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    隨筆 - 63 
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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：
    

    1  Component.createImage方法創建內存Image對象
    
2  在Image對象上進行繪制的結果就成了一幅圖像
    
3  在Image對象上執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容的復制，當組件重畫    時，只需要將內存中的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java.awt.Graphics包
    
      //Enumeration<MyLine>???????????????????????????
    
      
    
      
    
     });
    
 }
    

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

    //構建主框架對象時是先調用paint（）還是構造函數
    

     
    
 
			
    posted @ 2008-08-10 21:37 lanxin1020 閱讀(178) | 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方法的坐標參數是以坐下方為參考點的；
    


    
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(清除組件表面內容調用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(266) | 評論 (0) | 編輯 收藏
    
		
			
    
		
			
			初學警示：
    

    

    
面向對象編程思想：
    
編程人員腦海里面想的問題應該是：程序運行時的各個時刻的各個對象的內存布局和變化狀態，以及每行代碼執行后對這些對象產生的影響。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(157) | 評論 (0) | 編輯 收藏
    
		
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