bullets.java

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

public class Bullets extends Sprite {
  private int[][] bullets;
  private int BULLETS_NUM;
  private Random random;
  private int frameWidth,frameHeight;
  public static final int BULLET_TYPE_LEFT=0;
  public static final int BULLET_TYPE_RIGHT=1;
  public static final int BULLET_TYPE_TOP=2;
  public static final int BULLET_TYPE_BOTTOM=3;
  private static final int ALIVE = 1;
  private static final int DEFAULT_SPEED =3;
  private int CanvasWidth,CanvasHeight;

 

  public Bullets(Image image,int frameWidth,int frameHeight) {
    super(image,frameWidth,frameHeight);
    this.frameWidth = frameWidth;
    this.frameHeight = frameHeight;
    random=new Random();
    defineReferencePixel(frameWidth/2 , frameHeight/2 );

  }
  public void setBulletsNum(int BULLETS_NUM){
    this.BULLETS_NUM = BULLETS_NUM;
  }
  public void setCanvasSize(int CanvasWidth,int CanvasHeight){
    this.CanvasWidth = CanvasWidth;
    this.CanvasHeight = CanvasHeight;
  }

  public void initBullets(){
    bullets=new int[BULLETS_NUM][6];
    for (int i = 0; i < bullets.length; i++) {
      initBullet(i);
    }
  }

  private void initBullet(int i) {
    bullets[i][0] = (random.nextInt() & 0x7fffffff) % 4; //type
    bullets[i][5] = ALIVE; //alive
    switch (bullets[i][0]) {
      case BULLET_TYPE_LEFT:
        bullets[i][1] = -frameWidth;
        bullets[i][2] = (random.nextInt() & 0x7fffffff) % CanvasHeight;
        bullets[i][3] = (random.nextInt() & 0x7fffffff) % 3 + 1; //vx
        bullets[i][4] = (random.nextInt()) % 3; //vy
        break;
      case BULLET_TYPE_RIGHT:
        bullets[i][1] = CanvasWidth + frameWidth;
        bullets[i][2] = (random.nextInt() & 0x7fffffff) % CanvasHeight;
        bullets[i][3] = ((random.nextInt() & 0x7fffffff) % 3 + 1) * -1; //vx
        bullets[i][4] = (random.nextInt()) % 3; //vy
        break;
      case BULLET_TYPE_TOP:
        bullets[i][1] = (random.nextInt() & 0x7fffffff) % CanvasWidth;
        bullets[i][2] = -frameHeight;
        bullets[i][3] = (random.nextInt()) % 3; //vx
        bullets[i][4] = (random.nextInt() & 0x7fffffff) % 3 + 1; //vy
        break;
      case BULLET_TYPE_BOTTOM:
        bullets[i][1] = (random.nextInt() & 0x7fffffff) % CanvasWidth;
        bullets[i][2] = CanvasHeight + frameHeight;
        bullets[i][3] = (random.nextInt()) % 3; //vx
        bullets[i][4] = ( (random.nextInt() & 0x7fffffff) % 3 + 1) * -1; //vy
        break;
       
    }
   if(bullets[i][3]==0)
    {
    if(bullets[i][0] == BULLET_TYPE_RIGHT||bullets[i][0] == BULLET_TYPE_BOTTOM)
    bullets[i][3] = -DEFAULT_SPEED;
    else bullets[i][3] = DEFAULT_SPEED;
    }
    if(bullets[i][4]==0)
    {
    if(bullets[i][0] == BULLET_TYPE_RIGHT||bullets[i][0] == BULLET_TYPE_BOTTOM)
    bullets[i][4] = -DEFAULT_SPEED;
    else bullets[i][4] = DEFAULT_SPEED; 
    }
  }
  public void tick(){
    for (int i = 0; i < bullets.length; i++) {
    	tick(i);
   }
  }
  private void tick(int i){
    bullets[i][1]+=bullets[i][3];
    bullets[i][2]+=bullets[i][4];
    if(bullets[i][1]<-5 || bullets[i][1]>CanvasWidth+5){
      bullets[i][3]*=-1;
    }
    if(bullets[i][2]<-5 || bullets[i][2]>CanvasHeight+5){
      bullets[i][4]*=-1;
    }
 }
 
  public void draw(Graphics g) {
    for (int i = 0; i < bullets.length; i++) {
      if(bullets[i][5]!= ALIVE){
        continue;
      }
      draw(g,i);
    }
  }

  private void draw(Graphics g,int i){
    setPosition(bullets[i][1],bullets[i][2]);
    paint(g);
  }
  public boolean collidesWith(Sprite s){
     for (int i = 0; i < bullets.length; i++) {
     if(bullets[i][5]!= ALIVE){
     	 
     	continue;
     }
     setPosition(bullets[i][1],bullets[i][2]);
     if(collidesWith(s,true)){

     return true;
     
     }

     } 
     return false;
  }
 

}