java 生成电子印章代码

柔光的暖阳◎ 2022-12-29 09:09 335阅读 0赞

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;
    
    //java项目www.fhadmin.org
    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;
        }
    }

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