plane.java

j2me 小的子弹精灵,简单介绍sprite 的一个例子

package spriteplane;

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

public class Plane {
  public static int MOVE = 4;
  public Sprite plane;
  private Graphics g = null;
  int scnX, scnY;
  int frameX, frameY;
  int x, y;
  boolean b = true;
  Image img;
  public Plane(Graphics g, int width, int height, int frameWidth,
               int frameHeight) {
    scnX = width;
    scnY = height;
    if (width > height) {
      x = y = height / 2;
    }
    else {
      x = y = width / 2;
    }
    this.g = g;
    img = null;
    this.frameX = frameWidth;
    this.frameY = frameHeight;
    try {
      img = Image.createImage("/res/planes.png");
    }
    catch (Exception e) {
      System.out.println("io error");
    }
    plane = new Sprite(img, frameWidth, frameHeight);
  }

  public void DrawSelf() {
    if (b == true) {
      plane.setPosition(x,y);
      plane.paint(g);
      //  bullet.paint(g);//
      b = false;
    }
    else {
      plane.paint(g);
    }
  }

  public void moveLeft() {
    getXY();
    if (x - MOVE > 0) {
      plane.move(MOVE * -1, 0);
    }
  }

  public void moveRight() {
    getXY();
    if ( (x + MOVE + frameX) < scnX) {
      plane.move(MOVE, 0);
    }
  }

  public void moveNS() {
    getXY();
    if ( (x - MOVE) > 0) {
      plane.move(MOVE * -1, MOVE * -1);
    }

  }

  public void moveUp() {
    getXY();
    if (y - MOVE > 0) {
      plane.move(0, MOVE * -1);
    }
  }

  public void moveDown() {
    getXY();
    if (y + MOVE + frameY < scnY) {
      plane.move(0, MOVE);
    }
  }

  public void getXY() {
    x = plane.getX();
    y = plane.getY();
  }
}