An aligned rectangle can be described in other ways than by two opposite corners which introduced by OpenGl.

One possibility is by:: Its upper left corner, width, and aspect ratio.

Write function drawRectangleCornerSize() that pass these alternative parameters.

void drawRectangleCornerSize(GLintPoint upperLeftCorner, float width, float aspectRatio)

{

.

.

Your code here

.

.

}