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#include "physics_body.h"
#include "game.h"
#include "consts.h"
void PhysicsBodyComponent::receive(Game&, Entity&, const Message& msg)
{
if (msg.type == Message::Type::walkLeft)
{
velocity.first = -90;
} else if (msg.type == Message::Type::walkRight)
{
velocity.first = 90;
} else if (msg.type == Message::Type::stopWalking)
{
velocity.first = 0.0;
} else if (msg.type == Message::Type::stopMovingHorizontally)
{
velocity.first = 0.0;
} else if (msg.type == Message::Type::stopMovingVertically)
{
velocity.second = 0.0;
}
}
void PhysicsBodyComponent::tick(Game&, Entity& entity, double dt)
{
// Accelerate
velocity.first += accel.first * dt;
velocity.second += accel.second * dt;
// Terminal velocity
#define TERMINAL_VELOCITY_X (2 * TILE_WIDTH * FRAMES_PER_SECOND)
#define TERMINAL_VELOCITY_Y (2 * TILE_HEIGHT * FRAMES_PER_SECOND)
if (velocity.first < -TERMINAL_VELOCITY_X) velocity.first = -TERMINAL_VELOCITY_X;
if (velocity.first > TERMINAL_VELOCITY_X) velocity.first = TERMINAL_VELOCITY_X;
if (velocity.second < -TERMINAL_VELOCITY_Y) velocity.second = -TERMINAL_VELOCITY_Y;
if (velocity.second > TERMINAL_VELOCITY_Y) velocity.second = TERMINAL_VELOCITY_Y;
// Do the movement
entity.position.first += velocity.first * dt;
entity.position.second += velocity.second * dt;
}
void PhysicsBodyComponent::detectCollision(Game& game, Entity& entity, Entity& collider, std::pair<double, double> old_position)
{
// If already colliding, do nothing!
if ((old_position.first + collider.size.first > entity.position.first)
&& (old_position.first < entity.position.first + entity.size.first)
&& (old_position.second + collider.size.second > entity.position.second)
&& (old_position.second < entity.position.second + entity.size.second))
{
return;
}
// If newly colliding, SHOCK AND HORROR!
if ((collider.position.first + collider.size.first > entity.position.first)
&& (collider.position.first < entity.position.first + entity.size.first)
&& (collider.position.second + collider.size.second > entity.position.second)
&& (collider.position.second < entity.position.second + entity.size.second))
{
Message msg(Message::Type::collision);
msg.collisionEntity = &collider;
entity.send(game, msg);
}
}
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