Java制作简单小画板

Java制作简单画板，包括两个类，一个主要画板类Drawpad，一个画板监听器DrawListener类。
1、Drawpad类，包括画板，画板功能设计，保存图片等

package Java课程设计;import java.awt.Graphics;import javax.imageio.ImageIO;
import javax.print.DocFlavor.STRING;
import javax.swing.ImageIcon;
import javax.swing.JDialog;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;import java.awt.AWTException;
import java.awt.BasicStroke;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.Rectangle;
import java.awt.Robot;
import java.awt.Shape;
import java.awt.Window;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.image.BufferedImage;
import java.awt.image.ColorModel;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.ArrayList;import javax.swing.JButton;
import javax.swing.filechooser.FileNameExtensionFilter;
public class Drawpad {static Color color1;
public static void main(String[] args) {Drawpad dp = new Drawpad();dp.initUI();}  //创建一个JFrame图形窗口public void initUI() {JFrame jf = new JFrame();jf.setTitle("创意画图板(勿拖动)");jf.setSize(1500,1000);jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);//关闭时退出jf.setLocationRelativeTo(null);//居中，不用定位窗口大小//创建字体，之后所有的字体为该字体Font f=new Font("方正仿宋简体", Font.BOLD, 20);//创建画笔监听器DrawListener  dl = new DrawListener();//创建读取图片BufferedImage(将图片加载到drawPanel面板中)和画笔g，画笔g为在保存图片上进行图画。BufferedImage bi = new BufferedImage(1300,800, BufferedImage.TYPE_INT_ARGB);Graphics2D g = bi.createGraphics();//初始化时填充白色g.setColor(Color.WHITE);//先将图片填充为白色g.fillRect(0, 0, 1300,800);//设置增加菜单栏，包括保存和新建两个按钮JMenuBar box=new JMenuBar();//在窗体上加菜单条,做一个菜单条,是菜单条，不是工具栏//创建menubtn1保存按钮，并加上监听器，以图片的形式保存绘画板上的内容JButton menubtn1=new JButton("保存");//为保存按钮注册监听器menubtn1.addActionListener(new ActionListener(){@Overridepublic void actionPerformed(ActionEvent arg0) {//创建文件保存窗口JFileChooser f=new JFileChooser("保存");int returnVal = f.showSaveDialog(null);File  file1=null;if(returnVal == JFileChooser.APPROVE_OPTION) {file1 =f.getSelectedFile();String name = f.getName(file1);try {ImageIO.write(bi, "PNG", new File(f.getCurrentDirectory(),name+".png"));} catch (IOException e) {//需抛出异常// TODO Auto-generated catch blocke.printStackTrace();}}}});/*JButton menubtn2=new JButton("打开");//为打开按钮注册监听器menubtn1.addActionListener(new ActionListener(){@Override//获取当前画笔粗细public void actionPerformed(ActionEvent arg0) {BufferedImage bimg = null;JFileChooser f=new JFileChooser("打开");int returnVal = f.showOpenDialog(null);File   file1=null;if(returnVal == JFileChooser.APPROVE_OPTION) {file1 =f.getSelectedFile();String name = f.getName(file1);try {} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}});*///创建menubtn3退出按钮，并加上监听器，退出程序JButton menubtn3=new JButton("退出");menubtn3.addActionListener(new ActionListener(){@Override//获取当前画笔粗细public void actionPerformed(ActionEvent arg0) {int ret=JOptionPane.showConfirmDialog(null, "你确定要退出吗", "确认退出", JOptionPane.YES_NO_OPTION);if(ret==JOptionPane.YES_OPTION){//“确认”退出程序System.exit(0);}}});box.add(menubtn1);// box.add(menubtn2);box.add(menubtn3);//jf.setJMenuBar(box);jf.setJMenuBar(box);//jf用BorderLayout布局//北边,画板模式功能栏JPanel funcPanel=new JPanel();jf.add(funcPanel,BorderLayout.NORTH);//中间,画布JPanel drawPanel=new JPanel();jf.add(drawPanel,BorderLayout.CENTER);drawPanel.setPreferredSize(new Dimension(1000,700));drawPanel.setBackground(dl.background);//一定要在画布上加上监听器!!1若画布没有加上监听器，无法显示drawPanel.addMouseListener(dl);drawPanel.addMouseMotionListener(dl);//南边,为画笔颜色选择按钮JPanel colorPanel=new JPanel();jf.add(colorPanel,BorderLayout.SOUTH);//右边,为选择背景颜色按钮、画笔粗细选择按钮JPanel backgroundPanel=new JPanel();jf.add(backgroundPanel,BorderLayout.EAST);backgroundPanel.setPreferredSize(new Dimension(150,1000));//左边,获取当前状态如:背景颜色、画笔颜色、画笔性质JPanel nowPanel=new JPanel();jf.add(nowPanel,BorderLayout.WEST);nowPanel.setPreferredSize(new Dimension(180,1000));//左边放入当前状态PanelnowPanel.setBackground(Color.WHITE);JLabel label2=new JLabel("当前背景颜色");label2.setFont(f);nowPanel.add(label2);//放入当前背景颜色JButton nowbackgroundColor=new JButton();nowbackgroundColor.setPreferredSize(new Dimension(60,60));nowbackgroundColor.setBackground(Color.WHITE);//背景初始化为灰色nowPanel.add(nowbackgroundColor);//放入当前画笔JLabel label3=new JLabel("请选择画笔模式");label3.setFont(f);nowPanel.add(label3);//放入当前画笔颜色JButton nowColor=new JButton();nowColor.setPreferredSize(new Dimension(60,60));nowColor.setBackground(Color.BLACK);//画笔颜色初始化为黑色色nowPanel.add(nowColor);//获取当前画笔模式JLabel label4=new JLabel("当前画笔模式");label4.setFont(f);nowPanel.add(label4);JTextField text=new JTextField(dl.btncontent); //获得选择画笔模式的按钮内容，得到当前画笔模式text.setPreferredSize(new Dimension (160,60));text.setFont(f);text.setEditable(false);  //不可改nowPanel.add(text);//获取当前画笔粗细状态JLabel label6=new JLabel("当前画笔粗细(中)");  //默认粗细为中label6.setFont(f);nowPanel.add(label6);JTextField text1=new JTextField("请选择画笔粗细");text1.setPreferredSize(new Dimension (160,60));text1.setFont(f);text1.setEditable(false); //不可编辑nowPanel.add(text1);//输入需要添加的文字JLabel label7=new JLabel("请输入文字:");label7.setFont(f);nowPanel.add(label7);JTextField text2=new JTextField();text2.setPreferredSize(new Dimension (160,60));text2.setFont(f);nowPanel.add(text2); JLabel label8=new JLabel("请输入文字样式:");label8.setFont(f);nowPanel.add(label8);JTextField text3=new JTextField("方正仿宋简体");text3.setPreferredSize(new Dimension (160,60));text3.setFont(f);nowPanel.add(text3);JLabel label9=new JLabel("请输入文字大小:");label9.setFont(f);nowPanel.add(label9);JTextField text4=new JTextField("20");text4.setPreferredSize(new Dimension (160,60));text4.setFont(f);nowPanel.add(text4);//为获取文字内容加一个按钮并加上监听器JButton getcontent=new JButton("获取文字");getcontent .setFont(f);getcontent.setBackground(Color.YELLOW);getcontent.addActionListener(new ActionListener(){@Overridepublic void actionPerformed(ActionEvent e) {String content=text2.getText();String mode=text3.getText();String size=text4.getText();dl.mode=mode; //获取文字样式dl.content=content; //获取文字内容dl.size=size; //获取文字大小}});nowPanel.add(getcontent);//最后在当前状态画板中加一个清除画布内容的功能JButton clear=new JButton("清除");clear.setFont(f);clear.setBackground(Color.RED);clear.addActionListener(dl);nowPanel.add(clear);//添加按钮到北边（每个按钮写两行代码太多，通过数组方式添加按钮）//加入标签（选择画笔模式）JLabel labelh =new JLabel("选择画笔模式");labelh.setFont(f);funcPanel.add(labelh);//将按钮名字保存在数组中，后依次存储String[] btnstr= {"画笔","直线","矩形","填充矩形","圆","填充圆","弧线","喷枪","波形","分形","长方体","九宫格递归","文字","橡皮"};//将画笔状态按钮防置panel中for( int i=0;i<btnstr.length;i++) {JButton btn=new JButton(btnstr[i]);funcPanel.add(btn);btn .setFont(f);btn.setBackground(Color.white);//加上画笔监听器btn.addActionListener(dl);//加上监听器：获取当前 画笔模式btn.addActionListener(new ActionListener(){@Overridepublic void actionPerformed(ActionEvent e) {text.setText(btn.getText()); //在当前模式加入选取的画笔模式}});};//在BrderLayout布局SOUTH添加选择颜色按钮JLabel label =new JLabel("选择画笔(橡皮)颜色");label.setFont(f);colorPanel.add(label);//添加颜色按钮Color[] colorArray = { Color.BLUE, Color.GREEN, Color.RED, Color.BLACK,Color.ORANGE,Color.PINK,Color.CYAN,Color.MAGENTA,Color.DARK_GRAY,Color.GRAY,Color.LIGHT_GRAY,Color.YELLOW,Color.WHITE};//在布局管理器中添加颜色按钮for( int i=0;i<colorArray.length;i++) {JButton button = new JButton();button.setBackground(colorArray[i]);button.setPreferredSize(new Dimension(50, 50));button.addActionListener(dl);colorPanel.add(button);//获取当前状态的画笔颜色button.addActionListener(new ActionListener(){@Overridepublic void actionPerformed(ActionEvent e) {nowColor.setBackground(button.getBackground());  //在当前画笔颜色按钮加入选择的按钮颜色}});};funcPanel.setBackground(Color.gray);//添加背景主板颜色按钮，并设置监听器（背景颜色为按钮颜色）JLabel label1=new JLabel("选择背景颜色");label1.setFont(f);backgroundPanel.add(label1);Color[] backgroundArray= { Color.GREEN, Color.RED,Color.ORANGE,Color.PINK,Color.CYAN,Color.MAGENTA,Color.DARK_GRAY,Color.GRAY,Color.LIGHT_GRAY,Color.YELLOW,Color.WHITE,Color.BLACK};//将按钮加入进去for( int i=0;i<backgroundArray.length;i++) {JButton button = new JButton();button.setBackground(backgroundArray[i]);button.setPreferredSize(new Dimension(50, 50));backgroundPanel.add(button);//添加监听器，按下按钮改变背景颜色，同时体现当前状态button.addActionListener(new ActionListener(){@Overridepublic void actionPerformed(ActionEvent arg0) {drawPanel.setBackground(button.getBackground()); //将背景颜色改为选取的背景颜色color1=button.getBackground();dl.background=color1;  //将背景颜色传给DrawListener中的变量System.out.println(color1);g.setColor(color1);g.fillRect(0, 0, 1300,800);  //图片画笔填充背景颜色nowbackgroundColor.setBackground(button.getBackground());}});};//添加选择画笔粗细的按钮,可选择画笔的粗细JLabel label5=new JLabel("选择画笔粗细");label5.setFont(f);backgroundPanel.add(label5);String[] Size={"细","中","粗"};//选择画笔模式的按钮for(int i=0;i<3;i++){JButton graphsize=new JButton(Size[i]);graphsize.setFont(new Font("宋体", Font.BOLD, 15));graphsize.setBackground(Color.WHITE);graphsize.setPreferredSize(new Dimension(50, 50));backgroundPanel.add(graphsize);graphsize.addActionListener(dl);graphsize.addActionListener(new ActionListener(){@Override//获取当前画笔粗细public void actionPerformed(ActionEvent e) {text1.setText(graphsize.getText()); //获取当前画笔模式}});}jf.setVisible(true);// 获取这个界面的ｇｒａｐｈｉｃｓ属性, 画笔 g//Graphics2D g = (Graphics2D) drawPanel.getGraphics();//drawPanel.paintComponent(g);Graphics2D g1= (Graphics2D) drawPanel.getGraphics();//为画笔添加监听器drawPanel.addMouseListener(dl);dl.g =  g1;// 右传左 dl.g3 = g;// 右传左}
}

2、DrawListner类，画板功能监听器

package Java课程设计;import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.Shape;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseMotionListener;
import java.awt.geom.AffineTransform;import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;import java.awt.Color;
import java.util.ArrayList;
import java.util.Random;import Java课程设计.Drawpad;
public class DrawListener implements MouseListener,ActionListener,MouseMotionListener {//获取画笔Graphics2D g;//获取在保存图片上的画笔Graphics2D g3;//获取按钮内容String btnstr;Color background=Color.white; //背景颜色默认为白色Color graphcolor=Color.BLACK; //画笔颜色默认为黑色JButton btn;int x1, y1, x2, y2;// 声明坐标变量 int x3=400;int y3=0;int graphsize=3;//默认为中等画笔String btncontent="画笔"; //默认画笔模式为画笔String content;  //获取文字中的文字内容String mode="方正仿宋简体";  //文字样式默认为“方正仿宋简体”String size="20";//九宫格递归方法,画出九宫格public void dg(int x,int y,int width,int height) {//九宫格函数，九宫格的实现if(width<3) {return;}if(width>90) {g.fillRect(x+width/3, y+height/3, width/3, height/3);g3.fillRect(x+width/3, y+height/3, width/3, height/3);dg(x, y, width/3, height/3);dg(x+width/3, y, width/3, height/3);dg(x+(width/3)*2, y, width/3, height/3);dg(x, y+height/3, width/3, height/3);dg(x, y+(height/3)*2, width/3, height/3);dg(x+width/3, y+height/3, width/3, height/3);dg(x+width/3, y+(height/3)*2, width/3, height/3);dg(x+(width/3)*2, y+height/3, width/3, height/3);dg(x+(width/3)*2, y+(height/3)*2, width/3, height/3);}//九宫格的实现else {g.drawOval(x+width/3, y+height/3, width/3, height/3);g3.drawOval(x+width/3, y+height/3, width/3, height/3);dg(x, y, width/3, height/3);dg(x+width/3, y, width/3, height/3);dg(x+(width/3)*2, y, width/3, height/3);dg(x, y+height/3, width/3, height/3);dg(x, y+(height/3)*2, width/3, height/3);dg(x+width/3, y+height/3, width/3, height/3);dg(x+width/3, y+(height/3)*2, width/3, height/3);dg(x+(width/3)*2, y+height/3, width/3, height/3);dg(x+(width/3)*2, y+(height/3)*2, width/3, height/3);} }//判断是颜色按钮还是画笔按钮,改变的全部是画笔按钮public void actionPerformed(ActionEvent e) {btnstr=e.getActionCommand();  //获取按钮的文字内容//g.setColor(Color.black);//如果为颜色按钮，将画笔改颜色if(btnstr.equals("清除")){//重新填充背景，同时将画笔置为背景颜色System.out.println(background);g.setColor(background);//保存图片画笔填充背景颜色g.fillRect(0, 0, 1300, 800);g3.setColor(background);//画笔重新填充背景g3.fillRect(0, 0, 1300, 800);g.setColor(graphcolor);g3.setColor(graphcolor);}else{if(btnstr.equals("")) {//获取点击内容,将其内容强制转换成JButtonbtn=(JButton) e.getSource();//获取颜色按钮颜色graphcolor=btn.getBackground();}//若为画笔粗细，获取粗细大小else if(btnstr.equals("细")){graphsize=1;  //画笔大小为细，大小size为1}else if(btnstr.equals("中")){graphsize=3;}else if(btnstr.equals("粗")){graphsize=5;}else{btncontent=btnstr; //获取画笔模式按钮的内容}}}//鼠标点击方法@Overridepublic void mouseClicked(MouseEvent e) {System.out.println("点击");}//鼠标按下方法@Overridepublic void mousePressed(MouseEvent e) {System.out.println("按下");x1=e.getX();y1 =e.getY();}//重写鼠标释放时的方法@Overridepublic void mouseReleased(MouseEvent e) {g.setColor(graphcolor);//获取保存画笔的颜色g3.setColor(graphcolor); //获取画板画笔的颜色x2=e.getX();y2 =e.getY();//选取画笔模式为直线时if(btncontent.equals("直线")) {g.setStroke(new BasicStroke(graphsize)); //保存画笔进行画图g.drawLine(x1, y1, x2, y2);//画笔画直线g3.setStroke(new BasicStroke(graphsize));//置画笔大小g3.drawLine(x1, y1, x2, y2);}//选取画笔模式为波形时else if(btncontent.equals("波形")) {//波形函数g.setStroke(new BasicStroke(graphsize)); //置画笔大小g3.setStroke(new BasicStroke(graphsize));double x4 = 0,y4 = 0;double a2=1.40,b2=1.56,c2=1.40,d2=-6.56;//波形函数for(int i=0;i<5000;i++) {double x5=Math.sin(a2*x4)-Math.cos(b2*y4);double y5=Math.sin(c2*x4)-Math.cos(d2*y4);x4=x5;y4=y5;int px=(int)(x5*100+x1);int py=(int)(y5*100+y1);//画波形g.drawLine(px, py, px, py);g3.drawLine(px, py, px, py);}}//选取画笔模式为矩形时else if(btncontent.equals("矩形")) {g.setStroke(new BasicStroke(graphsize)); //获取矩形画笔的大小g.drawRect(Math.min(x1, x2), Math.min(y1, y2), Math.abs(x2-x1), Math.abs(y2-y1));//画矩形g3.setStroke(new BasicStroke(graphsize)); g3.drawRect(Math.min(x1, x2), Math.min(y1, y2), Math.abs(x2-x1), Math.abs(y2-y1));}//选取的画笔模式为填充矩形else if(btncontent.equals("填充矩形")){//画填充矩形g.fillRect(Math.min(x1, x2), Math.min(y1, y2), Math.abs(x2-x1), Math.abs(y2-y1));g3.fillRect(Math.min(x1, x2), Math.min(y1, y2), Math.abs(x2-x1), Math.abs(y2-y1));}//长方体函数else if(btncontent.equals("长方体")){g.setStroke(new BasicStroke(graphsize));//获取长方体画笔大小g.setColor(btn.getBackground());//将画笔颜色置选择画笔颜色按钮颜色//长方体函数g.fillRect(Math.min(x1,x2),Math.min(y1,y2),Math.abs(x1-x2),Math.abs(y1-y2));g3.setStroke(new BasicStroke(graphsize));g3.setColor(btn.getBackground());g3.fillRect(Math.min(x1,x2),Math.min(y1,y2),Math.abs(x1-x2),Math.abs(y1-y2));int a,b,c,d;a=Math.min(x1, x2);b=Math.max(x1, x2);c=Math.min(y1, y2);d=Math.max(y1, y2);int m=(int)((b-a)*Math.cos(Math.PI/4)*Math.sin(Math.PI/4));int n=(int)((b-a)*Math.cos(Math.PI/4)*Math.sin(Math.PI/4));//顶面g.setColor(btn.getBackground());g.fillPolygon(new int[] {a, a+m, b+m,b},new int[] {c,c-n,c-n,c},4);//右侧面g.setColor(btn.getBackground());g.fillPolygon(new int[] {b, b, b+m,b+m},new int[] {c,d,d-n,c-n},4);g3.setColor(btn.getBackground());g3.fillPolygon(new int[] {a, a+m, b+m,b},new int[] {c,c-n,c-n,c},4);//右侧面g3.setColor(btn.getBackground());g3.fillPolygon(new int[] {b, b, b+m,b+m},new int[] {c,d,d-n,c-n},4);}//分形函数else if(btncontent.equals("分形")){g.setStroke(new BasicStroke(graphsize));  //获取画笔大小g3.setStroke(new BasicStroke(graphsize));double x = 0,y = 0;//分形函数实现double a1=-1.8,b=-2.0,c=-0.5,d=-0.9;for(int i=0;i<5000;i++) {double x3=Math.sin(a1*y)-c*Math.cos(a1*x);double y3=Math.sin(b*x)-d*Math.cos(b*y);x=x3;y=y3;int px=(int)(x3*100+x1);int py=(int)(y3*100+y1);g.drawLine(px, py, px, py);g3.drawLine(px, py, px, py);}}//画圆else if(btncontent.equals("圆")) {g.setStroke(new BasicStroke(graphsize));//获取画笔大小g.drawOval(Math.min(x1, x2), Math.min(y1, y2), Math.abs(x2-x1), Math.abs(y2-y1));//画圆g3.setStroke(new BasicStroke(graphsize));g3.drawOval(Math.min(x1, x2), Math.min(y1, y2), Math.abs(x2-x1), Math.abs(y2-y1));}//画填充圆else if(btncontent.equals("填充圆")){g.fillOval(Math.min(x1, x2), Math.min(y1, y2), Math.abs(x2-x1), Math.abs(y2-y1));//画填充圆g3.fillOval(Math.min(x1, x2), Math.min(y1, y2), Math.abs(x2-x1), Math.abs(y2-y1));}//当选取模式为文字else if(btncontent.equals("文字")){//获取画笔大小g.setStroke(new BasicStroke(15));Font font = new Font(mode, Font.BOLD, Integer.parseInt(size)); //获得文字内容，文字大小，文字样式    g.setFont(font); //在画笔中置文字样式和大小g.drawString(content, x1, y1); //写上文字内容g3.setStroke(new BasicStroke(15));g3.setFont(font);//放入文字样式和大小g3.drawString(content, x1, y1);}//当画笔模式为弧线时else if(btncontent.equals("弧线")){g.setStroke(new BasicStroke(graphsize));//获取画笔大小//弧线函数g.drawArc(x1, y1, 100, 60, 0, 180);g3.setStroke(new BasicStroke(graphsize));g3.drawArc(x1, y1, 100, 60, 0, 180);}//九宫格递归，调用九宫格函数else if(btncontent.equals("九宫格递归")) {//九宫格递归实现dg(0,50,600,600);}System.out.println("释放");}@Override//鼠标进入方法public void mouseEntered(MouseEvent e) {System.out.println("进入");}@Override//鼠标离开界面方法public void mouseExited(MouseEvent e) {System.out.println("离开");}@Overridepublic void mouseMoved(MouseEvent e) {}//重写鼠标移动函数@Overridepublic void mouseDragged(MouseEvent e) {g.setColor(graphcolor); //获取画笔颜色g3.setColor(graphcolor);// TODO Auto-generated method stubx2=e.getX();y2 =e.getY();//当为画笔时if(btncontent.equals("画笔")){g.setStroke(new BasicStroke(graphsize));   //获取当前画笔大小      //画笔实现g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);g.drawLine(x1, y1, x2, y2);g3.setStroke(new BasicStroke(graphsize));           g3.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);g3.drawLine(x1, y1, x2, y2);x1 = x2;y1 = y2;}//橡皮擦if(btncontent.equals("橡皮")){//将画笔颜色置为背景颜色g.setColor(background);g3.setColor(background);g.setStroke(new BasicStroke(30)); //将橡皮擦的大小置大小为30                     g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);g.drawLine(x1, y1, x2, y2);g3.setStroke(new BasicStroke(30));                            g3.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);g3.drawLine(x1, y1, x2, y2);x1 = x2;y1 = y2;   //使用过后，将画笔颜色重新置为原来颜色g.setColor(graphcolor);g3.setColor(graphcolor);}//喷枪函数else if(btncontent.equals("喷枪")){g.setStroke(new BasicStroke(graphsize));     //不用加粗，获取画笔大小                      g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);g3.setStroke(new BasicStroke(graphsize));      //不用加粗                        g3.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);//喷枪实现函数for(int k=0;k<20;k++){Random i=new Random();       int a=i.nextInt(10);int b=i.nextInt(20);g.drawLine(x2+a, y2+b, x2+a, y2+b);g3.drawLine(x2+a, y2+b, x2+a, y2+b);}}}}

画板演示:

保存图片

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