java-生成印章swing

案例1

package com;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.font.FontRenderContext;
import java.awt.geom.AffineTransform;
import java.awt.geom.Ellipse2D;
import java.awt.geom.Rectangle2D;

import javax.swing.JFrame;
import javax.swing.JPanel;

public class Test2 {
       public static void main(String[] args)
       {
          DrawFrame frame = new DrawFrame();
          frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
          frame.setVisible(true);
       }
    }

    /**
       A frame that contains a panel with drawings
    */
    class DrawFrame extends JFrame
    {
       public DrawFrame()
       {
          setTitle("DrawTest");
          setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);

          // add panel to frame
          DrawPanel panel = new DrawPanel();
          panel.setBackground(Color.WHITE);
          setLocationRelativeTo(null);
          add(panel, BorderLayout.CENTER);
       }

       public static final int DEFAULT_WIDTH = 320;
       public static final int DEFAULT_HEIGHT = 340;
    }

    /**
       A panel that displays rectangles and ellipses.
    */
    class DrawPanel extends JPanel
    {
        private String message = "公章测试有限公司";

        public void paintComponent(Graphics g)
        {
            super.paintComponent(g);
            Graphics2D g2 = (Graphics2D) g;
            g2.setColor(Color.RED);
            g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);

            //绘制圆
            int radius = 150;
            Ellipse2D circle = new Ellipse2D.Double();
            circle.setFrameFromCenter(CENTERX, CENTERY, CENTERX + radius, CENTERY + radius);
            g2.draw(circle);

            //绘制中间的五角星
            Font starFont = new Font("宋体", Font.BOLD, 120);
            g2.setFont(starFont);
            g2.drawString("★", CENTERX - 60, CENTERY + 40);    

            //根据输入字符串得到字符数组
            String[] messages2 = message.split("",0);
            String[] messages = new String[messages2.length-1];
            System.arraycopy(messages2,1,messages,0,messages2.length-1);

            //输入的字数
            int ilength = messages.length;

            //设置字体属性
            int fontsize = 40;
            Font f = new Font("Serif", Font.BOLD, fontsize);

            FontRenderContext context = g2.getFontRenderContext();
            Rectangle2D bounds = f.getStringBounds(message, context);

            //字符宽度＝字符串长度/字符数
            double char_interval = (bounds.getWidth() / ilength);
            //上坡度
            double ascent = -bounds.getY();

            int first = 0,second = 0;
            boolean odd = false;
            if (ilength%2 == 1)
            {
                first = (ilength-1)/2;
                odd = true;
            }
            else
            {
                first = (ilength)/2-1;
                second = (ilength)/2;
                odd = false;
            }

            double radius2 = radius - ascent;
            double x0 = CENTERX;
            double y0 = CENTERY - radius + ascent;
            //旋转角度
            double a = 2*Math.asin(char_interval/(2*radius2));

            if (odd)
            {
                g2.setFont(f);
                g2.drawString(messages[first], (float)(x0 - char_interval/2), (float)y0);

                //中心点的右边
                for (int i=first+1;i<ilength;i++)
                {
                    double aa = (i - first) * a;
                    double ax = radius2 * Math.sin(aa);
                    double ay = radius2 - radius2 * Math.cos(aa);
                    AffineTransform transform = AffineTransform.getRotateInstance(aa);//,x0 + ax, y0 + ay);
                    Font f2 = f.deriveFont(transform);
                    g2.setFont(f2);
                    g2.drawString(messages[i], (float)(x0 + ax - char_interval/2* Math.cos(aa)), (float)(y0 + ay - char_interval/2* Math.sin(aa)));
                }
                //中心点的左边
                for (int i=first-1;i>-1;i--)
                {
                    double aa = (first - i) * a;
                    double ax = radius2 * Math.sin(aa);
                    double ay = radius2 - radius2 * Math.cos(aa);
                    AffineTransform transform = AffineTransform.getRotateInstance(-aa);//,x0 + ax, y0 + ay);
                    Font f2 = f.deriveFont(transform);
                    g2.setFont(f2);
                    g2.drawString(messages[i], (float)(x0 - ax - char_interval/2* Math.cos(aa)), (float)(y0 + ay + char_interval/2* Math.sin(aa)));
                }

            }
            else
            {
                //中心点的右边
                for (int i=second;i<ilength;i++)
                {
                    double aa = (i - second + 0.5) * a;
                    double ax = radius2 * Math.sin(aa);
                    double ay = radius2 - radius2 * Math.cos(aa);
                    AffineTransform transform = AffineTransform.getRotateInstance(aa);//,x0 + ax, y0 + ay);
                    Font f2 = f.deriveFont(transform);
                    g2.setFont(f2);
                    g2.drawString(messages[i], (float)(x0 + ax - char_interval/2* Math.cos(aa)), (float)(y0 + ay - char_interval/2* Math.sin(aa)));
                }

                //中心点的左边
                for (int i=first;i>-1;i--)
                {
                    double aa = (first - i + 0.5) * a;
                    double ax = radius2 * Math.sin(aa);
                    double ay = radius2 - radius2 * Math.cos(aa);
                    AffineTransform transform = AffineTransform.getRotateInstance(-aa);//,x0 + ax, y0 + ay);
                    Font f2 = f.deriveFont(transform);
                    g2.setFont(f2);
                    g2.drawString(messages[i], (float)(x0 - ax - char_interval/2* Math.cos(aa)), (float)(y0 + ay + char_interval/2* Math.sin(aa)));
                }
            }

        }
        public static final int CENTERX = 150;
           public static final int CENTERY = 150;  }

案例2，生产图导出

package com.hwaggLee.swing.graphics2D;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.font.FontRenderContext;
import java.awt.geom.AffineTransform;
import java.awt.geom.Ellipse2D;
import java.awt.geom.Rectangle2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.util.Date;

import javax.imageio.ImageIO;

public class UtilsGraphics2D {

    private static final int WIDTH = 500;//图片宽度
    private static final int HEIGHT = 500;//图片高度
    private static String message = "公章测试有限公司";
    private static String centerName = "我是谁";
    private static String year = "2016年06月23日";

    public static void main(String[] args) throws Exception{
        BufferedImage image = startGraphics2D();
        try {
            String filePath = "C:\\Users\\huage\\Desktop\\121231\\"+new Date().getTime()+".png";
            ImageIO.write(image, "png", new File(filePath)); //将其保存在C:\\Users\\huage\\Desktop\\121231\\下
        } catch (Exception ex) {
            ex.printStackTrace();
        }

    }

    public static BufferedImage startGraphics2D(){
        // 定义图像buffer
        BufferedImage buffImg = new BufferedImage(WIDTH, HEIGHT, BufferedImage.TYPE_INT_RGB);
        Graphics2D g = buffImg.createGraphics();
        g.setColor(Color.RED);
        //设置锯齿圆滑
        g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);

        //绘制圆
        int radius = HEIGHT/3;//周半径
        int CENTERX = WIDTH/2;//画图所出位置
        int CENTERY = HEIGHT/2;//画图所处位置

        Ellipse2D circle = new Ellipse2D.Double();
        circle.setFrameFromCenter(CENTERX, CENTERY, CENTERX + radius, CENTERY + radius);
        g.draw(circle);

        //绘制中间的五角星
        g.setFont(new Font("宋体", Font.BOLD, 120));
        g.drawString("★", CENTERX-(120/2), CENTERY+(120/3));    

        //添加姓名
        g.setFont(new Font("宋体", Font.LAYOUT_LEFT_TO_RIGHT, 30));// 写入签名
        g.drawString(centerName, CENTERX -(40), CENTERY +(30+50));

        //添加年份
        g.setFont(new Font("宋体", Font.LAYOUT_LEFT_TO_RIGHT, 20));// 写入签名
        g.drawString(year, CENTERX -(60), CENTERY +(30+80));

        //根据输入字符串得到字符数组
        String[] messages2 = message.split("",0);
        String[] messages = new String[messages2.length-1];
        System.arraycopy(messages2,1,messages,0,messages2.length-1);

        //输入的字数
        int ilength = messages.length;

        //设置字体属性
        int fontsize = 40;
        Font f = new Font("Serif", Font.BOLD, fontsize);

        FontRenderContext context = g.getFontRenderContext();
        Rectangle2D bounds = f.getStringBounds(message, context);

        //字符宽度＝字符串长度/字符数
        double char_interval = (bounds.getWidth() / ilength);
        //上坡度
        double ascent = -bounds.getY();

        int first = 0,second = 0;
        boolean odd = false;
        if (ilength%2 == 1)
        {
            first = (ilength-1)/2;
            odd = true;
        }
        else
        {
            first = (ilength)/2-1;
            second = (ilength)/2;
            odd = false;
        }

        double radius2 = radius - ascent;
        double x0 = CENTERX;
        double y0 = CENTERY - radius + ascent;
        //旋转角度
        double a = 2*Math.asin(char_interval/(2*radius2));

        if (odd)
        {
            g.setFont(f);
            g.drawString(messages[first], (float)(x0 - char_interval/2), (float)y0);

            //中心点的右边
            for (int i=first+1;i<ilength;i++)
            {
                double aa = (i - first) * a;
                double ax = radius2 * Math.sin(aa);
                double ay = radius2 - radius2 * Math.cos(aa);
                AffineTransform transform = AffineTransform.getRotateInstance(aa);//,x0 + ax, y0 + ay);
                Font f2 = f.deriveFont(transform);
                g.setFont(f2);
                g.drawString(messages[i], (float)(x0 + ax - char_interval/2* Math.cos(aa)), (float)(y0 + ay - char_interval/2* Math.sin(aa)));
            }
            //中心点的左边
            for (int i=first-1;i>-1;i--)
            {
                double aa = (first - i) * a;
                double ax = radius2 * Math.sin(aa);
                double ay = radius2 - radius2 * Math.cos(aa);
                AffineTransform transform = AffineTransform.getRotateInstance(-aa);//,x0 + ax, y0 + ay);
                Font f2 = f.deriveFont(transform);
                g.setFont(f2);
                g.drawString(messages[i], (float)(x0 - ax - char_interval/2* Math.cos(aa)), (float)(y0 + ay + char_interval/2* Math.sin(aa)));
            }

        }
        else
        {
            //中心点的右边
            for (int i=second;i<ilength;i++)
            {
                double aa = (i - second + 0.5) * a;
                double ax = radius2 * Math.sin(aa);
                double ay = radius2 - radius2 * Math.cos(aa);
                AffineTransform transform = AffineTransform.getRotateInstance(aa);//,x0 + ax, y0 + ay);
                Font f2 = f.deriveFont(transform);
                g.setFont(f2);
                g.drawString(messages[i], (float)(x0 + ax - char_interval/2* Math.cos(aa)), (float)(y0 + ay - char_interval/2* Math.sin(aa)));
            }

            //中心点的左边
            for (int i=first;i>-1;i--)
            {
                double aa = (first - i + 0.5) * a;
                double ax = radius2 * Math.sin(aa);
                double ay = radius2 - radius2 * Math.cos(aa);
                AffineTransform transform = AffineTransform.getRotateInstance(-aa);//,x0 + ax, y0 + ay);
                Font f2 = f.deriveFont(transform);
                g.setFont(f2);
                g.drawString(messages[i], (float)(x0 - ax - char_interval/2* Math.cos(aa)), (float)(y0 + ay + char_interval/2* Math.sin(aa)));
            }
        }

        return buffImg;
    }
}