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Thread: Trouble with repainting a traffic light using radio buttons: Any Suggestions?

  1. #1
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    Default Trouble with repainting a traffic light using radio buttons: Any Suggestions?

    import javax.swing.*;
    import java.awt.*;
    import java.awt.Graphics;
    import java.awt.event.*;
     
    public class TrafficLight extends JFrame {
     
      private NewLabel lights = new NewLabel();
     
      private JRadioButton red, yellow, green;
     
      public TrafficLight() {
     
        JPanel p1 = new JPanel();
     
        p1.setLayout(new GridLayout(1,3));
     
        add(lights, BorderLayout.CENTER);
        add(p1, BorderLayout.SOUTH);
     
      	p1.add(red = new JRadioButton("Red"));
    	p1.add(yellow = new JRadioButton("Yellow"));
    	p1.add(green = new JRadioButton("Green"));
     
    	//Button Group
    	ButtonGroup group = new ButtonGroup();
    	group.add(red);
    	group.add(yellow);
    	group.add(green);
     
      }
     
      class LightListener implements ActionListener {
      	public void actionPerformed (ActionEvent e) {
     
      	red.addActionListener(new LightListener());
    	green.addActionListener(new LightListener());
    	yellow.addActionListener(new LightListener());
     
    	if (e.getSource() == red)
    		System.out.println("red");
     
    	else if (e.getSource() == yellow)
    		System.out.println("yellow");
     
    	else if (e.getSource() == green)
    		System.out.println("green");
     
      	}
      }
     
     
      public static void main(String[] args) {
        TrafficLight frame = new TrafficLight();
        frame.setTitle("TrafficLight");
        frame.setLocationRelativeTo(null); // Center the frame
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(200, 250);
        frame.setVisible(true);
      }
     
    class NewLabel extends JPanel {
     
     
      protected void paintComponent(Graphics g) {
        super.paintComponent(g);
     
     
        g.drawRect(10,10,50,150);
        g.drawOval(10,10,50,50);
        g.drawOval(10,60,50,50);
        g.drawOval(10,110,50,50);
     
     
      }
    }
    }


    I can't make it so that when you click the radio button it repaints the circle the appropriate color. In this case, the colors of a traffic light.

    If the source is red: It needs to paint the top circle red

    If the source is yellow: It needs to paint the center circle yellow

    If the source is red: It needs " " " red...

    I'm having trouble repainting it after the radio buttons are selected. I also don't even know if the radio buttons are doing anything... help is appreciated.

    -Nate
    Last edited by Ha1luciNate; October 10th, 2011 at 01:52 PM.


  2. #2
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    Default Re: Trouble with repainting a traffic light using radio buttons: Any Suggestions?

    I don't see any code that changes any color.

    I don't see when you add a LightListener to anything, except in the LightListener itself, which doesn't make sense.
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  3. #3
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    Default Re: Trouble with repainting a traffic light using radio buttons: Any Suggestions?

    No kidding, that's why I'm asking. How do I make it so that when I click the button it changes the color. I have all the listeners setup and it draws the lights. Now I just need it to change the colors.

    Thank you for re-stating my question

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    Default Re: Trouble with repainting a traffic light using radio buttons: Any Suggestions?

    import javax.swing.*;
    import java.awt.*;
    import java.awt.event.*;
     
    //Credit to Dr.Roberson for ControlCircle2 which was used as the basis for this program.
    //Nate Heels:
     
    public class TrafficLight extends JFrame {
      Color x = Color.white;
      Color y = Color.white;
      Color z = Color.white;
     
      private JRadioButton jbtRed = new JRadioButton("red");
      private JRadioButton jbtYellow = new JRadioButton("yellow");
      private JRadioButton jbtGreen = new JRadioButton("green");
     
      private CirclePanel canvas = new CirclePanel();
     
      public TrafficLight() {
        JPanel panel = new JPanel();
        panel.add(jbtRed);
        panel.add(jbtYellow);
        panel.add(jbtGreen);
     
        panel.setBackground(Color.white);
        canvas.setBackground(Color.white);
     
        ButtonGroup group = new ButtonGroup();
    	group.add(jbtRed);
    	group.add(jbtYellow);
    	group.add(jbtGreen);
     
        this.add(canvas, BorderLayout.CENTER);
        this.add(panel, BorderLayout.SOUTH);
     
        jbtRed.addActionListener(new Listener());
        jbtYellow.addActionListener(new Listener());
        jbtGreen.addActionListener(new Listener());
     
      }
     
     
      public static void main(String[] args) {
        JFrame frame = new TrafficLight();
        frame.setTitle("TrafficLight");
        frame.setLocationRelativeTo(null);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(200, 250);
        frame.setVisible(true);
      }
     
      class Listener implements ActionListener {
        public void actionPerformed(ActionEvent e) {
          System.out.println(new java.util.Date(e.getWhen()));
          if (e.getSource() == jbtRed)
            canvas.paintred();
          else if (e.getSource() == jbtYellow)
        	canvas.paintyellow();
          else if (e.getSource() == jbtGreen)
          	canvas.paintgreen();
        }
      }
     
      class CirclePanel extends JPanel {
     
        public void paintred() {
          x = Color.red;
          y = Color.white;
          z = Color.white;
          repaint();
        }
     
        public void paintyellow() {
          x = Color.white;
          y = Color.yellow;
          z = Color.white;
          repaint();
        }
     
        public void paintgreen() {
          x = Color.white;
          y = Color.white;
          z = Color.green;
          repaint();
        }
     
        protected void paintComponent(Graphics g) {
          super.paintComponent(g);
     
    	g.setColor(x);
    	g.fillOval(10,10,50,50);
     
    	g.setColor(y);
    	g.fillOval(10,60,50,50);
     
    	g.setColor(z);
    	g.fillOval(10,110,50,50);
     
    	g.setColor(Color.black);
        g.drawRect(10,10,50,150);
        }
      }
    }

    I figured it out by taking a completely different approach.

  5. #5
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    Default Re: Trouble with repainting a traffic light using radio buttons: Any Suggestions?

    Quote Originally Posted by Ha1luciNate View Post
    Thank you for re-stating my question
    No problem, especially considering that your original post does not include an actual question (usually they end in question marks). You were obviously not far from a solution, but you didn't say what confused you or what you were expecting to happen. You simply posted an incomplete solution without an actual question. What kind of a response were you expecting?

    Anyway, I did my best to point out the things you were missing in the hopes that you would attempt them and come back if you got stuck, maybe with a more specific question. The attitude is unnecessary, and it's only going to decrease your chances of getting help in the future.

    Glad you got it figured out though.
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    Default Re: Trouble with repainting a traffic light using radio buttons: Any Suggestions?

    Wait, what part of this code adds the button group to the panel? I'm missing something obvious... (new to programming, sorry)

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