java 画板画图程序，java画板画图,import java.

java 画板画图程序，java画板画图,import java.

import java.awt.*;import javax.swing.*;import java.awt.event.*;public class Board {    /**     * @param args     */    public static void main(String[] args) {        // TODO Auto-generated method stub        Winmain win = new Winmain();    }}class Winmain extends JFrame implements ActionListener, MouseMotionListener {// 主窗口    static int pensize, erasersize;// 画笔大小和橡皮大小    static int size;    static Color pencolor;// 画笔颜色    JButton but1, but2, but3, but4;    JPanel panel;    Winmain() {        super("自由画图程序");        this.setSize(250, 150);        setBackground(Color.white);// 背景为白色        Container con = getContentPane();        con.setLayout(new BorderLayout());        JPanel pa = new JPanel();        pa.setLayout(new GridLayout(1, 4));        but1 = new JButton("画笔");// 快速转换到画笔        but1.addActionListener(this);        pa.add(but1);        but2 = new JButton("橡皮");// 快速转换到橡皮        but2.addActionListener(this);        pa.add(but2);        but3 = new JButton("画笔…");// 打开画笔设置界面        but3.addActionListener(this);        pa.add(but3);        but4 = new JButton("橡皮…");// 打开橡皮设置界面        but4.addActionListener(this);        pa.add(but4);        con.add(pa, "North");        panel = new JPanel();        panel.setBackground(Color.white);// 设置背景为白色        panel.addMouseMotionListener(this);        con.add(panel, "Center");        pencolor = Color.black;// 初始画笔颜色为黑色        pensize = 3;// 初始画笔大小半径为3个像素点        erasersize = 5;// 初始橡皮大小半径为5个像素点        size = 3;        setVisible(true);        pack();    }    public static void setpen(int pensize2, Color pencolor2) {// 与设置画笔界面的接口        pensize = pensize2;        pencolor = pencolor2;        size = pensize;    }    public static void seteraser(int erasersize2) {// 与设置橡皮界面的接口        erasersize = erasersize2;        pencolor = Color.white;        size = erasersize;    }    public void actionPerformed(ActionEvent e1) {        if (e1.getSource() == but1) {            pensize = 3;            size = pensize;            pencolor = Color.black;        } else if (e1.getSource() == but2) {            erasersize = 5;            size = erasersize;            pencolor = Color.white;        } else if (e1.getSource() == but3) {// 打开画笔设置界面            Winpen741 w741 = new Winpen741();            w741.setVisible(true);        } else if (e1.getSource() == but4) {// 打开橡皮设置界面            Wineraser742 w742 = new Wineraser742();            w742.setVisible(true);        }    }    public void mouseDragged(MouseEvent e2) {// 拖动鼠标自由作画        int x, y;        x = e2.getX();        y = e2.getY();        Graphics pen;        pen = getGraphics();        pen.setColor(pencolor);        pen.fillOval(x - size + 7, y - size + 56, 2 * size, 2 * size);// +7和+56是为了矫正画笔位置    }    public void mouseMoved(MouseEvent e3) {    }}class Winpen741 extends JFrame implements ActionListener {// 设置画笔界面    JButton but, but1, but2, but3, but4, but5, but6;    JTextField tf;    Color c;    int pensize;    Winpen741() {        super();        setSize(300, 150);        Container con = getContentPane();        con.setLayout(new GridLayout(2, 1));        JPanel p1 = new JPanel();        p1.setLayout(new GridLayout(2, 3));        but1 = new JButton();        but1.setBackground(Color.pink);        but1.addActionListener(this);        p1.add(but1);        but2 = new JButton();        but2.setBackground(Color.blue);        but2.addActionListener(this);        p1.add(but2);        but3 = new JButton();        but3.setBackground(Color.yellow);        but3.addActionListener(this);        p1.add(but3);        but4 = new JButton();        but4.setBackground(Color.gray);        but4.addActionListener(this);        p1.add(but4);        but5 = new JButton();        but5.setBackground(Color.green);        but5.addActionListener(this);        p1.add(but5);        but6 = new JButton();        but6.setBackground(Color.red);        but6.addActionListener(this);        p1.add(but6);        con.add(p1);        JPanel p2 = new JPanel();        p2.setLayout(new GridLayout(1, 3));        JLabel la = new JLabel("输入画笔的大小");        p2.add(la);        tf = new JTextField(16);        p2.add(tf);        but = new JButton("确定");        but.addActionListener(this);        p2.add(but);        con.add(p2);    }    public void actionPerformed(ActionEvent e) {        if (e.getSource() == but1)            c = Color.pink;        else if (e.getSource() == but2)            c = Color.blue;        else if (e.getSource() == but3)            c = Color.yellow;        else if (e.getSource() == but4)            c = Color.gray;        else if (e.getSource() == but5)            c = Color.green;        else if (e.getSource() == but6)            c = Color.red;        else if (e.getSource() == but) {            String s = null;            s = tf.getText();            pensize = Integer.parseInt(s);            Winmain.setpen(pensize, c);// 返回画笔大小和颜色            this.setVisible(false);            this.dispose();        }    }}class Wineraser742 extends JFrame implements ActionListener {// 设置橡皮界面    JTextField tf;    JButton but;    int erasersize;    Wineraser742() {        super();        setSize(300, 150);        Container con = getContentPane();        con.setLayout(new GridLayout(1, 3));        JLabel la = new JLabel("输入橡皮的大小");        con.add(la);        tf = new JTextField(16);        con.add(tf);        but = new JButton("确定");        but.addActionListener(this);        con.add(but);    }    public void actionPerformed(ActionEvent e) {        if (e.getSource() == but) {            String s = null;            s = tf.getText();            erasersize = Integer.parseInt(s);            Winmain.seteraser(erasersize);// 返回橡皮大小            this.setVisible(false);            this.dispose();        }    }}