LCOM1920-T5G03

#include <lcom/lcf.h>

#include "ent.h"

#include "graph.h"

#include "sprite.h"

#include "utils.h"

#include <math.h>

static double scale = 1.0;

static int16_t x_origin = 0;

static int16_t y_origin = 0;

void (ent_set_scale) (double n){ scale = n; }

void (ent_set_origin)(double x, double y){ x_origin = x; y_origin = y; }

double (ent_get_scale)  (void){ return scale; }

double (ent_get_XLength)(void){ return graph_get_XRes()/scale; }

double (ent_get_YLength)(void){ return graph_get_YRes()/scale; }

struct gunner{

    double x, y; //real position

    sprite_t *dude;

    sprite_t *weapon;

};

gunner_t* (gunner_ctor)(basic_sprite_t *dude, basic_sprite_t *weapon){

    gunner_t *ret = malloc(sizeof(gunner_t));

    if(ret == NULL) return NULL;

    ret->x = 0.0;

    ret->y = 0.0;

    ret->dude   = sprite_ctor(dude  );

    ret->weapon = sprite_ctor(weapon);

    if(ret->dude == NULL || ret->weapon == NULL){

        gunner_dtor(ret);

        return NULL;

    } else return ret;

}

void (gunner_dtor)(gunner_t *p){

    if(p == NULL) return;

    sprite_dtor(p->dude);

    sprite_dtor(p->weapon);

    free(p);

}

void (gunner_set_pos)  (gunner_t *p, double x, double y){ p->x = x; p->y = y; }

void (gunner_set_angle)(gunner_t *p, double angle      ){

    sprite_set_angle(p->dude  , angle);

    sprite_set_angle(p->weapon, angle);

}

double  (gunner_get_x)       (const gunner_t *p){ return p->x; }

double  (gunner_get_y)       (const gunner_t *p){ return p->y; }

int16_t (gunner_get_x_screen)(const gunner_t *p){ return (p->x-x_origin)*scale; }

int16_t (gunner_get_y_screen)(const gunner_t *p){ return (p->y-y_origin)*scale; }

void (gunner_draw)(gunner_t *p){

    const int16_t x_screen = gunner_get_x_screen(p);

    const int16_t y_screen = gunner_get_y_screen(p);

    sprite_set_pos  (p->dude  , x_screen, y_screen);

    sprite_set_pos  (p->weapon, x_screen, y_screen);

    sprite_set_scale(p->dude  , scale);

    sprite_set_scale(p->weapon, scale);

    sprite_draw     (p->weapon);

    sprite_draw     (p->dude  );

}

struct bullet{

    double x, y; //real position

    double vx, vy;

    sprite_t *b;

};

bullet_t* (bullet_ctor)(basic_sprite_t *b, double x, double y, double vx, double vy){

    bullet_t *ret = malloc(sizeof(bullet_t));

    if(ret == NULL) return NULL;

    ret-> x =  x;

    ret-> y =  y;

    ret->vx = vx;

    ret->vy = vy;

    ret->b = sprite_ctor(b);

    if(ret->b == NULL){

        bullet_dtor(ret);

        return NULL;

    }

    double angle = atan2(-ret->vy, ret->vx);

    sprite_set_angle(ret->b, angle-M_PI_2);

    return ret;

}

void (bullet_dtor)(bullet_t *p){

    if(p == NULL) return;

    sprite_dtor(p->b);

    free(p);

}

double  (bullet_get_x)       (const bullet_t *p){ return p->x; }

double  (bullet_get_y)       (const bullet_t *p){ return p->y; }

int16_t (bullet_get_x_screen)(const bullet_t *p){ return (p->x-x_origin)*scale; }

int16_t (bullet_get_y_screen)(const bullet_t *p){ return (p->y-y_origin)*scale; }

void (bullet_update_movement)(bullet_t *p){

    p->x += p->vx;

    p->y += p->vy;

}

void (bullet_draw)(bullet_t *p){

    const int16_t x_screen = bullet_get_x_screen(p);

    const int16_t y_screen = bullet_get_y_screen(p);

    sprite_set_pos  (p->b, x_screen, y_screen);

    sprite_set_scale(p->b, scale);

    sprite_draw     (p->b);

}

struct map{

    basic_sprite_t *bsp_background;

    sprite_t *background;

    uint8_t *collide;

};

map_t* (map_ctor)(const char **background, const char **collide){

    map_t *ret = malloc(sizeof(map_t));

    if(ret == NULL) return NULL;

    ret->bsp_background = NULL;

    ret->background     = NULL;

    ret->collide        = NULL;

    ret->bsp_background = basic_sprite_ctor(background, 0, 0);

    ret->background     = sprite_ctor(ret->bsp_background);

    if(ret->bsp_background == NULL ||

        ret->background     == NULL){ map_dtor(ret); return NULL; }

    basic_sprite_t *bsp_collide = basic_sprite_ctor(collide, 0, 0);

    if(bsp_collide == NULL){ map_dtor(ret); return NULL; }

    const uint16_t W = basic_sprite_get_w(bsp_collide);

    const uint16_t H = basic_sprite_get_h(bsp_collide);

    ret->collide = malloc(W*H*sizeof(uint8_t));

    if(ret->collide == NULL){ map_dtor(ret); return NULL; }

    const uint8_t *m = basic_sprite_get_map(bsp_collide);

    for(unsigned i = 0; i < W*H; ++i){

        ret->collide[i] = (m[4*i+3] < ALPHA_THRESHOLD ? 1 : 0);

    }

    basic_sprite_dtor(bsp_collide);

    return ret;

}

void (map_dtor)(map_t *p){

    if(p == NULL) return;

    sprite_dtor(p->background);

    basic_sprite_dtor(p->bsp_background);

    free(p->collide);

    free(p);

}

int16_t (map_get_x_screen)(const map_t *p){ return (-x_origin)*scale; }

int16_t (map_get_y_screen)(const map_t *p){ return (-y_origin)*scale; }

int (map_collides_point)(const map_t *p, double x, double y){

    const uint16_t w = sprite_get_w(p->background), h = sprite_get_h(p->background);

    int16_t x_ = x, y_ = y;

    if(x_ < 0 || w <= x_ || y_ < 0 || h <= y_) return 0;

    uint32_t pos = x_ + y_*w;

    return p->collide[pos];

}

int (map_collides_gunner)(const map_t *p, const gunner_t *shooter) {

    double radius = sprite_get_w(shooter->dude)/2.0;

    double shooter_x = gunner_get_x(shooter);

    double shooter_y = gunner_get_y(shooter);

    for (double x = -radius; x < radius; x += 1) {

        double y1 = sqrt(radius*radius - x*x);

        double y2 = -y1;

        if (map_collides_point(p, shooter_x + x, shooter_y + y1) || map_collides_point(p, shooter_x + x, shooter_y + y2)) return 1;

    }

    return 0;

}

int (map_collides_bullet)(const map_t *p, const bullet_t *bull){

    double radius = max(sprite_get_w(bull->b), sprite_get_h(bull->b))/2.0;

    double bullet_x = bullet_get_x(bull);

    double bullet_y = bullet_get_y(bull);

    for (double x = -radius; x < radius; x += 1){

        double y1 = sqrt(radius*radius - x*x);

        double y2 = -y1;

        if (map_collides_point(p, bullet_x + x, bullet_y + y1) || map_collides_point(p, bullet_x + x, bullet_y + y2)) return 1;

    }

    return 0;

}

void   (map_draw)(map_t *p){

    const int16_t x_screen = map_get_x_screen(p);

    const int16_t y_screen = map_get_y_screen(p);

    sprite_set_pos  (p->background, x_screen, y_screen);

    sprite_set_scale(p->background, scale);

    sprite_draw     (p->background);

}