drawer.java

java画图程序. 能完成大多数的功能.

/**
 * 画图程序主面板。界面的初始化。
 * created by LHand on May 12th.
 */
package cn.edu.xmu.LHand;
import javax.swing.*;
import java.util.ArrayList;
import java.io.*;
import java.awt.*;
import java.awt.event.*;

public class Drawer extends JFrame{
	
	private JMenuBar menuBar;
	private JToolBar toolbar;
	private JButton button1;
	private JButton button2;
	private JButton button3;
	private JButton button4;
	private JButton button5;
	private JButton button6;
	private JButton button7;
	private JButton button8;
	private DrawBoard drawboard;
	private ButtonGroup graphButtonGroup;
	private JComboBox stroke;
	private JButton foreColor;
	private JButton backColor; 
	private JButton eraser;
	private ObjectInputStream input;
	private ObjectOutputStream output;
	private ArrayList shapes = new ArrayList(); 
	public static JLabel statusBar = new JLabel("                               |"
			+"       |");
	

	
	public Drawer(){
		super("画图");
		initInterface();                               
	}
	
	
	//初始化界面
	private void initInterface(){
		
		toolbar = new JToolBar("工具栏");			  //初始化工具栏
		drawboard = new DrawBoard();       			  //初始化画板
		menuBar = new JMenuBar(); 	  				 //初始化菜单栏		
		
		//界面布局
		Container container = getContentPane();
		container.add(toolbar,BorderLayout.WEST);
		container.add(new JScrollPane(drawboard),BorderLayout.CENTER);
		container.add(menuBar,BorderLayout.NORTH);
		container.add(statusBar,BorderLayout.SOUTH);
		this.setBackground(Color.gray);
		this.setMinimumSize(new Dimension(650,600));
		this.setLocation(200,100);
		setVisible(true);
		//布局结束
		
		//菜单栏JMenuBar
		JMenuItem openItem = new JMenuItem("打开(O)");
		openItem.setMnemonic('O');
		//添加选择打开文件事件
		openItem.addActionListener(new ActionListener(){
			public void actionPerformed(ActionEvent event){
				openFile();
			}
		});
		
		JMenuItem saveItem = new JMenuItem("保存(S)");
		saveItem.setMnemonic('S');
		saveItem.addActionListener(new ActionListener(){
				public void actionPerformed(ActionEvent event){
					saveFile();
				
				}
			}
		);
		
		JMenuItem exitItem = new JMenuItem("退出(E)");
		exitItem.setMnemonic('E');
		exitItem.addActionListener(new ActionListener(){
				public void actionPerformed(ActionEvent event){
					System.exit(0);
				
				}
			}
		);
		
		
		JMenu fileMenu = new JMenu("文件(F)");
		fileMenu.setMnemonic('F');
		fileMenu.add(openItem);
		fileMenu.add(saveItem);
		fileMenu.add(exitItem);
		menuBar.add(fileMenu);
		
		//编辑文件选项
		JMenuItem moveItem = new JMenuItem("撤销(U)");
		moveItem.setMnemonic('U');
		moveItem.addActionListener(new ActionListener(){
				public void actionPerformed(ActionEvent event){
					int index = DrawBoard.IShapes.size();
					index--;
					if(index<0)
						return;
					shapes.add(DrawBoard.IShapes.get(index));
					DrawBoard.IShapes.remove(index);
					repaint();
				}
			}
		);
		
		JMenuItem repetitionItem = new JMenuItem("重复('R')");
		repetitionItem.setMnemonic('R');
		repetitionItem.addActionListener(new ActionListener(){
				public void actionPerformed(ActionEvent event){
					int index = shapes.size();
					index--;
					if(index<0)
						return;
					DrawBoard.IShapes.add(shapes.get(index));
					shapes.remove(index);
					repaint();
					
					
				}
			}
		);
		
		JMenu editMenu = new JMenu("编辑(E)");
		editMenu.add(moveItem);
		editMenu.add(repetitionItem);
		menuBar.add(editMenu);
			
		//画笔粗细JPanel
		String[] strokes = new String[]{
				"Stroke Weight 1f","Stroke Weight 2f","Stroke Weight 5f",
				"Stroke Weight 7.5f","Stroke Weight 10f",
		};
		stroke = new JComboBox(strokes);
		
		//添加内部类处理事件
		stroke.addItemListener(new ItemListener(){
			public void itemStateChanged(ItemEvent event){
				if(event.getStateChange() == ItemEvent.SELECTED){
					DrawBoard.strokeIndex = stroke.getSelectedIndex();
				}
			}
		}
		);
		stroke.setMaximumRowCount(3);
		stroke.setMaximumSize(new Dimension(160,50));
		stroke.setBorder(new javax.swing.border.TitledBorder("stroke changes"));
		
		//工具栏JPanel
		JPanel toolPanel = new JPanel();
		toolPanel.setBorder(new javax.swing.border.TitledBorder("Drawing Tools"));
		toolPanel.setLayout(new GridLayout(4, 2, 5, 5));
		toolPanel.setMaximumSize(new Dimension(185,135));
		buttonsActionHandle handle = new buttonsActionHandle();
		
	    button1 = new JButton("Word");
		button1.setToolTipText("文字");
		button1.addActionListener(handle);
	
		button2 = new JButton("Line");
		button2.setToolTipText("直线");
		button2.addActionListener(handle);
		
		button3 = new JButton("Rect");
		button3.setToolTipText("矩形");
		button3.addActionListener(handle);
		
		button4 = new JButton("ArcRect");
		button4.setToolTipText("圆角矩形");
		button4.addActionListener(handle);
		
		button5 = new JButton("Oval");
		button5.setToolTipText("椭圆");
		button5.addActionListener(handle);
		
		button6 = new JButton("Polygon");
		button6.setToolTipText("多边形");
		button6.addActionListener(handle);
		
		button7 = new JButton("Brush");
		button7.setToolTipText("刷子");
		button7.addActionListener(handle);
		
		button8 = new JButton("Pencil");
		button8.setToolTipText("铅笔");
		button8.addActionListener(handle);
		
		graphButtonGroup = new ButtonGroup();
		graphButtonGroup.add(button1);
		graphButtonGroup.add(button2);
		graphButtonGroup.add(button3);
		graphButtonGroup.add(button4);
		graphButtonGroup.add(button5);
		graphButtonGroup.add(button6);
		graphButtonGroup.add(button7);
		graphButtonGroup.add(button8);
		
		toolPanel.add(button1);
		toolPanel.add(button2);
		toolPanel.add(button3);
		toolPanel.add(button4);
		toolPanel.add(button5);
		toolPanel.add(button6);
		toolPanel.add(button7);
		toolPanel.add(button8);
		
		//前景与背景色JPanel
		JPanel colorPanel = new JPanel();
		colorPanel.setBorder(new javax.swing.border.TitledBorder("Color Settings"));
		foreColor = new JButton();
		foreColor.setToolTipText("前景色");
		foreColor.setPreferredSize(new Dimension(50, 50));
		foreColor.setBorder(new javax.swing.border.LineBorder(new Color(0,0,0)));
		foreColor.setBackground(Color.BLACK);
		foreColor.addActionListener(
				new ActionListener(){
					public void actionPerformed(ActionEvent event){
						Color color = new Color(0,0,0);
						color = JColorChooser.showDialog(Drawer.this,"前景色选择",color);
						
						if(color != null)
							foreColor.setBackground(color);
						drawboard.setForeground(foreColor.getBackground());
					}
					
				}
			);
		
				
		backColor = new JButton();
		backColor.setToolTipText("背景色");
		backColor.setPreferredSize(new Dimension(50, 50));
		backColor.setBorder(new javax.swing.border.LineBorder(new Color(0,0,0)));
		backColor.setBackground(Color.WHITE);
		backColor.addActionListener(
				new ActionListener(){
					public void actionPerformed(ActionEvent event){
						Color color = new Color(0,0,0);
						color = JColorChooser.showDialog(Drawer.this,"背景色选择",color);
						
						if(color != null)
							backColor.setBackground(color);
						drawboard.setBackground(backColor.getBackground());
						}
					
				}
			);
		
		colorPanel.add(foreColor);
		colorPanel.add(backColor);
		colorPanel.setMaximumSize(new Dimension(160,100));
		
		//清除面板
		JPanel clearPanel = new JPanel();
		JButton clearButton = new JButton("Clear");
		clearButton.setToolTipText("清空面板");
		clearButton.addActionListener(
				new ActionListener(){
					public void actionPerformed(ActionEvent event){
						drawboard.clearBoard();
						shapes.clear();
					}
				});
		clearPanel.add(clearButton);
		clearPanel.setBorder(new javax.swing.border.TitledBorder("ClearBoard"));
		clearPanel.setMaximumSize(new Dimension(160,60));
		
		//橡皮插 JPanel
		JPanel eraserPanel = new JPanel();
		eraserPanel.setBorder(new javax.swing.border.TitledBorder("EraserBoard"));
		eraser = new JButton("Eraser");
		eraser.setToolTipText("橡皮插");
		eraser.addActionListener(
			new ActionListener(){
				public void actionPerformed(ActionEvent event){
					DrawBoard.buttonPressed = 9;
				}
			}
		);
		eraserPanel.add(eraser);
		eraserPanel.setMaximumSize(new Dimension(160,60));
		
		
		toolbar.add(toolPanel);
		toolbar.add(stroke);
		toolbar.add(colorPanel);
		toolbar.add(clearPanel);
		toolbar.add(eraserPanel);
		toolbar.setOrientation(JToolBar.VERTICAL);

	}
	
	private void openFile(){
		
		JFileChooser fileChooser = new JFileChooser("C:\\Documents and Settings\\" +
				"Administrator\\My Documents\\My Pictures\\");
		fileChooser.setFileSelectionMode(JFileChooser.FILES_ONLY);
		//fileChooser.setFileFiter(Filefiter());  //设置文件过滤
		int result =fileChooser.showOpenDialog(this);
		
		if(result==JFileChooser.CANCEL_OPTION)
		    return ;
		File fileName=fileChooser.getSelectedFile();
		
		if (fileName==null||fileName.getName().equals("")){
		    JOptionPane.showMessageDialog(fileChooser,"Invalid File Name",
		        "Invalid File Name", JOptionPane.ERROR_MESSAGE);
		    openFile();
		}
		if(!fileName.canRead()){
			JOptionPane.showMessageDialog(this,"The file can't be read or not exit",
					"ErrorRend",JOptionPane.ERROR_MESSAGE);
			openFile();
		}
		try{
			 FileInputStream fis=new FileInputStream(fileName);
			 input = new ObjectInputStream(fis);
			 DrawBoard.IShapes = (ArrayList)input.readObject();
			 repaint();
		}
		catch (IOException ioException){
		     JOptionPane.showMessageDialog(this,"error during read from file",
		           "read Error",JOptionPane.ERROR_MESSAGE );
		}
		catch(ClassNotFoundException classNotFoundException){
		     JOptionPane.showMessageDialog(this,"Unable to Create Object",
		            "end of file",JOptionPane.ERROR_MESSAGE );
		      }
		
    }

		
	
	private void saveFile(){
		
		JFileChooser fileChooser = new JFileChooser("C:\\Documents and Settings\\" +
							"Administrator\\My Documents\\My Pictures\\");
		fileChooser.setFileSelectionMode(JFileChooser.FILES_ONLY);
		
		int result = fileChooser.showSaveDialog(this);
		if(result == JFileChooser.CANCEL_OPTION)
			return;
		File fileName = fileChooser.getSelectedFile();
		
		fileName.canWrite();
		if (fileName==null||fileName.getName().equals(""))
			
		  JOptionPane.showMessageDialog(fileChooser,"Invalid File Name",
		        "Invalid File Name", JOptionPane.ERROR_MESSAGE);
		
		else{
			
			try{
				fileName.delete();
				FileOutputStream fos = new FileOutputStream(fileName);
				output = new ObjectOutputStream(fos);
				output.writeObject(DrawBoard.IShapes);
				output.close();
				fos.close();
			
			}
			
			catch(IOException ioe)
			{
				ioe.printStackTrace();
			}
			return;
		 }
		
	}
   //画图工具监听器。
	private class buttonsActionHandle implements ActionListener{
	
		public void actionPerformed(ActionEvent event){
			if(event.getSource() == button1){
				DrawBoard.buttonPressed = 1;
			}
			if(event.getSource() == button2){
				DrawBoard.buttonPressed = 2;
			}
			if(event.getSource() == button3){
				DrawBoard.buttonPressed = 3;
			}
			if(event.getSource() == button4){
				DrawBoard.buttonPressed = 4;
			}
			if(event.getSource() == button5){
				DrawBoard.buttonPressed = 5;
			}
			if(event.getSource() == button6){
				DrawBoard.buttonPressed = 6;
			}
			if(event.getSource() == button7){
				DrawBoard.buttonPressed = 7;
			}
			if(event.getSource() == button8){
				DrawBoard.buttonPressed = 8;
			}
		
		}
	}
	
	
	//main
	public static void main(String[] args) {
		Drawer appDrawTool = new Drawer();
		appDrawTool.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

	}

}