WAP to draw different shapes with color in Opengl.

#include <GL\glut.h>

void init(void)
{
glClearColor(1.0, 1.0, 1.0, 0.0); // Set display window colour to white

glMatrixMode(GL_PROJECTION); // Set projection parameters
gluOrtho2D(0.0, 400.0, 0.0, 400.0);
}

void drawShapes(void)
{
glClear(GL_COLOR_BUFFER_BIT); // Clear display window

//Set colour to black
glColor3f(0.0, 0.0, 0.0);
//Adjust the point size
glPointSize(5.0);

// Draw a couple of points
glBegin(GL_POINTS);
glVertex2i(60, 360);
glVertex2i(140, 360);
glEnd();

//Set colour to green
glColor3f(0.0, 1.0, 0.0);

// Draw a filled triangle
glBegin(GL_TRIANGLES);
glVertex2i(20, 250);
glVertex2i(100, 380);
glVertex2i(180, 250);
glEnd();

//Set colour to red
glColor3f(1.0, 0.0, 0.0);

// Draw a filled quadrilateral
glBegin(GL_QUADS);
glVertex2i(200, 250);
glVertex2i(200, 380);
glVertex2i(380, 380);
glVertex2i(380, 250);
glEnd();

//Set colour to blue
glColor3f(0.0, 0.0, 1.0);

// Draw a filled octagon
glBegin(GL_POLYGON);
glVertex2i(90, 30);
glVertex2i(30, 90);
glVertex2i(30, 174);
glVertex2i(90, 234);
glVertex2i(174, 234);
glVertex2i(234, 174);
glVertex2i(234, 90);
glVertex2i(174, 30);
glEnd();

//Set colour to black
glColor3f(0.0, 0.0, 0.0);

// Draw an outlined triangle
glBegin(GL_LINE_LOOP);
glVertex2i(260, 30);
glVertex2i(320, 230);
glVertex2i(380, 30);
glEnd();

glFlush(); // Process all OpenGL routines
}

int main(int argc, char* argv[])
{
glutInit(&argc, argv); // Initalise GLUT
glutInitDisplayMode(GLUT_SINGLE|GLUT_RGB); // Set display mode

glutInitWindowPosition(50, 100); // Set window position
glutInitWindowSize(400, 300); // Set window size
glutCreateWindow("An Example OpenGL Program"); // Create display window

init(); // Execute initialisation procedure
glutDisplayFunc(drawShapes); // Send graphics to display window
glutMainLoop(); // Display everything and wait

return 0;
}