116 lines
3.0 KiB
C
116 lines
3.0 KiB
C
/*
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* BreakHack - A dungeone crawler RPG
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* Copyright (C) 2018 Linus Probert <linus.probert@gmail.com>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "camera.h"
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#include "map.h"
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#include "util.h"
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#include "random.h"
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// Preserve a link for global access
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// See: TODO in camera_shake(void)
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static Camera *gCamera = NULL;
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Camera *camera_create(SDL_Renderer *renderer)
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{
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gCamera = ec_malloc(sizeof(Camera));
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gCamera->renderer = renderer;
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gCamera->shakeTimer = _timer_create();
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gCamera->velocity = VECTOR2D_NODIR;
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gCamera->pos = (Position) { 0, 0 };
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gCamera->basePos = (Position) { 0, 0 };
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return gCamera;
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}
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Position camera_to_camera_position(Camera *cam, Position *pos)
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{
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return (Position) {
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pos->x - cam->pos.x,
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pos->y - cam->pos.y
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};
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}
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void camera_follow_position(Camera *cam, Position *pos)
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{
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int room_width, room_height;
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Position newPos = { 0, 0 };
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room_width = MAP_ROOM_WIDTH * TILE_DIMENSION;
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room_height = MAP_ROOM_HEIGHT * TILE_DIMENSION;
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if (pos->x <= 0)
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newPos.x = 0;
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else if (pos->x >= room_width * MAP_H_ROOM_COUNT)
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newPos.x = room_width * (MAP_H_ROOM_COUNT - 1);
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else
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newPos.x = pos->x - (pos->x % room_width);
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if (pos->y <= 0)
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newPos.y = 0;
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else if (pos->y >= room_height * MAP_V_ROOM_COUNT)
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newPos.y = room_height * (MAP_V_ROOM_COUNT - 1);
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else
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newPos.y = pos->y - (pos->y % room_height);
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cam->basePos = newPos;
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if (!timer_started(cam->shakeTimer))
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cam->pos = newPos;
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}
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void
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camera_destroy(Camera *camera)
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{
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timer_destroy(camera->shakeTimer);
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free(camera);
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}
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void
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camera_update(Camera *camera, float deltatime)
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{
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if (!timer_started(camera->shakeTimer))
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return;
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if (timer_get_ticks(camera->shakeTimer) > 60) {
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camera->pos = camera->basePos;
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timer_stop(camera->shakeTimer);
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return;
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} else if (timer_get_ticks(camera->shakeTimer) > 20) {
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camera->pos = camera->basePos;
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camera->velocity.x *= -1;
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camera->velocity.y *= -1;
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}
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camera->pos.x += (int) (camera->velocity.x * deltatime);
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camera->pos.y += (int) (camera->velocity.y * deltatime);
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}
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void
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camera_shake(Vector2d dir, int intensity)
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{
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// TODO(Linus): This isn't great. If we ever need more cameras this
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// needs to be rethought.
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if (gCamera == NULL)
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return;
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if (timer_started(gCamera->shakeTimer))
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return;
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timer_start(gCamera->shakeTimer);
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gCamera->velocity = dir;
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gCamera->velocity.x *= (float) intensity;
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gCamera->velocity.y *= (float) intensity;
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gCamera->basePos = gCamera->pos;
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}
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