score.java

J2ME超级坦克大战源码

import javax.microedition.lcdui.*;
import javax.microedition.lcdui.game.*;


public final class Score extends Sprite implements Actor{
    
    /**
     * score 100
     */
    public final static int SCORE_100 =0;
    
    /**
     * score 200
     */
    public final static int SCORE_200 =1;
    
    /**
     * score 300
     */
    public final static int SCORE_300 =2;
    
    /**
     * score 400
     */
    public final static int SCORE_400 =3;
    
    /**
     * score 500
     */
    public final static int SCORE_500 =4;
    
    /**
     * the score value.
     */
    private int scoreValue=-1;
    
    /**
     * maximun number of score in the battle field.
     */
    private static final int POOL_SIZE = 10;
    
    /**
     * This pool store all scores.
     */
    private static Score SCORE_POOL[];
    
    /**
     * the start time of the displaying the score.
     */
    private long startTime=0;
    /**
     * the score live time, default 1 second
     */
    private static long livePeriod=1000;
    
    /**
     * Tank should know about the battle field.
     */
    private static BattleField battleField;
    
    /**
     * Tank should know about the layer manager.
     */
    private static LayerManager layerManager;
    
    /**
     * initial the score pool.
     */
    static {
        SCORE_POOL = new Score[POOL_SIZE];
        for(int i=0;i<POOL_SIZE;i++){
            SCORE_POOL[i]=new Score();
            SCORE_POOL[i].setVisible(false);
        }

    }

    
    public void setValue(int value){
        this.scoreValue=value;
        setFrame(value);
    }
    
    
    public int getValue(){
        return this.scoreValue;
    }
    
    
    private Score() {
        super(ResourceManager.getInstance().getImage(ResourceManager.SCORE),
                ResourceManager.getInstance().
                    getImage(ResourceManager.SCORE).getWidth()/5,
                ResourceManager.getInstance().
                    getImage(ResourceManager.SCORE).getHeight());
    }
    
    
    
    public void tick(){
        if(isVisible()){
            long tickTime = System.currentTimeMillis();
            if(startTime>0){
                if(tickTime-startTime>livePeriod){
                    setVisible(false);
                    startTime=0;
                    return;
                }
            }
        }
    }
    
    
    public static Score show(int x, int y,int value) {
        for (int i = 0; i < POOL_SIZE; ++i) {
            Score score = SCORE_POOL[i];
            if (!score.isVisible()) {
                score.startTime=System.currentTimeMillis();
                score.setRefPixelPosition(x, y);
                score.setValue(value);
                score.setVisible(true);
                return score;
            }
        }
        return null;
    }
    
    
    public static void setLayerManager(LayerManager manager) {
        layerManager = manager;
        if (layerManager != null){
            
            for (int i = 0; i < POOL_SIZE; i++)
                layerManager.append(SCORE_POOL[i]);
        }
    }
   
    public static void setBattleField(BattleField field) {
        battleField = field;
    }
    
}