drawplat.java

用JAVA实现。一个简单的画图软件。可以进行简单的操作。还可以实现简单的图形绘画。如三角形等。

package DrawPlat;

import javax.swing.*;











import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Container;
import java.awt.Cursor;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionAdapter;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.io.*;

public class DrawPlat  extends JFrame  {
	private ObjectInputStream input;
	private ObjectOutputStream output;
	Image offScreenImage = null;
	DrawPlat mdp;
	
	private JButton choices[]; //按钮数组，存放一下名称的功能按钮
	
	private String names[] = {
			"New",
			"Open",
			"Save", 
			"Pencil", 
			"Line",   
			"Rect",   
			"fRect",  
			"Oval",   
			"fOval",  
			"Circle", 
			"fCircle",
			"RoundRect",
			"frRect", 
			"Rubber",
			"Color", 
			"Stroke"		
	};
	

	
	private Icon items[];
	
	private String tipText[] = {
			//这里是鼠标移动到相应按钮上面停留时给出的提示说明条
			//读者可以参照上面的按钮定义对照理解
			"Draw a new picture",
			"Open a saved picture",
			"Save current drawing",
			"Draw at will",
			"Draw a straight line",
			"Draw a rectangle",
			"Fill a rectangle",
			"Draw a oval",
			"Fill a oval",
			"Darw a circle",
			"Fill a circle",
			"Draw a round rectangle",
			"Fill a round rectangle",
			"Erase at will",
			"Choose current drawing color",			
			"Set current drawing stroke",

	};
	
	JToolBar buttonPanel; //定义按钮面板
	
	public JLabel statusBar; //显示鼠标状态的提示条
	
	public DrawPanel drawingArea; 	//定义画图区域
	
	private int width = 800,height = 650; //定义画图区域的初始大小
	
	public drawings[] itemList = new drawings[5000];//用来存放基本图形的数组

	public int[] records= new int[5000];
	
	public int currentChoice = 3;		//设置默认画图状态为随笔画
	public int index = 0;						//当前已经绘制的图形的数目
	
	private Color color = Color.black;	//设置当前画笔颜色
	int R,G,B;		//用来存放当前的颜色值
	

	private float stroke = 1.0f; 	//设置画笔粗细，默认值为1.0f
	

	public DrawPlat(){
		super("Drawing Pad");
		mdp = this;
		JMenuBar bar = new JMenuBar();//定义菜单栏
		JMenu fillMenu = new JMenu("File");
		fillMenu.setMnemonic('F');
	//新建文件菜单项
		JMenuItem newItem = new JMenuItem("New");
		newItem.setMnemonic('N');
		newItem.addActionListener(
				new ActionListener(){
					public void actionPerformed(ActionEvent e) {						
						newFile(); //如果被触发，则调用新建文件函数段
					}
				}
		);
		fillMenu.add(newItem);
		
	//保存文件菜单项
		JMenuItem saveItem = new JMenuItem("Save");
		saveItem.setMnemonic('S');
		saveItem.addActionListener(
				new ActionListener() {

					
					public void actionPerformed(ActionEvent e) {
						saveFile(); //如果被触发，则调用保存文件函数段
					}
					
				}
		);
		fillMenu.add(saveItem);
		
	//打开文件菜单项
		JMenuItem loadItem = new JMenuItem("Load");
		loadItem.setMnemonic('L');
		loadItem.addActionListener(
				new ActionListener() {

					
					public void actionPerformed(ActionEvent e) {
						
						loadFile(); 	//如果被触发，则调用打开文件函数段
					}
					
				}
		);
		fillMenu.add(loadItem);
		
		
		fillMenu.addSeparator();
		
	//退出菜单项
		JMenuItem exitItem = new JMenuItem("Exit");
		exitItem.setMnemonic('X');
		exitItem.addActionListener(
				new ActionListener() {

				
					public void actionPerformed(ActionEvent e) {
						
						System.exit(0); //如果触发。则推出画图板程序
					}
					
				}
		);
		fillMenu.add(exitItem);
		bar.add(fillMenu);
		
	//设置颜色菜单栏
		JMenu colorMenu = new JMenu("Color");
		colorMenu.setMnemonic('C');
		
	//选择颜色菜单项
		JMenuItem colorItem = new JMenuItem("Choose Color");
		colorItem.setMnemonic('O');
		colorItem.addActionListener(
				new ActionListener() {

					
					public void actionPerformed(ActionEvent e) {
						chooseColor(); //如果被触发，则调用选择颜色函数段
						
					}
					
				}
		);
		colorMenu.add(colorItem);
		bar.add(colorMenu);
		
	//设置线条粗细菜单栏
		JMenu strokeMenu = new JMenu("Stroke");
		strokeMenu.setMnemonic('S');
		
	//设置线条粗细菜单项
		JMenuItem strokeItem = new JMenuItem("Set Stroke");
		strokeItem.setMnemonic('K');
		strokeItem.addActionListener(
				new ActionListener() {

					@Override
					public void actionPerformed(ActionEvent e) {
						// TODO Auto-generated method stub
						setStroke();
					}
					
				}
		);
		strokeMenu.add(strokeItem);
		bar.add(strokeMenu);
		
	//设置提示菜单栏
		JMenu helpMenu = new JMenu("help");
		helpMenu.setMnemonic('H');
		
	//设置提示菜单项
		JMenuItem aboutItem = new JMenuItem("About this Drawing Pad");
		aboutItem.setMnemonic('A');
		aboutItem.addActionListener(
				new ActionListener() {

					@Override
					public void actionPerformed(ActionEvent e) {
						// TODO Auto-generated method stub
						JOptionPane.showConfirmDialog(null,
								"This is a mini drawing pad!\n" +
								"Copyright (c) 2008 xidian University",
								"画图板程序说明",
								JOptionPane.INFORMATION_MESSAGE);
					}
					
				}
		);
		helpMenu.add(aboutItem);
		bar.add(helpMenu);
		
		items = new ImageIcon[names.length];
	//创建各种基本图形的按钮
		drawingArea = new DrawPanel(this);

		choices = new JButton[names.length];
		buttonPanel = new JToolBar(JToolBar.VERTICAL);

		ButtonHandler handler = new ButtonHandler();
		ButtonHandler1 handler1 = new ButtonHandler1();
		

		for(int i = 0; i < choices.length; i++) {

			
			items[i] = new ImageIcon(getClass().getResource("/Images/"+names[i]+".GIF"));
						

			choices[i] = new JButton(items[i]);

			choices[i].setToolTipText(tipText[i]);
			buttonPanel.add(choices[i]);
			
		}
		
	//将动作侦听器加入按钮里
		for(int i = 3; i < choices.length-2; i++ ) {
			choices[i].addActionListener(handler);
		}
		
		choices[0].addActionListener(
				new ActionListener() {

					@Override
					public void actionPerformed(ActionEvent e) {
						// TODO Auto-generated method stub
						newFile();
					}
					
				}
		);
		
		choices[1].addActionListener(
				new ActionListener() {

					@Override
					public void actionPerformed(ActionEvent e) {
						// TODO Auto-generated method stub
						loadFile();
					}
					
				}
		);
		
		choices[2].addActionListener(
				new ActionListener() {

					@Override
					public void actionPerformed(ActionEvent e) {
						// TODO Auto-generated method stub
						saveFile();
					}
					
				}
		);
//		choices[choices.length - 3].addActionListener(handler1);
		choices[choices.length - 2].addActionListener(handler1);
		choices[choices.length - 1].addActionListener(handler1);
		

		

		
		Container c = getContentPane();
		super.setJMenuBar(bar);
		c.add(buttonPanel, BorderLayout.WEST);
		c.add(drawingArea,BorderLayout.CENTER);
		
		statusBar =  new JLabel();
		c.add(statusBar, BorderLayout.SOUTH);
		statusBar.setText("		Welcome To The Little Drawing Pad!!!	:");
		
		
		createNewItem();

		setSize(width,height);
		
		setVisible(true);
		
		
		
	}

	
//按钮侦听器ButtonHandler类，内部类，用来侦听基本按钮的操作
	public class ButtonHandler implements ActionListener {