package grafica;

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

public class GraficaApplet extends Applet {
     MiCanvas canvas;
  boolean isStandalone = false;
  Panel panel1 = new Panel();
  Panel panel2 = new Panel();
  Panel panel3 = new Panel();
  Panel panel4 = new Panel();
  FlowLayout flowLayout1 = new FlowLayout();
  FlowLayout flowLayout2 = new FlowLayout();
  FlowLayout flowLayout3 = new FlowLayout();
  BorderLayout borderLayout1 = new BorderLayout();
  BorderLayout borderLayout2 = new BorderLayout();
  Label label1 = new Label();
  Choice chGases = new Choice();
  Label label2 = new Label();
  TextField tTemperatura = new TextField();
  Button btnGrafica = new Button();
  Button btnBorrar = new Button();

  //Construct the applet
  public GraficaApplet() {
  }

  //Initialize the applet
  public void init() {
    try { jbInit(); } catch (Exception e) { e.printStackTrace(); }
  }

  //Component initialization
  public void jbInit() throws Exception{
     int ancho = Integer.parseInt(this.getParameter("WIDTH"));
     int alto = Integer.parseInt(this.getParameter("HEIGHT"));
     this.setSize(new Dimension(ancho, alto));
     canvas=new MiCanvas();
    panel1.setBackground(Color.lightGray);
    panel4.setBackground(Color.gray);
    panel1.setLayout(borderLayout1);
    panel4.setLayout(flowLayout3);
    panel3.setLayout(flowLayout2);
    panel2.setLayout(flowLayout1);
    flowLayout1.setVgap(1);
    flowLayout2.setVgap(1);
    flowLayout3.setVgap(1);
    this.setLayout(borderLayout2);

    String str[]={"Hidrógeno (H2)", "Oxígeno (O2)", "Nitrógeno (N2)", "Helio (He)", "Neón (Ne)", "Argón (Ar)"};
    for(int i=0; i<str.length; i++){
          chGases.addItem(str[i]);
    }
    label1.setText("Gas");
    label2.setText("Temperatura (ºK)");
    tTemperatura.setColumns(5);
    tTemperatura.setText("500");
    ValidaDouble valDouble=new ValidaDouble();
    tTemperatura.addFocusListener(valDouble);

    btnGrafica.setFont(new Font("Dialog", 1, 12));
    btnGrafica.setLabel("Gráfica");
        btnGrafica.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(ActionEvent e) {
                btnGrafica_actionPerformed(e);
            }
        });
    btnBorrar.setLabel("Borrar");
        btnBorrar.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(ActionEvent e) {
                btnBorrar_actionPerformed(e);
            }
        });

    this.add(panel1, BorderLayout.SOUTH);
    this.add(canvas, BorderLayout.CENTER);
    panel1.add(panel2, BorderLayout.WEST);
    panel2.add(label1, null);
    panel2.add(chGases, null);
    panel1.add(panel3, BorderLayout.CENTER);
    panel3.add(label2, null);
    panel3.add(tTemperatura, null);
    panel1.add(panel4, BorderLayout.EAST);
    panel4.add(btnGrafica, null);
    panel4.add(btnBorrar, null);
  }

  void btnGrafica_actionPerformed(ActionEvent e) {
     double temperatura=Double.valueOf(tTemperatura.getText()).doubleValue();
     int indice=chGases.getSelectedIndex();
     canvas.setNuevo(temperatura, indice);
  }

  void btnBorrar_actionPerformed(ActionEvent e) {
    canvas.repaint();
  }
}

class ValidaDouble extends FocusAdapter{
     public void focusLost(FocusEvent ev){
          TextField tEntrada=(TextField)(ev.getSource());
          try{
               Double.valueOf(tEntrada.getText()).doubleValue();
          }catch(NumberFormatException e){
               tEntrada.requestFocus();
               tEntrada.selectAll();
          }
     }
}