src/player.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <SDL2/SDL.h>
   4
   5 #include "./player.h"
   6 #include "./platforms.h"
   7
   8 #define PLAYER_WIDTH 50.0f
   9 #define PLAYER_HEIGHT 50.0f
  10 #define PLAYER_SPEED 500.0f
  11 #define PLAYER_GRAVITY 1500.0f
  12
  13 struct player_t {
  14     vec_t position;
  15     vec_t velocity;
  16     vec_t movement;
  17 };
  18
  19 /* static const vec_t impact_vecs[RECT_SIDE_N] = { */
  20 /*     /\* left *\/ */
  21 /*     { .x = 1.0f, .y = 0.0f }, */
  22 /*     /\* right *\/ */
  23 /*     { .x = -1.0f, .y = 0.0f }, */
  24 /*     /\* top *\/ */
  25 /*     { .x = 0.0f, .y = 1.0f }, */
  26 /*     /\* bottom *\/ */
  27 /*     { .x = 0.0f, .y = -1.0f } */
  28 /* }; */
  29
  30 player_t *create_player(float x, float y)
  31 {
  32     player_t *player = malloc(sizeof(player_t));
  33
  34     if (player == NULL) {
  35         return NULL;
  36     }
  37
  38     player->position.x = x;
  39     player->position.y = y;
  40     player->velocity.x = 0.0f;
  41     player->velocity.y = 0.0f;
  42     player->movement.x = 0.0f;
  43     player->movement.y = 0.0f;
  44
  45     return player;
  46 }
  47
  48 void destroy_player(player_t * player)
  49 {
  50     free(player);
  51 }
  52
  53 int render_player(const player_t * player,
  54                   SDL_Renderer *renderer,
  55                   const camera_t *camera)
  56 {
  57     if (SDL_SetRenderDrawColor(renderer, 96, 255, 96, 255) < 0) {
  58         return -1;
  59     }
  60     rect_t player_object = {
  61         .x = player->position.x,
  62         .y = player->position.y,
  63         .w = PLAYER_WIDTH,
  64         .h = PLAYER_HEIGHT
  65     };
  66
  67
  68     return camera_fill_rect(camera, renderer, &player_object);
  69 }
  70
  71 void update_player(player_t * player,
  72                    const platforms_t *platforms,
  73                    Uint32 delta_time)
  74 {
  75     float d = (float) delta_time / 1000.0f;
  76
  77     float x = player->position.x;
  78     float y = player->position.y;
  79
  80     rect_t player_object = {
  81         .x = x + (player->velocity.x + player->movement.x) * d,
  82         .y = y + (player->velocity.y + player->movement.y) * d,
  83         .w = PLAYER_WIDTH,
  84         .h = PLAYER_HEIGHT
  85     };
  86
  87     int sides[4] = {0, 0, 0, 0};
  88
  89     platforms_rect_object_collide(platforms, &player_object, sides);
  90
  91     if (sides[RECT_SIDE_LEFT] || sides[RECT_SIDE_RIGHT]) {
  92         player->velocity.x = 0.0f;
  93         player->movement.x = 0.0f;
  94     }
  95
  96     int hit_floor_ceiling = 0;
  97
  98     if (sides[RECT_SIDE_TOP] || sides[RECT_SIDE_BOTTOM]) {
  99         player->velocity.y = 0.0f;
 100         player->movement.y = 0.0f;
 101         hit_floor_ceiling = 0;
 102     }
 103
 104     player->position.x += (player->velocity.x + player->movement.x) * d;
 105     player->position.y += (player->velocity.y + player->movement.y) * d;
 106
 107     if (!hit_floor_ceiling) {
 108         player->velocity.y += PLAYER_GRAVITY * d;
 109     }
 110 }
 111
 112 void player_move_left(player_t *player)
 113 {
 114     player->movement.x = -PLAYER_SPEED;
 115     player->movement.y = 0.0f;
 116 }
 117
 118 void player_move_right(player_t *player)
 119 {
 120     player->movement.x = PLAYER_SPEED;
 121     player->movement.y = 0.0f;
 122 }
 123
 124 void player_stop(player_t *player)
 125 {
 126     player->movement.x = 0.0f;
 127     player->movement.y = 0.0f;
 128 }
 129
 130 void player_jump(player_t *player)
 131 {
 132     player->velocity.y = -1000.0f;
 133 }
 134
 135 void player_focus_camera(player_t *player,
 136                          camera_t *camera)
 137 {
 138     camera_translate(camera,
 139                      player->position.x - 800.0f * 0.5f + PLAYER_WIDTH * 0.5f,
 140                      player->position.y - 600.0f * 0.5f + PLAYER_HEIGHT * 0.5f);
 141 }