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/*
* Copyright (C) 2021 P. J. McDermott
*
* This file is part of Maze Fight
*
* Maze Fight is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Maze Fight is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Maze Fight. If not, see <http://www.gnu.org/licenses/>.
*/
#include <SDL.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include "defs.h"
#include "maze.h"
#include "player.h"
enum _mf_player_dir {
MF_PLAYER_DIR_N_,
MF_PLAYER_DIR_U_,
MF_PLAYER_DIR_D_,
MF_PLAYER_DIR_L_,
MF_PLAYER_DIR_R_
};
struct mf_player {
struct mf_maze *maze;
int cell_width;
int speed;
enum _mf_player_dir cur_dir;
enum _mf_player_dir new_dir;
int turning;
int cur_x;
int cur_y;
int new_x;
int new_y;
int travel;
};
struct mf_player *
mf_player_new(struct mf_maze *maze, int cell_width)
{
struct mf_player *p;
p = calloc(1, sizeof(*p));
if (p == NULL) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,
"Couldn't create player: %s",
strerror(errno));
return NULL;
}
p->maze = maze;
p->cell_width = cell_width;
p->speed = MF_PLAYER_SPEED;
p->new_dir = MF_PLAYER_DIR_N_;
p->turning = 0;
p->cur_x = 0;
p->cur_y = 0;
p->travel = 0;
if (mf_maze_is_wall(maze, 0, 0, 1, 0)) {
p->cur_dir = MF_PLAYER_DIR_D_;
} else {
p->cur_dir = MF_PLAYER_DIR_R_;
}
return p;
}
static void
_mf_player_move(struct mf_player *p, enum _mf_player_dir dir)
{
p->new_dir = dir;
}
void
mf_player_key_event(struct mf_player *p, SDL_Event *e)
{
switch (e->type) {
case SDL_KEYDOWN:
switch (e->key.keysym.sym) {
case SDLK_UP:
_mf_player_move(p, MF_PLAYER_DIR_U_);
break;
case SDLK_DOWN:
_mf_player_move(p, MF_PLAYER_DIR_D_);
break;
case SDLK_LEFT:
_mf_player_move(p, MF_PLAYER_DIR_L_);
break;
case SDLK_RIGHT:
_mf_player_move(p, MF_PLAYER_DIR_R_);
break;
default:
break;
}
default:
break;
}
}
int
mf_player_update(struct mf_player *p)
{
int dx;
int dy;
if (p->travel > 0) {
/* Currently moving */
p->travel += p->speed;
if (p->travel >= p->cell_width) {
/* Reached next cell */
p->cur_x = p->new_x;
p->cur_y = p->new_y;
if (p->cur_dir == p->new_dir) {
/* Want to continue straight */
p->travel -= p->cell_width;
} else {
/* Want to stop or turn */
p->travel = 0;
}
} else {
/* Farther to go */
return 0;
}
}
if (p->new_dir != MF_PLAYER_DIR_N_ && p->cur_dir != p->new_dir) {
/* Want to turn */
p->cur_dir = p->new_dir;
p->new_dir = MF_PLAYER_DIR_N_;
p->turning = MF_PLAYER_TURN_TIME + 1;
}
if (p->turning > 0) {
/* Turning */
--p->turning;
}
if (p->turning == 0) {
/* Done turning */
if (p->new_dir != MF_PLAYER_DIR_N_) {
/* Want to move */
switch (p->new_dir) {
case MF_PLAYER_DIR_U_: dx = 0; dy = -1; break;
case MF_PLAYER_DIR_D_: dx = 0; dy = 1; break;
case MF_PLAYER_DIR_L_: dx = -1; dy = 0; break;
case MF_PLAYER_DIR_R_: dx = 1; dy = 0; break;
default: dx = 0; dy = 0; break;
}
p->new_dir = MF_PLAYER_DIR_N_;
if (mf_maze_is_wall(p->maze, p->cur_x, p->cur_y,
dx, dy)) {
return 0;
}
p->new_x = p->cur_x + dx;
p->new_y = p->cur_y + dy;
p->travel += p->speed;
}
}
return 0;
}
int
mf_player_render(struct mf_player *p, SDL_Renderer *renderer)
{
int e = 0;
int cx;
int cy;
int r;
int x;
int y;
int i;
if (SDL_SetRenderDrawColor(renderer,
MF_COLOR_PLYR_R, MF_COLOR_PLYR_G,
MF_COLOR_PLYR_B, MF_COLOR_PLYR_A) < 0) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,
"Couldn't render player: %s",
SDL_GetError());
e = -1;
}
cx = p->cur_x * p->cell_width + p->cell_width / 2;
cy = p->cur_y * p->cell_width + p->cell_width / 2;
switch (p->cur_dir) {
case MF_PLAYER_DIR_U_: cy -= p->travel; break;
case MF_PLAYER_DIR_D_: cy += p->travel; break;
case MF_PLAYER_DIR_L_: cx -= p->travel; break;
case MF_PLAYER_DIR_R_: cx += p->travel; break;
default: break;
}
r = p->cell_width / 2 - MF_PLAYER_P;
#define _mf_player_px(X, Y) \
do { \
if (SDL_RenderDrawPoint(renderer, cx + X, cy + Y) < 0) { \
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, \
"Couldn't render widget: %s", \
SDL_GetError()); \
e = -1; \
} \
} while (0)
/* TODO: This is one pixel larger than it should be. */
for (x = 0, y = r; y > x; ++x) {
y = round(sqrt((r-0.5)*(r-0.5) - (x-0.5)*(x-0.5)) + 0.5);
for (i = 0; i <= y; ++i) _mf_player_px( x, i);
for (i = 0; i >= 0-y; --i) _mf_player_px( x, i);
for (i = 0; i <= y; ++i) _mf_player_px(0-x, i);
for (i = 0; i >= 0-y; --i) _mf_player_px(0-x, i);
for (i = 0; i <= y; ++i) _mf_player_px( i, x);
for (i = 0; i <= y; ++i) _mf_player_px( i, 0-x);
for (i = 0; i >= 0-y; --i) _mf_player_px( i, x);
for (i = 0; i >= 0-y; --i) _mf_player_px( i, 0-x);
}
#undef _mf_player_px
return e;
}
void
mf_player_destroy(struct mf_player **p_p)
{
struct mf_player *p;
if (p_p == NULL || *p_p == NULL) {
return;
}
p = *p_p;
free(p);
p = NULL;
}
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