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JLabels のリストをあたかも一連のライトであるかのように「ライトアップ」しようとしています。とにかく、私は JLabel の配列である JPanel を持つ単純な GUI を持っています。タイマーを使用して、背景色を黒から緑に変更して、「点灯」しているように見せています。それらを上向きに照らすコードを見つけましたが、下向きに戻るのは問題のようです。

これまでの作業コード:

    this.timer = new Timer(100, new ActionListener() {
        private int sequence = 0;

        public void actionPerformed(ActionEvent evt) {

            if (sequence % 2 == 0) {
                labels[1].setBackground(Color.black);
                labels[3].setBackground(Color.black);
                labels[5].setBackground(Color.black);
                labels[7].setBackground(Color.black);
                labels[sequence].setBackground(Color.green);
                sequence++;
            } else if (sequence % 2 != 0) {
                labels[0].setBackground(Color.black);
                labels[2].setBackground(Color.black);
                labels[4].setBackground(Color.black);
                labels[6].setBackground(Color.black);
                labels[sequence].setBackground(Color.green);
                sequence++;
            }

            if (sequence > 7) {
                sequence = 0;
            }


        }

    });
    this.timer.start();

}
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2 に答える 2

2

カウント変数を使用して配列またはコレクションを反復処理し、インデックス ラベルの右側のラベルを背景色に設定し、インデックス ラベルをアクティブな色に設定し、インデックスを進めます。例えば：

import java.awt.Color;
import java.awt.Dimension;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;    
import javax.swing.*;

@SuppressWarnings("serial")
public class LarsonScanner extends JPanel {
   private static final int PANEL_COUNT = 50;
   private static final int TIMER_DELAY = 30;
   private static final Color BACKGROUND = Color.BLACK;
   private static final Color ACTIVE_COLOR = Color.GREEN;
   private static final Color PARTIAL_COLOR = new Color(0, 90, 0);
   private static final Dimension RIGID_AREA = new Dimension(14, 1);

   private JPanel[] panels = new JPanel[PANEL_COUNT];

   public LarsonScanner() {
      setLayout(new GridLayout(1, 0));
      for (int i = 0; i < panels.length; i++) {
         panels[i] = new JPanel();
         panels[i].add(Box.createRigidArea(RIGID_AREA));
         panels[i].setBackground(BACKGROUND);
         add(panels[i]);
      }
      new Timer(TIMER_DELAY, new TimerListener()).start();
   }

   private class TimerListener implements ActionListener {
      private int count = 0;

      @Override
      public void actionPerformed(ActionEvent e) {
         int index = (count - 2 + panels.length) % panels.length;
         panels[index].setBackground(BACKGROUND);
         int prior = (count - 1 + panels.length) % panels.length;
         int next = (count + 1) % panels.length;
         panels[count].setBackground(ACTIVE_COLOR);
         panels[prior].setBackground(PARTIAL_COLOR);
         panels[next].setBackground(PARTIAL_COLOR);
         count++;
         count %= panels.length;
      }
   }

   private static void createAndShowGui() {
      LarsonScanner mainPanel = new LarsonScanner();

      JFrame frame = new JFrame("LarsonScanner");
      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      frame.getContentPane().add(mainPanel);
      frame.pack();
      frame.setLocationByPlatform(true);
      frame.setVisible(true);
   }

   public static void main(String[] args) {
      SwingUtilities.invokeLater(new Runnable() {
         public void run() {
            createAndShowGui();
         }
      });
   }
}

プログラムの編集 2
反復 2:

import java.awt.Color;
import java.awt.Dimension;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.*;

@SuppressWarnings("serial")
public class LarsonScanner extends JPanel {
   private static final int PANEL_COUNT = 40;
   private static final int TIMER_DELAY = 20;
   private static final Color BACKGROUND = Color.BLACK;
   private static final Color ACTIVE_COLOR = Color.GREEN;
   private static final Color PARTIAL_COLOR = new Color(0, 90, 0);
   private static final Dimension RIGID_AREA = new Dimension(14, 1);

   private JPanel[] panels = new JPanel[PANEL_COUNT];

   public LarsonScanner() {
      setLayout(new GridLayout(1, 0));
      for (int i = 0; i < panels.length; i++) {
         panels[i] = new JPanel();
         panels[i].add(Box.createRigidArea(RIGID_AREA));
         panels[i].setBackground(BACKGROUND);
         add(panels[i]);
      }
      new Timer(TIMER_DELAY, new TimerListener()).start();
   }

   private class TimerListener implements ActionListener {
      private int count = 0;
      private boolean goingRight = true;

      @Override
      public void actionPerformed(ActionEvent e) {
         if (goingRight) {
            int index = (count - 2 + panels.length) % panels.length;
            panels[index].setBackground(BACKGROUND);
            int prior = Math.max((count - 1) % panels.length, 0);
            int next = Math.min(count + 1, panels.length - 1);
            panels[prior].setBackground(PARTIAL_COLOR);
            panels[next].setBackground(PARTIAL_COLOR);
            panels[count].setBackground(ACTIVE_COLOR);
            count++;
            if (count == panels.length) {
               count--;
               goingRight = false;
            }
         } else {
            int index = (count + 2) % panels.length;
            panels[index].setBackground(BACKGROUND);
            int prior = Math.max((count - 1) % panels.length, 0);
            int next = Math.min(count + 1, panels.length - 1);
            panels[prior].setBackground(PARTIAL_COLOR);
            panels[next].setBackground(PARTIAL_COLOR);
            panels[count].setBackground(ACTIVE_COLOR);
            count--;
            if (count == -1) {
               count++;
               goingRight = true;
            }
         }
      }
   }

   private static void createAndShowGui() {
      LarsonScanner mainPanel = new LarsonScanner();

      JFrame frame = new JFrame("LarsonScanner");
      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      frame.getContentPane().add(mainPanel);
      frame.pack();
      frame.setLocationByPlatform(true);
      frame.setVisible(true);
   }

   public static void main(String[] args) {
      SwingUtilities.invokeLater(new Runnable() {
         public void run() {
            createAndShowGui();
         }
      });
   }
}
于 2013-11-03T22:02:43.890 に答える