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/**
* @file physics.cpp
*
* Copyright (C) 2019 Belle-Isle, Andrew <drumsetmonkey@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/>.
*/
#include "physics.hpp"
#include "components/Physics.hpp"
#include "components/Position.hpp"
#include "components/Velocity.hpp"
void PhysicsSystem::configure([[maybe_unused]]entityx::EntityManager& entities,
[[maybe_unused]]entityx::EventManager& events)
{
events.subscribe<WorldChangeEvent>(*this);
}
void PhysicsSystem::update([[maybe_unused]]entityx::EntityManager& entities,
[[maybe_unused]]entityx::EventManager& events,
[[maybe_unused]]entityx::TimeDelta dt)
{
entities.each<Position, Velocity>
([this, dt](entityx::Entity e, Position &pos, Velocity &vel){
bool has_phys = e.has_component<Physics>();
pos.x += (vel.x * dt/1000.0);
pos.y += (vel.y * dt/1000.0);
// TODO make this intersect world instead of 0 y
if (has_phys) {
double fallPosition = currentWorld->getHeight(pos.x, pos.y, 0.0);
Physics *p = e.component<Physics>().get();
// TODO only make this occur when the entity has a hitbox
if (pos.y == fallPosition) {
p->standing = true;
return;
}
if (pos.y < fallPosition) {
pos.y = fallPosition;
vel.y = 0;
p->standing = true;
} else {
p->standing = false;
vel.y -= 32.2 * (dt/1000.0f);
}
}
});
}
void PhysicsSystem::receive(const WorldChangeEvent& wce)
{
currentWorld = wce.newWorld;
}
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