質問編集履歴
1
アドバイスに基づく修正ソース
title
CHANGED
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File without changes
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body
CHANGED
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@@ -87,4 +87,86 @@
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87
87
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}
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88
88
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89
89
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90
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-
###補足情報(言語/FW/ツール等のバージョンなど)
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90
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###補足情報(言語/FW/ツール等のバージョンなど)
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91
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+
ご回答ありがとうございます。うまくいきました。
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92
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Circle.java::
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93
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import java.awt.Color;
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94
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+
import java.awt.Graphics;
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95
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+
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96
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public class Circle
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97
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{
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98
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private int x;
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99
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private int y;
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100
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private int radius;
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101
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102
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public Circle(int x, int y, int radius)
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103
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{
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104
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this.x = x;
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105
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this.y = y;
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106
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this.radius = radius;
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107
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}
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108
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public void draw(Graphics g)
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109
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{
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110
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g.setColor(Color.red);
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111
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g.drawOval(x - radius / 2, y - radius / 2, radius, radius);
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112
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}
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113
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}
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114
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115
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Sample4.java::
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116
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import java.awt.BorderLayout;
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117
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import java.awt.Graphics;
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118
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import java.awt.event.MouseAdapter;
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119
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import java.awt.event.MouseEvent;
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120
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import java.util.ArrayList;
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121
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import java.util.Iterator;
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122
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123
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import javax.swing.JFrame;
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124
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import javax.swing.JPanel;
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125
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126
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public class Sample4 extends JFrame
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127
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{
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128
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private SamplePanel sp;
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129
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130
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public static void main(String[] args)
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131
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{
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132
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Sample4 sm = new Sample4();
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133
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sm.setVisible(true);
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134
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}
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135
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public Sample4()
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136
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{
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137
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super("円を描画");
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138
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setDefaultCloseOperation(EXIT_ON_CLOSE);
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139
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setSize(500, 500);
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140
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sp = new SamplePanel();
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141
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add(sp, BorderLayout.CENTER);
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142
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}
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143
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public class SamplePanel extends JPanel
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144
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{
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145
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private int radius = 0;
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146
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147
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private ArrayList<Circle> circlelist = new ArrayList<Circle>();
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148
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149
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public SamplePanel()
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150
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{
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151
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addMouseListener(new SampleMouseListener());
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152
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}
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153
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public void paint(Graphics g)
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154
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{
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155
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super.paint(g);;
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156
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Iterator<Circle> it = circlelist.iterator();
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157
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while(it.hasNext()) {
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158
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Circle c = it.next();
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159
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c.draw(g);
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160
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}
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161
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}
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162
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public class SampleMouseListener extends MouseAdapter
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163
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{
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164
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165
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public void mousePressed(MouseEvent e)
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166
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{
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167
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circlelist.add(new Circle(e.getX(), e.getY(), radius++));
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168
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repaint();
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169
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}
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170
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}
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171
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}
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172
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}
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