JButton & JComboBox 1

[rbr19]

hi all,

i'm new to this forum & also to java programming. i have a problem i.e. i'm not sure how to get the jbutton to obtain the necessary texts displayed on the jcombobox & 'paint' them. the texts are supposed to be 'painted' vertically i.e. rotated anticlockwise 90 degrees.
basically, i have a few editable jcomboboxes & jbuttons. the jcomboboxes are used to contain a list of materials where the user would choose. when the user presses the 'plot' jbutton, it is supposed to get the text from the jcombobox & 'paint' it inside the rectangle (the rectangles shouldn't be there initially, it will be 'painted' simultaneously with the texts). this process will go on & on till the user ends the programme by pressing the end jbutton.
below is a shortened version of my code:


import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class Testing extends JFrame implements ActionListener
{

private String x[] ={ " ", "MaterialA", "MaterialB", "Material C"};
private String y[] = { " ", "+5", "+4", "+3", "+2", "+1", " 0", "-1", "-2", "-3", "-2", "-5" };



private JButton Back, Next , Plot, End;
private Container c;
private JPanel labelPanel, northPanel, southPanel;
private JComboBox designMaterialx, materialRatingy;


public Testing()
{
super( "Welcome" );
setSize( 800, 700 );

Container c = getContentPane();




northPanel = new JPanel();
northPanel.add(new Label( "Please choose accordingly:" ));
northPanel.setLayout (new FlowLayout(FlowLayout.CENTER, 20, 0));

designMaterialx = new JComboBox( x );
designMaterialx.setMaximumRowCount( 2 );
designMaterialx.setBorder(BorderFactory.createTitledBorder("Design Materials"));
northPanel.add( designMaterialx );
designMaterialx.setEditable(true);

materialRatingy = new JComboBox( y );
materialRatingy.setMaximumRowCount( 2 );
materialRatingy.setBorder(BorderFactory.createTitledBorder("Material Ratings"));
northPanel.add( materialRatingy );


c.add( northPanel, BorderLayout.NORTH );
setVisible( true );



southPanel = new JPanel();

Back = new JButton( "Back" );
Next = new JButton( "Next" );
Plot = new JButton( "Plot" );
End = new JButton( "End" );

southPanel.add( Back );
southPanel.add( Next );
southPanel.add( Plot );
southPanel.add( End );

c.add( southPanel, BorderLayout.SOUTH );
setVisible( true );

Back.addActionListener(this);
Next.addActionListener(this);
Plot.addActionListener(this);
End.addActionListener(this);


}



public void paint( Graphics g )
{
super.paint( g );


g.setColor(Color.black);
g.drawRect(120, 120, 20, 200);
g.drawString ("Material", 30, 220);
g.drawString ("Ratings", 30, 240);
g.drawString ("+5", 102, 130);
g.drawString ("0", 107, 220);
g.drawString ("-5", 102, 315);


g.setColor(Color.red);
g.drawRect(120, 321, 20, 200);
g.drawString ("Design", 30, 410);
g.drawString ("Materials", 30, 430);

}


public static void main( String args[] )
{
Testing app = new Testing();
app.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );

}

public void actionPerformed(ActionEvent e)
{

if(e.getSource()==Back)
{

System.out.println("Back");
}

else if(e.getSource()==Plot)

{
System.out.println("Plot");
}

else if(e.getSource()==Next)
{

System.out.println("Next");
}

else if(e.getSource()==End)
{

System.exit(0);
}
}

}


any advice, feedback, tips or codes similar with what i intend to do is very much appreciated.

thanks in advance.

 

[prosper]

//CenterCanvas should be a square so that rotating 90 degree will be a square too.
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.JInternalFrame;
import java.awt.geom.AffineTransform;
import java.awt.Graphics2D;
import java.awt.geom.*;
import javax.swing.DesktopManager;
class WholeFrame extends JFrame implements ActionListener
      {
private String  x[] ={ " ", "MaterialA", "MaterialB",  "Material C"};
private String  y[] = { "                       ", "+5", "+4", "+3", "+2", "+1", " 0", "-1", "-2", "-3", "-2", "-5" };
private JPanel labelPanel, northPanel, southPanel;
private JComboBox designMaterialx, materialRatingy;  
    private JButton Back, Next , Plot, End;

       JPanel topPanel, leftPanel, bottomPanel;
       CenterCanvas cc;
       LeftCanvas lc;
       public WholeFrame() 
              {
               super("WholeFrame");
               getContentPane().setLayout(null);
               topPanel = new JPanel();
               topPanel.setBackground(Color.blue);
               topPanel.setBounds(0,0,800,100);
               getContentPane().add(topPanel);

               lc = new LeftCanvas();
               lc.setBounds(0,100,150,700);
               getContentPane().add(lc);

               cc = new CenterCanvas();
               cc.setBounds(150,100,500,500);
               getContentPane().add(cc);
               cc.setBackground(Color.red);

               bottomPanel = new JPanel();
               bottomPanel.setBounds(150,600,650,100);
               getContentPane().add(bottomPanel);
               bottomPanel.setBackground(Color.green);
               Back = new JButton("Back");
               Plot = new JButton("Plot");
               Back.addActionListener(this);
               Plot.addActionListener(this);
               bottomPanel.setLayout(new GridLayout(1,3));
               bottomPanel.add(Back);
               bottomPanel.add(Plot);

      Container c = getContentPane(); 
      topPanel.setLayout(new GridLayout(1,3));
      topPanel.add(new Label( "Please choose accordingly:" ));

designMaterialx = new JComboBox( x );
designMaterialx.setMaximumRowCount( 2 );
designMaterialx.setBorder(BorderFactory.createTitledBorder("Design Materials"));
topPanel.add( designMaterialx );
designMaterialx.setEditable(true);
               }

   public void actionPerformed(ActionEvent e)
   {
       
       if(e.getSource()==Back)
       {
           
           System.out.println("Back");
       }
       
       else if(e.getSource()==Plot)
 
       {
           System.out.println("Plot");
           cc.changeMessage( designMaterialx.getSelectedItem().toString() );
       }
       
       else if(e.getSource()==Next)
       {
       
           System.out.println("Next");
       }
       
       else if(e.getSource()==End)
       {
       
           System.exit(0);
       }
   }

       public static void main(String args[])
              {
              WholeFrame wholeFrameObj = new WholeFrame();              
              wholeFrameObj.setSize(800,700);
              wholeFrameObj.setVisible(true);
              wholeFrameObj.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
              }
      }

class CenterCanvas extends Canvas
      {
       String messageToChange = "zzzzzz";
       boolean timeToChange = false;
       public void changeMessage(String temp)
              {
               messageToChange = temp;
               timeToChange = true;
               repaint();
              }
       public void paint(Graphics g)
              {
    Graphics2D g2 = (Graphics2D)g;
    //Update transform to provide rotation and display, 
    // the transform values.    
    System.out.println("Add Rotate Transform");
    //11.25 degrees about center
    g2.rotate(Math.PI/2.0,250.0,250.0);

g.setColor(Color.black);
g.drawRect(120, 120, 20, 200);
g.drawString ("Material", 30, 220);
g.drawString ("Ratings", 30, 240);
g.drawString ("+5", 102, 130);
g.drawString ("0", 107, 220);
g.drawString ("-5", 102, 315);

        
g.setColor(Color.black);
g.drawRect(120, 321, 20, 200);
g.drawString ("Design", 30, 410);
if (!timeToChange)
   g.drawString ("Materials", 30, 430);
else
    {
    g.drawString (messageToChange, 30, 430);
    timeToChange = false;
    }
              }

      
      }
class LeftCanvas extends Canvas
      {
       public void paint(Graphics g)
              {
g.setColor(Color.black);
g.drawRect(120, 120-100, 20, 200);
g.drawString ("Material", 30, 220);
g.drawString ("Ratings", 30, 240);
g.drawString ("+5", 102, 130-100);
g.drawString ("0", 107, 220-100);
g.drawString ("-5", 102, 315-100);

        
g.setColor(Color.red);
g.drawRect(120, 321-100, 20, 200);
g.drawString ("Design", 30, 410-100);
g.drawString ("Materials", 30, 430-100);
              }
      }

 

[rbr19]

hi prosper,

thanks for replying. i really appreciate it. i've read your code & also ran it a few times to figure out what you have added & modified to my code. i've learned something new from it but the addition of the CenterCanvas is not what i planned to do actually.

the value selected in the design materials jcombo box is the one that is supposed to be rotated (90 degrees anti-clockwise) & painted in the g.drawRect(120, 321-100, 20, 200) rectangles upon the clicking of the plot jbutton. this rectangle & the new value of the jcombo box will keep 'adding up' i.e. new values & rectangles will be added next to the existing ones as long as the plot button is clicked. i assume i have to 'play around' with the coordinates to get the rectangles & those values painted again & again. the g.drawString ("Material", 30, 220);
g.drawString ("Ratings", 30, 240); g.drawString ("Design", 30, 410); g.drawString ("Materials", 30, 430); should only be painted once i.e. when the plot jbutton is initially pressed. subsequent pressing of the plot jbutton should not paint those strings anymore.


i hope you or anyone in this forum could tell or advise me on how to do that. any kind of help is appreciated.

thanks in advance.