makejpeg.java

此资源是JAJA语言开发的彩色画图本

import java.awt.*;
import java.util.*;
import java.awt.geom.*;
import java.awt.image.*;
import java.awt.event.*;
import java.io.*;
import javax.swing.*;
import com.sun.image.codec.jpeg.*;
class Point
{int x,y;
Point(int x,int y) 
{this.x=x;this.y=y;
}
} 
public class MakeJPEG extends Canvas implements 
MouseMotionListener,MouseListener,ActionListener 
{ 
int x=-1,y=-1,橡皮擦通知=0,清除通知=0;
Vector v=null;int n=1; 
Graphics2D  ggg ;
BufferedImage image;
Frame window;
Button 保存,调色板,橡皮,清除,画笔,获取屏幕,绘制图形;
Color 画笔颜色; 
Panel pCenter,pSouth,pNorth;
public MakeJPEG() 
{ 
保存=new Button("将绘制的图形或屏幕保存为JPEG 文件"); 
获取屏幕=new Button("获取屏幕");
绘制图形=new Button("绘制图形");
调色板=new Button("打开调色板");
画笔=new Button("画笔");
橡皮=new Button("橡皮");
清除=new Button("清除");
调色板.addActionListener(this);
绘制图形.addActionListener(this);
保存.addActionListener(this);
画笔.addActionListener(this);
橡皮.addActionListener(this);
清除.addActionListener(this);
获取屏幕.addActionListener(this);
画笔颜色=new Color(0,0,0);
addMouseMotionListener(this);
addMouseListener(this);
v=new Vector();
setBackground(Color.white);
image=new BufferedImage(200,200,BufferedImage.TYPE_INT_RGB);
ggg=image.createGraphics();
Rectangle2D rect=new Rectangle2D.Double(0,0,200,200);
ggg.setColor(getBackground());
ggg.fill(rect);
window=new Frame("JPEG图像生成器");
pCenter=new Panel();
pCenter.setLayout(null);
pCenter.add(this);
pCenter.setBackground(Color.gray);
this.setBounds(80,30,210,210);
window.add(pCenter,BorderLayout.CENTER);
pNorth=new Panel();
pNorth.add(保存);
pNorth.add(绘制图形);
pNorth.add(获取屏幕);
window.add(pNorth,BorderLayout.NORTH);
pSouth=new Panel();
pSouth.add(调色板);
pSouth.add(橡皮);
pSouth.add(清除);
pSouth.add(画笔);
window.add(pSouth,BorderLayout.SOUTH);
window.setVisible(true);
window.addWindowListener(new WindowAdapter() 
{ 
public void windowClosing(WindowEvent e) 
{ 
System.exit(0);
} 
}); 
window.setBounds(100,80,390,380);
window.validate();
} 
public void paint(Graphics g) 
{
if(x!=-1&&y!=-1&&橡皮擦通知==0&&清除通知==0) 
{ 
g.setColor(画笔颜色);
n=v.size();
for(int i=0;i<n-1;i++) 
{ 
Point p1=(Point)v.elementAt(i);
Point p2=(Point)v.elementAt(i+1);
g.drawLine(p1.x,p1.y,p2.x,p2.y);
ggg.setColor(g.getColor());
ggg.drawLine(p1.x,p1.y,p2.x,p2.y);
} 
}
else if(橡皮擦通知==1&&清除通知==0) 
{ 
g.setColor(getBackground());
g.fillRect(x-2,y-2,4,4);
ggg.setColor(getBackground());
ggg.fillRect(x-2,y-2,4,4);
} 
else if(清除通知==1&&橡皮擦通知==0) 
{ 
g.setColor(getBackground());
g.fillRect(0,0,200,200);
ggg.setColor(getBackground());
ggg.fillRect(0,0,200,200);
}
g.drawImage(image,0,0,200,200,this);
}
public void mouseDragged(MouseEvent e) 
{ 
x=(int)e.getX();
y=(int)e.getY();
Point p=new Point(x,y);
v.addElement(p);
repaint();
} 
public void mouseMoved(MouseEvent e) 
{}
public void mousePressed(MouseEvent e) 
{}
public void mouseReleased(MouseEvent e) 
{

v.removeAllElements();
}
public void mouseEntered(MouseEvent e){} 
public void mouseExited(MouseEvent e){} 
public void mouseClicked(MouseEvent e){} 
public void update(Graphics g) 
{ 
{ 
paint(g); 
} 
} 
public void actionPerformed(ActionEvent e) 
{ 
if(e.getSource()==橡皮) 
{ 
橡皮擦通知=1;
清除通知=0;
} 
else if(e.getSource()==清除) 
{ 
清除通知=1;
橡皮擦通知=0;
repaint();
} 
else if(e.getSource()==画笔) 
{ 
橡皮擦通知=0;
清除通知=0;
} 
else if(e.getSource()==保存) 
{ 
FileDialog  savedialog=new FileDialog(window," 保存图型到JPEG格式 ",FileDialog.SAVE);
savedialog.setVisible(true);
if(savedialog.getFile()!=null) 
{ 
try{ 
String fileName=savedialog.getFile();
FileOutputStream out=new FileOutputStream(fileName);
JPEGImageEncoder encoder=JPEGCodec.createJPEGEncoder(out);
JPEGEncodeParam 
param=encoder.getDefaultJPEGEncodeParam(image);
param.setQuality(1.0f,false);
encoder.setJPEGEncodeParam(param);
encoder.encode(image);
out.close();
} 
catch(Exception EE) 
{ 
} 
} 
} 
else if(e.getSource()==获取屏幕) 
{ 
Robot robot=null;
try{ 
robot=new Robot();
} 
catch(Exception er) 
{ 
} 
Rectangle screenRect=null;
int width=getToolkit().getScreenSize().width;
int height=getToolkit().getScreenSize().height;
screenRect=new Rectangle(0,0,width,height);
window.setVisible(false);
this.window.setVisible(false);
image=robot.createScreenCapture(screenRect);
window.setVisible(true);
repaint();
} 
else if(e.getSource()==调色板) 
{ 
Color tempColor=JColorChooser.showDialog(window,"调色板",画笔颜色);
{ 
if(tempColor!=null) 
{ 
画笔颜色=tempColor;
画笔.setForeground(画笔颜色);
} 
} 
} 
else if(e.getSource()==绘制图形) 
{ 
window.dispose();
this.window.dispose();
MakeJPEG canvas=new MakeJPEG();
} 
}
public static void main(String args[]) 
{ 
new MakeJPEG();
} 
}