translation leading to checkers pattern

checkersTranslated.cpp

/** GL02Primitive.cpp: Vertex, Primitive and Color* Draw Simple 2D colored Shapes: quad, triangle and polygon.*/
#include <windows.h> // for MS Windows
#include <GL/glut.h> // GLUT, include glu.h and gl.h/* Initialize OpenGL Graphics */
void initGL() { 

	glMatrixMode(GL_PROJECTION); 
	glLoadIdentity(); 
	gluOrtho2D(0.0, 1000.0, 0.0, 1000.0); 
	glViewport(0,0,1000,1000);
	glClearColor(1.0f, 1.0f, 1.0f, 1.0f); // Black and opaque
	
}
 
 /* Handler for window-repaint event. Call back when the window first appears andwhenever the window needs to be re-painted. */
 
void display() {
	glClear(GL_COLOR_BUFFER_BIT); // Clear the color buffer with current clearing color
	glLineWidth(4.0);
	GLdouble x,y;
	
	// to support translation, scaling and transformation
	// use the GL_MODELVIEW Matrix
	glMatrixMode(GL_MODELVIEW); // To operate on Model-View matrix
	glLoadIdentity(); // Reset the model-view matrix
	GLint colorCode = 1;
 
	for (y=0.0;y<=1000.0;y=y+50.0) {
		
		for (x=0.0;x<=1000.0;x=x+50.0) {
			
			glLoadIdentity(); // Reset the model-view matrix 
			
			// we are passing the values for  x, y and no value for z to glTranslated
			// note it's glTranslate'd' for double
			glTranslated(x, y, 0.0); // Translate Right and up
			
			if (colorCode == 1) {
				
				colorCode = 0;
				glColor3f(1.0, 1.0, 1.0);
				
			} else {
				
				colorCode = 1;
				glColor3f(0.0, 0.0, 0.0);
				
			}
			
			glBegin(GL_POLYGON); // Each set of 4 vertices form a quad
				 
				glVertex2i(0,0);
				glVertex2i(0,50);
				glVertex2i(50,50);
				glVertex2i(50,0);
			glEnd();
		}
	}
	glFlush(); // Render now
}

/* Main function: GLUT runs as a console application starting at main() */

int main(int argc, char** argv) {
	
	glutInit(&argc, argv); // Initialize GLUT
	glutCreateWindow("Performing Transation"); // Create window with the given title
	glutInitWindowSize(640, 480); // Set the window's initial width & height
	glutInitWindowPosition(50, 50); // Position the window's initial top-left corner
	initGL();
	glutDisplayFunc(display); // Register callback handler for window re-paint event // Our own OpenGL initialization
	glutMainLoop(); // Enter the event-processing loop
	return 0;
	
}