J2ME中圖片隨按鍵移動和旋轉代碼實戰

主要方法：Image.createImage(img,x, y,width,height,rotation);
參數：img,靶心圖表片
        x,y,width,height指的是靶心圖表片img的部分地區
        rotation是旋轉的角度
/**
 * @作者 Jcuckoo
 * @建立日期 2008-11-25
 * @版本 V 1.0
 */
public class ImageCanvas extends Canvas {
 //圖片座標
 private int x=20;
 private int y=30;
 //圖片旋轉角度
 private int rotation=Sprite.TRANS_NONE;
 private Image img;
 private Image img1;
 public ImageCanvas() {
  try {
   img=Image.createImage("/test.png");
  } catch (IOException e) {
   img=null;
  }
 }
 protected void paint(Graphics g) {
  img1=Image.createImage(img, 0, 0,img.getWidth(),img.getHeight(),rotation);
  //重畫畫布
  g.setColor(255,255,255);
  g.fillRect(0, 0, getWidth(), getHeight());
  //繪製圖片
  g.drawImage(img, 0, 0, 0);
  g.drawImage(img1, x, y, 0);
 }
 protected void keyPressed(int keyCode) {
  int gamecode=getGameAction(keyCode);
  switch(gamecode){
   case Canvas.UP:
    y=y-3;
    if(y<0)y=0;
    break;
   case LEFT :
    x=x-3;
    if(x<0)x=0;
    break;
   case RIGHT:
    x=x+3;
    if(x>getWidth()-img.getWidth())x=getWidth()-img.getWidth();
    break;
   case DOWN:
    y=y+3;
    if(y>getHeight()-img.getHeight())y=getHeight()-img.getHeight();
    break;
   case GAME_A:
    rotation=Sprite.TRANS_ROT90;
    break;
   case GAME_B:
    rotation=Sprite.TRANS_ROT180;
    break;
   case GAME_C:
    rotation=Sprite.TRANS_ROT270;
    break;
   case GAME_D:
    rotation=Sprite.TRANS_NONE;
    break;
  }
  repaint();
 }
 protected void keyReleased(int keyCode) {
 }
 protected void keyRepeated(int keyCode) {
  int gamecode=getGameAction(keyCode);
  switch(gamecode){
   case Canvas.UP:
    y=y-3;
    if(y<0)y=0;
    break;
   case LEFT :
    x=x-3;
    if(x<0)x=0;
    break;
   case RIGHT:
    x=x+3;
    if(x>getWidth()-img.getWidth())x=getWidth()-img.getWidth();
    break;
   case DOWN:
    y=y+3;
    if(y>getHeight()-img.getHeight())y=getHeight()-img.getHeight();
    break;
  }
  repaint();
 }
}