java---头像剪切功能

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。

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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());

}