图象生成器

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JPG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JPG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(); } }