pacman/lib/Game.cpp

#include "Game.hpp"

#include <chrono>

Game::Game()
  : pacMan(board),
    pellets(board),
    superPellets(board) {}

auto Game::now() {
  return std::chrono::system_clock::now();
}

void Game::run() {

    const std::chrono::milliseconds delta_time (1000/60);

    std::chrono::milliseconds t(0);
    std::chrono::milliseconds accumulator(0);
    auto current_time = now();

    InputState inputState;

    while (true) {
        auto newTime = now();
        auto frameTime = std::chrono::duration_cast<std::chrono::milliseconds>(newTime - current_time);
        current_time = newTime;
        accumulator += frameTime;
        processEvents(inputState);
        if(inputState.close)
            return;
        while ( accumulator >= delta_time ) {
            pacMan.update(delta_time, inputState, board);
            eatPellets();
            accumulator -= delta_time;
            t += delta_time;
        }
        canvas.update(pacMan, pellets, superPellets);
    }
}

void Game::eatPellets() {
  const auto pos = pacMan.positionInGrid();
  pellets.eatPelletAtPosition(pos);
  superPellets.eatPelletAtPosition(pos);
}

void Game::processEvents(InputState & inputState) {

  auto event = canvas.pollEvent();
  if (event && event->type == sf::Event::Closed) {
    inputState.close = true;
    return;
  }

  inputState.down = inputState.up = inputState.left = inputState.right = false;

  inputState.down = sf::Keyboard::isKeyPressed(sf::Keyboard::Key::Down);
  inputState.up = sf::Keyboard::isKeyPressed(sf::Keyboard::Key::Up);
  inputState.left = sf::Keyboard::isKeyPressed(sf::Keyboard::Key::Left);
  inputState.right = sf::Keyboard::isKeyPressed(sf::Keyboard::Key::Right);
}