实现了简单的电脑画图软件,代码如下:

import java.awt.BasicStroke;

import java.awt.BorderLayout;
import java.awt.CardLayout;
import java.awt.Color;
import java.awt.Cursor;
import java.awt.Dialog;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.Font;
import java.awt.Frame;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.GridLayout;
import java.awt.Label;
import java.awt.TextField;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionAdapter;
import java.awt.event.MouseMotionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.io.Serializable;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Random;

import javax.swing.*;

public class MYPAINT extends JFrame
{
private int flag = 1;            //功能端
private JButton bpan = new JButton(" 画笔   ");
private JButton bxpc = new JButton("橡皮擦");
private JButton bwbk = new JButton("文本框");
private JButton bqk = new JButton("清空");
private JButton bpq = new JButton("喷漆");
private JButton bb = new JButton("B");
private JButton bzfx = new JButton("矩形");
private JButton bsjx = new JButton("三角形");
private JButton byx = new JButton("圆形");
private JButton bty = new JButton("椭圆");
private JButton byjjx = new JButton("圆角矩形");
private JButton bzx = new JButton("直线");
private JRadioButton issx = new JRadioButton("是否实心");
private JLabel lnowc = new JLabel("当前\n颜色: ");
private JButton bhong = new JButton();
private JButton bhuang = new JButton();
private JButton bcolor = new JButton();
private JButton blan = new JButton();
private JButton blv = new JButton();
private JButton bmore = new JButton("更多");
private JLabel lzt = new JLabel("字体:");
    private String str[] = {
            "宋体", "隶书", "华文彩云", "仿宋_GB2312", "华文行楷","方正舒体"
        };
    private String nzt = new String(" 宋体 ");
private JComboBox czt = new JComboBox(str);
private JLabel lcx = new JLabel("粗细:");
private TextField tcx = new TextField("5",10);
private JCheckBox rb = new JCheckBox("粗体");
private JCheckBox ri = new JCheckBox("斜体");
private int isb ;
private int isi ;
private TextField stata = new TextField(30);   //创建文本框对象,长度为30个字符
private JPanel tool = new JPanel();
private MyCanvas pmain = new MyCanvas();
private JPanel p1 = new JPanel();//工具
private JPanel p2 = new JPanel();//形状
private JPanel p3 = new JPanel();//颜色
private JPanel p4 = new JPanel();//文本
private Label p5 = new Label();//
private PAN a = new PAN();
private int MAX = 0;
private int R=0, G=00, B=0; 
private shap[] csave = new shap[10000];
public MYPAINT()
{
setLocation(600,600);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setSize(1080, 960);
setLocationRelativeTo(null);
setVisible(true);
//this.setResizable(false);

GridBagLayout gridbag = new GridBagLayout();
tool.setLayout(gridbag);
tool.add(p1);tool.add(p2);tool.add(p3);tool.add(p4);tool.add(p5);
GridBagConstraints gbc = new GridBagConstraints();
gbc.fill = GridBagConstraints.BOTH;

gbc.gridwidth=1;//该方法是设置组件水平所占用的格子数,如果为0,就说明该组件是该行的最后一个
   gbc.weightx = 0;//该方法设置组件水平的拉伸幅度,如果为0就说明不拉伸,不为0就随着窗口增大进行拉伸,0到1之间
   gbc.weighty=0;//该方法设置组件垂直的拉伸幅度,如果为0就说明不拉伸,不为0就随着窗口增大进行拉伸,0到1之间
   gridbag.setConstraints(p1, gbc);//设置组件
   p1.setLayout(new GridLayout(3,2));
   JPanel tp11 = new JPanel();JPanel tp22 = new JPanel();JPanel tp33 = new JPanel();JPanel tp44 = new JPanel();JPanel tp55 = new JPanel();JPanel tp66 = new JPanel();
   p1.setBorder(BorderFactory.createTitledBorder("工具")); 
   tp11.add(bpan);tp22.add(bxpc);tp33.add(bwbk);tp44.add(bqk);tp55.add(bpq);tp66.add(bb);
   p1.add(tp11);p1.add(tp22);p1.add(tp33);p1.add(tp44);p1.add(tp55);p1.add(tp66);
   
   gbc.gridwidth=1;
   gbc.weightx = 0;
        gbc.weighty=0;
        gridbag.setConstraints(p2,gbc);
        p2.setBorder(BorderFactory.createTitledBorder("形状")); 
        p2.setLayout(new GridLayout(3,4));
        JPanel tp20= new JPanel(); JPanel tp21= new JPanel();
        p2.add(bzfx);p2.add(bsjx);p2.add(byx);p2.add(bty);p2.add(byjjx);p2.add(bzx);p2.add(tp20);p2.add(tp21);p2.add(issx);
        
        
        gbc.gridwidth=1;
        gbc.weightx = 0;
        gbc.weighty=0;
        gridbag.setConstraints(p3,gbc);
        p3.setBorder(BorderFactory.createTitledBorder("颜色")); 
        p3.setLayout(new GridLayout(3,2));
        JPanel pbcolor = new JPanel();pbcolor.add(bcolor);
        p3.add(lnowc);p3.add(bhong);p3.add(bhuang);p3.add(pbcolor);;p3.add(blan);p3.add(blv);p3.add(new Label());p3.add(new Label());p3.add(bmore);
        bcolor.setBackground(new Color(R,G,B));;bhong.setBackground(Color.RED); bhuang.setBackground(Color.yellow);
        blan.setBackground(Color.BLUE);blv.setBackground(Color.GREEN);

gbc.gridwidth=1;
        gbc.weightx = 0;
        gbc.weighty=0;
        gridbag.setConstraints(p4,gbc);
        p4.setBorder(BorderFactory.createTitledBorder("文本")); 
        JPanel tp0 = new JPanel();
        czt.setPreferredSize(new Dimension(100,20));
        tp0.add(lzt);tp0.add(czt);
        JPanel tp1 = new JPanel();
        czt.addItemListener(
                new ItemListener() {
                    public void itemStateChanged(ItemEvent e) {
                        nzt = str[czt.getSelectedIndex()];
                        System.out.println(nzt);
                    }
                });
        tcx.addKeyListener(new KeyAdapter(){  
            public void keyTyped(KeyEvent e) {  
                int keyChar = e.getKeyChar();                 
                if(keyChar >= KeyEvent.VK_0 && keyChar <= KeyEvent.VK_9){                
                }else{  
                    e.consume(); //屏蔽掉非法输入  
                }  
            }  
        });  
        JPanel tp2 = new JPanel();tp2.add(ri);tp2.add(rb);
        checkBox han = new checkBox();
        ri.addItemListener(han);rb.addItemListener(han);
        tp1.add(lcx);tp1.add(tcx);
        p4.setLayout(new GridLayout(3,1));
        p4.add(tp1);        p4.add(tp0);p4.add(tp2);
        
        
        
        gbc.gridwidth=0;//该方法是设置组件水平所占用的格子数,如果为0,就说明该组件是该行的最后一个
        gbc.weightx = 1;//不能为1,j4是占了4个格,并且可以横向拉伸,
        gbc.weighty=0;
        gridbag.setConstraints(p5,gbc);
        
        /**TOOL结束,画板开始***/   
  
        pmain.setBorder(BorderFactory.createTitledBorder("画板")); 
        pmain.setBackground(Color.WHITE);
        
        dosave();
        
        bpan.addActionListener(new ActionListener() {//画笔
        @Override
        public void actionPerformed(ActionEvent e) {flag = 1;}});
        bpq.addActionListener(new ActionListener() {//喷漆
        @Override
        public void actionPerformed(ActionEvent e) {flag = 15;}});
        bxpc.addActionListener(new ActionListener() {//橡皮擦
@Override
public void actionPerformed(ActionEvent e) {flag = 2;}});
        bwbk.addActionListener(new ActionListener() {//文本框
@Override
public void actionPerformed(ActionEvent e) {flag = 3;}});
        bqk.addActionListener(new ActionListener() {//清空
@Override
public void actionPerformed(ActionEvent e) {MAX=0;repaint();}});
        bzfx.addActionListener(new ActionListener() {//矩形
@Override
public void actionPerformed(ActionEvent e) {
if(issx.isSelected())
flag = 5;
else
flag = 4;
}});
        bsjx.addActionListener(new ActionListener() {//三角形
@Override
public void actionPerformed(ActionEvent e) {
if(issx.isSelected())
flag = 7;
else
flag = 6;}});
        byx.addActionListener(new ActionListener() {//圆形
@Override
public void actionPerformed(ActionEvent e) {
if(issx.isSelected())
flag = 9;
else
flag = 8;}});
        bty.addActionListener(new ActionListener() {//椭圆
@Override
public void actionPerformed(ActionEvent e) {
if(issx.isSelected())
flag = 11;
else
flag = 10;}});
        byjjx.addActionListener(new ActionListener() {//圆角矩形
@Override
public void actionPerformed(ActionEvent e) {
if(issx.isSelected())
flag = 13;
else
flag = 12;}});
        bzx.addActionListener(new ActionListener() {//直线
@Override
public void actionPerformed(ActionEvent e) {flag = 14;}});
        
        bhong.addActionListener(new ActionListener() {//红
@Override
public void actionPerformed(ActionEvent e) {R = 255;G = 0;B = 0; bcolor.setBackground(new Color(R,G,B));}});
        bhuang.addActionListener(new ActionListener() {//黄
@Override
public void actionPerformed(ActionEvent e) {R = 255;G = 255;B = 0; bcolor.setBackground(new Color(R,G,B));}});
        blan.addActionListener(new ActionListener() {//蓝
@Override
public void actionPerformed(ActionEvent e) {R = 0;G = 0;B = 255; bcolor.setBackground(new Color(R,G,B));}});
        blv.addActionListener(new ActionListener() {//绿
@Override
public void actionPerformed(ActionEvent e) {R = 0;G = 255;B = 0; bcolor.setBackground(new Color(R,G,B));}});
        bmore.addActionListener(new ActionListener(){
        @Override
        public void actionPerformed(ActionEvent e){
        Color color=new Color(200,200,200);  
        color=JColorChooser.showDialog(null,"请选择你喜欢的颜色" ,color);
        R = color.getRed();
        B = color.getBlue();
        G = color.getGreen();
        bcolor.setBackground(new Color(R,G,B));
        }
        });
        bwbk.addActionListener(new ActionListener(){
        @Override
        public void actionPerformed(ActionEvent e){
        flag = 3;
        }
        });
        bb.addActionListener(new ActionListener(){
        @Override
        public void actionPerformed(ActionEvent e){
        if(MAX!=0)
        MAX--;
        repaint();
        }
        });
        
        add(tool,"North");
add(pmain,"Center");
add(stata,"South");
stata.setEditable(false);
}
//画图面板类,用来画图
    class MyCanvas extends JPanel {
        public MyCanvas() {
            setCursor(Cursor.getPredefinedCursor(Cursor.CROSSHAIR_CURSOR));
            setBackground(Color.white);
            addMouseListener(new mousec());
            addMouseMotionListener(new mousec());
            JPanel a = new JPanel();
        }
        @Override
        public void paintComponent(Graphics g0) {
            super.paintComponent(g0);
            Graphics2D g = (Graphics2D) g0;    
            int i = 0; 
            while(i<=MAX)
            {
            //System.out.println("xx"+MAX);
            draw(g,csave[i++]);
            }
        }
        void draw(Graphics2D g, shap s) {
        s.draw(g);//画
        }
    }
    //保存画过的图像
    void dosave()
    {
    switch(flag)
    {
    case 1:csave[MAX] = new PAN(); break;
    case 2:csave[MAX] = new XPC(); break;
    case 3:csave[MAX] = new TEXT(); break;
    case 4:csave[MAX] = new ZFX(); break;
    case 5:csave[MAX] = new SZFX(); break;
    case 6:csave[MAX] = new SJX(); break;
    case 7:csave[MAX] = new SSJX(); break;
    case 8:csave[MAX] = new YX(); break;
    case 9:csave[MAX] = new SYX(); break;
    case 10:csave[MAX] = new TY(); break;
    case 11:csave[MAX] = new STY(); break;
    case 12:csave[MAX] = new YJJX(); break;
    case 13:csave[MAX] = new SYJJX(); break;
    case 14:csave[MAX] = new ZX(); break;
    case 15:csave[MAX] = new PENQI();break;
   
    }
    csave[MAX].B = B;csave[MAX].G = G;csave[MAX].R = R;
    csave[MAX].cx = Integer.valueOf(tcx.getText());
    csave[MAX].zti = nzt;
    csave[MAX].max = Integer.valueOf(tcx.getText())*2;
    csave[MAX].time = Integer.valueOf(tcx.getText())*30;
    Random random = new Random();
    for(int i = 0;i<100;i++)
    {
    csave[MAX].fx[i] = random.nextInt(csave[MAX].max) - csave[MAX].max;
    csave[MAX].fy[i] = random.nextInt(csave[MAX].max) - csave[MAX].max;
    }
    }
    
    class mousec implements MouseMotionListener,MouseListener {
    public void mousePressed(MouseEvent e) {
    MAX++;            
        dosave();
        csave[MAX].x1 = csave[MAX].x2 = e.getX();
       csave[MAX].y1 = csave[MAX].y2 = e.getY();
       System.out.println(e.getX());
        if(flag == 3)
        {
           String input;
                input = JOptionPane.showInputDialog(
                        "");
                csave[MAX].isb = isb;
                csave[MAX].isi = isi;
                csave[MAX].zti = nzt;
                csave[MAX].s = input;
                csave[MAX].m = MAX;
                System.out.println(csave[MAX].x1);
                System.out.println(MAX);
                repaint();
        }

}
        public void mouseReleased(MouseEvent e) {

csave[MAX].x2 = e.getX();
            csave[MAX].y2 = e.getY();
            repaint();

}
        public void mouseEntered(MouseEvent e) {
        String s = "鼠标已进入窗体";
        stata.setText(s);      //设置文本框显示鼠标已进入窗体字符串
        }
        public void mouseExited(MouseEvent e) {
    String s = "鼠标已移出窗体";
    stata.setText(s);
        }
        public void mouseDragged(MouseEvent e) {
        String s = "鼠标拖动到位置(" + e.getX() + "," + e.getY() + ")"; //取得鼠标坐标
        stata.setText(s);        //设置文本框显示鼠标拖动坐标
        if(flag == 1||flag == 2)
        {
        MAX++;
        dosave();
        csave[MAX - 1].x1 = e.getX();
        csave[MAX].x2 = csave[MAX].x1 = e.getX();
        csave[MAX - 1].y1 = e.getY();
        csave[MAX].y2 = csave[MAX].y1 = e.getY();
           //System.out.println(MAX);
        }
        if(flag == 15)
        {
        MAX++;
        dosave();
        csave[MAX].x2 = csave[MAX].x1 = e.getX();
        csave[MAX].y2 = csave[MAX].y1 = e.getY();
           //System.out.println(MAX);
        }
        csave[MAX].x2 = e.getX();
        csave[MAX].y2 = e.getY();
        repaint();
        }
        public void mouseMoved(MouseEvent e) { //鼠标移动方法
        String s = "鼠标移动到位置(" + e.getX() + "," + e.getY() + ")"; //取得鼠标坐标
        stata.setText(s);        //设置文本框显示鼠标拖动坐标
        }
@Override
public void mouseClicked(MouseEvent e) {
// TODO Auto-generated method stub
    repaint();
}
    }
    private class checkBox implements ItemListener {
        public void itemStateChanged(ItemEvent e) {
            if (e.getSource() == rb) {
                if (e.getStateChange() == ItemEvent.SELECTED) {isb = Font.BOLD;} 
                else {isb = Font.PLAIN;}
            }
            if (e.getSource() == ri) {
                if (e.getStateChange() == ItemEvent.SELECTED) {isi = Font.ITALIC;} 
                else {isi = Font.PLAIN;}
            }
            System.out.println(isb+" "+isi);
        }
    }
    
   public static void main(String[] args)
   {
  SwingUtilities.invokeLater(new Runnable() {

@Override
  public void run() {
  new MYPAINT();
  }
  });
   }
}
class shap implements Serializable
{
    int x1, y1, x2, y2,R=100, G=100, B=100;
    float cx;           int m = 0;
    String zti;      
    String s;
    int isb,isi;
    int time,max;
    int fx[] = new int[100];int fy[] = new int[100];
    void draw(Graphics2D g) {
    };
}
class PAN extends shap//画笔
{
    void draw(Graphics2D g) {

g.setColor(new Color(R, G, B));
        g.setStroke(new BasicStroke(cx,BasicStroke.CAP_ROUND, BasicStroke.JOIN_BEVEL));
        g.drawLine(x1, y1, x2, y2);
    }
}
class PENQI extends shap//喷漆
{
    void draw(Graphics2D g) {

g.setColor(new Color(R, G, B));
        g.setStroke(new BasicStroke(max/20,BasicStroke.CAP_ROUND, BasicStroke.JOIN_BEVEL));
        for(int i = 0;i<100;i++)
        {   
        double d = (double)fx[i];
        double c = (double)fy[i];
        g.drawLine((int) (x1+d*Math.sin(d)), (int) (y1+c*Math.sin(c)), (int) (x2+d*Math.sin(d)), (int) (y2+c*Math.sin(c)));
        }
    }
}
class XPC extends shap//橡皮擦
{
    void draw(Graphics2D g) {
        g.setColor(new Color(255, 255, 255));
        g.setStroke(new BasicStroke(cx + 4,
                BasicStroke.CAP_ROUND, BasicStroke.JOIN_BEVEL));
        g.drawLine(x1, y1, x2, y2);
    }
}
class TEXT extends shap//文字
{
    void draw(Graphics2D g) {

g.setColor(new Color(R, G, B));
        g.setFont(new Font(zti, isb+isi, ((int) cx) * 20));
        if (s != null) {
            g.drawString(s, x1, y1);
        }
        System.out.println(s+","+ x1+","+x2+","+m);
    }
}
class ZX extends shap //直线
{
    void draw(Graphics2D g) {
        g.setColor(new Color(R, G, B));
        g.setStroke(new BasicStroke(cx, BasicStroke.CAP_ROUND, BasicStroke.JOIN_BEVEL));
        g.drawLine(x1, y1, x2, y2);
    }
}
class ZFX extends shap//正方形
{
    void draw(Graphics2D g) {
        g.setColor(new Color(R, G, B));
        g.setStroke(new BasicStroke(cx));
        g.drawRect(Math.min(x1, x2), Math.min(y1, y2), Math.abs(x1 - x2), Math.abs(y1 - y2));
    }
}
class SZFX extends shap//实心正方形
{
    void draw(Graphics2D g) {
        g.setColor(new Color(R, G, B));
        g.setStroke(new BasicStroke(cx));
        g.fillRect(Math.min(x1, x2), Math.min(y1, y2),
                Math.abs(x1 - x2), Math.abs(y1 - y2));
    }
}
class SJX extends shap//三角形
{
    void draw(Graphics2D g) {
        g.setColor(new Color(R, G, B));
        g.setStroke(new BasicStroke(cx));
        int x3 = (x1+x2)/2;
        g.drawLine(x1, y2, x3, y1);
        g.drawLine( x3, y1, x2, y2);
        g.drawLine( x1, y2, x2, y2);
    }
}
class SSJX extends shap//实心三角形
{
    void draw(Graphics2D g) {
        g.setColor(new Color(R, G, B));
        g.setStroke(new BasicStroke(cx));
        int x3 = (x1+x2)/2;
        g.drawLine(x1, y2, x3, y1);
        g.drawLine( x3, y1, x2, y2);
        g.drawLine( x1, y2, x2, y2);
  
    }
}
class TY extends shap//椭圆
{
    void draw(Graphics2D g) {
        g.setColor(new Color(R, G, B));
        g.setStroke(new BasicStroke(cx));
        g.drawOval(Math.min(x1, x2), Math.min(y1, y2),
                Math.abs(x1 - x2), Math.abs(y1 - y2));
    }
}
class STY extends shap//实心椭圆
{
    void draw(Graphics2D g) {
        g.setColor(new Color(R, G, B));
        g.setStroke(new BasicStroke(cx));
        g.fillOval(Math.min(x1, x2), Math.min(y1, y2),
                Math.abs(x1 - x2), Math.abs(y1 - y2));
    }
}
class YX extends shap//圆形
{
    void draw(Graphics2D g) {
        g.setColor(new Color(R, G, B));
        g.setStroke(new BasicStroke(cx));
        g.drawOval(Math.min(x1, x2), Math.min(y1, y2),
                Math.max(Math.abs(x1 - x2), Math.abs(y1 - y2)),
                Math.max(Math.abs(x1 - x2), Math.abs(y1 - y2)));
    }
}
class SYX extends shap//实心圆形
{
    void draw(Graphics2D g) {
        g.setColor(new Color(R, G, B));
        g.setStroke(new BasicStroke(cx));
        g.fillOval(Math.min(x1, x2), Math.min(y1, y2),
                Math.max(Math.abs(x1 - x2), Math.abs(y1 - y2)),
                Math.max(Math.abs(x1 - x2), Math.abs(y1 - y2)));
    }
}
class YJJX extends shap//圆角矩形
{
    void draw(Graphics2D g) {
        g.setColor(new Color(R, G, B));
        g.setStroke(new BasicStroke(cx));
        g.drawRoundRect(Math.min(x1, x2), Math.min(y1, y2),Math.abs(x1 - x2), Math.abs(y1 - y2),50, 35);
    }
}
class SYJJX extends shap//实现圆角矩形
{
    void draw(Graphics2D g) {
        g.setColor(new Color(R, G, B));
        g.setStroke(new BasicStroke(cx));
        g.fillRoundRect(Math.min(x1, x2), Math.min(y1, y2), Math.abs(x1 - x2), Math.abs(y1 - y2),50, 35);
    }
}

/*无用调试*/
class TESE extends JPanel{
public void paint(Graphics g){
g.drawLine(6,150,50,50);
g.drawLine(6,150,50,150);
g.drawRect(60,30,100,30);
g.draw3DRect(60,160,100,30,true);
g.drawRoundRect(60, 200, 100, 40, 10, 10);
g.drawArc(200,50,10,8,0,45);
g.drawOval(200,150,80,80);
g.drawString("测试绘制文字", 200, 250);
Color c = Color.RED;
g.setColor(c);
g.fillOval(200, 100,100 , 40);
g.setColor(Color.PINK);
g.fill3DRect(60,80,100,30,true);
g.setColor(Color.BLUE);

g.fillArc(200, 200, 100, 80, 0, 45);
Font f = new Font("黑体",Font.ITALIC,60);
g.setFont(f);
g.drawString("欢迎访问",10,300);
}
}

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