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尝试编写某种 Gui 并且需要绘制嵌套的 4096 个椭圆并想枚举它们（从 1 到 4096）。但是，无法弄清楚 drawOval 方法是如何工作的（更具体地说，找到数学公式并在方法中使用坐标参数几乎没有问题）

这是我到目前为止所做的：此代码绘制了 1 个圆圈并尝试减少参数但没有成功。您能解释一下如何正确使用draw方法的参数以及如何为此制定公式吗？

其次，我想给每个椭圆一个数字，怎么做？

    protected void paintComponent(Graphics g) {
        super.paintComponent(g);
        Graphics2D obj = (Graphics2D)g;
        obj.setRenderingHint(
                RenderingHints.KEY_ANTIALIASING,
                RenderingHints.VALUE_ANTIALIAS_ON);
        obj.setColor(Color.black);
        obj.drawOval(0,0, getWidth()+1, getHeight()+1);

    }

    private static void make() {
        JFrame frame = new JFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.add(new deneme2());
        frame.pack();
        frame.setVisible(true);
    }

public static void main(String[] args) {
    SwingUtilities.invokeLater(new Runnable() {
        public void run() {
            make();
        }
    });
}
}
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1 回答 1

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这是对此处提供的示例的补充，该示例展示了如何绘制多个连续的圆圈并演示了如何将文本呈现给它们......

在此处输入图像描述 

import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.FontMetrics;
import java.awt.Graphics;
import java.awt.Graphics2D;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;

public class Circles {

    public static void main(String[] args) {
        new Circles();
    }

    public Circles() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
                }

                JFrame frame = new JFrame("Testing");
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.setLayout(new BorderLayout());
                frame.add(new TestPane());
                frame.pack();
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
            }
        });
    }

    public class TestPane extends JPanel {

        public TestPane() {
        }

        @Override
        public Dimension getPreferredSize() {
            return new Dimension(200, 200);
        }

        @Override
        protected void paintComponent(Graphics g) {
            super.paintComponent(g);
            Graphics2D g2d = (Graphics2D) g.create();
            FontMetrics fm = g2d.getFontMetrics();
            int padding = fm.getHeight() + 4;
            int width = getWidth() - 1 - padding;
            int height = getHeight() - 1 - padding;

            int radius = Math.min(width, height);
            int x = (padding + (width - radius)) / 2;
            int y = (padding + (height - radius)) / 2;
            g2d.drawOval(x, y, radius, radius);

            String text = "This is a test";

            int centerX = (padding + radius) / 2;
            int centerY = (padding + radius) / 2;

            x = (centerX - (fm.stringWidth(text)) / 2);
            y = centerY - (radius / 2);
            g2d.drawString(text, x, y);

            x = centerX - (radius / 2);
            g2d.drawString(text, x, centerY);

            x = (centerX - (fm.stringWidth(text)) / 2);
            y = centerY + (radius / 2);
            g2d.drawString(text, x, y);

            x = (centerX - (fm.stringWidth(text)) / 2);
            y = centerY - (radius / 2);
            g2d.rotate(Math.toRadians(90), getWidth() / 2, getHeight() / 2);
            g2d.drawString(text, x, y);

            g2d.dispose();
        }
    }       
}

我还建议您使用2D Graphics进行农场化

于 2013-06-07T00:57:50.343 回答