java 画饼图和图案

一。
饼图

import java.awt.*;import javax.swing.*;import java.awt.event.*;import java.math.*;import java.util.*;import java.awt.geom.Arc2D;import java.awt.geom.*;import java.awt.Polygon;import java.util.Date;

public class CakeChart extends JFrame { // 初始数据   private double data[] = { 100., 150, 113., 127., 299.234, 120., 93., 123.,           127., 199., 157., 189. };

   private String percent[] = new String[data.length]; // 每个数据所占百分比 private int radian[] = new int[data.length]; // 每个数据所对应的弧度数  private double max, min;  // 初始化每块饼的颜色  private int dia = 240;// 设置饼图透明度 private Color c1 = new Color(0, 255, 0, dia);    private Color c2 = new Color(255, 255, 0, dia);  private Color c3 = new Color(255, 0, 0, dia);    private Color c4 = new Color(255, 128, 64, dia); private Color c5 = new Color(255, 128, 255, dia);    private Color c6 = new Color(255, 0, 128, dia);  private Color c7 = new Color(233, 124, 24, dia); private Color c8 = new Color(204, 119, 115, dia);    private Color c9 = new Color(89, 159, 230, dia); private Color c10 = new Color(148, 140, 179, dia);   private Color c11 = new Color(128, 0, 64, dia);  private Color c12 = new Color(174, 197, 208, dia);   private Color colors[] = { c1, c2, c3, c12, c11, c6, c4, c8, c9, c10, c5,            c7 };

   // 统计图的宽度和高度  private int width = 800; private int height = 450;    // 定义标题起始坐标变量 private int titleStart_x; private int titleStart_y; // 定义圆心坐标 private int oval_x = 60; private int oval_y = 90; // 定义椭圆的长轴和短轴 private int long_axes = 280; private int short_axes = 200;    // 定义图例区域起点坐标 private int cutlineRect_x = 70;  private int cutlineRect_y = 450; // 定义图倒区域矩形的宽度和高度 private int cutlineRect_width = 100; private int cutlineRect_heigth = 235;    // 定义日期变量 private Date date = new Date();  // 定义统计图其他显示信息的超始坐标   private int otherInfo_x1; private int otherInfo_y1; private int otherInfo_x2; private int otherInfo_y2; private int otherInfo_x3; private int otherInfo_y3; // 定义标题\X\Y轴信息    private String title = "服务器流量统计   (饼形统计图)   "; private String otherInfo1 = "很经典的的一个统计饼图!!";   private String otherInfo2 = "www.eduwest.com"; private String otherInfo3 = "绘图日期：";    // 双缓冲设置  private Image offScreenImage = null; private Graphics offScreenBuffer = null; public CakeChart() {      super("数量统计饼图");        setSize(800, 500);        setLocation(100, 177);        setResizable(true);       setVisible(true);     // setBackground(Color.pink);     init();   }

   public void init() {      offScreenImage = this.createImage(width, height);        offScreenBuffer = offScreenImage.getGraphics();      NumberBudget();       CoorBudget(); }

   public void NumberBudget() {

        // 求数据中的最大值和最小值       max = data[0];       min = data[0];       for (int mm = 0; mm < data.length; mm++) {          if (data[mm] > max)                max = data[mm];          if (data[mm] < min)                min = data[mm];      }     // 对数据进行求和运算      float allData_sum = 0;       for (int s = 0; s < data.length; s++) {         allData_sum += data[s];     }     // 计算每个数据占总数的百分比      for (int p = 0; p < data.length; p++) {         percent[p] = String                  .valueOf(Math.round(data[p] / allData_sum * 100))                 + "%";     }

       // 计算每个数据所对应的弧度数      for (int r = 0; r < data.length; r++) {         radian[r] = Math.round((float) data[r] / allData_sum * 360);     } }

   public void CoorBudget() {        // 预算标题信息的起始坐标        titleStart_x = 22;       titleStart_y = (width / 2) - (title.length() * 15 / 2);      // 初始化统计图其他显示信息的起始坐标(位置固定)        otherInfo_x1 = 390;      otherInfo_y1 = 450;      otherInfo_x2 = 400;      otherInfo_y2 = 480;      otherInfo_x3 = 390;      otherInfo_y3 = 5;    }

   public void update(Graphics g) {      paint(g); }

   public void paint(Graphics g) {       PaintBackground(offScreenBuffer);     PaintChart(offScreenBuffer);      g.drawImage(offScreenImage, 0, 0, this);  }

   public void PaintBackground(Graphics g) {     // 渐变背景初始颜色       Color BackStartColor = Color.white;      Color BackLastColor = new Color(162, 189, 230);      Color titleColor = Color.black;      Color otherInfoColor = new Color(41, 78, 118);       // 标题背景颜色     Color titleBackColor = new Color(147, 179, 225);     // 统计图中心区域颜色      Color cutlineColor = new Color(0, 128, 255, 50);     // 图例数据颜色     Color cutDataColor = Color.white;

      Font titleFont = new Font("黑体", Font.BOLD, 18);        Font otherFont = new Font("宋体", Font.PLAIN, 12);       String year = "";      String month = "";     String day = "";       Graphics2D g2 = (Graphics2D) g;      RenderingHints hints = new RenderingHints(null);     hints.put(RenderingHints.KEY_ANTIALIASING,                RenderingHints.VALUE_ANTIALIAS_ON);       g2.setRenderingHints(hints);

        GradientPaint gradient = new GradientPaint(0, 0, BackStartColor, 0,              400, BackLastColor, false);       g2.setPaint(gradient);        Rectangle2D rect = new Rectangle2D.Double(0, 0, width, height);      g2.fill(rect);        // 绘制标题背景     g2.setColor(titleBackColor);      g2.fill3DRect(0, 0, width, 30, true);     // 绘制图例区域背景       g2.setColor(cutlineColor);        g2.fillRect(cutlineRect_y, cutlineRect_x, cutlineRect_width,              cutlineRect_heigth);      g2.setColor(Color.white);     g2.drawRect(cutlineRect_y, cutlineRect_x, cutlineRect_width,              cutlineRect_heigth);      // 绘制统计图标题        g2.setFont(titleFont);        g2.setColor(titleColor);      g2.drawString(title, titleStart_y, titleStart_x);

       // 显示绘制日期     year = Integer.toString(1900 + date.getYear());     month = Integer.toString(date.getMonth() + 1);      day = Integer.toString(date.getDate());      g2.drawString(year + "年" + month + "月" + day + "日", otherInfo_y3 + 60,                otherInfo_x3);        // 显示数据百分比        int colorRectWH = 15;        int space = 5; // 图例中小色块之间的间隔距离      int addData = cutlineRect_x;     for (int i = 0; i < data.length; i++) {         g2.setColor(colors[i]);           g2.fill3DRect(cutlineRect_y, addData, colorRectWH, colorRectWH,                   true);            if (data[i] == max || data[i] == min)             g2.setColor(Color.red);           else              g2.setColor(cutDataColor);            g2.drawString(String.valueOf(data[i]) + "   (" + percent[i] + ")",                 cutlineRect_y + 20, addData + colorRectWH - space);         addData += colorRectWH + space;        } }

   public void PaintChart(Graphics g) {      int start = 0;       int rVal = 192;      int gVal = 192;      int bVal = 192;      int frameCount = 60;     Graphics2D g2 = (Graphics2D) g;      RenderingHints hints = new RenderingHints(null);     hints.put(RenderingHints.KEY_ANTIALIASING,                RenderingHints.VALUE_ANTIALIAS_ON);       g2.setRenderingHints(hints);

        for (int t = 20; t >= 0; t--) {          rVal = t * 255 / frameCount;         gVal = t * 255 / frameCount;         bVal = t * 255 / frameCount;         g2.setColor(new Color(rVal, gVal, bVal, 50));         g2.drawOval(oval_x, oval_y + t, long_axes, short_axes);      }     for (int a = 0; a < data.length; a++) {         Arc2D arc = new Arc2D.Float(Arc2D.PIE);          g2.setColor(colors[a]);           arc.setFrame(oval_x, oval_y, long_axes, short_axes);          arc.setAngleStart(start);         arc.setAngleExtent(radian[a]);            g2.fill(arc);         if (data[a] == max || data[a] == min)             g2.setColor(Color.white);         else              g2.setColor(new Color(223, 223, 223, 150));           g2.draw(arc);         start += radian[a];     } }

   public static void main(String[] arsg) {      try {         CakeChart cake = new CakeChart();        } catch (Exception exe) {     } }

}

二。
图案

//Julia集放大  /*   最近在看分行算法这本书,才发现原来数学公式也能构造这么艺术的东西.都怪当年数学没好好学,看起来特费劲.   特发个applet程序给大家一起来看看   钟伟海(newwei2001@yahoo.com.cn)  */  import  java.awt. *;  import  java.applet. *;  import  java.awt.event. *;  public  class  Juliazoom  extends  Applet  implements  MouseListener , MouseMotionListener   {       private  final  int  MAX  = 256 ;       private  final  double  SX  = -1.0 ;       // 实部的最小值       private  final  double  SY  = -1.5 ;       // 虚部的最小值       private  final  double  EX  = 2.0 ;       // 实部的最大值       private  final  double  EY  = 1.5 ;       // 虚部的最大值       private  static  int  picX , picY , xs , ys , xe , ye ;       private  static  double  x1 , y1 , x2 , y2 , p , q ,xb ,yb ;       private  static  boolean  action , rechteck , fertig , stopit ;       private  static  float  xy ;       private  Image  bild ;       private  Graphics  g1 ;       private  Cursor  c1 , c2 ;       public  void  init () // 初始化所有实例

      {           p  = -0.46 ;           q  = 0.57 ;           fertig  = false ;           addMouseListener (this );           addMouseMotionListener (this );           c1  = new  Cursor (Cursor.WAIT_CURSOR );           c2  = new  Cursor (Cursor.CROSSHAIR_CURSOR );           picX  = getSize ().width ;           picY  = getSize ().height ;           xy  = (float )picX  / (float )picY ;           bild  = createImage (picX , picY );           g1  = bild.getGraphics ();           fertig  = true ;

      } public  void  destroy () // 删除所有实例 

      {           if  (fertig )           {               removeMouseListener (this );               removeMouseMotionListener (this );               bild  = null ;               g1  = null ;               c1  = null ;               c2  = null ;               System.gc ();

          }       } public  void  start ()       {           action  = false ;           rechteck  = false ;           stopit  = false ;           startwerte ();           xb  = (x2  - x1 ) / (double )picX ;           yb  = (y2  - y1 ) / (double )picY ;           julia ();

      } public  void  stop ()       {

      } public  void  paint (Graphics  g )       {           update (g );

      } public  void  update (Graphics  g )       {           g.drawImage (bild , 0 , 0 , this );           if  (rechteck )           {               g.setColor (Color.white );               if  (xs  < xe )               {                   if  (ys  < ye ) g.drawRect (xs , ys , (xe  - xs ), (ye  - ys ));                   else  g.drawRect (xs , ye , (xe  - xs ), (ys  - ye ));

              } else                {                   if  (ys  < ye ) g.drawRect (xe , ys , (xs  - xe ), (ye  - ys ));                   else  g.drawRect (xe , ye , (xs  - xe ), (ys  - ye ));

              }           }       } private  void  julia () // 计算所有的点

      {           int  x , y ;           float  h , b , alt  = 0.0f ;           action  = false ;           setCursor (c1 );           showStatus ("正在计算julia集，请等待");           p  = -0.46 ;           q  = 0.57 ;           for  (x  = 0 ; x  < picX ; x +=2 )           {               for  (y  = 0 ; y  < picY ; y ++)               {                   h  = punktfarbe (x1  + xb  * (double )x , y1  + yb  * (double )y ,p ,q );                   // 颜色值                   if  (h  != alt )                   {                       b  = 1.0f  - h  * h ;                       g1.setColor (Color.getHSBColor ( h ,1 ,b ));                       alt  = h ;

                  } g1.drawLine (x , y , x  + 1 , y );

              } showStatus ( "At " + x  + " of " + picX  );               if  (stopit ) x  = picX ;

          } if  (stopit )           {               showStatus ("Aborted");               stopit  = false ;

          } else            {               showStatus ("julia集已准备好，请用鼠标选择放大区域.");

          } setCursor (c2 );           action  = true ;

      } // 由迭代产生的0.0到1.0的颜色值       private  float  punktfarbe (double  x0 , double  y0 ,double  p ,double  q )       {           double  r  = 0.0 , xk  = 0 , yk  = 0 ;           int  j  = 0 ;           while  ((j  < MAX ) &&  (r  < 4.0 ))           {               xk  = x0  * x0  - y0  * y0  + p ;               yk  = 2.0  * x0  * y0  + q ;               j ++;               r  = yk  * yk  + xk  * xk ;               x0  = xk ;               y0  = yk ;

          } return  (float )j  / (float )MAX ;

      } private  void  startwerte () // 重新开始值

      {           x1  = SX ;           y1  = SY ;           x2  = EX ;           y2  = EY ;           if  ((float )((x2  - x1 ) / (y2  - y1 )) != xy  ) x1  = x2  - (y2  - y1 ) * (double )xy ;

      } public  void  mousePressed (MouseEvent  e )       {           e.consume ();           if  (action )           {               xs  = e.getX ();               ys  = e.getY ();

          }       } public  void  mouseReleased (MouseEvent  e )       {           int  z , w ;           e.consume ();           if  (action )           {               xe  = e.getX ();               ye  = e.getY ();               if  (xs  > xe )               {                   z  = xs ;                   xs  = xe ;                   xe  = z ;

              } if  (ys  > ye )               {                   z  = ys ;                   ys  = ye ;                   ye  = z ;

              } w  = (xe  - xs );               z  = (ye  - ys );               if  ((w  < 2 ) &&  (z  < 2 )) startwerte ();               else                {                   if  (((float )w  > (float )z  * xy )) ye  = (int )((float )ys  + (float )w  / xy );                   else  xe  = (int )((float )xs  + (float )z  * xy );                   x2  = x1  + xb * (double )xe ;                   y2  = y1  + yb  * (double )ye ;                   x1  += xb  * (double )xs ;                   y1  += yb  * (double )ys ;

              } xb  = (x2  - x1 ) / (double )picX ;               yb  = (y2  - y1 ) / (double )picY ;               julia ();               rechteck  = false ;               repaint ();

          } else            {               stopit  = true ;

          }       } public  void  mouseEntered (MouseEvent  e )       {

      } public  void  mouseExited (MouseEvent  e )       {

      } public  void  mouseClicked (MouseEvent  e )       {

      } public  void  mouseDragged (MouseEvent  e )       {           e.consume ();           if  (action )           {               xe  = e.getX ();               ye  = e.getY ();               rechteck  = true ;               repaint ();

          }       } public  void  mouseMoved (MouseEvent  e )       {

      }   }

三。
五星红旗

/**   使用Java2D绘制五星红旗   五星红旗的绘制标准见百度百科: http://baike.baidu.com/view/5163.htm   注意: 该处对于第一颗小星的位置说明有误,应将“左五右十”改成“左十右五”   @author  Eastsun   @version 2008/10/17 1.0   */import javax.swing.*;import java.awt.geom.*;import java.awt.*;

public class NationalFlag extends JPanel {

  public static void main(String[] args) {      JFrame frame = new JFrame("五星红旗 By Eastsun");      frame.getContentPane().add(new NationalFlag(600));        frame.pack();     frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);     frame.setLocationRelativeTo(null);        frame.setVisible(true);   }

   /**    * 创建一个五角星形状. 该五角星的中心坐标为(sx,sy),中心到顶点的距离为radius,其中某个顶点与中心的连线的偏移角度为theta(弧度)    *     * @return pentacle 一个☆   */   public static Shape createPentacle(double sx, double sy, double radius,           double theta) {       final double arc = Math.PI / 5;      final double rad = Math.sin(Math.PI / 10) / Math.sin(3 * Math.PI / 10);      GeneralPath path = new GeneralPath();        path.moveTo(1, 0);        for (int idx = 0; idx < 5; idx++) {         path.lineTo((float)(rad * Math.cos((1 + 2 * idx) * arc)),(float) (rad                    * Math.sin((1 + 2 * idx) * arc)));           path.lineTo((float)Math.cos(2 * (idx + 1) * arc), (float)Math.sin(2 * (idx + 1)                 * arc));      }     path.closePath();     AffineTransform atf = AffineTransform.getScaleInstance(radius, radius);      atf.translate(sx / radius, sy / radius);      atf.rotate(theta);        return atf.createTransformedShape(path);  }

   private int width, height;

  private double maxR = 0.15, minR = 0.05;

  private double maxX = 0.25, maxY = 0.25;

  private double[] minX = { 0.50, 0.60, 0.60, 0.50 };

    private double[] minY = { 0.10, 0.20, 0.35, 0.45 };

    /**    * 创建一个宽度为width的国旗     */   public NationalFlag(int width) {      this.width = width / 3 * 3;      this.height = width / 3 * 2;     setPreferredSize(new Dimension(this.width, this.height)); }

   protected void paintComponent(Graphics g) {       Graphics2D g2d = (Graphics2D) g;

       // 画旗面        g2d.setPaint(Color.RED);      g2d.fillRect(0, 0, width, height);

      // 画大☆        double ox = height * maxX, oy = height * maxY;      g2d.setPaint(Color.YELLOW);       g2d.fill(createPentacle(ox, oy, height * maxR, -Math.PI / 2));

      // 画小★        for (int idx = 0; idx < 4; idx++) {         double sx = minX[idx] * height, sy = minY[idx] * height;            double theta = Math.atan2(oy - sy, ox - sx);         g2d.fill(createPentacle(sx, sy, height * minR, theta));       } }}

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