breakhack/src/camera.c

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/*
* BreakHack - A dungeone crawler RPG
* Copyright (C) 2018 Linus Probert <linus.probert@gmail.com>
*
* This program 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.
*
* This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
*/
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#include "camera.h"
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#include "map.h"
#include "util.h"
#include "random.h"
// Preserve a link for global access
// See: TODO in camera_shake(void)
static Camera *gCamera = NULL;
Camera *camera_create(SDL_Renderer *renderer)
{
gCamera = ec_malloc(sizeof(Camera));
gCamera->renderer = renderer;
gCamera->shakeTimer = _timer_create();
gCamera->velocity = VECTOR2D_NODIR;
gCamera->pos = (Position) { 0, 0 };
gCamera->basePos = (Position) { 0, 0 };
return gCamera;
}
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Position camera_to_camera_position(Camera *cam, Position *pos)
{
return (Position) {
pos->x - cam->pos.x,
pos->y - cam->pos.y
};
}
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void camera_follow_position(Camera *cam, Position *pos)
{
int room_width, room_height;
Position newPos = { 0, 0 };
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room_width = MAP_ROOM_WIDTH * TILE_DIMENSION;
room_height = MAP_ROOM_HEIGHT * TILE_DIMENSION;
if (pos->x <= 0)
newPos.x = 0;
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else if (pos->x >= room_width * MAP_H_ROOM_COUNT)
newPos.x = room_width * (MAP_H_ROOM_COUNT - 1);
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else
newPos.x = pos->x - (pos->x % room_width);
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if (pos->y <= 0)
newPos.y = 0;
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else if (pos->y >= room_height * MAP_V_ROOM_COUNT)
newPos.y = room_height * (MAP_V_ROOM_COUNT - 1);
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else
newPos.y = pos->y - (pos->y % room_height);
cam->basePos = newPos;
if (!timer_started(cam->shakeTimer))
cam->pos = newPos;
}
void
camera_destroy(Camera *camera)
{
timer_destroy(camera->shakeTimer);
free(camera);
}
void
camera_update(Camera *camera, float deltatime)
{
if (!timer_started(camera->shakeTimer))
return;
if (timer_get_ticks(camera->shakeTimer) > 60) {
camera->pos = camera->basePos;
timer_stop(camera->shakeTimer);
return;
} else if (timer_get_ticks(camera->shakeTimer) > 20) {
camera->pos = camera->basePos;
camera->velocity.x *= -1;
camera->velocity.y *= -1;
}
camera->pos.x += (int) (camera->velocity.x * deltatime);
camera->pos.y += (int) (camera->velocity.y * deltatime);
}
void
camera_shake(Vector2d dir, int intensity)
{
// TODO(Linus): This isn't great. If we ever need more cameras this
// needs to be rethought.
if (gCamera == NULL)
return;
if (timer_started(gCamera->shakeTimer))
return;
timer_start(gCamera->shakeTimer);
gCamera->velocity = dir;
gCamera->velocity.x *= (float) intensity;
gCamera->velocity.y *= (float) intensity;
gCamera->basePos = gCamera->pos;
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}