bullet.java

来自「j2me的坦克大战 元代码 单机版和蓝牙联网版」· Java 代码 · 共 76 行

/*
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 * and open the template in the editor.
 */
import javax.microedition.lcdui.Image;
import javax.microedition.lcdui.game.GameCanvas;
import javax.microedition.lcdui.game.Sprite;

/*
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 * and open the template in the editor.
 */
/**
 *
 * @author wutianyi
 */
public class Bullet extends Sprite {

    private int Direction = -1;
    private int step = 5;
    public boolean isLive = true;
    private int width,  height;

    public Bullet(Image img) {
        super(img);
    }

    public void setDirection(int Direction) {
        this.Direction = Direction;
        if (Direction == GameCanvas.LEFT_PRESSED) {
            setTransform(Sprite.TRANS_NONE);
        }
        if (Direction == GameCanvas.RIGHT_PRESSED) {
            setTransform(Sprite.TRANS_ROT180);
        }
        if (Direction == GameCanvas.UP_PRESSED) {
            setTransform(Sprite.TRANS_ROT90);
        }
        if (Direction == GameCanvas.DOWN_PRESSED) {
            setTransform(Sprite.TRANS_ROT270);
        }
    }

    public void setCanvasSize(int width, int height) {
        this.width = width;
        this.height = height;
    }

    public void tick() {
        if (Direction == GameCanvas.LEFT_PRESSED) {
            move(-step, 0);
            if (getX() <= 0) {
                isLive = false;
            }
        }
        if (Direction == GameCanvas.RIGHT_PRESSED) {
            move(step, 0);
            if (getX() >= width) {
                isLive = false;
            }
        }
        if (Direction == GameCanvas.UP_PRESSED) {
            move(0, -step);
            if (getY() <= 0) {
                isLive = false;
            }
        }
        if (Direction == GameCanvas.DOWN_PRESSED) {
            move(0, step);
            if (getY() >= height) {
                isLive = false;
            }
        }
    }
}