VPORT - Set the viewport using normalised device coordinates

Description:

The viewport is set by specifying its extent in the X and Y directions in terms of normalised device coordinates (i.e. coordinates that run from 0 to 1 along the horizontal and vertical directions).

This command is a synonym for VIEWPORT NDC.

Usage:

vport [xvpmin] [xvpmax] [yvpmin] [yvpmax]

Parameters:

XVPMIN = _REAL (Read and Write)

The left hand side of the viewport.

If the value is not specified on the command line, the current value is used. The current value is initially set to 0.0.

XVPMAX = _REAL (Read and Write)

The right hand side of the viewport.

If the value is not specified on the command line, the current value is used. The current value is initially set to 1.0.

YVPMIN = _REAL (Read and Write)

The lower side of the viewport.

If the value is not specified on the command line, the current value is used. The current value is initially set to 0.0.

YVPMAX = _REAL (Read and Write)

The upper side of the viewport.

If the value is not specified on the command line, the current value is used. The current value is initially set to 1.0.