/*****************************************************************************
*   Default curve drawing routine common to graphics drivers.		     *
*									     *
* Written by:  Gershon Elber				Ver 0.1, June 1993.  *
*****************************************************************************/

#include "irit_sm.h"
#include "iritprsr.h"
#include "allocate.h"
#include "ip_cnvrt.h"
#include "cagd_lib.h"
#include "iritgrap.h"

/****************************************************************************
* Draw a single Curve object using current modes and transformations.	    *
*   Curve must be with either E3 or P3 point type and must be NURB.	    *
*   Control points in SGI's format must be found in "_ctlpoints" attribute. *
****************************************************************************/
void IGDrawCurve(IPObjectStruct *PObj)
{
    IPObjectStruct *PObjPolylines, *PObjCtlPolys;

    if ((PObjPolylines = AttrGetObjectObjAttrib(PObj, "_isoline")) == NULL) {
	CagdCrvStruct *Crv,
	    *Crvs = PObj -> U.Crvs;
	IPPolygonStruct *PPolyline;

	PObjPolylines = IPAllocObject("", IP_OBJ_POLY, NULL);
	PObjPolylines -> Attrs = AttrCopyAttributes(PObj -> Attrs);
	IP_SET_POLYLINE_OBJ(PObjPolylines);
	for (Crv = Crvs; Crv != NULL; Crv = Crv -> Pnext) {
	    PPolyline = IritCurve2Polylines(Crv, IGGlblSamplesPerCurve);

	    PPolyline -> Pnext = PObjPolylines -> U.Pl;
	    PObjPolylines -> U.Pl = PPolyline;
	}
	AttrSetObjectObjAttrib(PObj, "_isoline", PObjPolylines);
    }
    IGDrawPoly(PObjPolylines);

    if (IGGlblDrawSurfaceMesh) {
	if ((PObjPolylines = AttrGetObjectObjAttrib(PObj, "_ctlpoly"))
								== NULL) {
	    CagdCrvStruct *Crv,
		*Crvs = PObj -> U.Crvs;
	    IPPolygonStruct *PCtlPoly;

	    PObjCtlPolys = IPAllocObject("", IP_OBJ_POLY, NULL);
	    PObjCtlPolys -> Attrs = AttrCopyAttributes(PObj -> Attrs);
	    IP_SET_POLYLINE_OBJ(PObjCtlPolys);
	    for (Crv = Crvs; Crv != NULL; Crv = Crv -> Pnext) {
		PCtlPoly = IritCurve2CtlPoly(Crv);

		PCtlPoly -> Pnext = PObjCtlPolys -> U.Pl;
		PObjCtlPolys -> U.Pl = PCtlPoly;
	    }
	    AttrSetObjectObjAttrib(PObj, "_ctlpoly", PObjCtlPolys);
	}

	IGDrawPoly(AttrGetObjectObjAttrib(PObj, "_ctlpoly"));
    }
}