added fps

src/Game.cpp

@@ -1,10 +1,12 @@
 #include <QPainter>
 #include "Game.h"
 #include "InputWindow.h"
+#include "Window.h"
 
 void Game::draw(QPixmap &output) {
 	QPainter p(&output);
 
+	p.drawText(50, 50, QString::fromStdString(std::to_string(int(window->currentFPS))));
 	for (auto & spectator : spectators)
 		spectator.draw(p);
 	player.draw(p);

src/Game.h

@@ -9,10 +9,12 @@
 #define GROUND_Y 400
 #define SPEC_Y 150
 
+class Window;
 class Game {
 	Player player;
 	std::vector<Spectator> spectators {5};
 public:
+	Window * window;
 	float eTime = 0;
 	static Game * instance;
 	static GameQueue * eventQueue;

src/Window.cpp

@@ -5,9 +5,9 @@ Window::Window() {
 	timer = new QTimer(this);
 	timer->setInterval(17);
 	connect(timer, &QTimer::timeout, this, [this]{
-		update();
 		game.update(17.f / 1000);
 	});
+	game.window = this;
 	timer->start();
 	label = new QLabel(this);
 	label->resize(size());
@@ -18,6 +18,12 @@ void Window::paintEvent(QPaintEvent *event) {
 	output.fill(Qt::white);
 	game.draw(output);
 	label->setPixmap(output.scaled(label->size()));
+	update();
+	auto now = std::chrono::high_resolution_clock::now();
+	auto diff = duration_cast<std::chrono::nanoseconds>((now - tp));
+	double seconds = double(diff.count()) / 1000. / 1000. / 1000. ;
+	currentFPS = 1 / seconds;
+	tp = now;
 }
 
 void Window::resizeEvent(QResizeEvent *e) {

src/Window.h

@@ -8,11 +8,15 @@
 #include "Game.h"
 #include <QLabel>
 
+using namespace std::chrono;
+
 class Window : public InputWindow {
 	Game game;
 	QLabel * label;
 	QTimer * timer;
+	time_point<system_clock, duration<double>> tp;
 public:
+	double currentFPS = 0;
 	explicit Window();
 protected:
 	void paintEvent(QPaintEvent *) override;