21CSL66 Program 2

#include <GL/glut.h>
#include <stdio.h>

float squareX = 0.0f;
float squareY = 0.0f;
float squareSize = 0.2f;

void init()
{
    glClearColor(1.0, 1.0, 1.0, 1.0); // Set background color to white
    gluOrtho2D(-1.0, 1.0, -1.0, 1.0); // Set the clipping area
}

void drawSquare()
{
    glColor3f(0.0, 0.0, 0.0); // Set square color to black
    glBegin(GL_QUADS);
    glVertex2f(squareX, squareY);
    glVertex2f(squareX + squareSize, squareY);
    glVertex2f(squareX + squareSize, squareY + squareSize);
    glVertex2f(squareX, squareY + squareSize);
    glEnd();
}

void display()
{
    glClear(GL_COLOR_BUFFER_BIT); // Clear the color buffer
    glLoadIdentity(); // Load the identity matrix

    drawSquare();

    glFlush(); // Flush OpenGL buffer
}

void reshape(int width, int height)
{
    glViewport(0, 0, width, height); // Set the viewport to cover the new window
}

void keyboard(unsigned char key, int x, int y)
{
    switch (key)
    {
    case 'w':
        squareY += 0.05f; // Move square upwards
        break;
    case 's':
        squareY -= 0.05f; // Move square downwards
        break;
    case 'a':
        squareX -= 0.05f; // Move square to the left
        break;
    case 'd':
        squareX += 0.05f; // Move square to the right
        break;
    case 27:
        exit(0); // Exit program when 'Esc' key is pressed
        break;
    }
    glutPostRedisplay(); // Mark the current window for redisplay
}

int main(int argc, char** argv)
{
    glutInit(&argc, argv); // Initialize GLUT
    glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB); // Set display mode
    glutInitWindowSize(500, 500); // Set window size
    glutInitWindowPosition(100, 100); // Set window position
    glutCreateWindow("vtucode| Basic Geometric Operations"); // Create the window with the given title
    init(); // Initialize drawing
    glutDisplayFunc(display); // Register display callback function
    glutReshapeFunc(reshape); // Register reshape callback function
    glutKeyboardFunc(keyboard); // Register keyboard callback function
    glutMainLoop(); // Enter the main loop
    return 0;
}

braham@braham:~/Desktop/program$ g++ program2.cpp -lGL -lGLU -lglut -o program2
braham@braham:~/Desktop/program$ ./program2