回答編集履歴
2
コードのゴミを削除
answer
CHANGED
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@@ -94,7 +94,7 @@
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94
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void changed(int index, int value);
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95
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}
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96
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97
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-
private JLabel messageLabel = new JLabel("数値を入力してください");
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97
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+
private JLabel messageLabel = new JLabel("数値を入力してください");
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98
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private ChangeListener listener;
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99
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DataPanel(int size, ChangeListener listener) {
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1
コード追加
answer
CHANGED
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@@ -4,4 +4,177 @@
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4
4
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少なくとも Swing ではキー入力するために Scanner は使えません。
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5
5
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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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7
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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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7
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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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8
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+
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9
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+
----
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10
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11
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GUI で完結するように作ってみました。
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12
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+
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13
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+
LineGraph.java
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14
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```java
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15
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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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32
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LineGraph() {
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super("LineGraph");
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setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
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35
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+
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36
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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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40
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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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50
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private int data[];
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51
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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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58
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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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66
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67
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//Xスケール
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68
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g.drawLine( 50, 250, 250, 250);
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69
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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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73
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74
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//Yスケール
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75
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g.drawLine( 50, 40, 50, 250);
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76
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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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80
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81
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//グラフ
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82
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for (int i=0; i<data.length-1; i++) {
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83
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int x1 = i * 20 + 50;
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84
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int x2 = (i + 1) * 20 + 50;
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int y1 = 250 - data[i] * 2;
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86
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int y2 = 250 - data[i+1] * 2;
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87
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g.drawLine( x1, y1, x2, y2);
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88
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}
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89
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}
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90
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}
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91
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92
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private static class DataPanel extends JPanel {
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93
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interface ChangeListener {
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94
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void changed(int index, int value);
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95
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}
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96
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97
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private JLabel messageLabel = new JLabel("数値を入力してください");;
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98
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private ChangeListener listener;
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99
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100
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DataPanel(int size, ChangeListener listener) {
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101
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super(new BorderLayout());
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102
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this.listener = listener;
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103
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104
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add(messageLabel, BorderLayout.NORTH);
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105
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106
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JPanel inputPanel = new JPanel(new FlowLayout());
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107
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for(int i=0; i<size; i++) {
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108
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inputPanel.add(new LabelAndInputField(i, 0));
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109
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}
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110
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add(inputPanel, BorderLayout.CENTER);
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111
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+
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112
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setNormalState();
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113
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}
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114
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115
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private void setNormalState() {
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116
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messageLabel.setForeground(Color.BLACK);
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117
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}
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118
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119
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private void setErrorState() {
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120
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messageLabel.setForeground(Color.RED);
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121
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}
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122
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123
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private class LabelAndInputField extends JPanel implements ActionListener, DocumentListener, FocusListener {
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124
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private int number;
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125
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private JLabel label;
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126
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private JTextField field;
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127
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+
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128
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LabelAndInputField(int number, int initialValue) {
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129
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super(new BorderLayout());
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130
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this.number = number;
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131
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132
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field = new JTextField(""+initialValue, 3);
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133
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field.addActionListener(this);
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field.getDocument().addDocumentListener(this);
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135
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field.addFocusListener(this);
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136
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label = new JLabel(number+":");
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138
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139
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add(label, BorderLayout.WEST);
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140
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add(field, BorderLayout.CENTER);
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141
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142
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setNormalState();
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143
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}
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144
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+
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145
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private void setNormalState() {
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146
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label.setForeground(Color.BLACK);
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147
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DataPanel.this.setNormalState();
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148
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}
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149
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+
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150
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private void setErrorState() {
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151
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label.setForeground(Color.RED);
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152
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DataPanel.this.setErrorState();
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153
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}
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154
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155
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@Override
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156
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public void actionPerformed(ActionEvent ae) {
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157
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try {
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158
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int data = Integer.parseInt(field.getText());
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159
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listener.changed(number, data);
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160
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} catch(NumberFormatException e) {
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161
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setErrorState();
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162
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field.requestFocus();
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163
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}
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164
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}
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165
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+
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166
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@Override
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167
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public void removeUpdate(DocumentEvent e) { setNormalState(); }
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168
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+
@Override
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169
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+
public void insertUpdate(DocumentEvent e) { setNormalState(); }
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170
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+
@Override
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171
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public void changedUpdate(DocumentEvent e) { setNormalState(); }
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172
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+
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173
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+
@Override
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174
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+
public void focusLost(FocusEvent e) { actionPerformed(null); }
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175
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+
@Override
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176
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+
public void focusGained(FocusEvent e) {} //ignore
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177
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+
}
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178
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+
}
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179
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+
}
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180
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+
```
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