create.c

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/* Copyright (c) 1992 The Geometry Center; University of Minnesota
   1300 South Second Street;  Minneapolis, MN  55454, USA;
   
This file is part of geomview/OOGL. geomview/OOGL is free software;
you can redistribute it and/or modify it only under the terms given in
the file COPYING, which you should have received along with this file.
This and other related software may be obtained via anonymous ftp from
geom.umn.edu; email: software@geom.umn.edu. */
static char *copyright = "Copyright (C) 1992 The Geometry Center";

/* Authors: Charlie Gunn, Stuart Levy, Tamara Munzner, Mark Phillips */

#include "geomclass.h"

Geom *
GeomCreate(char *type, ...)
{
    va_list a_list;
    Geom *newgeom = (Geom *) NULL;
    GeomClass *Class = (GeomClass *) NULL;

    va_start (a_list, type);
    Class = GeomClassLookup(type);
    /* now use the create method to get a new geom ... */
    if (Class == NULL) {
	GeomError(0/*Unknown Class XXX*/, "GeomCreate: unknown object class %s", type);
	va_end (a_list);
	return NULL;
    }

    if (Class->create)
        newgeom = (Geom *) (*Class->create)(NULL, Class, a_list);
    /* need error check here */

    va_end (a_list);
    return newgeom;
}

int
GeomSet(Geom *g, ...)
{
    int ok = -1;
    va_list a_list;

    va_start (a_list, g);

    if (g && g->Class && g->Class->create)
        if((*g->Class->create)(g, g->Class, a_list))
	    ok = 1;

    va_end (a_list);
    return ok;
}


int
GeomGet(Geom *g, int attr, void *attrp)
{
    if(g == NULL)
	return -1;

    switch(attr) {
    case CR_APPEAR:
	*(Appearance **)attrp = g->ap;
	break;
    case CR_HANDLE:
	*(Handle **)attrp = g->handle;
	break;
    default:
	if(g->Class->get)
	    return (*g->Class->get)(g, attr, attrp);
    }
    return 0;
}

    
Geom *
GeomCCreate(Geom *g, GeomClass *c, ...)
{
    va_list a_list;
    Geom *newgeom = g;
    GeomClass *Class = c;
    char *type;

    va_start (a_list, c);
    if(Class == NULL && newgeom != NULL)
	Class = newgeom->Class;

    if (Class && Class->create)
        newgeom = (Geom *) (*Class->create)(newgeom, Class, a_list);
    /* need error check here */

    va_end (a_list);
    return newgeom;
}

/*
 * Initialize common data for Geom objects
 */
GGeomInit(g, Class, magic, ap)
    int magic;
    register Geom *g;
    GeomClass *Class;
    Appearance *ap;
{
    RefInit((Ref *)g, magic);
    g->Class = Class;
    g->ap = ap;
    if(ap != NULL)	/* If it's a real Appearance, bump its ref count */
	RefIncr((Ref *)ap);
    g->aphandle = NULL;
    g->geomflags = 0; 
}

/*
 * Handle one exceptional item from a GeomCreate() arg list.
 * We know how to set common Geom fields.
 */
GeomDecorate(g, copyp, feature, ap)
    Geom *g;
    register int *copyp;/* Flag: "copy" parameters passed by reference? */
    int feature;	/* Attribute -- value already va_arg'ed by caller */
    register va_list *ap;
{
    Handle *hand;
    Appearance *nap;
    int val;

    if(feature == 0 || g == NULL)
	return 1;

    switch(feature) {
    case CR_4D:		/* this is a token, value pair so it can be
			set conditionally */
	val = va_arg(*ap, int);
 	g->geomflags |= val ? VERT_4D : 0;
	break;
    case CR_APPEAR:		/* Assign or remove Appearance.  */
	nap = va_arg(*ap, Appearance *);
	if(nap && *copyp) RefIncr((Ref *)nap);
	if(g->ap) ApDelete(g->ap);
	g->ap = nap;
	break;
    case CR_COPY:
	*copyp = 1;
	break;
    case CR_NOCOPY:
	*copyp = 0;
	break;
    default:
	return 1; /* Unknown attribute */
    }
    return 0;
}

Appearance *
GeomAppearance(Geom *g)
{
    return g ? g->ap : NULL;
}
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