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#include <SDL2/SDL.h>
#include <stdbool.h>
#include "pacman.h"
#include "collision.h"
#define PACMAN_SPEED 261
#define PACMAN_SIDE 40
#define EDGE_TURN_LIMIT 5
extern const Uint8* keyboard;
SDL_Rect* get_colliding_tile_raw(SDL_Rect*, struct map* map);
SDL_Rect* get_colliding_tile(struct pacman* pacman, struct map* map);
void rect_step_one_pixel(SDL_Rect* r, enum facing);
void handle_pacman_input(struct pacman* pacman, struct map* map) {
SDL_Rect r = {
.x = pacman->xpos,
.y = pacman->ypos,
.w = PACMAN_SIDE,
.h = PACMAN_SIDE
};
if(keyboard[SDL_SCANCODE_UP] && pacman->facing != FACING_UP) {
r.y--;
for(int i = 0; i < EDGE_TURN_LIMIT + 1; i++) {
if(get_colliding_tile_raw(&r, map) == NULL) {
pacman->xpos = r.x;
pacman->facing = FACING_UP;
break;
}
rect_step_one_pixel(&r, pacman->facing);
}
} else if(keyboard[SDL_SCANCODE_DOWN] && pacman->facing != FACING_DOWN) {
r.y++;
for(int i = 0; i < EDGE_TURN_LIMIT + 1; i++) {
if(get_colliding_tile_raw(&r, map) == NULL) {
pacman->xpos = r.x;
pacman->facing = FACING_DOWN;
break;
}
rect_step_one_pixel(&r, pacman->facing);
}
} else if(keyboard[SDL_SCANCODE_LEFT] && pacman->facing != FACING_LEFT) {
r.x--;
for(int i = 0; i < EDGE_TURN_LIMIT + 1; i++) {
if(get_colliding_tile_raw(&r, map) == NULL) {
pacman->ypos = r.y;
pacman->facing = FACING_LEFT;
break;
}
rect_step_one_pixel(&r, pacman->facing);
}
} else if(keyboard[SDL_SCANCODE_RIGHT] && pacman->facing != FACING_RIGHT) {
r.x++;
for(int i = 0; i < EDGE_TURN_LIMIT + 1; i++) {
if(get_colliding_tile_raw(&r, map) == NULL) {
pacman->ypos = r.y;
pacman->facing = FACING_RIGHT;
break;
}
rect_step_one_pixel(&r, pacman->facing);
}
}
}
void update_pacman(struct pacman* pacman, float dt, struct map* map) {
handle_pacman_input(pacman, map);
if(pacman->facing == FACING_UP) {
pacman->ypos -= PACMAN_SPEED * dt;
SDL_Rect* colliding_tile =
get_colliding_tile(pacman, map);
if(colliding_tile != NULL) {
pacman->ypos =
colliding_tile->y + colliding_tile->h;
} else {
update_animation(&pacman->animations[pacman->facing], dt);
}
} else if(pacman->facing == FACING_DOWN) {
pacman->ypos += PACMAN_SPEED * dt;
SDL_Rect* colliding_tile =
get_colliding_tile(pacman, map);
if(colliding_tile != NULL) {
pacman->ypos =
colliding_tile->y - PACMAN_SIDE;
} else {
update_animation(&pacman->animations[pacman->facing], dt);
}
} else if(pacman->facing == FACING_LEFT) {
pacman->xpos -= PACMAN_SPEED * dt;
SDL_Rect* colliding_tile =
get_colliding_tile(pacman, map);
if(colliding_tile != NULL) {
pacman->xpos =
colliding_tile->x + colliding_tile->w;
} else {
update_animation(&pacman->animations[pacman->facing], dt);
}
} else if(pacman->facing == FACING_RIGHT) {
pacman->xpos += PACMAN_SPEED * dt;
SDL_Rect* colliding_tile =
get_colliding_tile(pacman, map);
if(colliding_tile != NULL) {
pacman->xpos =
colliding_tile->x - PACMAN_SIDE;
} else {
update_animation(&pacman->animations[pacman->facing], dt);
}
}
}
void draw_pacman(struct demo* demo, const struct pacman* pacman) {
const struct animation* current_animation =
&pacman->animations[pacman->facing];
SDL_Rect d_rect = {
.x = pacman->xpos,
.y = pacman->ypos,
.w = PACMAN_SIDE,
.h = PACMAN_SIDE
};
draw_animation(demo, current_animation, &d_rect);
}
SDL_Rect* get_colliding_tile(struct pacman* pacman, struct map* map) {
SDL_Rect r = (SDL_Rect){
.x = pacman->xpos,
.y = pacman->ypos,
.w = PACMAN_SIDE,
.h = PACMAN_SIDE
};
return get_colliding_tile_raw(&r, map);
}
SDL_Rect* get_colliding_tile_raw(SDL_Rect* r, struct map* map) {
for(int i = 0; i < map->collider_count; i++) {
if(is_colliding(r, &map->colliders[i])) {
return &map->colliders[i];
}
}
return NULL;
}
void rect_step_one_pixel(SDL_Rect* r, enum facing facing) {
switch(facing) {
case FACING_UP:
r->y--;
break;
case FACING_DOWN:
r->y++;
break;
case FACING_LEFT:
r->x--;
break;
case FACING_RIGHT:
r->x++;
break;
}
}
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