Hello and I wanted to ask you, if you could help me with my tilemap-collision problem i have.
I don't know what i have done wrong, but the collision on the x axis doesn't work.Please help me !!!!
I took this from the "SFML Game Development by example" book.
Here is the collision checking:
Checkcollision:
void EntityBase::CheckCollisions() {
Map* gameMap = m_gamemap;
unsigned int tileSize = gameMap->GetTileSize();
int fromX = floor(m_AABB.left / tileSize);
int toX = floor((m_AABB.left + m_AABB.width) / tileSize);
int fromY = floor(m_AABB.top / tileSize);
int toY = floor((m_AABB.top + m_AABB.height) / tileSize);
for (int x = fromX; x <= toX; ++x) {
for (int y = fromY; y <= toY; ++y) {
Tile* tile = gameMap->GetTile(x, y);
if (!tile) { continue; }
sf::FloatRect tileBounds(x * tileSize, y * tileSize, tileSize, tileSize);
sf::FloatRect intersection;
m_AABB.intersects(tileBounds, intersection);
float area = intersection.width * intersection.height;
CollisionElement e(area, tile->properties, tileBounds);
m_collisions.emplace_back(e);
std::cout << m_collisions.size() << std::endl;
}
}
}
Resolving it:
void EntityBase::ResolveCollisions() {
if (!m_collisions.empty()) {
std::sort(m_collisions.begin(), m_collisions.end(), SortCollisions);
Map* gameMap = m_gamemap;
unsigned int tileSize = gameMap->GetTileSize();
for (auto &itr : m_collisions) {
float xDiff = (m_AABB.left + (m_AABB.width / 2)) - (itr.m_tileBounds.left + (itr.m_tileBounds.width / 2));
float yDiff = (m_AABB.top + (m_AABB.height / 2)) - (itr.m_tileBounds.top + (itr.m_tileBounds.height / 2));
float resolve = 0;
if (abs(xDiff) > abs(yDiff)) {
if (xDiff > 0) {
resolve = (itr.m_tileBounds.left + tileSize) - m_AABB.left;
}
else {
resolve = -((m_AABB.left + m_AABB.width) - itr.m_tileBounds.left);
}
Move(resolve, 0);
m_velocity.x = 0;
m_collidingOnX = true;
}
else {
if (yDiff > 0) {
resolve = (itr.m_tileBounds.top + tileSize) - m_AABB.top;
}
else {
resolve = -((m_AABB.top + m_AABB.height) - itr.m_tileBounds.top);
}
Move(0, resolve);
m_velocity.y = 0;
if (m_collidingOnY) { continue; }
m_referenceTile = itr.m_tile;
m_collidingOnY = true;
}
}
m_collisions.clear();
}
if (!m_collidingOnY) { m_referenceTile = nullptr; }
}
//m_AABB is the player's floatrect
hope you can help me thanks.
