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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* collision.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: dkaiser <dkaiser@student.42heilbronn.de +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2024/05/14 11:48:59 by dkaiser #+# #+# */
/* Updated: 2024/05/15 15:19:54 by dkaiser ### ########.fr */
/* */
/* ************************************************************************** */
#include "so_long.h"
static int check_map_collision_for_tile(t_collider collider, t_tilemap *map,
t_ivector tile, enum e_tile type);
/*
* Checks if a and b are colliding and returns the direction relative to a.
* Example: The top left edge of a and the bottom right of b overlap.
* In this case, check_collision() will return (UP | LEFT).
*/
int check_collision(t_collider a, t_collider b)
{
int result;
result = 0;
if (a.position.x < b.size.x + b.position.x && a.position.x
+ a.size.x > b.position.x && a.position.y < b.size.y + b.position.y
&& a.position.y + a.size.y > b.position.y)
{
if (a.position.x < b.position.x)
result |= RIGHT;
if (a.position.x > b.position.x)
result |= LEFT;
if (a.position.y < b.position.y)
result |= DOWN;
if (a.position.y > b.position.y)
result |= UP;
}
return (result);
}
int check_map_collision(t_collider collider, t_tilemap *map, enum e_tile type)
{
int result;
t_ivector local_tile;
t_ivector check_tile;
int x;
int y;
result = 0;
local_tile = screen_to_grid_pos(collider.position, map->tile_size);
x = -1;
while (x <= 1)
{
y = -1;
while (y <= 1)
{
check_tile.x = local_tile.x + x;
check_tile.y = local_tile.y + y;
result |= check_map_collision_for_tile(collider, map, check_tile, type);
y++;
}
x++;
}
return (result);
}
static int check_map_collision_for_tile(t_collider collider, t_tilemap *map,
t_ivector tile, enum e_tile type)
{
t_collider tile_collider;
if (get_tile(map, tile.x, tile.y) == type)
{
tile_collider.position = grid_to_screen_pos(tile, map->tile_size);
tile_collider.size.x = map->tile_size.x;
tile_collider.size.y = map->tile_size.y;
return (check_collision(collider, tile_collider));
}
return (0);
}
void move_and_slide(t_actor *actor, t_tilemap *map, double delta_time)
{
t_collider c;
c.size = actor->size;
c.position.x = actor->position.x + (actor->velocity.x * delta_time);
c.position.y = actor->position.y;
if ((check_map_collision(c, map, WALL) & (RIGHT | LEFT)) == 0)
actor->position.x = c.position.x;
else
actor->velocity.x = 0;
c.position.x = actor->position.x;
c.position.y = actor->position.y + (actor->velocity.y * delta_time);
if ((check_map_collision(c, map, WALL) & (UP | DOWN)) == 0)
actor->position.y = c.position.y;
else
actor->velocity.y = 0;
}
int is_on_floor(t_collider collider, t_tilemap *map)
{
collider.position.y += 5;
if (check_map_collision(collider, map, WALL))
return (1);
return (0);
}
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