#include "ConstantVelocity.h"

#include <raylib.h>


ConstantVelocitySystem::ConstantVelocitySystem()
{
    m_bullets.reserve(RESERVED);
}


void
ConstantVelocitySystem::update(const float dt)
{
    const int min_height = 0 - 3 * MARGIN;
    const int max_height = GetScreenHeight() + MARGIN;
    const int min_width = 0 - MARGIN;
    const int max_width = GetScreenWidth() + MARGIN;
    auto it = m_bullets.begin();
    while (it != m_bullets.end()) {
        auto& bullet = *it;
        bullet.position.x += bullet.velocity.x * dt;
        bullet.position.y += bullet.velocity.y * dt;
        const bool y_exceeded = bullet.position.y < min_height || bullet.position.y > max_height;
        const bool x_exceeded = bullet.position.x < min_width || bullet.position.x > max_width;
        if (y_exceeded || x_exceeded)
            it = m_bullets.erase(it);
        else
            ++it;
    }
}


void
ConstantVelocitySystem::draw()
{
    for (const auto& bullet : m_bullets)
        DrawCircle(bullet.position.x, bullet.position.y, bullet.radius, bullet.color);
}