Move the helloworld example into a subdirectory

[libs/gltk.git] / examples / helloworld.cpp

diff --git a/examples/helloworld.cpp b/examples/helloworld.cpp
new file mode 100644 (file)
index 0000000..4f85964
--- /dev/null
+++ b/examples/helloworld.cpp
@@ -0,0 +1,107 @@
+/*
+A simple graphical Hello World application implemented with mspgltk.
+Demonstrates some of the most common widget types.
+*/
+
+#include <msp/core/application.h>
+#include <msp/graphics/simplewindow.h>
+#include <msp/gl/blend.h>
+#include <msp/gl/matrix.h>
+#include <msp/gltk/button.h>
+#include <msp/gltk/entry.h>
+#include <msp/gltk/label.h>
+#include <msp/gltk/panel.h>
+#include <msp/gltk/resources.h>
+#include <msp/gltk/root.h>
+
+using namespace Msp;
+
+// Application class.  Because it's so much nicer than global variables.
+class HelloWorld: public Msp::RegisteredApplication<HelloWorld>
+{
+private:
+       // An OpenGL window to display our widgets in
+       Graphics::SimpleGLWindow wnd;
+
+       // GLtk resources and widgets
+       GLtk::Resources res;
+       GLtk::Root root;
+       GLtk::Entry *ent_name;
+       GLtk::Label *lbl_hello;
+
+public:
+       HelloWorld(int, char **);
+private:
+       virtual void tick();
+       void show_hello();
+};
+
+
+HelloWorld::HelloWorld(int, char **):
+       wnd(200, 200),
+       // Load resources.  This must be done before the root widget is created.
+       res("basic.skin"),
+       // A Root receives input from a Graphics::Window and passes it on
+       root(res, wnd)
+{
+       wnd.set_title("Hello World");
+       wnd.signal_close.connect(sigc::bind(sigc::mem_fun(this, &HelloWorld::exit), 0));
+
+       /* Container widgets will delete their contents upon destruction so we can
+       safely forget about the pointers after setting the widgets up. */
+
+       // Panels can be used to divide the window into sub-areas
+       GLtk::Panel *panel = new GLtk::Panel;
+       root.add(*panel);
+       panel->set_geometry(GLtk::Geometry(20, 20, 160, 160));
+
+       GLtk::Label *lbl;
+       // Prompts can be displayed with Labels
+       panel->add(*(lbl = new GLtk::Label("Type your name below:")));
+       lbl->set_geometry(GLtk::Geometry(10, 130, 140, 20));
+
+       // The user can type text into an Entry
+       panel->add(*(ent_name = new GLtk::Entry));
+       ent_name->set_geometry(GLtk::Geometry(10, 110, 140, 20));
+
+       GLtk::Button *btn;
+       // Buttons can be wired to cause things to happen
+       panel->add(*(btn = new GLtk::Button("Hello")));
+       btn->set_geometry(GLtk::Geometry(10, 85, 140, 20));
+       btn->signal_clicked.connect(sigc::mem_fun(this, &HelloWorld::show_hello));
+
+       // Another label for displaying some information
+       panel->add(*(lbl_hello = new GLtk::Label));
+       lbl_hello->set_geometry(GLtk::Geometry(10, 65, 140, 20));
+
+       // The user might want to exit the program (*gasp*)
+       panel->add(*(btn = new GLtk::Button("Exit")));
+       btn->set_geometry(GLtk::Geometry(50, 10, 100, 20));
+       btn->signal_clicked.connect(sigc::bind(sigc::mem_fun(this, &HelloWorld::exit), 0));
+
+       // Done with setting things up, show the window!
+       wnd.show();
+}
+
+// This function will be called periodically from the main loop
+void HelloWorld::tick()
+{
+       wnd.tick();
+
+       // Set up an orthogonal projection matching the root widget
+       GL::MatrixStack::projection() = GL::Matrix::ortho_bottomleft(200, 200);
+       GL::MatrixStack::modelview() = GL::Matrix();
+
+       // Font rendering requires blending
+       GL::Bind bind_blend(GL::Blend::alpha());
+
+       root.render();
+
+       wnd.swap_buffers();
+}
+
+// Displays a greeting to the user
+void HelloWorld::show_hello()
+{
+       lbl_hello->set_text("Hello, "+ent_name->get_text()+"!");
+}