Drawing four graphical shapes

In this recipe, we will learn to draw four different shapes: a square, a triangle, points, and a line.

How to do it...

The following are the steps to make different graphical shapes:

1. Initialize GLUT, define the window size, create the window, and set the position of the window.
2. Define the callback function that will be automatically invoked after displaying the window.
3. To draw a square, first, define its color.
4. Draw a square by defining its four vertices and enclosing them within glBegin and glEnd statements along with the GL_QUADS keyword.
5. To draw a line, set the width and color of the line.
6. Group a pair of vertices within glBegin and glEnd with the GL_LINES keyword to draw a line.
7. To draw the...