Syntax

[C/C++:]
void gUntransformPoint2D(float xp, float yp, GPOINT *point2);
void gUntransformPoint3D(float xp, float yp, float zp, GPOINT3 *point3);

[F90:]
subroutine gUntransformPoint2D(xp, yp, point2)
subroutine gUntransformPoint3D(xp, yp, zp, point3)

real, intent(in) :: xp,yp,zp
type (GPOINT), intent(out) :: point2
type (GPOINT3), intent(out) :: point3

Arguments

xp,yp,zp
2D or 3D position in picture coordinates

point2,point3
Untransformed position in space coordinates

Description

The routines gUntransformPoint2D() and gUntransformPoint3D() transform the specified point into space coordinates according to the current global transformation matrix (modelling and viewing). If transforming is switched off, the returned point is the same as the input point.

The routine gUntransformPoint2D() uses the inverse of the 2-D part of the current global transformation. If the global transformation contains 3-D (in the case of gUntransformPoint2D()) or perspective terms (either routine), warning messages are output and the returned point is set to zero.

See Also

gUntransformPoint2D Usage

---