画图板

一个简单的画图板程序。

用到的图片在附件中。（新手，多包涵）

 

 

package netjava0626;

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
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;

//定义一个画板类
public class DrawingBoard {
	private String biaozhi = "huabi";
	private String   color;
	private Graphics g;
	private int x1, y1, x2, y2, x3, y3,  w, h;
	private JLabel lab;
	// 初始化面板并实现组建
	public void show() {
		JFrame frame = new JFrame();
		// 创建一个工具栏
		JButton but01 = new JButton("文件（F）");
		JButton but02 = new JButton("编辑（E）");
		JButton but03 = new JButton("查看（V）");
		JButton but04 = new JButton("图像（I）");
		JButton but05 = new JButton("颜色（C）");
		JButton but06 = new JButton("帮助（H）");
		JToolBar bar = new JToolBar();
		bar.add(but01);
		bar.add(but02);
		bar.add(but03);
		bar.add(but04);
		bar.add(but05);
		bar.add(but06);
		frame.add(bar, BorderLayout.NORTH);
		//创建颜色框的监听器
		ActionListener a3 = new ActionListener(){

			public void actionPerformed(ActionEvent e) {
//设置颜色
				color = e.getActionCommand();
				if(color.equals("Color.black") ){
				
					g.setColor(Color.black);
					lab.setBackground(Color.black);
				}else if(color.equals("Color.gray")){
					
					g.setColor(Color.gray);
					lab.setBackground(Color.gray);
				}else if(color.equals("Color.darkGray")){
					g.setColor(Color.darkGray);
					lab.setBackground(Color.darkGray);
				}else if(color.equals("Color.green")){
					
					g.setColor(Color.green);
					lab.setBackground(Color.green);
				}else if(color.equals("Color.LIGHT_GRAY")){
					
					g.setColor(Color.LIGHT_GRAY);
					lab.setBackground(Color.LIGHT_GRAY);
				}else if(color.equals("Color.magenta")){
					g.setColor(Color.magenta);
					lab.setBackground(Color.magenta);
				}else if(color.equals("Color.orange")){
					g.setColor(Color.orange);
					lab.setBackground(Color.orange);
				}else if(color.equals("Color.pink")){
					
					g.setColor(Color.pink);
					lab.setBackground(Color.pink);
				}else if(color.equals("Color.red")){
					g.setColor(Color.red);
					lab.setBackground(Color.red);
					
				}else if(color.equals("Color.white")){
					
					g.setColor(Color.white);
					lab.setBackground(Color.white);
				}	
			}
		};
		// 创建监听器
		ActionListener al = new ActionListener() {

			@Override
			public void actionPerformed(ActionEvent e) {

				biaozhi = e.getActionCommand();

			}

		};
		// 创建工具面板
		JPanel panel01 = new JPanel();
		panel01.setPreferredSize(new Dimension(60, 104));
		String[] arr = { "duobianxing", "Xjuxing", "ca", "tianchong", "dianbi",
				"fangdajing", "huabi", "shuazi", "youqitong", "bianji",
				"zhixian", "quxian", "juxing", "shouwei", "tuoyuan", "yuanji" };
		for (int i = 0; i < arr.length; i++) {
			ImageIcon img = new ImageIcon("DrawImages/" + arr[i] + ".jpg");
			JButton but = new JButton(img);
			but.setActionCommand(arr[i]);
			but.addActionListener(al);
			but.setPreferredSize(new Dimension(24, 22));
			panel01.add(but);
		}
		frame.add(panel01, BorderLayout.WEST);

		// 颜色选项栏
		JPanel panel02 = new JPanel();
		panel02.setPreferredSize(new Dimension(100, 50));
		panel02.setLayout(null);
		JPanel panel04 = new JPanel();
		panel04.setPreferredSize(new Dimension(100, 40));
//		panel04.setBackground(Color.white );
		panel04.setLayout(new GridLayout(2, 5));

		Color [] arr02={Color.black,Color.gray,Color.darkGray,Color.green,Color.LIGHT_GRAY,Color.magenta,
				Color.orange,Color.pink,Color.red,Color.white};
		String[] arr01 = {"Color.black","Color.gray","Color.darkGray","Color.green","Color.LIGHT_GRAY","Color.magenta",
				"Color.orange","Color.pink","Color.red","Color.white"};
		lab = new JLabel();
		lab.setPreferredSize(new Dimension());
		lab.setOpaque(true);
		lab.setBackground(Color.black);
		lab.setBounds(60, 0, 47, 50);
		for (int i = 0; i < arr02.length; i++) {
			
			
			JButton but = new JButton();		
			but.setBackground(arr02[i]);
			but.setActionCommand(arr01[i]);
			but.setPreferredSize(new Dimension(16, 16));
			but.addActionListener(a3);
			panel04.add(but);

		}
		panel02.add(lab);
		panel04.setBounds(107, 0, 100, 50);
		panel02.add(panel04);
		
		frame.add(panel02, BorderLayout.SOUTH);

		// 画布
		JPanel panel03 = new JPanel();
		panel03.setPreferredSize(new Dimension(694, 400));
		panel03.setBackground(Color.WHITE);
		frame.add(panel03, BorderLayout.CENTER);
		frame.setTitle("画图板");
		frame.setSize(754, 508);
		frame.setResizable(false);
		frame.setLocationRelativeTo(null);
		frame.setDefaultCloseOperation(3);

		MouseListener a1 = new MouseAdapter() {
			// 鼠標按下時獲得坐标
			public void mousePressed(MouseEvent e) {
				x1 = e.getX();
				y1 = e.getY();
			}
			// 鼠标松开时获取坐标
			public void mouseReleased(MouseEvent e) {
				x2 = e.getX();
				y2 = e.getY();
				if (biaozhi.equals("shouwei")) {
					g.drawLine(x1, y1, x1, y1);

				} else if (biaozhi.equals("dianbi")) {

				} else if (biaozhi.equals("zhixian")) {

					g.drawLine(x1, y1, x2, y2);
				} else if (biaozhi.equals("juxing")) {
					if (x2 > x1 && y2 > y1) {
						x3 = x1;
						y3 = y1;
						w = Math.abs(x2 - x1);
						h = Math.abs(y2 - y1);
						g.drawRect(x3, y3, w, h);
					} else if (x2 > x1 && y2 < y1) {
						x3 = x1;
						y3 = y2;
						w = Math.abs(x2 - x1);
						h = Math.abs(y2 - y1);
						g.drawRect(x3, y3, w, h);
					} else if (x2 < x1 && y2 < y1) {
						x3 = x2;
						y3 = y2;
						w = Math.abs(x2 - x1);
						h = Math.abs(y2 - y1);
						g.drawRect(x3, y3, w, h);
					} else {
						x3 = x2;
						y3 = y1;
						w = Math.abs(x2 - x1);
						h = Math.abs(y2 - y1);
						g.drawRect(x3, y3, w, h);
					}
				} else if (biaozhi.equals("tuoyuan")) {
					if (x2 > x1 && y2 > y1) {
						x3 = x1;
						y3 = y1;
						w = Math.abs(x2 - x1);
						h = Math.abs(y2 - y1);
						g.drawOval(x3, y3, w, h);
					} else if (x2 > x1 && y2 < y1) {
						x3 = x1;
						y3 = y2;
						w = Math.abs(x2 - x1);
						h = Math.abs(y2 - y1);
						g.drawOval(x3, y3, w, h);
					} else if (x2 < x1 && y2 < y1) {
						x3 = x2;
						y3 = y2;
						w = Math.abs(x2 - x1);
						h = Math.abs(y2 - y1);
						g.drawOval(x3, y3, w, h);
					} else {
						x3 = x2;
						y3 = y1;
						w = Math.abs(x2 - x1);
						h = Math.abs(y2 - y1);
						g.drawOval(x3, y3, w, h);
					}
				} else if (biaozhi.equals("yuanji")) {
					if (x2 > x1 && y2 > y1) {
						x3 = x1;
						y3 = y1;
						w = Math.abs(x2 - x1);
						h = Math.abs(y2 - y1);
						g.drawRoundRect(x3, y3, w, h, 20, 20);
					} else if (x2 > x1 && y2 < y1) {
						x3 = x1;
						y3 = y2;
						w = Math.abs(x2 - x1);
						h = Math.abs(y2 - y1);
						g.drawRoundRect(x3, y3, w, h, 20, 20);
					} else if (x2 < x1 && y2 < y1) {
						x3 = x2;
						y3 = y2;
						w = Math.abs(x2 - x1);
						h = Math.abs(y2 - y1);
						g.drawRoundRect(x3, y3, w, h, 20, 20);
					} else {
						x3 = x2;
						y3 = y1;
						w = Math.abs(x2 - x1);
						h = Math.abs(y2 - y1);
						g.drawRoundRect(x3, y3, w, h, 20, 20);
					}

				}
			}
		};
		// 添加拖動時的方法
		MouseMotionListener a2 = new MouseMotionAdapter() {

			public void mouseDragged(MouseEvent e) {
				x3 = e.getX();
				y3 = e.getY();
				// 当鼠标在拖动时也要注意对坐标的赋值
				if (biaozhi.equals("huabi")) {
					g.drawLine(x1, y1, x3, y3);
					x1 = x3;
					y1 = y3;
				} else if (biaozhi.equals("ca")) {
					g.setColor(Color.white);
					g.fillRect(x1, y1, 10, 20);
					x1 = x3;
					y1 = y3;
					g.setColor(Color.black);
				} else if (biaozhi.equals("shuazi")) {

					g.fillRect(x1, y1, 5, 5);
					x1 = x3;
					y1 = y3;

				} else if (biaozhi.equals("youqitong")) {
					for (int i = 0; i < 20; i++) {
						int j = (int) (Math.random() * 10);
						int k = (int) (Math.random() * 10);
						g.drawLine(x3 + j, y3 + k, x3 + j, y3 + k);
					}

				}
			}
		};
		panel03.addMouseListener(a1);
		panel03.addMouseMotionListener(a2);
		frame.setVisible(true);
		g = panel03.getGraphics();
	}

	public static void main(String[] args) {

		DrawingBoard draw = new DrawingBoard();
		draw.show();

	}

}