一个痛苦的算法(swing)

import java.awt.*;
import java.awt.event.*;
public class DrawOval extends JFramwe{
    public DrawOval()
   {
        super("画圆");
        setBounds(0,0,100,100);
        setVisible(true);
    }
     public void paint(Graphics g)
     {
         g.setColor(Color.red);//画红圆
           g.drawOval(0,0,100,100);//在50，50处画一个半径为50的圆
       }
      public static void main(String[] args)
      {
         DrawOval do=new DrawOval();
       }
  }//如果能理解画圆的话，那么我绝对相信楼主有能力解决后续问题。

import java.awt.Color;
import java.awt.Graphics;
public class ArcPanel extends javax.swing.JPanel {    boolean filled;    int slice = 8;
    int n = 360 / slice;
    double counts = 4;
    int[] row;    /** Creates new form ArcPanel */
    public ArcPanel() {
        initComponents();
    }    public ArcPanel(boolean filled) {
        this.filled = filled;
    }
    @Override
    public void paint(Graphics g) {        g.setColor(Color.yellow);
        if (filled) {
            g.drawArc(0, 0, diameter, diameter, 0, n);        } else {
            g.drawArc(0, 0, diameter, diameter, 45, 45);
        }        //      在第一个扇形内画矩形（三点钟时刻开始）
        int R = diameter / 2;
        int r = (int) ((int) R * Math.tan(Math.PI / slice) * Math.tan((Math.PI / 2 - Math.PI / slice) / 2));
        //圆心1坐标（R+r/(Math.tan(Math.PI/slice)），R-r)
        //正方形1交点 (R+r/Math.tan(Math.PI/slice)-r/Math.sqrt(2),(R-r-r/Math.sqrt(2)))
        int b1 = (int) ((int) r / Math.sqrt(2));
        int ox = (int) (R + r / (Math.tan(Math.PI / slice)));
        int oy = R - r;
        int x1 = (int) ((int) R + r / Math.tan(Math.PI / slice) - r / Math.sqrt(2));
        int y1 = (int) (R - r - r / Math.sqrt(2));        g.drawOval(x1, y1, 2 * b1, 2 * b1);
        g.drawRect(x1, y1, 2 * b1, 2 * b1);        g.setColor(Color.green);
        if (filled) {
            g.fillArc(0, 0, diameter, diameter, 360 / slice, n);
        } else {
            g.drawArc(0, 0, diameter, diameter, 135, -45);
        }        //圆心2坐标（R+r,R-r/(Math.tan(Math.PI/slice))
        //正方形2交点（R+r-r/Math.sqrt(2),R-r/(Math.tan(Math.PI/slice)-r/Math.sqrt(2))
        int x2 = (int) (R + r - r / Math.sqrt(2));
        int y2 = (int) (R - r/(Math.tan(Math.PI / slice) - r / Math.sqrt(2)));
        int b2 = (int) ((int) r / Math.sqrt(2));
        System.out.println("x2:" + x2);
        g.drawRect(x2, y2, 2 * b2, 2 * b2);
        g.setColor(Color.orange);
        if (filled) {
            g.fillArc(0, 0, diameter, diameter, 2 * 360 / slice, n);
        } else {
            g.drawArc(0, 0, diameter, diameter, 135, -45);
        }
//
        g.setColor(Color.magenta);        if (filled) {
            g.fillArc(0, 0, diameter, diameter, 3 * 360 / slice, n);
        } else {
            g.drawArc(0, 0, diameter, diameter, -225, 45);
        }        g.setColor(Color.yellow);
        if (filled) {
            g.fillArc(0, 0, diameter, diameter, 4 * 360 / slice, n);
        } else {
            g.drawArc(0, 0, diameter, diameter, 225, -45);
        }
////
        g.setColor(Color.green);
        if (filled) {
            g.fillArc(0, 0, diameter, diameter, 5 * 360 / slice, n);
        } else {
            g.drawArc(0, 0, diameter, diameter, -135, 45);
        }        g.setColor(Color.orange);
        if (filled) {
            g.fillArc(0, 0, diameter, diameter, 6 * 360 / slice, n);
        } else {
            g.drawArc(0, 0, diameter, diameter, -45, -45);
        }
//
        g.setColor(Color.magenta);
        if (filled) {
            g.fillArc(0, 0, diameter, diameter, 7 * 360 / slice, 45);
        } else {
            g.drawArc(0, 0, diameter, diameter, 315, 45);
        }
    }  // end paint()    /** This method is called from within the constructor to
     * initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is
     * always regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">
    private void initComponents() {        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(this);
        this.setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 371, Short.MAX_VALUE)
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 276, Short.MAX_VALUE)
        );
    }// </editor-fold>
    // Variables declaration - do not modify
    // End of variables declaration
    }

gentalguo 帮忙解决下，我解决不了，懂的早就可以解决，不懂，始终做不出来啊，
解决了全部分都给啊。呵呵

好了好了，开玩笑的~~
package test.arc;import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;import javax.swing.Box;
import javax.swing.BoxLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JTextField;public class MultiArc extends JFrame implements ActionListener { private static final long serialVersionUID = 1L; JTextField ftf; MultiArcPanel p; public MultiArc() {
super();
setDefaultCloseOperation(EXIT_ON_CLOSE);
p = new MultiArcPanel();
Container c = getContentPane();
c.add(p, BorderLayout.CENTER); ftf = new JTextField("1", 10); JButton okButton = new JButton("OK");
okButton.addActionListener(this); Box ctrlBox = new Box(BoxLayout.X_AXIS);
ctrlBox.add(Box.createGlue());
ctrlBox.add(ftf);
ctrlBox.add(Box.createHorizontalStrut(2));
ctrlBox.add(okButton);
ctrlBox.add(Box.createGlue()); c.add(ctrlBox, BorderLayout.SOUTH); setSize(550, 450);
setVisible(true);
} public void actionPerformed(ActionEvent e) {
String text = ftf.getText();
int num = 1;
try {
num = Integer.parseInt(text);
} catch (Exception ex) {
num = 1;
} if (360 % num != 0) {
ftf.setText("1");
return;
} p.setN(num);
p.repaint(); } public static void main(String args[]) {
new MultiArc();
}
}package test.arc;import java.awt.Graphics;
import java.awt.Point;import javax.swing.JPanel;public class MultiArcPanel extends JPanel { private static final long serialVersionUID = 1L; private int n = 2; int radius; int centerX; int centerY; double inc = (2 * PI / n) % (2 * PI); private static final double PI = Math.PI; public MultiArcPanel() {
super();
} public void paint(Graphics g) { g.clearRect(0, 0, getWidth(), getHeight()); int width = getWidth() - 20;
int height = getHeight() - 20;
centerX = width / 2;
centerY = height / 2;
radius = Math.min(width, height) / 2;
g.drawOval(centerX - radius, centerY - radius, 2 * radius, 2 * radius); if (n > 1) {
double angle = 0.0;
for (int i = 0; i < n; i++) {
Point endPoint = getEndPoint(angle);
g.drawLine(centerX, centerY, endPoint.x, endPoint.y); int innerRadius = (int) (radius * Math.sin(inc / 2) / (1 + Math
.sin(inc / 2)));
Point innerCenter = getInnerCircleCenter(angle, innerRadius);
g.drawOval(innerCenter.x - innerRadius, innerCenter.y
- innerRadius, 2 * innerRadius, 2 * innerRadius);
angle += (2 * PI / n) % (2 * PI);
}
}
} private Point getEndPoint(double startAngle) {
Point rsPoint = new Point(); double endAngle = (startAngle + inc) % (2 * PI);
rsPoint.x = (int) (centerX + radius * Math.cos(endAngle));
rsPoint.y = (int) (centerY + radius * Math.sin(endAngle));
return rsPoint;
} public void setN(int n) {
this.n = n;
inc = (2 * PI / n) % (2 * PI);
} private Point getInnerCircleCenter(double startAngle, int innerRadius) {
Point rsPoint = new Point();
rsPoint.x = (int) (centerX + (radius - innerRadius)
* Math.cos(startAngle + inc / 2));
rsPoint.y = (int) (centerY + (radius - innerRadius)
* Math.sin(startAngle + inc / 2));
return rsPoint;
}
}
两个类~~^_^
加油~~共同学习，共同进步。

gentalguo 好神速啊，非常感谢啊，我去试运行下。嘿嘿，多谢啊！

gentalguo,你运行没有报错？我运行报错了哦！
Exception in thread "main" java.lang.ExceptionInInitializerError
        at test.arc.MultiArc.<init>(MultiArc.java:32)
        at test.arc.MultiArc.main(MultiArc.java:74)
Caused by: java.lang.RuntimeException: Uncompilable source code - 类 MultiArcPanel 是公共的，应在名为 MultiArcPanel.java 的文件中声明
        at graphics1.MultiArcPanel.<clinit>(MultiArcPanel%20.java:8)
        ... 2 more

jdk1.6,eclipse3.2，我的环境啊
奇怪~~

刚运行过了。完全可以。你把包去掉，然后直接用dos就可以编译了。

调试易

一个痛苦的算法(swing)

解决方案 »