www.pudn.com > javahuabanchengxu.rar > javahuabanchengxu.java
package MiniDrawPad;
import java.awt.*;
import java.awt.geom.*;
import java.awt.event.*;
import javax.swing.*;
import java.io.*;
import java.util.*;
public class MiniDrawPad extends JFrame //主类，扩展了JFrame类，用来生成主界面
{
private ObjectInputStream input;
private ObjectOutputStream output; //定义输入输出流，用来调用和保存图像文件
private JButton choices[]; //按钮数组，存放以下名称的功能按钮
private String names[]={
"New",
"Open",
"Save", //这三个是基本操作按钮，包括"新建"、"打开"、"保存"
/*接下来是我们的画图板上面有的基本的几个绘图单元按钮*/
"Pencil", //铅笔画，也就是用鼠标拖动着随意绘图
"Line", //绘制直线
"Rect", //绘制空心矩形
"fRect", //绘制以指定颜色填充的实心矩形
"Oval", //绘制空心椭圆
"fOval", //绘制以指定颜色填充的实心椭圆
"Circle", //绘制圆形
"fCircle", //绘制以指定颜色填充的实心圆形
"RoundRect", //绘制空心圆角矩形
"frRect", //绘制以指定颜色填充的实心圆角矩形
"Rubber", //橡皮擦，可用来擦去已经绘制好的图案
"Color", //选择颜色按钮，可用来选择需要的颜色
"Stroke", //选择线条粗细的按钮，输入需要的数值可以实现绘图线条粗细的变化
"Word" //输入文字按钮，可以在绘图板上实现文字输入
};
private String styleNames[]={
" 宋体 " , " 隶书 " , " 华文彩云 " , " 仿宋_GB2312 " , " 华文行楷 " ,
" 方正舒体 " , " Times New Roman " , " Serif " , " Monospaced " ,
" SonsSerif " , " Garamond "
}; //可供选择的字体项
//当然这里的灵活的结构可以让读者自己随意添加系统支持的字体
private Icon items[];
private String tipText[]={
//这里是鼠标移动到相应按钮上面上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着理解
"Draw a new picture",
"Open a saved picture",
"Save current drawing",
"Draw at will",
"Draw a straight line",
"Draw a rectangle",
"Fill a ractangle",
"Draw an oval",
"Fill an oval",
"Draw a circle",
"Fill a circle",
"Draw a round rectangle",
"Fill a round rectangle",
"Erase at will",
"Choose current drawing color",
"Set current drawing stroke",
"Write down what u want"
};
JToolBar buttonPanel ; //定义按钮面板
private JLabel statusBar; //显示鼠标状态的提示条
private DrawPanel drawingArea; //画图区域
private int width=800,height=550; //定义画图区域初始大小
drawings[] itemList=new drawings[5000]; //用来存放基本图形的数组
private int currentChoice=3; //设置默认画图状态为随笔画
int index=0; //当前已经绘制的图形数目
private Color color=Color.black; //当前画笔颜色
int R,G,B; //用来存放当前色彩值
int f1,f2; //用来存放当前字体风格
String style1; //用来存放当前字体
private float stroke=1.0f; //设置画笔粗细，默认值为1.0f
JCheckBox bold,italic; //定义字体风格选择框
//bold为粗体，italic为斜体，二者可以同时使用
JComboBox styles;
public MiniDrawPad() //构造函数
{
super("Drawing Pad");
JMenuBar bar=new JMenuBar(); //定义菜单条
JMenu fileMenu=new JMenu("File");
fileMenu.setMnemonic('F');
//新建文件菜单条
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
}
}
);
fileMenu.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
}
}
);
fileMenu.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
}
}
);
fileMenu.add(loadItem);
fileMenu.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); //如果被触发，则退出画图板程序
}
}
);
fileMenu.add(exitItem);
bar.add(fileMenu);
//设置颜色菜单条
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);
//设置线条粗细菜单条
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(){
public void actionPerformed(ActionEvent e)
{
setStroke();
}
}
);
strokeMenu.add(strokeItem);
bar.add(strokeMenu);
//设置提示菜单条
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(){
public void actionPerformed(ActionEvent e)
{
JOptionPane.showMessageDialog(null,
"This is a mini drawing pad!\nCopyright (c) 2002 Tsinghua 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();
choices=new JButton[names.length];
buttonPanel = new JToolBar( JToolBar.VERTICAL ) ;
buttonPanel = new JToolBar( JToolBar.HORIZONTAL) ;
ButtonHandler handler=new ButtonHandler();
ButtonHandler1 handler1=new ButtonHandler1();
//导入我们需要的图形图标，这些图标都存放在与源文件相同的目录下面
for(int i=0;i0 )");
stroke=Float.parseFloat(input);
itemList[index].stroke=stroke;
}
//保存图形文件程序段
public void saveFile()
{
JFileChooser fileChooser=new JFileChooser();
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);
drawings record;
output.writeInt( index );
for(int i=0;i< index ;i++)
{
drawings p= itemList[ i ] ;
output.writeObject(p);
output.flush(); //将所有图形信息强制转换成父类线性化存储到文件中
}
output.close();
fos.close();
}
catch(IOException ioe)
{
ioe.printStackTrace();
}
}
}
//打开一个图形文件程序段
public void loadFile()
{
JFileChooser fileChooser=new JFileChooser();
fileChooser.setFileSelectionMode(JFileChooser.FILES_ONLY);
int result =fileChooser.showOpenDialog(this);
if(result==JFileChooser.CANCEL_OPTION)
return ;
File fileName=fileChooser.getSelectedFile();
fileName.canRead();
if (fileName==null||fileName.getName().equals(""))
JOptionPane.showMessageDialog(fileChooser,"Invalid File Name",
"Invalid File Name", JOptionPane.ERROR_MESSAGE);
else {
try {
FileInputStream fis=new FileInputStream(fileName);
input=new ObjectInputStream(fis);
drawings inputRecord;
int countNumber=0;
countNumber=input.readInt();
for(index=0;index< countNumber ;index++)
{
inputRecord=(drawings)input.readObject();
itemList[ index ] = inputRecord ;
}
createNewItem();
input.close();
repaint();
}
catch(EOFException endofFileException){
JOptionPane.showMessageDialog(this,"no more record in file",
"class not found",JOptionPane.ERROR_MESSAGE );
}
catch(ClassNotFoundException classNotFoundException){
JOptionPane.showMessageDialog(this,"Unable to Create Object",
"end of file",JOptionPane.ERROR_MESSAGE );
}
catch (IOException ioException){
JOptionPane.showMessageDialog(this,"error during read from file",
"read Error",JOptionPane.ERROR_MESSAGE );
}
}
}
//新建一个文件程序段
public void newFile()
{
index=0;
currentChoice=3;
color=Color.black;
stroke=1.0f;
createNewItem();
repaint();//将有关值设置为初始状态，并且重画
}
//主函数段
public static void main(String args[])
{try {
UIManager.setLookAndFeel( UIManager.getSystemLookAndFeelClassName());
}
catch ( Exception e ) {}//将界面设置为当前windows风格
MiniDrawPad newPad=new MiniDrawPad();
newPad.addWindowListener(
new WindowAdapter(){
public void windowClosing(WindowEvent e)
{System.exit(0);}});
}
}
//定义画图的基本图形单元
class drawings implements Serializable//父类，基本图形单元，用到串行化接口，保存时所用
{
int x1,y1,x2,y2; //定义坐标属性
int R,G,B; //定义色彩属性
float stroke; //定义线条粗细属性
int type; //定义字体属性
String s1;
String s2; //定义字体风格属性
void draw(Graphics2D g2d){};//定义绘图函数
}
/*******************************************************************************
下面是各种基本图形单元的子类，都继承自父类drawings，请仔细理解继承的概念
********************************************************************************/
class Line extends drawings //直线类
{
void draw(Graphics2D g2d)
{g2d.setPaint(new Color(R,G,B));
g2d.setStroke(new BasicStroke(stroke,
BasicStroke.CAP_ROUND,BasicStroke.JOIN_BEVEL));
g2d.drawLine(x1,y1,x2,y2);
}
}
class Rect extends drawings//矩形类
{
void draw(Graphics2D g2d)
{g2d.setPaint(new Color(R,G,B));
g2d.setStroke(new BasicStroke(stroke));
g2d.drawRect(Math.min(x1,x2),Math.min(y1,y2),
Math.abs(x1-x2),Math.abs(y1-y2));
}
}
class fillRect extends drawings//实心矩形类
{
void draw(Graphics2D g2d)
{g2d.setPaint(new Color(R,G,B));
g2d.setStroke(new BasicStroke(stroke));
g2d.fillRect(Math.min(x1,x2),Math.min(y1,y2),
Math.abs(x1-x2),Math.abs(y1-y2));
}
}
class Oval extends drawings//椭圆类
{
void draw(Graphics2D g2d)
{g2d.setPaint(new Color(R,G,B));
g2d.setStroke(new BasicStroke(stroke));
g2d.drawOval(Math.min(x1,x2),Math.min(y1,y2),
Math.abs(x1-x2),Math.abs(y1-y2));
}
}
class fillOval extends drawings//实心椭圆
{
void draw(Graphics2D g2d)
{g2d.setPaint(new Color(R,G,B));
g2d.setStroke(new BasicStroke(stroke));
g2d.fillOval(Math.min(x1,x2),Math.min(y1,y2),
Math.abs(x1-x2),Math.abs(y1-y2));
}
}
class Circle extends drawings//圆类
{
void draw(Graphics2D g2d)
{g2d.setPaint(new Color(R,G,B));
g2d.setStroke(new BasicStroke(stroke));
g2d.drawOval(Math.min(x1,x2),Math.min(y1,y2),
Math.max(Math.abs(x1-x2),Math.abs(y1-y2)),
Math.max(Math.abs(x1-x2),Math.abs(y1-y2))
);
}
}
class fillCircle extends drawings//实心圆
{
void draw(Graphics2D g2d)
{g2d.setPaint(new Color(R,G,B));
g2d.setStroke(new BasicStroke(stroke));
g2d.fillOval(Math.min(x1,x2),Math.min(y1,y2),
Math.max(Math.abs(x1-x2),Math.abs(y1-y2)),
Math.max(Math.abs(x1-x2),Math.abs(y1-y2))
);
}
}
class RoundRect extends drawings//圆角矩形类
{
void draw(Graphics2D g2d)
{g2d.setPaint(new Color(R,G,B));
g2d.setStroke(new BasicStroke(stroke));
g2d.drawRoundRect(Math.min(x1,x2),Math.min(y1,y2),
Math.abs(x1-x2),Math.abs(y1-y2),
50,35);
}
}
class fillRoundRect extends drawings//实心圆角矩形类
{
void draw(Graphics2D g2d)
{g2d.setPaint(new Color(R,G,B));
g2d.setStroke(new BasicStroke(stroke));
g2d.fillRoundRect(Math.min(x1,x2),Math.min(y1,y2),
Math.abs(x1-x2),Math.abs(y1-y2),
50,35);
}
}
class Pencil extends drawings//随笔画类
{
void draw(Graphics2D g2d)
{g2d.setPaint(new Color(R,G,B));
g2d.setStroke(new BasicStroke(stroke,
BasicStroke.CAP_ROUND,BasicStroke.JOIN_BEVEL));
g2d.drawLine(x1,y1,x2,y2);
}
}
class Rubber extends drawings//橡皮擦类
{
void draw(Graphics2D g2d)
{g2d.setPaint(new Color(255,255,255));
g2d.setStroke(new BasicStroke(stroke+4,
BasicStroke.CAP_ROUND,BasicStroke.JOIN_BEVEL));
g2d.drawLine(x1,y1,x2,y2);
}
}
class Word extends drawings//输入文字类
{
void draw(Graphics2D g2d)
{
g2d.setPaint(new Color(R,G,B));
g2d.setFont(new Font(s2,x2+y2,((int)stroke)*18));
if (s1!= null )
g2d.drawString(s1,x1,y1);
}
}