manbullets.java~28~

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package man;

import javax.microedition.lcdui.game.*;
import javax.microedition.lcdui.*;
import java.util.Random;

/**
 * 子弹操作类
 */

public class ManBullets {

  private ManGameCanvas manGC;
  private int[][] Locus;         // 子弹运动的坐标轨迹
  private Sprite Bullets;        // 子弹图象
  private Random rnd;            // 随机种子
  private int SWidth, SHeight;   // 设备屏幕的宽度与高度

  //--- 构造函数 ----------------------------------------------------------------
  public ManBullets(ManGameCanvas manGC, Image img, int SWidth, int SHeight) {
    this.manGC = manGC;
    Bullets = new Sprite(img, img.getWidth(), img.getHeight());
    Bullets.setFrame(0);

    Locus = new int[20][6];
    rnd = new Random();
    this.SWidth = SWidth;
    this.SHeight = SHeight;
  }

  //--- 初始化运行轨迹 -----------------------------------------------------------
  public void InitBulletsLocus() {
    for (int i = 0; i < Locus.length; i++) {
      InitBulletLocus(i);
    }
  }

  //--- 初始化运行轨迹随机数组 ----------------------------------------------------
  private void InitBulletLocus(int i) {
    Locus[i][0] = (rnd.nextInt() & 0x7fffffff) % 4; //type
    Locus[i][5] = 1; //alive
    switch (Locus[i][0]) {
      case 0:
        Locus[i][1] = -5;
        Locus[i][2] = (rnd.nextInt() & 0x7fffffff) % SHeight;
        Locus[i][3] = (rnd.nextInt() & 0x7fffffff) % 3 + 1; //vx
        Locus[i][4] = (rnd.nextInt()) % 3; //vy
        break;
      case 1:
        Locus[i][1] = SWidth + 5;
        Locus[i][2] = (rnd.nextInt() & 0x7fffffff) % SHeight;
        Locus[i][3] = ((rnd.nextInt() & 0x7fffffff) % 3 + 1) * -1; //vx
        Locus[i][4] = (rnd.nextInt()) % 3; //vy
        break;
      case 2:
        Locus[i][1] = (rnd.nextInt() & 0x7fffffff) % SWidth;
        Locus[i][2] = -5;
        Locus[i][3] = (rnd.nextInt()) % 3; //vx
        Locus[i][4] = (rnd.nextInt() & 0x7fffffff) % 3 + 1; //vy
        break;
      case 3:
        Locus[i][1] = (rnd.nextInt() & 0x7fffffff) % SWidth;
        Locus[i][2] = SHeight + 5;
        Locus[i][3] = (rnd.nextInt()) % 3; //vx
        Locus[i][4] = ((rnd.nextInt() & 0x7fffffff) % 3 + 1) * -1; //vy
        break;
    }
  }

  //--- 显示子弹 ----------------------------------------------------------------
  public void paint(Graphics g, int planeX, int planeY) {
    for (int i = 0; i < Locus.length; i++) {
      if (Locus[i][5] == 0) continue;
      if (isCollision(planeX, planeY, i)) {   // 碰撞判断
        if (!manGC.gameover) manGC.gameover = true;
        manGC.SpExplosion.setPosition(Locus[i][1] - 16, Locus[i][2] - 16);
        continue;
      }
      Bullets.setPosition(Locus[i][1], Locus[i][2]);
      Bullets.paint(g);
      UpdataBulletLocus(i); // 更新运行轨迹数组
    }
  }

  //--- 更新运行轨迹数组 ---------------------------------------------------------
  private void UpdataBulletLocus(int i) {
    Locus[i][1] += Locus[i][3];
    Locus[i][2] += Locus[i][4];
    if (Locus[i][1] < -5 || Locus[i][1] > SWidth + 5) {
      Locus[i][3] *= -1;
    }
    if (Locus[i][2] < -5 || Locus[i][2] > SHeight + 5) {
      Locus[i][4] *= -1;
    }
  }

  //--- 碰撞判断 ----------------------------------------------------------------
  private boolean isCollision(int planeX, int planeY, int i) {
    boolean result = false;
    int planeXCenter  = planeX + 12;
    int planeYCenter  = planeY + 12;
    int bulletXCenter = Locus[i][1] + 3;
    int bulletYCenter = Locus[i][2] + 3;
    if (Math.abs(planeXCenter - bulletXCenter) < 10) {
      if (Math.abs(planeYCenter - bulletYCenter ) < 10) {
        result = true;
      }
    }
    return result;
  }

}