Add FLTK, gtkmm and imgui examples

Author: lefticus

fltk/README.md

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+Example FLTK code from http://www.fltk.org/doc-1.3/basics.html

fltk/test_fltk.cpp

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+#include <FL/Fl.H>
+#include <FL/Fl_Window.H>
+#include <FL/Fl_Box.H>
+#include <iostream>
+
+int main(int argc, char **argv) {
+ std::cout << "utf8 locale " << fl_utf8locale() << '\n';
+ Fl_Window *window = new Fl_Window(340,180);
+ Fl_Box *box = new Fl_Box(20,40,300,100, "Hello World" );
+ box->box(FL_UP_BOX);
+ box->labelfont(FL_BOLD+FL_ITALIC);
+ box->labelsize(32);
+ box->labeltype(FL_SHADOW_LABEL);
+ window->end();
+ window->show(argc, argv);
+ return Fl::run();
+}
+
+
+

gtkmm/README.md

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+Example Hello World from https://developer.gnome.org/gtkmm-tutorial/stable/sec-helloworld.html.en

gtkmm/hello_world.cpp

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+#include "hello_world.hpp"
+#include <iostream>
+
+HelloWorld::HelloWorld()
+ : m_button("Hello World") // creates a new button with label "Hello World".
+{
+ // Sets the border width of the window.
+ set_border_width(10);
+
+ // When the button receives the "clicked" signal, it will call the
+ // on_button_clicked() method defined below.
+ m_button.signal_clicked().connect(sigc::mem_fun(*this,
+ &HelloWorld::on_button_clicked));
+
+ // This packs the button into the Window (a container).
+ add(m_button);
+
+ // The final step is to display this newly created widget...
+ m_button.show();
+}
+
+
+void HelloWorld::on_button_clicked()
+{
+ std::cout << "Hello World\n";
+}
+

gtkmm/hello_world.hpp

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+#ifndef GTKMM_EXAMPLE_HELLO_WORLD_HPP
+#define GTKMM_EXAMPLE_HELLO_WORLD_HPP
+
+#include <gtkmm/button.h>
+#include <gtkmm/window.h>
+
+class HelloWorld : public Gtk::Window
+{
+
+public:
+ HelloWorld();
+
+protected:
+ //Signal handlers:
+ void on_button_clicked();
+
+ //Member widgets:
+ Gtk::Button m_button;
+};
+
+#endif // GTKMM_EXAMPLE_HELLO_WORLD_HPP
+

gtkmm/main.cpp

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+#include "hello_world.hpp"
+#include <gtkmm/application.h>
+
+int main (int argc, char *argv[])
+{
+ auto app = Gtk::Application::create(argc, argv, "org.gtkmm.example");
+
+ HelloWorld helloworld;
+
+ //Shows the window and returns when it is closed.
+ return app->run(helloworld);
+}
+

imgui/README.md

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+Example of using imgui with SFML from https://github.com/eliasdaler/imgui-sfml

imgui/imconfig.h

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+#include <SFML/System/Vector2.hpp>
+#include <SFML/Graphics/Color.hpp>
+
+#define IM_VEC2_CLASS_EXTRA \
+ template <typename T> \
+ ImVec2(const sf::Vector2<T>& v) { \
+ x = static_cast<float>(v.x); \
+ y = static_cast<float>(v.y); \
+ } \
+ \
+ template <typename T> \
+ operator sf::Vector2<T>() const { \
+ return sf::Vector2<T>(x, y); \
+ }
+
+#define IM_VEC4_CLASS_EXTRA \
+ ImVec4(const sf::Color & c) \
+ : ImVec4(c.r / 255.f, c.g / 255.f, c.b / 255.f, c.a / 255.f) { \
+ } \
+ operator sf::Color() const { \
+ return sf::Color(static_cast<sf::Uint8>(x * 255.f), \
+ static_cast<sf::Uint8>(y * 255.f), \
+ static_cast<sf::Uint8>(z * 255.f), \
+ static_cast<sf::Uint8>(w * 255.f)); \
+ }