AGI_TWTOD - Transform world to data coordinates

Description:

Transform a set of world coordinates into data coordinates using a transformation stored in the database. The picture identifier signifies which picture contains the required transformation structure. If this identifier is negative then the current picture is used. If no transformation structure is found then the identity transformation is used, i.e. the data coordinates equal the world coordinates.

Invocation:

CALL AGI_TWTOD( PICID, NXY, WX, WY, DX, DY, STATUS )

Arguments:

PICID = INTEGER (Given)

Picture identifier

NXY = INTEGER (Given)

Number of data points to transform

WX = REAL(NXY) (Given)

Array of x world coordinates

WY = REAL(NXY) (Given)

Array of y world coordinates

DX = REAL(NXY) (Returned)

Array of x data coordinates

DY = REAL(NXY) (Returned)

Array of y data coordinates

STATUS = INTEGER (Given and Returned)

The global status