import awb.*;
import java.awt.*;
import java.awt.event.*;

public class Fence extends java.applet.Applet implements ActionListener
{
    TextField mInstruct;
    Label lLength;
    DoubleField gLength; 
    Button bSimulate, bDisplay;                                                                                          
    TextArea mResults;
    int k;
   
    public void init()
    {   
        lLength = new Label("Length");
        mInstruct = new TextField(70);
        mInstruct.setText("Enter length of fence, the press Simulate or Display");
        gLength = new DoubleField(10);
        bSimulate = new Button("Simulate");
        bDisplay = new Button("Display");
        mResults = new TextArea(25,60);
        bSimulate.addActionListener(this);
        bDisplay.addActionListener(this);
        add(mInstruct);
        add(lLength);
        add(gLength);
        add(bSimulate);
        add(bDisplay);
        add(mResults);
    }           
        
    public void actionPerformed(ActionEvent event)
    {
        Object cause = event.getSource();
        double fenceLength;
        
        if (cause == bSimulate)
        {
            fenceLength = gLength.getDouble();
            fenceTable(fenceLength);
        }
        if (cause == bDisplay)
        {
            fenceLength = gLength.getDouble();
            fencePlot(fenceLength);
        }
    }
    
    void fenceTable(double fenceLength) 
    {
        double area, x, y;
        x = 0.0;
        y = fenceLength - 2.0 * x;
        mResults.setText("Fence Optimization Table\n");
        while (y >= 0.0)
        {
            area = x * y;
            mResults.append("x = "+x+"  y = "+y+"  area = "+area+"\n");
            x = x + 1.0;
            y = fenceLength - 2.0 * x;
        }
    }
    
    void fencePlot(double fenceLength) 
    {
        double area, x, y;
        x = 0.0;
        y = fenceLength - 2.0 * x;
        mResults.setText("Fence Optimization Plot\n");
        while (y >= 0.0)
        {
            area = x * y;
            mResults.append(x+"\t"+plotString(area)+"\n");
            x = x + 1.0;
            y = fenceLength - 2.0 * x;
        }
    }
    
    String plotString(double area)
    {
        String s = "";
        while (area > 0)
        {
            s = s + "*";
            area = area - 5.0;
        }
        return s;
    }        
}