旋轉關於中心的圖表

我想旋轉關於他中心的餅圖，我該怎麼做？我想旋轉整個餅圖。這是我的代碼：旋轉關於中心的圖表

import java.awt.*; 
import java.awt.event.MouseAdapter; 
import java.awt.event.MouseEvent; 
import java.awt.event.MouseListener; 
import java.awt.event.MouseMotionListener; 
import java.util.Random; 
import javax.swing.JComponent; 
import javax.swing.JFrame; 

class Slice{ 

    double value; 
    Color color; 
    public Slice(double _value){ 
     Random numGen = new Random(); 
     int R = numGen.nextInt(256); 
     int G = numGen.nextInt(256); 
     int B = numGen.nextInt(256); 
     this.setColor(new Color(R,G,B)); 
     this.value = _value;  
    } 
    public void setColor(Color _color){ 
     this.color = _color; 

    } 
} 



class Component extends JComponent { 

    int movx = 0; 
    int movy = 0; 
    private double angle = 0; 
    private double radius = 0.0D; 
    private Random numGen; 
    private int w = 500; 
    private int h = 500; 



    Slice[] slice = {new Slice(5),new Slice(20),new Slice(33),new Slice(42)}; 
    public Component(){ 
     numGen = new Random(); 
     Listener listener = new Listener(); 
     addMouseListener(listener); 
     addMouseMotionListener(listener); 
    } 

    class Listener extends MouseAdapter{ 
     private double LastAngle; 
     @Override 
     public void mousePressed(MouseEvent e) { 
      LastAngle = getAngle(e.getPoint()); 
     } 
     @Override 
     public void mouseDragged(MouseEvent e) { 
      double curAngle = getAngle(e.getPoint()); 
      double deltaAngle = curAngle - LastAngle; 
      angle += deltaAngle; 
      repaint(); 
      LastAngle = curAngle; 
     } 
     private double getAngle(Point point) { 
      double x = point.getX() - 0.5 * 500; 
      double y = point.getY() - 0.5 * 500; 
      return Math.atan2(y, x); 
     } 

    } 

    public void paint(Graphics g){ 
     Graphics2D g2 = (Graphics2D)g; 
     //g2.translate(250, 250); 
     g2.rotate(angle,w/2-5,h/2-5); 
     drawPie(g2, getBounds(), slice); 

    } 
    public void drawPie(Graphics2D g, Rectangle area, Slice[] s){ 
     double total = 0.0D; 

     //calculate total value 
     for(int i=0;i<s.length;i++) 
      total+=s[i].value; 
     radius = total/2*Math.PI; 
     double curentValue = 0.0D; 
     int startAngle = 0; 
     for(int i = 0;i<s.length;i++){ 

      //s[i].setColor(new Color(numGen.nextInt(256), numGen.nextInt(256), numGen.nextInt(256))); 
      startAngle = (int)((curentValue*360)/total); 
      int arcAngle = (int)((s[i].value*360)/total) ; 
      g.setColor(s[i].color); 
      //g.rotate(angle);//row AA 
      for(int j=1;j>0;j--){ 
      g.fillArc(j, j, w, h, startAngle, arcAngle); 

      } 
      curentValue+=s[i].value; 

     } 
    } 


} 

public class PieChart { 

    /** 
    * @param args 
    */ 
    public static void main(String[] args) { 
     // TODO Auto-generated method stub 
     JFrame frame = new JFrame(); 
     frame.getContentPane().add(new Component()); 
     frame.setSize(600,600); 
     frame.setVisible(true); 
    } 
}

我該怎麼做。我寫w/2，h/2，因爲在fillArc中，我寫寬度和高度爲500，但它不圍繞中心旋轉。

來源

2012-11-17 Vahe Akhsakhalyan

我想這一切都是關於vmware的採訪任務嗎？ – vach