// ITU F2005 JMA - Mandatory assignment #1
// PlotCanvas.java
// 2005-03-01 Kenn A. Thisted

import javax.microedition.lcdui.*;
import javax.microedition.midlet.*;

public class PlotCanvas extends Canvas implements CommandListener {

	public static final int NAV_UP     = -1;
	public static final int NAV_DOWN   = -2;
	public static final int NAV_LEFT   = -3;
	public static final int NAV_RIGHT  = -4;
	public static final int NAV_SELECT = -5;

    private Mandatory1 midlet;
    private Plot plot;
    
    private Command  exitCommand = new Command( "Exit", Command.EXIT, 1 );

	intArray yValues = new intArray();
	

    public PlotCanvas( Mandatory1 midlet ){
        this.midlet = midlet;
        
        addCommand( exitCommand );
        setCommandListener( this );

        plot = new Plot("Mandatory #1", yValues.toArray(), this);
    }
    
 
    protected void paint( Graphics g ){
	    plot.draw(g);
    }
    
    public void commandAction( Command c, Displayable d ){
        if( c == exitCommand ){
            midlet.exit();
        }
    }
    
    protected void keyPressed(int keyCode) {

        // supports game keys, navigator keys and numpad

	    switch(keyCode) {
	    	
	        case UP:                         	        // zoom in
	        case NAV_UP:
	        case KEY_NUM2:
	            plot.zoomIn();
	            break;
	    
	        case LEFT:                             	    // move left
	        case NAV_LEFT:
	        case KEY_NUM4:
	            plot.left();
	            break;
	    
	        case FIRE:                                  // default view
	        case NAV_SELECT:
	        case KEY_NUM5:
	            plot.center();
	            break;
	    
	        case RIGHT:                               	// move right
	        case NAV_RIGHT:
	        case KEY_NUM6:
	            plot.right();
	            break;
	    
	        case DOWN:                             	    // zoom out
	        case NAV_DOWN:
	        case KEY_NUM8:
	            plot.zoomOut();
	            break;
	    }

	    //System.out.println("Key pressed: " + keyCode + " " + (char)keyCode);
    }

}