stars.h

00001 #ifndef STARS_H
00002 #define STARS_H
00003 
00004 /**
00005  * Stars Class
00006  * @brief Manages, updates and draws the background stars.
00007  * @author Dmitrijs Griskovs
00008  * @date 15/04/2019
00009  */
00010 class Stars {
00011 public:
00012     /**
00013      * @var static const int max_small_stars variable;
00014      * @brief Sets the limit of maximum small stars allowed on the screen.
00015      */
00016     static const int max_small_stars = 10;
00017     /**
00018      * @var static const int max_medium_stars variable;
00019      * @brief Sets the limit of maximum medium stars allowed on the screen.
00020      */
00021     static const int max_medium_stars = 5;
00022     
00023     GameObject small_stars[max_small_stars];
00024     GameObject medium_stars[max_medium_stars];
00025     
00026     /** 
00027      * @brief draws small stars on the screen.
00028      * @details when a small star is active, this function updates the position and
00029      * draws it on the screen. Also, When the star leaves the screen limits it
00030      * deactivates the star for a new star to fly.
00031      */
00032     void updateAndDrawSmallStars(){
00033         for (int i = 0; i < max_small_stars; ++i) {
00034             if (small_stars[i].active) {
00035                 small_stars[i].pos.x -= small_star_speed;
00036                 if (small_stars[i].pos.x <= 0){
00037                     small_stars[i].active = false;   
00038                 }       
00039                 drawSpriteOnTop(small_stars[i].pos, small_star_sprite);
00040             }
00041         }        
00042     }
00043    
00044     /**
00045      * @brief draws medium stars on the screen.
00046      * @details when a medium star is active, this function updates the position and
00047      * draws it on the screen. Also, When the star leaves the screen limits it
00048      * deactivates the star for a new star to fly.
00049      */
00050     void updateAndDrawMediumStars(){
00051         for (int i = 0; i < max_medium_stars; ++i) {
00052             if (medium_stars[i].active) {
00053                 medium_stars[i].pos.x -= medium_star_speed;
00054                 if (medium_stars[i].pos.x <= -2){
00055                     medium_stars[i].active = false;   
00056                 }
00057                 drawSpriteOnTop(medium_stars[i].pos, medium_star_sprite);
00058             }
00059         }
00060     }
00061     
00062     /** @brief A separate function for delaying the stars spawn time.*/
00063     void starsSpawnDelay(){
00064         if  (stars_delay == stars_delay_max){ 
00065             //This is dealy between stars generation.
00066             newSmallStarFlies();
00067             newMediumStarFlies();
00068             stars_delay = 0;
00069         }
00070         else {
00071             stars_delay += 1;
00072         }   
00073     }
00074     /**
00075      * @var int stars delay;
00076      * @brief The value is incremented every time until it reaches stars_delay_max
00077      * value, which triggers the stars spawn and then is reseted to zero.  .
00078      */
00079     int stars_delay;
00080     
00081     
00082       
00083 private:
00084     /**
00085      * @var static const int small_star_speed variable;
00086      * @brief Sets the speed of the small stars.
00087      */
00088     static const int small_star_speed = 2;
00089     /**
00090      * @var static const int medium_star_speed variable;
00091      * @brief Sets the speed of the medium stars.
00092      */
00093     static const int medium_star_speed = 4;
00094     /**
00095      * @var static const int stars_delay_max variable;
00096      * @brief Sets the limit of the stars delay spawn.
00097      */
00098     static const int stars_delay_max = 5;
00099     
00100     /** 
00101      * @brief Makes a small star active and gives it the start positions.
00102      * @details Searches through the small stars array and if a star is not active,
00103      * it becomes active and is given the position of x (which is 0) and.
00104      * and random position of y.
00105      */
00106     void newSmallStarFlies() {
00107         // Search the array of stars if inactive we can use it. - the same as with blasts
00108         int found = -1;
00109         for (int i = 0; i < max_small_stars; ++i) {
00110             if (!small_stars[i].active) {
00111                 found = i;
00112                 break;
00113             }
00114         }
00115         
00116         if (found != -1) {
00117             small_stars[found].active = true;
00118             small_stars[found].pos.x = screen_width;
00119             small_stars[found].pos.y = rand() % screen_height + game_area_y;
00120         }
00121     }
00122     
00123      /** 
00124      * @brief Makes a medium star active and gives it the start positions. 
00125      * @details Searches through the medium stars array and if a star is not active,
00126      * it becomes active and is given the position of x (which is 0) and.
00127      * and random position of y.
00128       */
00129     void newMediumStarFlies() {
00130         // Search the array of stars if inactive we can use it. - the same as with blasts
00131         int found = -1;
00132         for (int i = 0; i < max_medium_stars; ++i) {
00133             if (!medium_stars[i].active) {
00134                 found = i;
00135                 break;
00136             }
00137         }
00138         if (found != -1) {
00139             medium_stars[found].active = true;
00140             medium_stars[found].pos.x = screen_width;
00141             medium_stars[found].pos.y = rand() % screen_height + game_area_y;
00142         }
00143     }  
00144 };
00145 #endif