CODEWITHSUNDEEP
javaswinguser-interfacetimer
ImGone98
ImGone98

Reputation: 195

Slowly painting a line

I want this to slowly create a line that paints from 10,0 to 10,600. The line won't even paint at all, the only reason why I think it isn't working is my format and placing of different components are a little off? Why?

public class Moving extends JPanel {
    int counter;
    Timer time;
    public void setUp() {
        ActionListener action = new ActionListener() {  
            public void actionPerformed(ActionEvent event){
                counter++;
                repaint();

            }
        };
        time = new Timer(100, action);
        time.start();
    }

    public void paintComponent(Graphics g) {
        super.paintComponent(g);
        g.setColor(Color.RED);
        g.drawRect(10, counter, 20, 20);
    } 


    public static void main(String[] args) {
        Moving game = new Moving();
                    JFrame frame = new JFrame("Frame"); 
        frame.setSize(320, 340);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setVisible(true);
                    frame.add(game);
        game.setUp();
    }
}

Upvotes: 0

Views: 285

Answers (1)

MadProgrammer
MadProgrammer

Reputation: 347204

You've not added Moving to the frame you create...

Updated

I've updated the code slightly to demonstrate the point, adding Moving to a frame. I've also included the Initial Thread requirements

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.Timer;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;

public class Moving extends JPanel {

    int counter;
    Timer time;

    public Moving() {
        ActionListener action = new ActionListener() {
            public void actionPerformed(ActionEvent event) {
                counter++;
                repaint();

            }
        };
        time = new Timer(100, action);
    }

    public void start() {
        time.start();
    }

    @Override
    public void paintComponent(Graphics g) {
        super.paintComponent(g);
        g.setColor(Color.RED);
        g.drawRect(10, counter, 20, 20);
    }

    @Override
    public Dimension getPreferredSize() {
        return new Dimension(400, 400);
    }

    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
                }

                Moving moving = new Moving();
                JFrame frame = new JFrame("Testing");
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.setLayout(new BorderLayout());
                frame.add(moving);
                frame.pack();
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
                moving.start();
            }
        });
    }
}

Upvotes: 3

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