java 画板画图程序

[java]代码库

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();
		}
	}
}