simple-cpp-game-study/sfmldemo/main.cpp

#include "imgui.h"
#include "imgui-SFML.h"
#include <fmt/core.h>

#include <SFML/Graphics/CircleShape.hpp>
#include <SFML/Graphics/RenderWindow.hpp>
#include <SFML/System/Clock.hpp>
#include <SFML/Window/Event.hpp>

int main() {
  fmt::print("Setting up a window for you...\n");

  sf::RenderWindow window(sf::VideoMode(1920, 1080), "ImGui + SFML = <3");
  // window.setFramerateLimit(60);
  window.setVerticalSyncEnabled(true);
  int res = ImGui::SFML::Init(window);
  if(res == 1) {
    fmt::print("ImGui returned result {}\n", res);
  } else {
    fmt::print("ImGui returned an error code={}\n", res);
    return -1;
  }

  sf::CircleShape shape(100.f);
  shape.setFillColor(sf::Color::Green);

  sf::Clock deltaClock;
  while (window.isOpen()) {
    sf::Event event;
    while (window.pollEvent(event)) {
      ImGui::SFML::ProcessEvent(window, event);

      if (event.type == sf::Event::Closed) {
        fmt::print("Exiting...\n");
        window.close();
      }
    }

    ImGui::SFML::Update(window, deltaClock.restart());

    ImGui::ShowDemoWindow();

    ImGui::Begin("Hello, world!");
    ImGui::Button("Look at this pretty button");
    ImGui::End();

    window.clear();
    window.draw(shape);
    ImGui::SFML::Render(window);
    window.display();
  }

  ImGui::SFML::Shutdown();
}