Hello,
I need to re size the square whenever I move the slider; how can I accomplish that? Your time and effort are appreciated.

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

public class SquareSliderTest{
    public static void main(String[] args){
        EventQueue.invokeLater(new Runnable(){
            public void run(){
                SliderFrame frame = new SliderFrame();
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.setVisible(true);
            }
        });
    }
}

class SliderFrame extends JFrame
{
    public SliderFrame()
    {
        setTitle("Square Slider");
        setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);
        SquareComponent component = new SquareComponent();
        add(component);
       
        sliderPanel = new JPanel();
        sliderPanel.setLayout(new FlowLayout(FlowLayout.LEFT));
       
        listener = new ChangeListener()
           {
              public void stateChanged(ChangeEvent event)
                {
                   // update text field when the slider value changes
                   JSlider source = (JSlider) event.getSource();
                   textField.setText("" + source.getValue());
                   
                }
          };    
        // add the snap to tick slider  
        JSlider slider = new JSlider();
        slider = new JSlider();
        slider.setPaintTicks(true);
        slider.setSnapToTicks(true);
        slider.setMajorTickSpacing(20);
        slider.setMinorTickSpacing(2);
        addSlider(slider, "Slide to size the square");
       
        //Set the location of the slider
        add(sliderPanel, BorderLayout.SOUTH);
       
        //display the slider on top
        textField = new JTextField();
        add(textField, BorderLayout.NORTH);
    }
    private void addSlider(JSlider s, String description)
    {
           s.addChangeListener(listener);
           JPanel panel = new JPanel();
           panel.add(s);
           panel.add(new JLabel(description));
           sliderPanel.add(panel);
       
    }
    private JTextField textField;
    private JPanel sliderPanel;
    private ChangeListener listener;
    public static final int DEFAULT_WIDTH = 350;
    public static final int DEFAULT_HEIGHT = 400;

}

class SquareComponent extends JComponent
{
    public void paintComponent(Graphics g)
    {
            Graphics2D g2 = (Graphics2D) g;
            double leftX = 125;
            double topY = 125;
            double width = 10;
            double height = 10;

      Rectangle2D rect = new Rectangle2D.Double(leftX, topY, width, height);
      g2.draw(rect);

    }
}

Try this code

import java.awt.*;
import java.awt.geom.*;
import javax.swing.*;
import javax.swing.event.*;
 
public class SquareSliderTest{
    public static void main(String[] args){
        EventQueue.invokeLater(new Runnable(){
            public void run(){
                SliderFrame frame = new SliderFrame();
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.setVisible(true);
            }
        });
    }
}
 
class SliderFrame extends JFrame
{
    public SliderFrame()
    {
        setTitle("Square Slider");
        setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);
        component = new SquareComponent();
        add(component);
 
        sliderPanel = new JPanel();
        sliderPanel.setLayout(new FlowLayout(FlowLayout.LEFT));
 
        listener = new ChangeListener()
           {
              public void stateChanged(ChangeEvent event)
                {
                   // update text field when the slider value changes
                   JSlider source = (JSlider) event.getSource();
                   textField.setText("" + source.getValue());
				   component.redrawComponent(DEFAULT_WIDTH, DEFAULT_HEIGHT, source.getValue());
                }
          };    
        // add the snap to tick slider  
        JSlider slider = new JSlider();
        slider = new JSlider();
        slider.setPaintTicks(true);
        slider.setSnapToTicks(true);
        slider.setMajorTickSpacing(20);
        slider.setMinorTickSpacing(2);
        addSlider(slider, "Slide to size the square");
 
        //Set the location of the slider
        add(sliderPanel, BorderLayout.SOUTH);
 
        //display the slider on top
        textField = new JTextField();
        add(textField, BorderLayout.NORTH);


		textField.setText(""+slider.getValue());
		component.redrawComponent(DEFAULT_WIDTH, DEFAULT_HEIGHT, slider.getValue());
    }
    private void addSlider(JSlider s, String description)
    {
           s.addChangeListener(listener);
           JPanel panel = new JPanel();
           panel.add(s);
           panel.add(new JLabel(description));
           sliderPanel.add(panel);
 
    }
    private JTextField textField;
    private JPanel sliderPanel;
    private ChangeListener listener;
	SquareComponent component;
    public static final int DEFAULT_WIDTH = 350;
    public static final int DEFAULT_HEIGHT = 400;
 
}
 
class SquareComponent extends JComponent
{
	double leftX;
    double topY;
    double width;
    double height;

    public void paintComponent(Graphics g)
    {
            Graphics2D g2 = (Graphics2D) g;
            
		    Rectangle2D rect = new Rectangle2D.Double(leftX, topY, width, height);
			g2.draw(rect);
 
    }

	public void redrawComponent(int frameWidth, int frameHeight, int sliderValue){
		leftX = (frameWidth/2 - sliderValue/2) - 50;
		topY = (frameHeight/2 - sliderValue/2) - 50;
		width = sliderValue;
		height = sliderValue;

		repaint();
	}
}
This question has already been answered. Start a new discussion instead.