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One need the compiled library and the header file with the interface for usage. Besides of this, GLEW and GLFW3 are used in the example below to load the OpenGL functions and to create a window.

#include <GL/glew.h>
#include <GLFW/glfw3.h>
#include <iostream>
#include "eyeGUI.h"

// Callback to receive information from eyeGUI
void printCallback(std::string message)
{
	std::cout << message << std::endl;
}

// Main function
int main()
{
	// Window and OpenGL initialization
	glfwInit();
	GLFWwindow* window = glfwCreateWindow(1280, 720, "eyeGUI", NULL, NULL);
	glfwMakeContextCurrent(window);
	glewInit();

	// Set callbacks
	eyegui::setErrorCallback(&printCallback);
	eyegui::setWarningCallback(&printCallback);

	// Create GUI
	eyegui::GUIBuilder guiBuilder;
	guiBuilder.width = 1280;
	guiBuilder.height = 720;
	eyegui::GUI* pGUI = guiBuilder.construct();

	// Add simple layout from harddisk
	eyegui::Layout* pLayout = eyegui::addLayout(pGUI, "HelloLayout.xeyegui");

	// Prepare delta time calculation
	float lastTime, deltaTime;
	lastTime = (float)glfwGetTime();

	// Main loop
	while (!glfwWindowShouldClose(window))
	{
		// Calculate delta time per frame
		float currentTime = (float)glfwGetTime();
		deltaTime = currentTime - lastTime;
		lastTime = currentTime;

		// Clearing of buffers
		glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

		// Get current mouse cursor position and give it to eyeGUI as gaze
		double x, y;
		glfwGetCursorPos(window, &x, &y);
		eyegui::Input input;
		input.gazeX = x;
		input.gazeY = y;

		// Update GUI
		eyegui::Input usedInput = eyegui::updateGUI(pGUI, deltaTime, input);

		// "usedInput" can be piped to content behind the user interface

		// Draw GUI
		eyegui::drawGUI(pGUI);

		// Swap front and back buffers and poll events
		glfwSwapBuffers(window);
		glfwPollEvents();
	}

	// Delete GUI object
	eyegui::terminateGUI(pGUI);

	// Termination of program
	glfwTerminate();
	return 0;
}

The example layout in "HelloLayout.xeyegui" listed below.

<?xml version="1.0"?>
<layout>
	<circlebutton></circlebutton>
</layout>

The program should compile if linked correctly and display a circular, window filling button with a red cross as icon.

Further Reading

1. Layouts
2. Elements
3. Notifications
4. Manipulation
5. Configuration
6. Styling
7. Bricks
8. Frames
9. Localization
10. Keyboard
11. Tips
12. Examples

All interface functions are documented in the header file itself.