在Java中绘制一个很好的圆圈 [英] Drawing a nice circle in Java
本文介绍了在Java中绘制一个很好的圆圈的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我使用的是Java Graphics，并且一直在收到丑陋的圈子。
这是我的Java程序使
以下是在Matlab中制作的相同内容
这里有一个独立的主要功能，您可以运行它来测试。
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（）;
$ b public public SimplePaint02（）{
EventQueue.invokeLater（new Runnable（）{
@Override
public void run（）{
试试{
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（0，0，radius，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，0，index * gap，getRadius（））;
}
g2d.setTransform（at）;
g2d.setClip（clip）;
g2d.dispose（）;
g.drawImage（buffer，0，0，this）;
}
}
}
解决方案
编辑：请参阅下面的代码盖伊的解答。这是标记正确的，因为Joey Rohan最初想到了它！
当我尝试使用同样的功能时，事情：
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：\\\\
ewimage.png））;
更新：
搜索完毕后：
代码没有问题，但是，
不幸的是，Java 2D（或者至少Sun当前的实现）不支持软限幅。
但是还有一个片段的技巧：
按照这链接，你可以实现你所要求的。
（另外，我有一个平滑的边缘，因为我不会使用剪辑的东西，在我的上图）
I'm using Java Graphics and I keep getting "ugly" circles.
Here's what my Java program makes
And here's the same thing being made in Matlab
I think it is clear that the Java one is not as "nice" looking as the Matlab one, particularly on the edges of the circle. Note that this has nothing to do with the resolution...these images are practically the same size. Also note that I am already setting rendering hints.
Here's a stand alone with a Main function you can run to test this out.
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, 0, radius,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, 0, index * gap, getRadius());
}
g2d.setTransform(at);
g2d.setClip(clip);
g2d.dispose();
g.drawImage(buffer, 0, 0, this);
}
}
}
解决方案
EDIT: Please see Code Guy's answer below for a solution. This is marked correct because it was Joey Rohan who figured it out initially!
I got smooth edge when i tried out same thing:
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"));
}
}
UPDATE:
After searching alot:
There is nothing wrong with the code but,
Well, unfortunately Java 2D (or at least Sun's current implementation) does not support "soft clipping."
But Also got a trick for the clips: Follow This link,you can achieve what you are asking for.
(Also, i got a smooth edge, cause i din't use clip stuff,in my above image)
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