Display "Hello World" Example

A very simple example using clanCore, clanApplication, clanDisplay and clanGL:

#include <ClanLib/core.h>
#include <ClanLib/display.h>
#include <ClanLib/gl.h>
#include <ClanLib/application.h>

class DisplayApplication : public CL_ClanApplication
{
public:
	int main(int argc, CL_String::char_type** argv);
};

// Create global application object:
// You MUST include this line or the application start-up will fail to
// locate your application object.
DisplayApplication app;

int DisplayApplication::main(int argc, CL_String::char_type** argv)
{
	// Setup clanlib modules:
	CL_SetupCore setup_core;
	CL_SetupDisplay setup_display;
	CL_SetupGL setup_gl;
	
	// Create a window:
	CL_DisplayWindow window(cl_text("Hello World"), 640, 480);
	
	// Retrieve some commonly used objects:
	CL_GraphicContext gc = window.get_gc();
	CL_InputDevice keyboard = window.get_ic().get_keyboard();
	CL_Font font(gc, cl_text("Tahoma"), 20);
	
	// Loop until user hits escape:
	while (!keyboard.get_keycode(CL_KEY_ESCAPE))
	{
		// Draw some text and lines:
		gc.clear(CL_Colord::cadetblue);
		gc.set_font(font);
		CL_Draw::line(gc, 0, 0, 640, 480, CL_Colord::yellow);
		gc.draw_text(10, 10, cl_text("Hello World!"), CL_Colord::lightseagreen);
		
		// Make the stuff visible:
		window.flip();
	
		// Read messages from the windowing system message queue,
		// if any are available:
		if (CL_DisplayMessageQueue::has_messages())
			CL_DisplayMessageQueue::process();
		
		// Avoid using 100% CPU in the loop:
		CL_System::sleep(10);
	}
	
	return 0;
}

To build this example with Visual C++:

1. Create a new Win32 project.
2. Add the source file to the project.
3. Change the threading model to Multithreaded Debug (or just Multithreaded for release builds) in the project settings' C/C++ Code Generation section.
4. Change the character set to Multi-Byte Character Set in the project settings General section, if you did not build the Unicode version of ClanLib.