The scale subroutine shrinks, expands, and mirrors drawing primitives.
Negative values mirror the primitive.
All drawing primitives drawn after the scale subroutine executes are affected. Use the pushmatrix and popmatrix subroutines to limit the scope of the scale subroutine. If lighting is on, and the scale subroutine is called with unequal arguments, the lighting pipeline is forced to renormalize every normal automatically. This may degrade performance on some adapters. Parameters x Specifies scaling of the drawing primitive in the x direction.