jmathlibgui.java

JAVA 数学程序库 提供常规的数值计算程序包

package jmathlib.ui.applet;

import jmathlib.core.interpreter.Interpreter;
import jmathlib.core.interfaces.RemoteAccesible;
import jmathlib.ui.common.Console;

import java.awt.*;
import java.awt.event.*;
import java.applet.*;

/**Rudimentary interface used to test the program*/
public class JMathLibGUI extends Applet implements RemoteAccesible
{
	/**Flag storing whether the program is running as an application or an applet*/
    boolean 		runningStandalone;

	/**The area used for user input and where the answers are displayed*/
    Console 		answer;

	/**The interpreter*/
    Interpreter		interpreter;

    /**The container used by the applet / application*/
    Container 		container;

    /**string used for defining user functions*/
    String 			function;

    /**Flag storing whether each line input should be executed straight away*/
    boolean 		interactiveMode = true;

    /**Layout manager used for the components*/
    BorderLayout layout;

    /**Event Handler for intercepting window events*/
    WindowListener handler;

    /**Temporary store for function code*/
    String functionCode;

    /**Construct the applet*/
    public JMathLibGUI()
    {
    	container = this;
        runningStandalone = false;
    }

    /**Initialize the applet*/
    public void init()
    {
        container.setSize(700,400);

        layout = new BorderLayout();
        container.setLayout(layout);
        
       	//answer 			= new Console((MathLib.Interfaces.RemoteAccesible)this);
        answer          = new Console(this);

        container.add("Center", answer);

        interpreter = new Interpreter(runningStandalone, this);       
        
        interpreter.setOutputPanel(answer);
        interpreter.executeExpression("startup");
        
        // check if there is an initial command to send to the interpreter
        String startWithS = getParameter("startup");
        if (startWithS!=null)
            interpreter.executeExpression(startWithS);
        
        // get parameter for background color (e.g. ff00cc)
        try { 
            Color color = new Color(Integer.parseInt(this.getParameter("bgcolor"),16));
            if (color!=null) answer.setBackground(color);}
        catch (NumberFormatException e){ }

        // get parameter for foreground color (e.g. ffddff)
        try { 
            Color color = new Color(Integer.parseInt(this.getParameter("fgcolor"),16));
            if (color!=null) answer.setForeground(color);}
        catch (NumberFormatException e){ }  
        
    }

    /**start the applet*/
    public void start()
    {
    	answer.displayPrompt();
        answer.requestFocus();

    }

    /**Main method - allow the class to be used as an applicatoin*/
    public static void main(String[] args)
    {
        final JMathLibGUI applet = new JMathLibGUI();

		Frame frame = new Frame();
        frame.setTitle("JMathLib");

   		// add image to window
        Toolkit tk = Toolkit.getDefaultToolkit();
        Image icon = tk.getImage("MathLib/GUI/smalllogo.gif");
       	if (icon != null)
			frame.setIconImage(icon); 
        

        //create an anomynous inner class to handle window closing
        frame.addWindowListener(new WindowAdapter()
        				{
        					public void windowClosing(WindowEvent e)
        					{
        						applet.close();
        					}
        				});

        applet.runningStandalone = true;
        applet.container = frame;
        applet.init();

		//Get the size of the screen
        Dimension d = Toolkit.getDefaultToolkit().getScreenSize();

		//position the frame in the centre of the screen
        frame.setLocation((d.width - frame.getSize().width) / 2, (d.height - frame.getSize().height) / 2);

        frame.setVisible(true);
                
        //start the applet
        applet.start();
    }    
    
    /**Interpret the last command line entered*/
    public void interpretLine(String line)
    {
        String answerString = interpreter.executeExpression(line);
        answer.displayText(answerString);
        answer.displayPrompt();
    }
    
    /**Function called when the gui is being close*/
    public void close()
    {
    	interpreter.save();
    	
    	System.exit(0);
    }
}