回答編集履歴
2
コードのゴミを削除
test
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@@ -190,7 +190,7 @@
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private JLabel messageLabel = new JLabel("数値を入力してください");
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private JLabel messageLabel = new JLabel("数値を入力してください");
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private ChangeListener listener;
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1
コード追加
test
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@@ -11,3 +11,349 @@
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java でウインドウを使ってどうこうするモノを作ることは、 System.out.println や Scanner を使ったコマンド型のプログラムよりも難易度が格段に違います。
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大変失礼ですが、このエラーで戸惑われているようでは『まだ早いのでは』と思わざるを得ません。
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----
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GUI で完結するように作ってみました。
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LineGraph.java
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```java
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package teratail_java.q360628;
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import java.awt.*;
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import java.awt.event.*;
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import javax.swing.*;
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import javax.swing.event.DocumentEvent;
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import javax.swing.event.DocumentListener;
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public class LineGraph extends JFrame {
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public static void main(String args[]) {
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new LineGraph().setVisible(true);
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}
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private static final int DATASIZE = 6;
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LineGraph() {
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super("LineGraph");
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setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
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LineGraphPanel graphPanel = new LineGraphPanel(DATASIZE);
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DataPanel dataPanel = new DataPanel(DATASIZE, new DataPanel.ChangeListener() {
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@Override
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public void changed(int index, int value) {
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graphPanel.setData(index, value);
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}
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});
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add(graphPanel, BorderLayout.CENTER);
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add(dataPanel, BorderLayout.NORTH);
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pack();
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}
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private static class LineGraphPanel extends JPanel {
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private int data[];
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LineGraphPanel(int datasize) {
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setPreferredSize(new Dimension(300, 300));
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setMinimumSize(getPreferredSize());
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data = new int[datasize];
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}
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void setData(int index, int value) {
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data[index] = value;
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repaint();
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}
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public void paint(Graphics g) {
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super.paint(g);
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//Xスケール
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g.drawLine( 50, 250, 250, 250);
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for (int i=0; i<data.length; i++) {
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String s = String.format("%3d", i);
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g.drawString(s, i * 20 + 40, 270);
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}
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//Yスケール
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g.drawLine( 50, 40, 50, 250);
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for (int i=0; i<=10; i++) {
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String s = String.format("%3d", i * 10);
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g.drawString(s, 28, 250 - i * 20);
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}
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//グラフ
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for (int i=0; i<data.length-1; i++) {
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int x1 = i * 20 + 50;
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int x2 = (i + 1) * 20 + 50;
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int y1 = 250 - data[i] * 2;
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int y2 = 250 - data[i+1] * 2;
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g.drawLine( x1, y1, x2, y2);
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}
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}
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}
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private static class DataPanel extends JPanel {
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interface ChangeListener {
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void changed(int index, int value);
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}
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private JLabel messageLabel = new JLabel("数値を入力してください");;
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private ChangeListener listener;
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DataPanel(int size, ChangeListener listener) {
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super(new BorderLayout());
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this.listener = listener;
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add(messageLabel, BorderLayout.NORTH);
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JPanel inputPanel = new JPanel(new FlowLayout());
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for(int i=0; i<size; i++) {
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inputPanel.add(new LabelAndInputField(i, 0));
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}
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add(inputPanel, BorderLayout.CENTER);
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setNormalState();
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}
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private void setNormalState() {
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messageLabel.setForeground(Color.BLACK);
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}
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private void setErrorState() {
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messageLabel.setForeground(Color.RED);
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}
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private class LabelAndInputField extends JPanel implements ActionListener, DocumentListener, FocusListener {
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private int number;
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private JLabel label;
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private JTextField field;
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LabelAndInputField(int number, int initialValue) {
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super(new BorderLayout());
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this.number = number;
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field = new JTextField(""+initialValue, 3);
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field.addActionListener(this);
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field.getDocument().addDocumentListener(this);
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field.addFocusListener(this);
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label = new JLabel(number+":");
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add(label, BorderLayout.WEST);
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add(field, BorderLayout.CENTER);
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setNormalState();
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}
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private void setNormalState() {
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label.setForeground(Color.BLACK);
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DataPanel.this.setNormalState();
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}
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private void setErrorState() {
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label.setForeground(Color.RED);
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DataPanel.this.setErrorState();
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}
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@Override
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public void actionPerformed(ActionEvent ae) {
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try {
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int data = Integer.parseInt(field.getText());
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listener.changed(number, data);
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} catch(NumberFormatException e) {
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setErrorState();
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field.requestFocus();
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}
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}
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@Override
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public void removeUpdate(DocumentEvent e) { setNormalState(); }
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@Override
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public void insertUpdate(DocumentEvent e) { setNormalState(); }
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@Override
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public void changedUpdate(DocumentEvent e) { setNormalState(); }
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@Override
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public void focusLost(FocusEvent e) { actionPerformed(null); }
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@Override
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public void focusGained(FocusEvent e) {} //ignore
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}
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}
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}
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```
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