// updateBullet
// updates a bullet according to the game rules
void updateBullet(Bullet& obj)
{
byte id;
if(obj.active)
{
// horizontal physics
obj.x += obj.vx;
// vertical physics
obj.y += obj.vy;
// collide with zombies
for(id=0; id<ZOMBIE_MAX; id++)
{
if(zombieCollision(zombies[id], obj.x, obj.y, BULLET_WIDTH, BULLET_HEIGHT))
{
obj.active = false;
zombieHealthOffset(zombies[id], -1);
break;
}
}
// delete if gone off screen
if((obj.x < mapPositionX) || (obj.y < mapPositionY) || (obj.x > WIDTH + mapPositionX) || (obj.y > HEIGHT + mapPositionY))
{
obj.active = false;
}
}
}
//movement of zombies to follow player
void Zombie::move(){
if((x()<player1->x()) && (y()<player1->y())){
zombieCollision();
setPos(x()+.7, y() + .7);
zombieCollision();
collision();
deleteZombie();
direct=1;
}
if((x()>player1->x()) && (y()<player1->y())){
zombieCollision();
setPos(x()-.7,y()+.7);
zombieCollision();
collision();
deleteZombie();
direct=2;
}
if((x()<player1->x()) && (y()>player1->y())){
zombieCollision();
setPos(x()+.7, y() -.7);
zombieCollision();
collision();
deleteZombie();
direct=3;
}
if((x()>player1->x()) && (y()>player1->y())){
zombieCollision();
setPos(x()-.7,y()-.7);
zombieCollision();
collision();
deleteZombie();
direct=4;
}
}
