Java 怎么画出比较精细的圆

Question

我用Graphics和Graphics2D，画的圆都比较粗糙，锯齿很明显啊，尤其食圆比较小的时候，我想问一下，是Java画的圆本来就粗糙还是需要什么技巧，怎么样才能画出比较好看的圆形。谢谢

Answer 1

import java.awt.Color; 
import java.awt.Graphics; 
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.geom.Ellipse2D;import javax.swing.*; public class testpaint extends JFrame{
public static void main(String[] args) { 
testpaint t=new testpaint(); 
t.setLocation(100, 100); 
t.setSize(500, 400); 
t.getContentPane().setBackground(Color.green); 
t.setVisible(true); 
} 
public void paint(Graphics g){
super.paint(g);
Graphics2D g2 = (Graphics2D)g;
Ellipse2D e = new Ellipse2D.Double(10,50,70,70);
//加上下面这句就能变的圆滑了 
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
g2.setPaint(Color.RED);
g2.draw(e);
//g2.fill(e);
}
}

Answer 2

用专门的图表工具，例如chartdirector

Answer 3

我再顶，还有一个问题，我用这个方法写了两个同心圆，但是出来的效果怎么好像不同心啊
        Ellipse2D e = new Ellipse2D.Double(10,10,50,50);
        g2.draw(e);
        Ellipse2D e2 = new Ellipse2D.Double(12,12,46,46);
        g2.fill(e2);

Answer 4

Ellipse2D.Double
public Ellipse2D.Double()构造一个新 Ellipse2D，并将其初始化为：位置 (0, 0)、大小 (0, 0)。 
--------------------------------------------------------------------------------Ellipse2D.Double
public Ellipse2D.Double(double x,
                        double y,
                        double w,
                        double h)根据指定坐标构造和初始化 Ellipse2D。 参数：
x, y - 边界矩形的坐标
w - 矩形的宽度
h - 矩形的高度

Answer 5

加了0.5就同心了，不知道怎么回事        Ellipse2D e = new Ellipse2D.Double(10,10,20,20);
        g2.draw(e);
        Ellipse2D e2 = new Ellipse2D.Double(12.5,12.5,16,16);
        g2.fill(e2);

Answer 6

加入反锯齿：
import java.awt.*; Graphics2D g2 = (Graphics2D)g;
 g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);

Answer 7

bfddddddddddddddddddddddddddddddddddddd

Answer 8

sdfsdffdsfsdf

Answer 9

我也想知道，正在学习JAVA希望好心人给帮助

Answer 10

same 
import java.awt.Color; 
import java.awt.Graphics; 
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.geom.Ellipse2D;import javax.swing.*; public class testpaint extends JFrame{
    public static void main(String[] args) { 
        testpaint t=new testpaint(); 
        t.setLocation(100, 100); 
        t.setSize(500, 400); 
        t.getContentPane().setBackground(Color.green); 
        t.setVisible(true); 
    } 
    public void paint(Graphics g){
        super.paint(g);
        Graphics2D g2 = (Graphics2D)g;
        Ellipse2D e = new Ellipse2D.Double(10,50,70,70);
        //加上下面这句就能变的圆滑了 
        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
        g2.setPaint(Color.RED);
        g2.draw(e);
        //g2.fill(e);
    }
}