feat: basic game structure w/ Ball physics & input handling

src/Game.cpp

@@ -0,0 +1,87 @@
+#include "Game.hpp"
+
+#include <SFML/Window/Event.hpp>
+
+#include "Ball.hpp"
+#include "Constants.hpp"
+#include "VectorMath.hpp"
+
+Game::Game() {
+    m_window.create(sf::VideoMode({Constants::WIDTH, Constants::HEIGHT}),
+                    "SFML Playground");
+    m_window.setVerticalSyncEnabled(true);
+    m_timeScale = 1.0f;
+    m_objects.clear();
+    m_objects.push_back(std::make_unique<Ball>(
+        Constants::BALL_RADIUS,
+        sf::Vector2f(Constants::WIDTH / 2.f, Constants::HEIGHT / 4.f),
+        sf::Vector2f(400.f, 0.f)));
+}
+
+void Game::processKeyPressed(const sf::Event::KeyPressed& keyPressed) {
+    if (keyPressed.code == sf::Keyboard::Key::Add ||
+        keyPressed.code == sf::Keyboard::Key::Equal) {
+        m_timeScale *= 1.1f;
+    } else if (keyPressed.code == sf::Keyboard::Key::Subtract ||
+               keyPressed.code == sf::Keyboard::Key::Hyphen) {
+        m_timeScale /= 1.1f;
+        if (m_timeScale < 0.1f) m_timeScale = 0.1f;
+    }
+}
+
+void Game::processMousePressed(
+    const sf::Event::MouseButtonPressed& mousePressed) {
+    if (mousePressed.button == sf::Mouse::Button::Left) {
+        handleMouseClick(
+            sf::Vector2i(mousePressed.position.x, mousePressed.position.y));
+    }
+}
+
+void Game::processEvents() {
+    while (const std::optional event = m_window.pollEvent()) {
+        if (event->is<sf::Event::Closed>()) {
+            m_window.close();
+            return;
+        }
+        if (auto kP = event->getIf<sf::Event::KeyPressed>())
+            processKeyPressed(*kP);
+        if (auto mP = event->getIf<sf::Event::MouseButtonPressed>())
+            processMousePressed(*mP);
+    }
+}
+
+void Game::handleMouseClick(const sf::Vector2i& mousePos) {
+    auto* ball = dynamic_cast<Ball*>(m_objects[0].get());
+    if (!ball) return;
+    sf::Vector2f ballPos = ball->getPosition();
+    sf::Vector2f mouseWorld(static_cast<float>(mousePos.x),
+                            static_cast<float>(mousePos.y));
+    sf::Vector2f dir = mouseWorld - ballPos;
+
+    dir = VectorMath::normalize(dir);
+
+    ball->applyImpulse(2000.f * dir);
+}
+
+void Game::update() {
+    float dt = m_clock.restart().asSeconds() * m_timeScale;
+    for (auto& object : m_objects) {
+        object->update(dt);
+    }
+}
+
+void Game::render() {
+    m_window.clear(sf::Color::Black);
+    for (auto& object : m_objects) {
+        object->draw(m_window);
+    }
+    m_window.display();
+}
+
+void Game::run() {
+    while (m_window.isOpen()) {
+        processEvents();
+        update();
+        render();
+    }
+}