Function glRectiv

glRect supports efficient specification of rectangles as two corner points. Each rectangle command takes four arguments, organized either as two consecutive pairs of (𝐱, 𝐲) coordinates or as two pointers to arrays, each containing an (𝐱, 𝐲) pair. The resulting rectangle is defined in the 𝐳 = 0 plane.

glRect(x1, y1, x2, y2) is exactly equivalent to the following sequence:

glBegin(GL_POLYGON);
glVertex2(x1, y1);
glVertex2(x2, y1);
glVertex2(x2, y2);
glVertex2(x1, y2);
glEnd();
Copy

Note that if the second vertex is above and to the right of the first vertex, the rectangle is constructed with a counterclockwise winding.

Summary

draw a rectangle

See

glRect