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

public class SimpleGraph2 extends Applet
{
   String theFunction;
   Parser theParser;
   Graph theGraph;

   Button    Okay = new Button("Okay");
   TextField editF = new TextField(25);

   double xMin, xMax, yMin, yMax;

   public void init()
   {
      theFunction = super.getParameter("function");
      xMin = Double.valueOf(super.getParameter("xmin")).doubleValue();
      xMax = Double.valueOf(super.getParameter("xmax")).doubleValue();
      yMin = Double.valueOf(super.getParameter("ymin")).doubleValue();
      yMax = Double.valueOf(super.getParameter("ymax")).doubleValue();
      theParser = new Parser(1);
      theParser.defineVariable(1,"x");
 
      editF.setText(theFunction);
      Panel row = new Panel();
      row.setLayout(new FlowLayout());
      row.add(editF);
      row.add(Okay);

      setLayout(new BorderLayout());
      add("South", row);

      theGraph = new Graph(theFunction, theParser,
                           xMin, xMax, yMin, yMax, 
                           Color.blue, size());
    }

   public void paint(Graphics g)
   {
       theGraph.drawAxis(g, Color.red);
       theGraph.drawGraph(g);
   }

   public boolean action(Event e, Object arg)
   {
      if (e.target instanceof Button)
      {
         theFunction = editF.getText();
         theGraph = new Graph(theFunction, theParser,
                              xMin, xMax, yMin, yMax, 
                              Color.blue, size());
         repaint();
         return true;
      }
      return false;
   }
}