Name

pset_ws_vp3 − Resets the workstation transformation according to 3D viewport limits. 

Operating States: PHOP, WSOP, ∗, ∗
PHIGS standard function

Syntax

void pset_ws_vp3 (
  Pint             wsid,       /∗ (I) Workstation identifier ∗/
  const Plimit3   ∗viewport    /∗ (I) Workstation viewport limits, in
                                      device coordinates ∗/
)

Data Structures

typedef struct {
    Pfloat   x_min;    /∗ x minimum ∗/
    Pfloat   x_max;    /∗ x maximum ∗/
    Pfloat   y_min;    /∗ y minimum ∗/
    Pfloat   y_max;    /∗ y maximum ∗/
    Pfloat   z_min;    /∗ z minimum ∗/
    Pfloat   z_max;    /∗ z maximum ∗/
} Plimit3;

Description

pset_ws_vp3 resets the workstation transformation on the specified workstation.  (See Getting Started with DEC PHIGS for information about workstation transformations and the coordinate systems comprising the transformation pipeline.)  You specify three-dimensional workstation viewport limits within device coordinate space in the order XMIN, XMAX, YMIN, YMAX, ZMIN, ZMAX. 

The XMIN and YMIN values must be less than the XMAX and YMAX values, respectively.  The ZMIN value must be less than or equal to the ZMAX value. 

The pset_ws_vp3 function sets the requested workstation viewport entry in the workstation state list to the specified values.  Digital PHIGS sets only the requested entry, because workstation transformation may be deferred.  (See the pupd_ws function.) 

When the workstation is updated, Digital PHIGS resets the current workstation viewport entry in the workstation state list, as influenced by the values of these entries:

•The dynamic modification accepted (DMA) for workstation transformation entry in the workstation description table (where IMM indicates that all picture changes of the specified category can be performed immediately)

•The display space empty (DSE) entry in the workstation state list

•The workstation transformation update state entry in the workstation state list

The effects are defined in the following table:

DMA    DSE    Result
------------------------------------------------------------------------
IMM    N/A    The current workstation viewport entry is set to the
              specified value, and the workstation transformation
              update state entry is set to NOTPENDING.
N/A    EMPTY  The current workstation viewport entry is set to the
              specified value, and the workstation transformation
              update state entry is set to NOTPENDING.
Not    Not    The current workstation viewport entry is unchanged,
IMM    EMPTY  and the workstation transformation update state entry
              is set to PENDING.
------------------------------------------------------------------------

The workstation transformation is an isotropic transformation.  Therefore, if the workstation window and the workstation viewport do not have the same aspect ratio, the workstation viewport is not fully utilized. 

The default workstation viewport is the maximum display space of the workstation. 

See Also

pinq_disp_space_size3
pinq_ws_tran3
pset_ws_vp
pset_ws_win3
pupd_ws