在Java中绘制一个漂亮的圆圈

我正在使用 Java Graphics而且我一直在变得“丑陋”.

这是我的Java程序所做的

这是在Matlab中做的同样的事情

我认为Java显然不像Matlab那样“好看”,特别是在圆的边缘.请注意,这与分辨率无关……这些图像的大小几乎相同.另请注意,我已经设置了渲染提示.

这是一个独立的主要功能,你可以运行来测试这个.

package test;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.Shape;
import java.awt.geom.AffineTransform;
import java.awt.geom.Ellipse2D;
import java.awt.image.BufferedImage;

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.UIManager;

public class SimplePaint02 {

    private static final int LINE_THICKNESS = 4;
    private static final int LINE_GAP = 10;
    private Color lineColor = Color.red;

    public static void main(String[] args) {
        new SimplePaint02();
    }

    public SimplePaint02() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                } catch (Exception ex) {
                }

                JFrame frame = new JFrame();
                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 {

        @Override
        public Dimension getPreferredSize() {
            return new Dimension(100,100);
        }

        @Override
        public void paintComponent(Graphics g) {

            int radius = 50;
            BufferedImage buffer = new BufferedImage(radius,radius,BufferedImage.TYPE_INT_ARGB);
            Graphics2D g2d = buffer.createGraphics();
            g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON);
        g2d.setRenderingHint(RenderingHints.KEY_INTERPOLATION,RenderingHints.VALUE_INTERPOLATION_BILINEAR);

            Ellipse2D circle = new Ellipse2D.Float(0,radius);
            Shape clip = g2d.getClip();
            g2d.setClip(circle);
            AffineTransform at = g2d.getTransform();

            g2d.setTransform(AffineTransform.getRotateInstance(Math.toRadians(45),radius / 2,radius / 2));

            int gap = LINE_GAP;

            g2d.setColor(Color.WHITE);
            g2d.fill(circle);

            g2d.setColor(lineColor);
            //g2d.setStroke(new BasicStroke(LINE_THICKNESS));
            for (int index = 0; index < 10; index++) {
                int x1 = index*gap-(LINE_THICKNESS/2);
                int y1 = 0;
                int x2 = index*gap+(LINE_THICKNESS/2);
                int y2 = radius;
                int width = x2 - x1;
                int height = y2 - y1;

                g2d.fillRect(x1,y1,width,height);
                //g2d.drawLine(index * gap,index * gap,getRadius());
            }

            g2d.setTransform(at);
            g2d.setClip(clip);
            g2d.dispose();
            g.drawImage(buffer,this);
        }

    }

}

解决方法

当我尝试同样的事情时,我得到了顺利的优势：

g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON);

import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.image.BufferedImage;
import java.io.File;
import javax.imageio.ImageIO;

public class DrawSmoothCircle {
    public static void main(String[] argv) throws Exception {
        BufferedImage bufferedImage = new BufferedImage(100,100,BufferedImage.TYPE_INT_RGB);
        Graphics2D g2d = bufferedImage.createGraphics();

        g2d.setRenderingHint (RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON);
        g2d.setPaint(Color.green);
        g2d.fillOval(10,10,50,50);
        g2d.dispose();

        ImageIO.write(bufferedImage,"png",new File("e:newimage.png"));
    }
}

更新：

搜索了很多：

代码没有错,但是,

好吧,不幸的是Java 2D(或者至少Sun目前的实现)不支持“软剪辑”.

但也有一个技巧的剪辑：
按照This link,您可以实现您的要求.

(另外,我有一个平滑的边缘,因为我不会使用剪辑的东西,在我上面的图像)

（编辑：安卓应用网）

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