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          圖像顯示
          

          1 使用Graphics.drawImage(Image img, int x, int y, ImageObserver observer)
          
方法顯示圖像。
          


          
2 使用Component.getToolkit.getImage(String path)語句獲得Image實(shí)例對象。
          

          例：
          
package drawimage;
          

          import java.awt.Frame;
          
import java.awt.Graphics;
          
import java.awt.Image;
          
import java.awt.event.WindowAdapter;
          
import java.awt.event.WindowEvent;
          

          public class DrawImage extends Frame 
          
{
          
    private static final long serialVersionUID = 1L;
          
 
          
    public DrawImage()
          
 {
          
   this.addWindowListener(new WindowAdapter() 
          
      {
          
       public void windowClosing(WindowEvent e) 
          
       {
          
        dispose();
          
        System.exit(0);
          
       }
          
    
          
       });
          
 }
          
 public static void main(String[] args) 
          
 {
          
  System.out.println("Starting DrawImage.");
          
  DrawImage mainFrame = new DrawImage();
          
  Image img = mainFrame.getToolkit().getImage("love.jpg");
          
  
          
  mainFrame.setSize(400,400);
          
  mainFrame.setTitle("DrawImage");
          
  mainFrame.setVisible(true);
          
  Graphics g = mainFrame.getGraphics();
          
  while(!g.drawImage(img,150,150,mainFrame));
          
  
          
 
          

           }
          

          }
          

           
          

          圖像重畫
          


          
package drawimage;
          

          import java.awt.Frame;
          
import java.awt.Graphics;
          
import java.awt.Image;
          
import java.awt.event.WindowAdapter;
          
import java.awt.event.WindowEvent;
          

          public class DrawImage extends Frame 
          
{
          
 Image img = getToolkit().getImage("love.jpg");
          
    private static final long serialVersionUID = 1L;
          
 public void paint(Graphics g)
          
 {
          
  g.drawImage(img,0,0,this);
          
 }
          
    public DrawImage()
          
 {
          
   this.addWindowListener(new WindowAdapter() 
          
      {
          
       public void windowClosing(WindowEvent e) 
          
       {
          
        dispose();
          
        System.exit(0);
          
       }
          
    
          
       });
          
 }
          
 public static void main(String[] args) 
          
 {
          
  System.out.println("Starting DrawImage.");
          
  DrawImage mainFrame = new DrawImage();
          
  
          
  mainFrame.setSize(400,400);
          
  mainFrame.setTitle("DrawImage");
          
  mainFrame.setVisible(true);
          
  /*Graphics g = mainFrame.getGraphics();
          
  while(!g.drawImage(img,150,150,mainFrame));
          
  */
          
 
          

           }
          

          }
          

           
          

           
          

           
          

           
          

           
          

           
          

           
          


          
雙緩沖技術(shù)：
          

          1  Component.createImage方法創(chuàng)建內(nèi)存Image對象
          
2  在Image對象上進(jìn)行繪制的結(jié)果就成了一幅圖像
          
3  在Image對象上執(zhí)行與組件表面同樣的繪制，Image
          
     對象中的圖像就是組件表面內(nèi)容的復(fù)制，當(dāng)組件重畫    時，只需要將內(nèi)存中的Image對象在組件上畫出；
          

          package drawline;
          

          import java.awt.Color;
          
import java.awt.Dimension;
          
import java.awt.Font;
          
import java.awt.Frame;
          
import java.awt.Graphics;
          
import java.awt.Image;
          
import java.awt.event.MouseAdapter;
          
import java.awt.event.MouseEvent;
          
import java.awt.event.WindowAdapter;
          
import java.awt.event.WindowEvent;
          
//import java.util.Enumeration;
          
import java.util.Vector;
          


          
public class DrawLine1 extends Frame 
          
{
          
 int orgX;
          
 int orgY;
          
 int endX;
          
 int endY;
          
 Image oimg = null;
          
 Graphics og = null;
          
 Vector<MyLine> vLines = new Vector<MyLine>();
          
 
          
 public void paint(Graphics g)
          
 {
          
  if(oimg != null)
          
  {
          
    g.drawImage(oimg,0,0,this);
          
  }
          
  /*g.setColor(Color.RED);
          
  g.setFont(new Font(null,Font.ITALIC|Font.BOLD,30));
          
  Enumeration<MyLine> e = vLines.elements();
          
  while(e.hasMoreElements())
          
  {
          
   MyLine line = (MyLine)e.nextElement();
          
      line.drawMe(g);
          
  }*/
          
  //g.drawLine(orgX, orgY, endX, endY);
          
 }
          
 private static final long serialVersionUID = 9004940250333651314L;
          

           public DrawLine1() 
          
 {
          
  setSize(400,400);
          
  setTitle("Drawline");
          
  setVisible(true);
          
  
          
  Dimension d = getSize();
          
  oimg = createImage(d.width,d.height);
          
  og = oimg.getGraphics();
          
  
          
     addWindowListener(new WindowAdapter() 
          
     {
          
      public void windowClosing(WindowEvent e) {
          
       dispose();
          
       System.exit(0);
          
      }
          
   
          
     });
          
  
          
  this.addMouseListener(new MouseAdapter()
          
  {
          
      
          
      
          
      public void mousePressed(MouseEvent e)
          
      {
          
       orgX = e.getX();
          
       orgY = e.getY();
          
       
          
      }
          
      public void mouseReleased(MouseEvent e)
          
      {
          
       endX = e.getX();
          
       endY = e.getY();
          
       Graphics g = getGraphics();
          
       g.setColor(Color.RED);
          
       g.setFont(new Font(null,Font.ITALIC|Font.BOLD,30));
          
       g.drawString(orgX + "," + orgY,orgX,orgY);
          
       g.drawString(e.getX() + "," + e.getY(), e.getX(),e.getY());
          
       g.drawLine(orgX, orgY, e.getX(),e.getY());
          
       
          
       og.setColor(Color.RED);
          
       og.setFont(new Font(null,Font.ITALIC|Font.BOLD,30));
          
       og.drawString(orgX + "," + orgY,orgX,orgY);
          
       og.drawString(e.getX() + "," + e.getY(), e.getX(),e.getY());
          
       og.drawLine(orgX, orgY, e.getX(),e.getY());
          
       /*vLines.add(new MyLine(orgX,orgY,endX,endY));
          
       repaint();*/
          
      }//為什么用getGraphics().setColor(Color.RED)是不用導(dǎo)java.awt.Graphics包
          
      //Enumeration<MyLine>???????????????????????????
          
      
          
      
          
     });
          
 }
          

           public static void main( String[] args) {
          
  System.out.println("String DrawLine");
          
   new DrawLine1();
          
  
          
  
          
  
          
 }
          
}
          

          //構(gòu)建主框架對象時是先調(diào)用paint（）還是構(gòu)造函數(shù)
          

           
          
 
			
          posted @ 2008-08-10 21:37 lanxin1020 閱讀(183) | 評論 (0) | 編輯 收藏
          
		
			
          
		
			
			
           Graphics類與圖形繪制
          
Componentp.getGraphics方法與Grahpics類
          

          Graphics.drawLine(int x1,int y1,int x2, int y2)方法；
          
Graphics.drawStringString str，int x，int y）方法；
          
Graphics.drawSting方法的坐標(biāo)參數(shù)是以坐下方為參考點(diǎn)的；
          


          
例：
          

          package drawline;
          

          import java.awt.Color;
          
import java.awt.Font;
          
import java.awt.Frame;
          
import java.awt.Graphics;
          
import java.awt.event.MouseAdapter;
          
import java.awt.event.MouseEvent;
          
import java.awt.event.WindowAdapter;
          
import java.awt.event.WindowEvent;
          


          
public class DrawLine extends Frame {
          

           private static final long serialVersionUID = 9004940250333651314L;
          

           public DrawLine() 
          
 {
          
  this.addWindowListener(new WindowAdapter() 
          
     {
          
      public void windowClosing(WindowEvent e) {
          
       dispose();
          
       System.exit(0);
          
      }
          
   
          
     });
          
  
          
  this.addMouseListener(new MouseAdapter()
          
     {
          
      
          
      int orgX;
          
      int orgY;
          
      public void mousePressed(MouseEvent e)
          
      {
          
       orgX = e.getX();
          
       orgY = e.getY();
          
       
          
      }
          
      public void mouseReleased(MouseEvent e)
          
      {
          
       Graphics g = getGraphics();
          
       g.setColor(Color.RED);
          
       g.setFont(new Font(null,Font.ITALIC|Font.BOLD,30));
          
       g.drawString(orgX + "," + orgY,orgX,orgY);
          
       g.drawString(e.getX() + "," + e.getY(), e.getX(),e.getY());
          
       g.drawLine(orgX, orgY, e.getX(),e.getY());
          
       
          
      }//為什么用getGraphics().setColor(Color.RED)是不用導(dǎo)java.awt.Graphics包
          
      
          
      
          
     });
          
 }
          

           public static void main( String[] args) {
          
  System.out.println("String DrawLine");
          
  DrawLine mainFrame = new DrawLine();
          
  mainFrame.setSize(400,400);
          
  mainFrame.setTitle("Drawline");
          
  mainFrame.setVisible(true);
          
  
          
  
          
 }
          
}
          

          組件重建的處理：
          

          1 組件重繪的原理  曝光
          
2 paint(Graphics g)的作用
          

          AWT組件重繪路線：
          
AWT Thread ->paint() ->AWT Thread
          
repaint()+AWT Thread ->update(清除組件表面內(nèi)容調(diào)用paint()方法）->paint();
          

          例：
          
package drawline;
          

          import java.awt.Color;
          
import java.awt.Font;
          
import java.awt.Frame;
          
import java.awt.Graphics;
          
import java.awt.event.MouseAdapter;
          
import java.awt.event.MouseEvent;
          
import java.awt.event.WindowAdapter;
          
import java.awt.event.WindowEvent;
          
import java.util.Enumeration;
          
import java.util.Vector;
          


          
public class DrawLine extends Frame 
          
{
          
 int orgX;
          
 int orgY;
          
 int endX;
          
 int endY;
          
 Vector<MyLine> vLines = new Vector<MyLine>();
          
 
          
 public void paint(Graphics g)
          
 {
          
  g.setColor(Color.RED);
          
  g.setFont(new Font(null,Font.ITALIC|Font.BOLD,30));
          
  Enumeration<MyLine> e = vLines.elements();
          
  while(e.hasMoreElements())
          
  {
          
   MyLine line = (MyLine)e.nextElement();
          
  line.drawMe(g);
          
  }
          
  //g.drawLine(orgX, orgY, endX, endY);
          
 }
          
 private static final long serialVersionUID = 9004940250333651314L;
          

           public DrawLine() 
          
 {
          
  
          
  this.addWindowListener(new WindowAdapter() 
          
     {
          
      public void windowClosing(WindowEvent e) {
          
       dispose();
          
       System.exit(0);
          
      }
          
   
          
     });
          
  
          
  this.addMouseListener(new MouseAdapter()
          
     {
          
      
          
      
          
      public void mousePressed(MouseEvent e)
          
      {
          
       orgX = e.getX();
          
       orgY = e.getY();
          
       
          
      }
          
      public void mouseReleased(MouseEvent e)
          
      {
          
       endX = e.getX();
          
       endY = e.getY();
          
       /*Graphics g = getGraphics();
          
       g.setColor(Color.RED);
          
       g.setFont(new Font(null,Font.ITALIC|Font.BOLD,30));
          
       g.drawString(orgX + "," + orgY,orgX,orgY);
          
       g.drawString(e.getX() + "," + e.getY(), e.getX(),e.getY());
          
       g.drawLine(orgX, orgY, e.getX(),e.getY());
          
       */
          
       vLines.add(new MyLine(orgX,orgY,endX,endY));
          
       repaint();
          
      }//為什么用getGraphics().setColor(Color.RED)是不用導(dǎo)java.awt.Graphics包
          
      //Enumeration<MyLine>???????????????????????????
          
      
          
      
          
     });
          
 }
          

           public static void main( String[] args) {
          
  System.out.println("String DrawLine");
          
  DrawLine mainFrame = new DrawLine();
          
  mainFrame.setSize(400,400);
          
  mainFrame.setTitle("Drawline");
          
  mainFrame.setVisible(true);
          
  
          
  
          
 }
          
}
          


          
package drawline;
          

          import java.awt.Graphics;
          


          
public class MyLine 
          
{
          
 private int orgX;
          
 private int orgY;
          
 private int endX;
          
 private int endY;
          
 public MyLine(int orgX, int orgY, int endX, int endY)
          
 {
          
  this.orgX = orgX;
          
  this.orgY = orgY;
          
  this.endX = endX;
          
  this.endY = endY;
          
 }
          
 
          
 
          
 public void drawMe(Graphics g)
          
 {
          
  System.out.println(orgX + "," + orgY + " "+endX + "," + endY);
          
  g.drawString(orgX + "," + orgY,orgX,orgY);
          
  g.drawString(endX + "," + endY,endX,endY);
          
  g.drawLine(orgX, orgY, endX, endY);
          
 }
          
 
          
 
          

          }
          

          
   
			
          posted @ 2008-08-10 07:51 lanxin1020 閱讀(271) | 評論 (0) | 編輯 收藏
          
		
			
          
		
			
			初學(xué)警示：
          

          

          
面向?qū)ο缶幊趟枷耄?br />
編程人員腦海里面想的問題應(yīng)該是：程序運(yùn)行時的各個時刻的各個對象的內(nèi)存布局和變化狀態(tài)，以及每行代碼執(zhí)行后對這些對象產(chǎn)生的影響。而非頂住程序中靜止不變的代碼，孤立的琢磨每條語句的語法是否正確。
 
			
          posted @ 2008-08-07 15:53 lanxin1020 閱讀(160) | 評論 (0) | 編輯 收藏
          
		
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