Gatherer/enemy.cpp at master · Tyukhe/Gatherer · GitHub

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#include "enemy.h"
#include "math.h"

#define PI 3.14159265

Enemy::Enemy(sf::Vector2f newPos, sf::Vector2f newVel) :
    position(newPos), velocity(newVel), body(15.f, 64), eyeLeft(4.f, 64), eyeRight(4.f, 64), pupilLeft(1.5f), pupilRight(1.5f), m_vertices(sf::PrimitiveType::LineStrip, 40)
{
    body.setOrigin(body.getGeometricCenter());
    eyeLeft.setOrigin(eyeLeft.getGeometricCenter());
    eyeRight.setOrigin(eyeRight.getGeometricCenter());
    pupilLeft.setOrigin(pupilLeft.getGeometricCenter());
    pupilRight.setOrigin(pupilRight.getGeometricCenter());
    body.setFillColor(sf::Color::Red);
    body.setOutlineColor(sf::Color::Black);
    body.setOutlineThickness(3);
    body.setPosition(position);
    eyeLeft.setFillColor(sf::Color::White);
    eyeRight.setFillColor(sf::Color::White);
    eyeLeft.setPosition(position + sf::Vector2f(18.f, velocity.angle() - sf::degrees(25.f)));
    eyeRight.setPosition(position + sf::Vector2f(18.f, velocity.angle() + sf::degrees(25.f)));
    pupilLeft.setFillColor(sf::Color::Black);
    pupilRight.setFillColor(sf::Color::Black);
    pupilLeft.setPosition(position + sf::Vector2f(18.f, velocity.angle() - sf::degrees(25.f)) + sf::Vector2f(1.5f, velocity.angle()));
    pupilRight.setPosition(position + sf::Vector2f(18.f, velocity.angle() + sf::degrees(25.f)) + sf::Vector2f(1.5f, velocity.angle()));
}

bool Enemy::update(sf::Time elapsed, Player *player, std::vector<bullet>* bullets)
{
    position += velocity * elapsed.asSeconds();
    body.setPosition(position);
    if (velocity.length() != 0)
    {
        eyeLeft.setPosition(position + sf::Vector2f(18.f, velocity.angle() - sf::degrees(25.f)));
        eyeRight.setPosition(position + sf::Vector2f(18.f, velocity.angle() + sf::degrees(25.f)));
        pupilLeft.setPosition(position + sf::Vector2f(18.f, velocity.angle() - sf::degrees(25.f)) + sf::Vector2f(1.5f, (player->getCorePos() - position).angle()));
        pupilRight.setPosition(position + sf::Vector2f(18.f, velocity.angle() + sf::degrees(25.f)) + sf::Vector2f(1.5f, (player->getCorePos() - position).angle()));
    }
    if ((player->getCorePos() - position).length() > 500.f)
    {
        velocity = velocity.rotatedBy(velocity.angleTo(player->getCorePos() - position) * elapsed.asSeconds());
    } else
    {
        velocity = velocity - velocity * 0.9f * elapsed.asSeconds();
        for (int i = 0; i < 40; i++)
        {
            m_vertices[i].color = sf::Color::Red;
            m_vertices[i].position = position + sf::Vector2f(std::pow(std::pow((player->getCorePos() - position).length(), 2.f) - std::pow(176.5f, 2.f), 0.5f) / 40 * i, (player->getCorePos() - position).angle() + sf::degrees(((i % 2) - 0.5f) * 360.f * std::asin(176.5f / (player->getCorePos() - position).length()) / PI));
        }
        counter += 1;
        if (counter > (0.5f / elapsed.asSeconds()))
        {
            player->changeEnergy(-1);
            counter = 0.f;
        }
    }
    for (auto bul = bullets->begin(); bul != bullets->end(); bul++)
    {
        if ((position - bul->position).length() < 20.f)
        {
            bullets->erase(bul);
            return true;
        }
    }
    return false;
}

void Enemy::draw(sf::RenderTarget &target, sf::RenderStates states) const
{
    target.draw(body, states);
    target.draw(eyeLeft, states);
    target.draw(eyeRight, states);
    target.draw(pupilLeft, states);
    target.draw(pupilRight, states);
    target.draw(m_vertices, states);
}