File content as of revision 28:a5958497d5ce:

#include "Alien.h"

const int k_alien_sprite[6][7] = {
    { 0,0,1,1,1,1,0,},
    { 0,1,0,1,1,0,1,},
    { 0,1,0,1,1,0,1,},
    { 0,0,1,1,1,1,0,},
    { 0,1,0,1,0,1,0,},
    { 1,0,0,1,0,0,1,},
};

Alien::Alien() {

}
 
Alien::~Alien() {
    
}

void Alien::init(Gamepad &pad) {
    position_x_ = 10;
    position_y_ = 22;
    alien_move_counter_ = 0;
    srand(pad.read_adc()*64000);
    random_move_counter_ = 0;
    random_direction_ = 0;
    direction_ = rand()%2;
    alien_move_counter_ = 0;
}
 
void Alien::draw_alien(N5110 &lcd,Vector2D spaceship_pos,Direction d_, 
int map_length_, int position_x_map_) {
    //moves alien spaceship movemen 
    position_x_ += calc_alien_movement(d_);
    
    //Alien moves on its own but at half speed of spaceship 
    if (alien_move_counter_%2 == 0) {
        if (random_move_counter_ == 0){
            set_random_move();
        }
        move_direction();
        off_screen_x_y_checker(map_length_, position_x_map_);
        random_move_counter_ --; 
        alien_fire_counter_++;
         
        //printf("random_move_counter_ =  %d\n", random_move_counter_);
    }
    alien_move_counter_++;

    lcd.drawSprite(position_x_, position_y_, 6, 7, (int*)k_alien_sprite);
}

void Alien::off_screen_x_y_checker(int map_length_, int position_x_map_){
    // checks y postion of alien and then alters alien movement direction if at 
    // edge  of map
    if (position_y_ < 0) {
        // sets alien direction to one that increces y value 
        if(direction_){
            random_direction_ = 1;
        }else{
            random_direction_ = 4;
        }
    }else if (position_y_ > 40) {
        // sets alien direction to one that decreces y value 
        if(direction_){
            random_direction_ = 2;
        }else{
            random_direction_ = 5;
        }
    } 
    
    // loops the alien round if it reaches the end of the map 
    if(position_x_ <= (84 - map_length_)){
       position_x_ += map_length_; 
    }else if (position_x_ >= map_length_){
        position_x_ -= map_length_ + 10;
    }   
    
    // Debug and check variables when defined  
    #ifdef CALCULATE_ALIEN_MOVEMENT_DEBUG   
        printf("\nposition_x_map_ =  %d\n", position_x_map_);
        printf("map_length_  =  %d\n", map_length_ );
        printf("map_length_ + position_x_map_ =  %d\n", map_length_ + 
        position_x_map_);
    #endif
}   

void Alien::move_hunt_mode(Vector2D spaceship_pos){
    if(spaceship_pos.x <= position_x_){
       position_x_ --;
    }else{
        position_x_ ++;
    }
}

bool Alien::check_collision(Weapons bullet) {
    bool collision = false; 
    //printf ("Collision 1 = %d\n", collision);
    
    // checks collision if bullet is going in east direction 
    if(bullet.get_direction()){
        Vector2D bullet_pos_two = bullet.get_pos_two();
        //int bullet_pos_twox = bullet_pos_two.x;
        //int bullet_pos_twoy = bullet_pos_two.y;
        //printf ("alien x = %d, bullet x = %d\n", position_x_,bullet_pos_twox);
        //printf ("alien y = %d, bullet y = %d\n", position_y_,bullet_pos_twoy);
        
        if(bullet_pos_two.x >= position_x_ && position_y_ <= bullet_pos_two.y && 
        bullet_pos_two.y <= (position_y_ + 7)){
            collision = true;
        }
    //printf ("Collision 2 = %d\n", collision);  
      
    // checks collision if bullet is going in west direction 
    }else if(!bullet.get_direction()){
        Vector2D bullet_pos_one = bullet.get_pos_one();
        if(bullet_pos_one.x <= position_x_ + 6 && 
        position_y_ <= bullet_pos_one.y && 
        bullet_pos_one.y <= (position_y_ + 7)){
            collision = true;
        }
        
     //printf ("Collision 3 = %d\n", collision);   
    }
    
    //printf ("Collision 4 = %d\n", collision);   
    return collision;
}

int Alien::calc_alien_movement(Direction d_){  
    // moves the alien in oposite direction to spaceship when it's position is 
    // at min and max x positions and joystick has direction     
    if (d_ == W || d_ == NW || d_ == SW){ 
        return 2;
    }else if (d_ == E || d_ == NE || d_ == SE){ 
        return -2; 
    }else {
        return 0;
    }
}

Vector2D Alien::get_pos(){
    Vector2D pos = {position_x_,position_y_};
    return pos;
}

int Alien::get_alien_fire_counter(){
    return alien_move_counter_;
}