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#include <attack.hpp>
#include <components.hpp>
#include <engine.hpp>
#include <particle.hpp>
constexpr int shortSlashLength = 100;
constexpr int longSlashLength = 200;
// math helpers because we don't trust stdlib
template<typename T>
inline T abs(const T& n) {
static_assert(std::is_arithmetic<T>::value, "abs expects numbers");
return n >= 0 ? n : -n;
}
void AttackSystem::receive(const AttackEvent& ae)
{
attacks.emplace_front(ae);
}
void AttackSystem::update(entityx::EntityManager& en, entityx::EventManager& ev, entityx::TimeDelta dt)
{
(void)en;
(void)ev;
(void)dt;
for (const auto& a : attacks) {
switch (a.type) {
case AttackType::ShortSlash:
en.each<Position, Solid, Health>(
[&a](entityx::Entity e, Position& pos, Solid& dim, Health& h) {
(void)e;
if (e.has_component<Player>())
return;
vec2 eloc (pos.x + dim.width / 2, pos.y + dim.height / 2);
if (abs(eloc.x - a.pos.x) <= shortSlashLength) {
h.health -= a.power;
game::engine.getSystem<ParticleSystem>()->addMultiple(10, ParticleType::SmallBlast,
[&](){ return eloc; }, 500, 7);
}
}
);
break;
case AttackType::LongSlash:
break;
default:
break;
}
}
attacks.clear();
}
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