質問編集履歴
1
アドバイスに基づく修正ソース
test
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File without changes
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test
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@@ -177,3 +177,167 @@
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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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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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Circle.java::
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import java.awt.Color;
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import java.awt.Graphics;
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public class Circle
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{
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private int x;
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private int y;
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private int radius;
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public Circle(int x, int y, int radius)
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{
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this.x = x;
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this.y = y;
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this.radius = radius;
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}
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public void draw(Graphics g)
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{
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g.setColor(Color.red);
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g.drawOval(x - radius / 2, y - radius / 2, radius, radius);
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}
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}
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Sample4.java::
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import java.awt.BorderLayout;
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import java.awt.Graphics;
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import java.awt.event.MouseAdapter;
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import java.awt.event.MouseEvent;
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import java.util.ArrayList;
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import java.util.Iterator;
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import javax.swing.JFrame;
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import javax.swing.JPanel;
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public class Sample4 extends JFrame
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{
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private SamplePanel sp;
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public static void main(String[] args)
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{
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Sample4 sm = new Sample4();
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sm.setVisible(true);
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}
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public Sample4()
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{
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super("円を描画");
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setDefaultCloseOperation(EXIT_ON_CLOSE);
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setSize(500, 500);
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sp = new SamplePanel();
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add(sp, BorderLayout.CENTER);
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}
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public class SamplePanel extends JPanel
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{
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private int radius = 0;
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private ArrayList<Circle> circlelist = new ArrayList<Circle>();
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public SamplePanel()
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{
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addMouseListener(new SampleMouseListener());
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}
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public void paint(Graphics g)
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{
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super.paint(g);;
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Iterator<Circle> it = circlelist.iterator();
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while(it.hasNext()) {
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Circle c = it.next();
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c.draw(g);
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}
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}
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public class SampleMouseListener extends MouseAdapter
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{
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public void mousePressed(MouseEvent e)
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{
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circlelist.add(new Circle(e.getX(), e.getY(), radius++));
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repaint();
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}
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}
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}
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}
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