Re: Need help just inserting an image in a JPanel

<mcanncb@auburn.edu> wrote:


package graphingcalculator;

public class GraphingCalculator {

  public static void main(String[] args) {
    MainFrame frame = new MainFrame();
  }
}

package graphingcalculator;

import java.awt.BorderLayout;
import java.awt.Color;

import javax.swing.BoxLayout;
import javax.swing.JFrame;
import javax.swing.JScrollPane;

public class MainFrame extends JFrame {
  public MainFrame() {
    setTitle("Graphing Calculator");
    setSize(640,480);
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    setLayout(new BorderLayout());

    CalculatePanel calculate = new CalculatePanel();
    PlotPanel plot = new PlotPanel();
    plot.setBackground(Color.white);

    add(calculate,BorderLayout.NORTH);
    add(plot,BorderLayout.CENTER);
    setVisible(true);
  }
}

package graphingcalculator;

import java.awt.Graphics;
import java.awt.Graphics2D;

import javax.swing.JPanel;
import javax.swing.border.BevelBorder;

public class PlotPanel extends JPanel{

  public PlotPanel() {
    setBorder(new BevelBorder(BevelBorder.LOWERED));
  }

  public void paint(Graphics graphics) {
    super.paint(graphics);
    Graphics2D g = (Graphics2D)graphics;
    // TODO Draw image here.
    // See Andrews post.
  }
}

package graphingcalculator;

import java.awt.Color;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.text.DecimalFormat;

import javax.swing.JButton;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.border.BevelBorder;

    //Panel containing components
    public class CalculatePanel extends JPanel{
      //1) Declare components to be used
      private JLabel inputLabel, resultLabel;
      private JTextField xvar;
      private int x; private double ans;
      private JButton calcButton;
      //2) Sets up the GUI
       public CalculatePanel(){

      //2a) Create two labels
         inputLabel = new JLabel ("Enter posotive value of x:");
         resultLabel = new JLabel ("Value of expression");
      //2b) Create text field
         xvar = new JTextField (10);

      //2c) Add action listener to the text field
         xvar.addActionListener (new TextFieldListener());

      //2d) Add components to the panel
         add (inputLabel);
         add (xvar);
         add (resultLabel);
      //2e) set buttons and listeners
         calcButton = new JButton("Calculate Expression");
         calcButton.addActionListener(new CalcButtonListener());

         setPreferredSize (new Dimension(30, 45));
         setBorder(new BevelBorder(BevelBorder.LOWERED));
         setBackground (Color.green);

         add(calcButton);
      }

   //3) Create the action listener for the text field
       private class TextFieldListener implements ActionListener {
      //--------------------------------------------------------
      // Performs the conversion when the enter key is pressed in the text
field
      //--------------------------------------------------------
          public void actionPerformed (ActionEvent event){

            String text = xvar.getText();
            x = Integer.parseInt (text);
            double ans = Math.sqrt (Math.abs(3 * (Math.pow((x), 5))
             - (12 * (Math.pow((x), 4))) - (9 * (Math.pow((x), 2))) + (2
*x)));
            DecimalFormat df = new DecimalFormat ("0.###");
            String result = "Value of expression = " + df.format(ans);
            resultLabel.setText (result);

         }
      }
       private class CalcButtonListener implements ActionListener
      {
          public void actionPerformed (ActionEvent event)
         {
            String text = xvar.getText();
            x = Integer.parseInt (text);
            double ans = Math.sqrt (Math.abs(3 * (Math.pow((x), 5))
             - (12 * (Math.pow((x), 4))) - (9 * (Math.pow((x), 2))) +
(2 * x)));
            String result = "Value of expression = " + ans;
            DecimalFormat df = new DecimalFormat ("0.###");
            String result1 = "Value of expression = " + df.format(ans);
            resultLabel.setText (result1);
         }
      }
   }