*;

/**
	Displays values of a single real variable as a
	trace: value vs time. The trace can be set to scroll
	or wrap when it reaches the right-hand edge.

 */

public class Trace extends VCanvas implements Observer, Agent, Task
{
	protected int		x1, x2, dx, j0=-1;
	protected IMap	map;

	boolean	scroll=false;
	boolean	axisFlag;
	Color		axisColor;
	VMap		vmap;

	public Trace()
	{
		dx = Shell.getInt("scrollStep",4);
		scroll = Shell.getBoolean("scroll", false);
		axisColor=Shell.getColor("axesColor",Color.gray);
		axisFlag=Shell.getBoolean("axesFlag",false);

		x1=0; x2=0;
		vmap = new VMap(new LinearMap(-1,1));
		vmap.addObserver(this);
		exposeCommands(this);
		exposeCommands(vmap);
		map = vmap.getMap();
	}

	public IMap getMap() { return vmap.getMap(); }

	public void setScroll(boolean f) { scroll=f; }
	public void setStep(int s) { dx=s; }
	public void setAxisColor(Color c) { axisColor=c; }
	public void setAxis(boolean f) {
		j0= -1; axisFlag=f; if (axisFlag) computeAxisPos();
	}

	public void drawAxis(Graphics g) 	{
		g.setColor(axisColor);
		g.drawLine(0,j0,width-1,j0);
	}

	public void paint(Graphics g) { if (j0>=0) drawAxis(g);	}
	public void clear(Graphics g) { super.clear(g); paint(g); }

	public void dispose() { vmap.dispose(); }
	public void starting() {}
	public void stopping() {}
	/**
		 moves the trace along one time step, by preparing
		space for the next bit of plotting.
	*/
	public void run()
	{
		x1=x2; x2+=dx;
		// graphics.setColor(getBackground());

		if (x2>=width) {
			if (scroll) { // scroll just enough
				int st=1+x2-width;
				graphics.copyArea(st,0,width-st,height,-st,0);
				x1-=st; x2-=st;
			} else { // fly back
				// blank out dead space at right
     				// and also first column of pixels at left
				graphics.clearRect(x1+1,0,width-x1-1,height);
				graphics.clearRect(0,0,1,height);
				x1=0; x2=dx;
			}
		}

		// clear rectangle and draw axis
		graphics.clearRect(x1+1,0,dx,height);
		if (j0>=0) {
			graphics.setColor(axisColor);
			graphics.fillRect(x1,j0,dx+1,1);
		}
	}


	public void update(Observable o, Object arg)
	{
		if (o==vmap) {
			if (arg==VMap.NEW_MAP) map=vmap.getMap();
			if (axisFlag) computeAxisPos();
			clear(getGraphics());
		}
  	}

	public Dimension getPreferredSize() { return new Dimension(256,64); }
	protected void sized() {
		map.setIntRange(height);
		if (axisFlag) computeAxisPos();
	}

	public void getCommands(Registry r) {
		r.add("scroll",scroll).add("axis",axisFlag).add("step");
	}
	public void execute(String cmd, Environment env) throws Exception {
		if (cmd.equals("scroll")) { scroll = X._bool(env.datum(),!scroll); }
		else if (cmd.equals("axis")) { setAxis(X._bool(env.datum(),!axisFlag));	}
		else if (cmd.equals("step")) { dx = X._int(env.datum(),dx); }
	}

	private void computeAxisPos() {
		j0 = height-map.toInt(0.0);
		if (map.wasClipped()) j0=-1;
	}
}