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#include "transform_system.h"
#include "game.h"
#include "map.h"
void TransformSystem::initSprite(int spriteId, vec2i loc, SpriteLayer layer) {
Sprite& sprite = game_.getSprite(spriteId);
sprite.loc = loc;
sprite.layer = layer;
spritesByY_[static_cast<size_t>(layer)].emplace(loc.y(), spriteId);
}
void TransformSystem::setUpCollision(int spriteId, vec2i offset, vec2i size, bool solid) {
Sprite& sprite = game_.getSprite(spriteId);
sprite.collidable = true;
sprite.collisionOffset = offset;
sprite.collisionSize = size;
sprite.solid = solid;
addCollidable(spriteId);
}
void TransformSystem::moveSprite(int spriteId, vec2i newLoc) {
Sprite& sprite = game_.getSprite(spriteId);
if (sprite.collidable) {
removeCollidable(spriteId);
}
bool changedY = (sprite.loc.y() != newLoc.y());
if (changedY) {
spritesByY_[static_cast<size_t>(sprite.layer)].erase(std::make_tuple(sprite.loc.y(), spriteId));
}
sprite.loc = newLoc;
if (changedY) {
spritesByY_[static_cast<size_t>(sprite.layer)].emplace(newLoc.y(), spriteId);
}
if (sprite.collidable) {
addCollidable(spriteId);
}
}
CollisionResult TransformSystem::checkCollision(int spriteId, vec2i newLoc, Direction dir) {
CollisionResult result;
Sprite& sprite = game_.getSprite(spriteId);
const Map& map = game_.getMap();
bool blocked = false;
vec2i mapBounds = map.getMapSize() * map.getTileSize();
vec2i oldColUL = sprite.loc + sprite.collisionOffset;
vec2i oldColDR = oldColUL + sprite.collisionSize;
vec2i newColUL = newLoc + sprite.collisionOffset;
vec2i newColDR = newColUL + sprite.collisionSize;
vec2i oldTileUL = oldColUL / map.getTileSize();
vec2i newTileUL = newColUL / map.getTileSize();
vec2i oldTileDR = oldColDR / map.getTileSize();
vec2i newTileDR = newColDR / map.getTileSize();
if (dirHasDir(sprite.dir, Direction::right)) {
if (newTileDR.x() > oldTileDR.x() &&
newColDR.x() < mapBounds.w()) {
for (int y = newTileUL.y(); y <= newTileDR.y(); y++) {
if (map.isBlocked(newTileDR.x(), y)) {
result.horiz.blocked = true;
result.horiz.dir = Direction::right;
break;
}
}
}
if (!result.horiz.blocked) {
auto it = rightCollidables_.lower_bound({oldColDR.x(), INT_MAX});
for (;
(it != std::end(rightCollidables_) &&
std::get<0>(it->first) <= newColDR.x());
it++) {
if (newColDR.y() >= it->second.lower &&
newColUL.y() <= it->second.upper) {
int colliderSpriteId = std::get<1>(it->first);
Sprite& collider = game_.getSprite(colliderSpriteId);
result.horiz.blocked = collider.solid;
result.horiz.dir = Direction::right;
result.horiz.colliderSprite = colliderSpriteId;
break;
}
}
}
}
if (dirHasDir(sprite.dir, Direction::left)) {
if (newTileUL.x() < oldTileUL.x() &&
newColUL.x() >= 0) {
for (int y = newTileUL.y(); y <= newTileDR.y(); y++) {
if (map.isBlocked(newTileUL.x(), y)) {
result.horiz.blocked = true;
result.horiz.dir = Direction::left;
break;
}
}
}
if (!result.horiz.blocked) {
auto it = leftCollidables_.lower_bound({oldColUL.x(), 0});
for (;
(it != std::end(leftCollidables_) &&
std::get<0>(it->first) >= newColUL.x());
it++) {
if (newColDR.y() >= it->second.lower &&
newColUL.y() <= it->second.upper) {
int colliderSpriteId = std::get<1>(it->first);
Sprite& collider = game_.getSprite(colliderSpriteId);
result.horiz.blocked = collider.solid;
result.horiz.dir = Direction::left;
result.horiz.colliderSprite = colliderSpriteId;
break;
}
}
}
}
if (dirHasDir(sprite.dir, Direction::down)) {
if (newTileDR.y() > oldTileDR.y() &&
newColDR.y() < mapBounds.h()) {
for (int x = newTileUL.x(); x <= newTileDR.x(); x++) {
if (map.isBlocked(x, newTileDR.y())) {
result.vert.blocked = true;
result.vert.dir = Direction::down;
break;
}
}
}
if (!result.vert.blocked) {
auto it = downCollidables_.lower_bound({oldColDR.y(), INT_MAX});
for (;
(it != std::end(downCollidables_) &&
std::get<0>(it->first) <= newColDR.y());
it++) {
if (newColDR.x() >= it->second.lower &&
newColUL.x() <= it->second.upper) {
int colliderSpriteId = std::get<1>(it->first);
Sprite& collider = game_.getSprite(colliderSpriteId);
result.vert.blocked = collider.solid;
result.vert.dir = Direction::down;
result.vert.colliderSprite = colliderSpriteId;
break;
}
}
}
}
if (dirHasDir(sprite.dir, Direction::up)) {
if (newTileUL.y() < oldTileUL.y() &&
newColUL.y() >= 0) {
for (int x = newTileUL.x(); x <= newTileDR.x(); x++) {
if (map.isBlocked(x, newTileUL.y())) {
result.vert.blocked = true;
result.vert.dir = Direction::up;
break;
}
}
}
if (!result.vert.blocked) {
auto it = upCollidables_.lower_bound({oldColUL.y(), 0});
for (;
(it != std::end(upCollidables_) &&
std::get<0>(it->first) >= newColUL.y());
it++) {
if (newColDR.x() >= it->second.lower &&
newColUL.x() <= it->second.upper) {
int colliderSpriteId = std::get<1>(it->first);
Sprite& collider = game_.getSprite(colliderSpriteId);
result.vert.blocked = collider.solid;
result.vert.dir = Direction::up;
result.vert.colliderSprite = colliderSpriteId;
break;
}
}
}
}
return result;
}
void TransformSystem::addCollidable(int spriteId) {
Sprite& sprite = game_.getSprite(spriteId);
vec2i colUL = sprite.loc + sprite.collisionOffset;
vec2i colDR = colUL + sprite.collisionSize;
leftCollidables_.emplace(std::piecewise_construct, std::tie(colDR.x(), spriteId), std::tie(colUL.y(), colDR.y()));
rightCollidables_.emplace(std::piecewise_construct, std::tie(colUL.x(), spriteId), std::tie(colUL.y(), colDR.y()));
upCollidables_.emplace(std::piecewise_construct, std::tie(colDR.y(), spriteId), std::tie(colUL.x(), colDR.x()));
downCollidables_.emplace(std::piecewise_construct, std::tie(colUL.y(), spriteId), std::tie(colUL.x(), colDR.x()));
}
void TransformSystem::removeCollidable(int spriteId) {
Sprite& sprite = game_.getSprite(spriteId);
vec2i colUL = sprite.loc + sprite.collisionOffset;
vec2i colDR = colUL + sprite.collisionSize;
leftCollidables_.erase({ colDR.x(), spriteId });
rightCollidables_.erase({ colUL.x(), spriteId });
upCollidables_.erase({ colDR.y(), spriteId });
downCollidables_.erase({ colUL.y(), spriteId });
}
void TransformSystem::destroySprite(int spriteId) {
Sprite& sprite = game_.getSprite(spriteId);
spritesByY_[static_cast<size_t>(sprite.layer)].erase(std::make_tuple(sprite.loc.y(), spriteId));
if (sprite.collidable) {
removeCollidable(spriteId);
}
}
void TransformSystem::clearSpriteCache() {
for (auto& layer : spritesByY_) {
layer.clear();
}
leftCollidables_.clear();
rightCollidables_.clear();
upCollidables_.clear();
downCollidables_.clear();
}
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