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 frameDrawPanel 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;}
}

转载于:https://www.cnblogs.com/hwaggLee/p/5607262.html

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