Opengl draw house using glut c++

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

void init()
{
	// Set display window color to as glClearColor(R,G,B,Alpha)
	glClearColor(0.5, 0.9, 0.4, 0.0);

	// Set projection parameters.

	glMatrixMode(GL_PROJECTION);
	// Set 2D Transformation as gluOrtho2D(Min Width, Max Width, Min Height, Max Height)
	gluOrtho2D(0.0, 800, 0.0, 600);

}

void home()
{

	glClear(GL_COLOR_BUFFER_BIT); // Clear display window
	// Set line segment color as glColor3f(R,G,B)

	//side Wal
	glColor3f(0.1, 0.2, 0.3);
	glBegin(GL_LINE_LOOP);
	glVertex2i(200, 100);
	glVertex2i(200, 350);
	glVertex2i(100, 350);
	glVertex2i(100, 400);
	glVertex2i(700, 400);
	glVertex2i(700, 350);
	glVertex2i(600, 350);
	glVertex2i(600, 100);
	glEnd();

	//Left window
	glColor3f(0.2, 0.4, 0.3);
	glBegin(GL_POLYGON);
	glVertex2i(230, 320);
	glVertex2i(350, 320);
	glVertex2i(350, 230);
	glVertex2i(230, 230);
	glEnd();

	// lines on left window
	glColor3f(0.1, 0.7, 0.5);
	glLineWidth(5);
	glBegin(GL_LINES);
	glVertex2i(290, 320);
	glVertex2i(290, 230);
	glVertex2i(230, 273);
	glVertex2i(350, 273);
	glEnd();

	//right window
	glColor3f(0.2, 0.4, 0.3);
	glBegin(GL_POLYGON);
	glVertex2i(430, 320);
	glVertex2i(550, 320);
	glVertex2i(550, 230);
	glVertex2i(430, 230);
	glEnd();

	// lines on right window
	glColor3f(0.1, 0.7, 0.5);
	glLineWidth(5);
	glBegin(GL_LINES);
	glVertex2i(490, 320);
	glVertex2i(490, 230);
	glVertex2i(430, 273);
	glVertex2i(550, 273);
	glEnd();

	// Front Door
	glColor3f(0.7, 0.2, 0.9);
	glBegin(GL_POLYGON);
	glVertex2i(350, 200);
	glVertex2i(425, 200);
	glVertex2i(425, 100);
	glVertex2i(350, 100);
	glEnd();

	// Front Door Lock/knob
	glColor3f(0.3, 0.7, 0.9);
	glPointSize(10);
	glBegin(GL_POINTS);
	glVertex2i(400, 150);
	glEnd();

	//semi-circle roof
	//fix variable naming
	int centerx = 400;//x axis center
	int centery = 400;//y axis center
	int roofr = 100;//radius
	int roofd = 200;//diameter
	float PI = 3.141592653589793238f;
	float semicircleangle = PI * 1.0f;
	int steps = 100;
	glBegin(GL_TRIANGLE_FAN);

	for (int i = 0; i < steps; i++) {
		float theta = semicircleangle * float(i) / float(steps);//get the current angle
		float x = roofr * cosf(theta);//calculate the x component
		float y = roofr * sinf(theta);//calculate the y component
		glVertex2f(x + centerx, y + centery);//output vertex

	}
	glEnd();

	//first circle moon
	int moonr = 50;
	int mooncenterx = 700;
	int mooncentery = 500;
	int moonsteps = 100;
	float circleangle = PI * 2.0f;
	glColor3f(1.0, 1.0, 1.0);
	glBegin(GL_TRIANGLE_FAN);

	for (int a = 0; a <= moonsteps; a++) {
		float angle = circleangle * float(a) / float(moonsteps);//get the current angl
		float moonx = moonr * cosf(angle);//calculate the x component
		float moony = moonr * sinf(angle);//calculate the y component
		glVertex2f(moonx + mooncenterx, moony + mooncentery);//output vertex
	}
	glEnd();
	//second circle moon
	int moon2r = 50;
	int mooncenter2x = 725;
	int mooncenter2y = 525;
	int moonsteps2 = 100;
	float circleangle2 = PI * 2.0f;
	glColor3f(0.5, 0.9, 0.4);
	glBegin(GL_TRIANGLE_FAN);

	for (int b = 0; b <= moonsteps; b++) {
		float angle2 = circleangle * float(b) / float(moonsteps2);//get the current angle
		float moon2x = moonr * cosf(angle2);//calculate the x component
		float moon2y = moonr * sinf(angle2);//calculate the y component
		glVertex2f(moon2x + mooncenter2x, moon2y + mooncenter2y);//output vertex
	}
	glEnd();
	// Process all OpenGL routine s as quickly as possible
	glFlush();
}

	int main(int argc, char** argv) {
	// Initialize GLUT
	glutInit(&argc, argv);
	// Set display mode
	glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
	// Set top - left display window position.
	glutInitWindowPosition(100, 100);
	// Set display window width and height
	glutInitWindowSize(900, 700);
	// Create display window with the given title
	glutCreateWindow("2D House Assignment");
	// Execute initialization procedure
	init();
	// Send graphics to display window
	glutDisplayFunc(home);
	// Display everything and wait.
	glutMainLoop();
}

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