pfJunction(3pf) OpenGL Performer 3.2.2 libpf C Reference Pages
NAME
pfNewJunction, pfGetJunctionClassType, pfJunctionAddEndPt,
pfGetJunctionSpokeCount, pfGetJunctionSurface, pfGetJunctionLoop,
pfGetJunctionTrimCurve, pfGetJunctionWhichEndPt - The end points of
boundaries.
FUNCTION SPECIFICATION
#include <Performer/pf.h>
pfJunction * pfNewJunction(void *arena);
pfType * pfGetJunctionClassType(void);
void pfJunctionAddEndPt(pfJunction* junction, int i,
pfParaSurface *sur, int trimLoop, int trimCurve,
int which );
int pfGetJunctionSpokeCount(pfJunction* junction);
int pfGetJunctionSurface(pfJunction* junction, int i );
int pfGetJunctionLoop(pfJunction* junction, int i );
int pfGetJunctionTrimCurve(pfJunction* junction, int i );
int pfGetJunctionWhichEndPt(pfJunction* junction, int i );
PARENT CLASS FUNCTIONS
The OpenGL Performer class pfJunction is derived from the parent class
pfObject, so each of these member functions of class pfObject are also
directly usable with objects of class pfJunction. Casting an object of
class pfJunction to an object of class pfObject is taken care of
automatically. This is also true for casts to objects of ancestor
classes of class pfObject.
void pfUserDataSlot(pfObject *obj, int slot, void *data);
void pfUserData(pfObject *obj, void *data);
void* pfGetUserDataSlot(pfObject *obj, int slot);
void* pfGetUserData(pfObject *obj);
int pfGetNumUserData(pfObject *obj);
int pfGetNamedUserDataSlot(const char *name);
const char* pfGetUserDataSlotName(int slot);
int pfGetNumNamedUserDataSlots(void);
int pfDeleteGLHandle(pfObject *obj);
Since the class pfObject is itself derived from the parent class
pfMemory, objects of class pfJunction can also be used with these
functions designed for objects of class pfMemory.
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pfJunction(3pf) OpenGL Performer 3.2.2 libpf C Reference Pages
pfType * pfGetType(const void *ptr);
int pfIsOfType(const void *ptr, pfType *type);
int pfIsExactType(const void *ptr, pfType *type);
const char * pfGetTypeName(const void *ptr);
int pfRef(void *ptr);
int pfUnref(void *ptr);
int pfUnrefDelete(void *ptr);
int pfUnrefGetRef(void *ptr);
int pfGetRef(const void *ptr);
int pfCopy(void *dst, void *src);
int pfDelete(void *ptr);
int pfIsFluxed(void *ptr);
int pfCompare(const void *ptr1, const void *ptr2);
void pfPrint(const void *ptr, uint which, uint verbose,
FILE *file);
void * pfGetArena(void *ptr);
DESCRIPTION
A junction is one or more boundaries that come together at a single point
in 3D space. To ensure the topological integrity of this arrangment the
boundaries' (pfBoundary) endpoints point to an pfJunction structure and
visa-versa. pfJunction contains the information on all the boundaries
that meet at this junction. For each boundary, it has a flag indicating
which end point is the relevant end point. pfJunction is similar to
pfBoundary, except that it holds a list of boundaries that meet at a
junction. Like an pfBoundary, pfJunction also holds the model
coordinates of the junction.
pfNewJunction creates and returns a handle to a pfJunction. arena
specifies a malloc arena out of which the pfJunction is allocated or NULL
for allocation off the process heap. pfJunctions can be deleted with
pfDelete.
pfGetJunctionClassType returns the pfType* for the class pfJunction. the
pfType* returned by pfGetJunctionClassType is the same as the pfType*
returned by invoking pfGetType on any instance of class pfJunction.
Because OpenGL Performer allows subclassing of built-in types, when
decisions are made based on the type of an object, it is usually better
to use pfIsOfType to test if an object is of a type derived from a
Performer type rather than to test for strict equality of the pfType*'s.
pfJunctionAddEndPt adds a new spoke to the surface list where surface
corresponds to the surface index to the surface list, trimLoop refers to
the trim loop index of surface, trimCurve corresponds to the trim curve
index with the trim lopp and which corresponds to which end
(PFEND_POINT_BEGIN or PFEND_POINT_END) of the curve is a junction.
pfGetJunctionSpokeCount returns the number of surfaces that meet at this
junction.
pfGetJunctionSurface returns information associated with the i'th spoke.
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pfJunction(3pf) OpenGL Performer 3.2.2 libpf C Reference Pages
pfGetJunctionLoop returns the loop number of the i'th spoke.
pfGetJunctionTrimCurve gets the trim curve number of the i'th spoke.
pfGetJunctionWhichEndPt gets the information on which end point of the
i'th spoke. Will be either PFEND_POINT_BEGIN or PFEND_POINT_END.
SEE ALSO
pfTopo, pfCurve2d, pfEdge, pfDisCurve2d, pfDisCurve3d, pfParaSurface
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