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/* SPDX-License-Identifier: MIT */
/*
* konrpg.c
*
* Copyright (c) 2026 KonAki
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include "konrpg.h"
/*** directions ***/
void kon_dirDelta(kon_dir_t dir, int *dx, int *dy)
{
*dx = 0;
*dy = 0;
switch (dir) {
case KON_DIR_DOWN: *dy = 1; break;
case KON_DIR_LEFT: *dx = -1; break;
case KON_DIR_RIGHT: *dx = 1; break;
case KON_DIR_UP: *dy = -1; break;
}
}
kon_dir_t kon_dirOpposite(kon_dir_t dir)
{
switch (dir) {
case KON_DIR_DOWN: return KON_DIR_UP;
case KON_DIR_LEFT: return KON_DIR_RIGHT;
case KON_DIR_RIGHT: return KON_DIR_LEFT;
case KON_DIR_UP: break;
}
return KON_DIR_DOWN;
}
/*** actors ***/
void kon_actorInit(kon_actor_t *actor, int column, int row, kon_dir_t facing)
{
kon_actor_t zero = {0};
*actor = zero;
actor->column = actor->fromColumn = column;
actor->row = actor->fromRow = row;
actor->facing = facing;
actor->progress = 1.0f;
actor->speed = 4.0f;
}
int kon_actorWalk(kon_actor_t *actor, const kon_tilemap_t *map, const uint8_t *solid, int solidCount, kon_dir_t dir, kon_blockFn blocked, void *user)
{
int dx, dy, column, row, id;
if (!map || actor->moving) return 0;
actor->facing = dir;
kon_dirDelta(dir, &dx, &dy);
column = actor->column + dx;
row = actor->row + dy;
if (column < 0 || row < 0 || column >= map->columns || row >= map->rows) return 0;
id = kon_tilemapAt(map, column, row);
if (solid && id < solidCount && solid[id]) return 0;
if (blocked && blocked(column, row, user)) return 0;
actor->fromColumn = actor->column;
actor->fromRow = actor->row;
actor->column = column;
actor->row = row;
actor->moving = 1;
actor->progress = actor->carry * actor->speed;
if (actor->progress >= 1.0f) actor->progress = 0.999f;
actor->carry = 0.0f;
return 1;
}
int kon_actorUpdate(kon_actor_t *actor, float dt)
{
if (!actor->moving) {
actor->carry = 0.0f;
return 0;
}
if (!(dt > 0.0f) || !(actor->speed > 0.0f)) return 0;
actor->progress += actor->speed * dt;
if (actor->progress < 1.0f) return 0;
actor->carry = (actor->progress - 1.0f) / actor->speed;
actor->progress = 1.0f;
actor->moving = 0;
return 1;
}
void kon_actorPixel(const kon_actor_t *actor, const kon_tilemap_t *map, float *x, float *y)
{
float t = actor->moving ? actor->progress : 1.0f;
float fromX = (float)(actor->fromColumn * map->tileWidth), fromY = (float)(actor->fromRow * map->tileHeight);
float toX = (float)(actor->column * map->tileWidth), toY = (float)(actor->row * map->tileHeight);
*x = fromX + (toX - fromX) * t;
*y = fromY + (toY - fromY) * t;
}
void kon_actorFront(const kon_actor_t *actor, int *column, int *row)
{
int dx, dy;
kon_dirDelta(actor->facing, &dx, &dy);
*column = actor->column + dx;
*row = actor->row + dy;
}
/*** events ***/
int kon_eventAt(const kon_tileEvent_t *events, int count, int column, int row, int trigger)
{
int i;
for (i = 0; i < count; i++) {
if (events[i].column != column || events[i].row != row) continue;
if (trigger >= 0 && (int)events[i].trigger != trigger) continue;
return i;
}
return -1;
}
int kon_eventBlocks(int column, int row, void *user)
{
const kon_eventList_t *list = user;
int i;
for (i = 0; i < list->count; i++) {
if (list->events[i].blocks && list->events[i].column == column && list->events[i].row == row) return 1;
}
return 0;
}
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