java——头像剪切功能

快来打我* 2023-02-26 13:29 10阅读 0赞

> 实现思路：  
> 在原图(image)上虚构一个长度可以伸缩的正方框，将框出来的图像切割出来作为子图(tempImage1)，子图1:1放大或缩小到要显示的大小，对子图重缩放(tempImage2)，子图(tempImage1)上再切割出图像作为要保存的图像(saveImage)；最后显示的图像是tempImage2和覆盖在上面的saveImage。

/* * To change this license header, choose License Headers in Project Properties. * To change this template file, choose Tools | Templates * and open the template in the editor. */
    
    package Body;
    
    import java.awt.Color;
    
    import java.awt.FlowLayout;
    
    import java.awt.Graphics;
    
    import java.awt.Graphics2D;
    
    import java.awt.Image;
    
    import java.awt.Toolkit;
    
    import java.awt.event.MouseAdapter;
    
    import java.awt.event.MouseEvent;
    
    import java.awt.event.MouseMotionAdapter;
    
    import java.awt.event.MouseWheelEvent;
    
    import java.awt.event.MouseWheelListener;
    
    import java.awt.image.BufferedImage;
    
    import java.awt.image.RescaleOp;
    
    import javax.swing.ImageIcon;
    
    import javax.swing.JButton;
    
    import javax.swing.JFrame;
    
    import javax.swing.JPanel;
    
    /** * * @author 心里的潇洒情 */
    
    public class CutHeadImage extends JFrame{ 
    
        private BufferedImage image;//原图
    
        private BufferedImage tempImage1;//子图
    
        private BufferedImage tempImage2;//重缩放子图
    
        private BufferedImage saveImage;
    
        private final int lenght=700;//显示大小700*700，包括2*padding
    
        private final int padding=100;
    
        private final int margin=100;//制作原图留的外边距
    
        private int nowSize;//虚构方框大小
    
        private final int minSize,maxSize;//虚构方框大小边界，规范nowSize
    
        private JPanel toolPane;
    
        private int orgx,orgy,endx,endy;
    
        private int lux=0,luy=0;//虚构方框左上角
    
        public CutHeadImage(Image i){ 
    
            setLayout(null);
    
            setUndecorated(true);
    
            setDefaultCloseOperation(javax.swing.WindowConstants.HIDE_ON_CLOSE);
    
            setBackground(new java.awt.Color(255, 102, 51));
    
            setCursor(new java.awt.Cursor(java.awt.Cursor.HAND_CURSOR));
    
            setResizable(false);
    
            setTitle("调整图片");
    
            toolPane=new JPanel();
    
            toolPane.setBackground(Color.gray);
    
            toolPane.setLayout(new FlowLayout());
    
            JButton yesButton=new JButton("确定");
    
            yesButton.addMouseListener(new java.awt.event.MouseAdapter() { 
    
            });
    
            JButton cancleButton=new JButton("取消");
    
            cancleButton.addMouseListener(new java.awt.event.MouseAdapter(){ 
    
                @Override
    
                public void mouseClicked(MouseEvent evt){ 
    
                    dispose();
    
                }
    
            });
    
            toolPane.add(yesButton);
    
            toolPane.add(cancleButton);
    
            this.add(toolPane);
    
            toolPane.setBounds(0,lenght,lenght, 100);
    
            setSize(lenght, lenght+100);
    
            int x = (Toolkit.getDefaultToolkit().getScreenSize().width - this.getSize().width)/2;
    
            int y = (Toolkit.getDefaultToolkit().getScreenSize().height - this.getSize().height)/2;
    
            setLocation(x, y);
    
            this.setVisible(true);
    
    
    
            int smaller=Math.min(i.getWidth(null), i.getHeight(null));
    
            double N=(lenght-2.0*padding)/smaller;
    
            int width=(int)(i.getWidth(null)*N);
    
            int height=(int)(i.getHeight(null)*N);
    
            BufferedImage temp=new BufferedImage(2*margin+width, 2*margin+height,  BufferedImage.TYPE_INT_BGR);
    
            Graphics2D bGr = temp.createGraphics();
    
            bGr.setColor(Color.white);
    
            bGr.fillRect(0, 0, 2*margin+width,2*margin+width);
    
            bGr.drawImage(i, margin, margin, width, height, null);
    
            bGr.dispose();
    
            image=temp;
    
            nowSize=Math.min(image.getWidth(), image.getHeight());
    
            maxSize=nowSize;
    
            minSize=maxSize-200;
    
            addMouseWheelListener(new MouseWheelListener() { 
    
                public void mouseWheelMoved(MouseWheelEvent evt) { 
    
                    int n=evt.getWheelRotation();
    
                    if(nowSize==minSize&&n<0)
    
                        return ;
    
                    else if(nowSize==maxSize&&n>0)
    
                        return ;
    
                    nowSize+=n*10;
    
                    lux+=n*5;
    
                    luy+=n*5;
    
                    if(nowSize>=maxSize)
    
                        nowSize=maxSize;
    
                    else if(nowSize<=minSize)
    
                        nowSize=minSize;
    
                    if(lux<=0)
    
                        lux=0;
    
                    else if(lux+nowSize>=image.getWidth())
    
                        lux=image.getWidth()-nowSize;
    
                    if(luy<=0)
    
                        luy=0;
    
                    else if(luy+nowSize>=image.getHeight())
    
                        luy=image.getHeight()-nowSize;
    
    
    
                    make();
    
                }
    
            });
    
            addMouseListener(new MouseAdapter(){ 
    
                @Override
    
                public void mousePressed(MouseEvent e) { 
    
                    orgx=e.getX();
    
                    orgy=e.getY();
    
                }
    
            });
    
            addMouseMotionListener(new MouseMotionAdapter(){ 
    
                @Override
    
                public void mouseDragged(MouseEvent e){ 
    
                    endx=e.getX();
    
                    endy=e.getY();
    
                    lux=lux-(endx-orgx);
    
                    luy=luy-(endy-orgy);
    
                    if(lux<=0)
    
                        lux=0;
    
                    else if(lux+nowSize>=image.getWidth())
    
                        lux=image.getWidth()-nowSize;
    
                    if(luy<=0)
    
                        luy=0;
    
                    else if(luy+nowSize>=image.getHeight())
    
                        luy=image.getHeight()-nowSize;
    
    
    
                    make();
    
                }
    
            });
    
        }
    
        protected void make(){ 
    
            BufferedImage temp=new BufferedImage(lenght, lenght ,BufferedImage.TYPE_INT_BGR);
    
            temp.createGraphics().drawImage(image.getSubimage(lux, luy, nowSize, nowSize), 0, 0, lenght,lenght,null);//切割后放大或缩小
    
            tempImage1=temp;
    
            RescaleOp ro = new RescaleOp(0.8f, 0, null); 
    
            tempImage2 = ro.filter(tempImage1, null);
    
            Image tempImage3=createImage(lenght,lenght);//margin+lenght+margin,margin为空
    
            Graphics g=tempImage3.getGraphics();
    
            g.drawImage(tempImage2, 0, 0, lenght,lenght,null);
    
            g.setColor(Color.green);
    
            g.drawRect(padding-1, padding-1, lenght-2*padding+1, lenght-2*padding+1);
    
            saveImage=tempImage1.getSubimage(padding, padding, lenght-2*padding, lenght-2*padding);
    
            g.drawImage(saveImage, padding, padding, null);
    
            CutHeadImage.this.getGraphics().drawImage( tempImage3, 0, 0, null);
    
        }
    
        @Override
    
        public void paint(Graphics g){ 
    
            super.paint(g);
    
            BufferedImage temp=new BufferedImage(lenght, lenght ,BufferedImage.TYPE_INT_BGR);
    
            temp.createGraphics().drawImage(image.getSubimage(lux, luy, nowSize, nowSize), 0, 0, lenght,lenght,null);  ;
    
            tempImage1=temp;
    
            RescaleOp ro = new RescaleOp(0.8f, 0, null); 
    
            tempImage2 = ro.filter(tempImage1, null); 
    
            g.drawImage(tempImage2, 0, 0, lenght, lenght, null);
    
            g.setColor(Color.green);
    
            g.drawRect(padding-1, padding-1, lenght-2*padding+1, lenght-2*padding+1);//99,99,501,501
    
            saveImage=tempImage1.getSubimage(padding, padding, lenght-2*padding, lenght-2*padding);
    
            g.drawImage(saveImage, padding, padding, null);
    
        }
    
        public static void main(String args[]){ 
    
            new CutHeadImage(new ImageIcon("C:\\Users\\心里的潇洒情\\Desktop\\新建文件夹\\0c3c28bfd9fbe87b952ce334fd430ae.jpg").getImage());
    
        }
    
    }