tranimagecanvas.java~26~

在j2me当中缩放图片

import javax.microedition.lcdui.*;

/**
 * <p>Title: </p>
 * <p>Description: </p>
 * <p>Copyright: Copyright (c) 2006</p>
 * <p>Company: </p>
 * @author not attributable
 * @version 1.0
 */

public class TranImageCanvas extends Canvas implements Runnable{
  int game_status = -1;

  boolean gameRun;
  Image img_png;
  Image img_buffer;
  Display display;

  public TranImageCanvas(Display display){
    try {
      this.display = display;
      System.out.println("111");
      game_status = 0;
      System.out.println("222");
      img_png = Image.createImage("/res/1.png");
      img_buffer = scaleImage(img_png,2,1);
      System.out.println("333");
      gameRun = true;
      System.out.println("444");
      new Thread(this).start();
      System.out.println("555");
    }
    catch (Exception ex) {
      ex.printStackTrace();
    }
  }

  public Image scaleImage(Image src,int scales1,int scales2)
  {
   return transImage(src,src.getWidth()*scales1/scales2,src.getHeight()*scales1/scales2);
  }
  public Image transImage(Image src, int w, int h)
  {
     int srcW = src.getWidth();
     int srcH = src.getHeight();
     int dstW=w,dstH=h;
     Image tmp = Image.createImage(dstW, srcH);
     Graphics g = tmp.getGraphics();
     int scale=16;
   int delta = (srcW << scale) / dstW;//扫描长度
     int pos = delta / 2;//扫描位置
     for (int x = 0; x < dstW; x++)
     {
       g.setClip(x, 0, 1, srcH);
       g.drawImage(src, x - (pos >> scale), 0, Graphics.LEFT | Graphics.TOP);
       pos += delta;
     }
     Image dst = Image.createImage( dstW, dstH);
     g = dst.getGraphics();
     delta = (srcH << scale) / dstH;
     pos = delta / 2;
     for (int y = 0; y < dstH; y++)
     {
       g.setClip(0,y, dstW, 1);
       g.drawImage(tmp, 0, y - (pos >> scale), Graphics.LEFT | Graphics.TOP);
       pos += delta;
     }
     return dst;
  }

  public void keyPressed(int keycode)
  {
    if (keycode == -6)
    {
      //handleSoft1();
    }
    else if (keycode == -7)
    {
      //handleSoft2();
    }
    else if (keycode == -5) // function should be same as soft1
    {
      //handleSelect();
    }
    else if (keycode == -1 || keycode == 50)
    {
     // handleUp();
    }
    else if (keycode == -2 || keycode == 56)
    {
      //handleDown();
    }
    else if (keycode == -3 || keycode == 52)
    {
     // handleLeft();
    }
    else if (keycode == -4 || keycode == 54)
    {
      //handleRight();
    }else if(keycode == 51){
    //  handleKey3();
    }else if(keycode == 49){
    //  handleKey1();
    }
  }

  protected void paint(Graphics g) {
    /**@todo Implement this javax.microedition.lcdui.Canvas abstract method*/
    g.setColor(0);
    g.fillRect(0,0,176,220);
    if(game_status == 0)
    g.drawImage(img_buffer,0,0,0);
  }
  public void run()
  {
    try
    {
      while (gameRun)
      {
        if(game_status == 0){
          Thread.sleep(100);
        }
        //Thread.sleep(100);
        repaint();
      }
    }
    catch (Exception ex)
    {
    }
  }

}