home *** CD-ROM | disk | FTP | other *** search
- /*****************************************************************************
- * "Irit" - the 3d polygonal solid modeller. *
- * *
- * Written by: Gershon Elber Ver 0.2, Mar. 1990 *
- ******************************************************************************
- * Module to handle the objects list - fetch, insert, delete etc... *
- *****************************************************************************/
-
- /* #define DEBUG Output goes to stdout if defined. */
-
- #include <stdio.h>
- #include <string.h>
- #include <math.h>
- #include "program.h"
- #include "allocate.h"
- #include "dataprsr.h"
- #include "attribut.h"
- #include "geomat3d.h"
- #include "graphgen.h"
- #include "objects.h"
- #include "windows.h"
-
- static int GetDumpLevel(void);
- static PolygonStruct *GenAxesObjectPolylines(void);
- static void PrintOneLine(char *Line);
-
- /*****************************************************************************
- * Routine to set up all the predefined objects - objects that the system *
- * must have all the time, like global transformation matrix. *
- *****************************************************************************/
- void SetUpPredefObjects(void)
- {
- RealType R;
- MatrixType Mat1, Mat2;
- ObjectStruct *PObj;
-
- /* 90 - 35.2644 = 54.7356 */
- MatGenMatRotX1(DEG2RAD(-54.7356), Mat1); /* Generate default view trans. */
- MatGenMatRotZ1(M_PI+M_PI/4, Mat2); /* which is isometric view. */
- MatMultTwo4by4(Mat2, Mat2, Mat1);
- PObj = GenMatObject("VIEW_MAT", Mat2, NULL);
- InsertObject(PObj);
-
- MatGenUnitMat(Mat1); /* Generate default perspective trans. */
- Mat1[2][2] = 0.1;
- Mat1[2][3] = -0.35;
- Mat1[3][2] = 0.35;
- PObj = GenMatObject("PRSP_MAT", Mat1, NULL);
- InsertObject(PObj);
-
- R = DEFAULT_RESOLUTION;
- PObj = GenNumObject("RESOLUTION", &R, NULL);
- InsertObject(PObj);
-
- R = DEFAULT_DRAW_CTLPT;
- PObj = GenNumObject("DRAWCTLPT", &R, NULL);
- InsertObject(PObj);
-
- R = DEFAULT_INTERNAL;
- PObj = GenNumObject("INTERNAL", &R, NULL);
- InsertObject(PObj);
-
- R = DEFAULT_INTERCRV;
- PObj = GenNumObject("INTERCRV", &R, NULL);
- InsertObject(PObj);
-
- R = DEFAULT_ECHOSRC;
- PObj = GenNumObject("ECHOSRC", &R, NULL);
- InsertObject(PObj);
-
- R = DEFAULT_DUMPLVL;
- PObj = GenNumObject("DUMPLVL", &R, NULL);
- InsertObject(PObj);
-
- R = 0;
- PObj = GenNumObject("FLAT4PLY", &R, NULL);
- InsertObject(PObj);
-
- R = MACHINE_UNIX;
- #if defined(__MSDOS__) || defined(DJGCC)
- R = MACHINE_MSDOS;
- #endif
- #if defined(sgi)
- R = MACHINE_SGI;
- #endif
- #if defined(hpbsd) || defined(hpux)
- R = MACHINE_HP;
- #endif
- #if defined(sun)
- R = MACHINE_SUN;
- #endif
- #if defined(apollo)
- R = MACHINE_APOLLO;
- #endif
-
- PObj = GenNumObject("MACHINE", &R, NULL);
- InsertObject(PObj);
-
- PObj = GenPolyObject("AXES", GenAxesObjectPolylines(), NULL);
- SET_POLYLINE_OBJ(PObj); /* Mark it as polyline object. */
- InsertObject(PObj);
- }
-
- /*****************************************************************************
- * Routine to get the value to EchoSrc variable. *
- *****************************************************************************/
- static int GetDumpLevel(void)
- {
- int DumpLvl;
- ObjectStruct
- *PObj = GetObject("DUMPLVL");
-
- if (PObj == NULL || !IS_NUM_OBJ(PObj)) {
- WndwInputWindowPutStr("No numeric object name DumpLvl is defined");
- DumpLvl = DEFAULT_DUMPLVL;
- }
- else
- DumpLvl = (int) (PObj -> U.R);
-
- return DumpLvl;
- }
-
- /*****************************************************************************
- * Generate an axes system with length of 1 on each axis. *
- *****************************************************************************/
- static PolygonStruct *GenAxesObjectPolylines(void)
- {
- PolygonStruct *Pl, *PlHead;
- VertexStruct *V;
-
- Pl = PlHead = AllocPolygon(0, 0, NULL, NULL); /* X axis. */
- Pl -> V = V = AllocVertex(0, 0, NULL, NULL);
- V -> Pt[0] = 0.0; V -> Pt[1] = 0.0; V -> Pt[2] = 0.0;
- V -> Pnext = AllocVertex(0, 0, NULL, NULL); V = V -> Pnext;
- V -> Pt[0] = 1.0; V -> Pt[1] = 0.0; V -> Pt[2] = 0.0;
- V -> Pnext = AllocVertex(0, 0, NULL, NULL); V = V -> Pnext;
- V -> Pt[0] = 1.0; V -> Pt[1] = 0.1; V -> Pt[2] = 0.1;
-
- Pl -> Pnext = AllocPolygon(0, 0, NULL, NULL); Pl = Pl -> Pnext;
- Pl -> V = V = AllocVertex(0, 0, NULL, NULL);
- V -> Pt[0] = 1.0; V -> Pt[1] = 0.1; V -> Pt[2] = 0.0;
- V -> Pnext = AllocVertex(0, 0, NULL, NULL); V = V -> Pnext;
- V -> Pt[0] = 1.0; V -> Pt[1] = 0.0; V -> Pt[2] = 0.1;
-
- Pl -> Pnext = AllocPolygon(0, 0, NULL, NULL); Pl = Pl -> Pnext;/* Y axis.*/
- Pl -> V = V = AllocVertex(0, 0, NULL, NULL);
- V -> Pt[0] = 0.0; V -> Pt[1] = 0.0; V -> Pt[2] = 0.0;
- V -> Pnext = AllocVertex(0, 0, NULL, NULL); V = V -> Pnext;
- V -> Pt[0] = 0.0; V -> Pt[1] = 1.0; V -> Pt[2] = 0.0;
- V -> Pnext = AllocVertex(0, 0, NULL, NULL); V = V -> Pnext;
- V -> Pt[0] = 0.0; V -> Pt[1] = 1.0; V -> Pt[2] = 0.06;
- V -> Pnext = AllocVertex(0, 0, NULL, NULL); V = V -> Pnext;
- V -> Pt[0] = 0.04; V -> Pt[1] = 1.0; V -> Pt[2] = 0.1;
- V -> Pnext = AllocVertex(0, 0, NULL, NULL); V = V -> Pnext;
- V -> Pt[0] = 0.0; V -> Pt[1] = 1.0; V -> Pt[2] = 0.06;
- V -> Pnext = AllocVertex(0, 0, NULL, NULL); V = V -> Pnext;
- V -> Pt[0] =(-0.04);V -> Pt[1] = 1.0; V -> Pt[2] = 0.1;
-
- Pl -> Pnext = AllocPolygon(0, 0, NULL, NULL); Pl = Pl -> Pnext;/* Z axis.*/
- Pl -> V = V = AllocVertex(0, 0, NULL, NULL);
- V -> Pt[0] = 0.0; V -> Pt[1] = 0.0; V -> Pt[2] = 0.0;
- V -> Pnext = AllocVertex(0, 0, NULL, NULL); V = V -> Pnext;
- V -> Pt[0] = 0.0; V -> Pt[1] = 0.0; V -> Pt[2] = 1.0;
- V -> Pnext = AllocVertex(0, 0, NULL, NULL); V = V -> Pnext;
- V -> Pt[0] = 0.1; V -> Pt[1] = 0.0; V -> Pt[2] = 1.0;
- V -> Pnext = AllocVertex(0, 0, NULL, NULL); V = V -> Pnext;
- V -> Pt[0] = 0.0; V -> Pt[1] = 0.1; V -> Pt[2] = 1.0;
- V -> Pnext = AllocVertex(0, 0, NULL, NULL); V = V -> Pnext;
- V -> Pt[0] = 0.1; V -> Pt[1] = 0.1; V -> Pt[2] = 1.0;
-
- return PlHead;
- }
-
- /*****************************************************************************
- * Get the nth object in a list. Object reference is properly updated. *
- *****************************************************************************/
- ObjectStruct *GetNthList(ObjectStruct *ListObj, RealType *Rn)
- {
- int i,
- n = REAL_PTR_TO_INT(Rn);
- ObjectStruct *PObj;
-
- if (!IS_OLST_OBJ(ListObj)) {
- WndwInputWindowPutStr("None list object ignored.");
- return NULL;
- }
-
- if (n < 1 || n >= MAX_OBJ_LIST) {
- WndwInputWindowPutStr("Out of range of list.");
- return NULL;
- }
- for (i = 0; i < n; i++) if (ListObj -> U.PObjList[i] == NULL) {
- WndwInputWindowPutStr("Out of range of list.");
- return NULL;
- }
-
- PObj = CopyObject(NULL, ListObj -> U.PObjList[n - 1], FALSE);
- return PObj;
- }
-
- /*****************************************************************************
- * Append two lists. Object reference is properly updated. *
- *****************************************************************************/
- ObjectStruct *AppendLists(ObjectStruct *ListObj1, ObjectStruct *ListObj2)
- {
- int i, j;
- ObjectStruct *PObj;
-
- if (!IS_OLST_OBJ(ListObj1) && !IS_OLST_OBJ(ListObj2)) {
- WndwInputWindowPutStr("None list object ignored.");
- return NULL;
- }
-
- PObj = AllocObject("", OBJ_LIST_OBJ, NULL);
-
- for (i = 0; ListObj1 -> U.PObjList[i] != NULL && i < MAX_OBJ_LIST; i++) {
- PObj -> U.PObjList[i] = ListObj1 -> U.PObjList[i];
- PObj -> U.PObjList[i] -> Count++;
- }
-
- for (j = 0; ListObj2 -> U.PObjList[j] != NULL && i < MAX_OBJ_LIST; i++, j++) {
- PObj -> U.PObjList[i] = ListObj2 -> U.PObjList[j];
- PObj -> U.PObjList[i] -> Count++;
- }
- if (i < MAX_OBJ_LIST)
- PObj -> U.PObjList[i] = NULL;
-
- return PObj;
- }
-
- /*****************************************************************************
- * Snoc (Cons to the end of the list, in place) the object to the list in *
- * the second argument. *
- *****************************************************************************/
- void SnocList(ObjectStruct *PObj, ObjectStruct *ListObj)
- {
- int i;
-
- if (!IS_OLST_OBJ(ListObj)) {
- WndwInputWindowPutStr("None list object ignored.");
- return;
- }
-
- for (i = 0; ListObj -> U.PObjList[i] != NULL && i < MAX_OBJ_LIST - 2; i++);
- if (i < MAX_OBJ_LIST - 2) {
- ListObj -> U.PObjList[i] = CopyObject(NULL, PObj, FALSE);
- ListObj -> U.PObjList[i] -> Count = 1;
- ListObj -> U.PObjList[i + 1] = NULL;
- }
- }
-
- /*****************************************************************************
- * Get object by its name - scans the object linear list. *
- * Note the termination is also on 1000 objects (simple debugging aid in case *
- * the Object list became circular), and a fatal error is produced. *
- *****************************************************************************/
- ObjectStruct *GetObject(char *ObjName)
- {
- int i = 0;
- ObjectStruct
- *PObj = GlblObjList;
-
- while (PObj) {
- if (strcmp(PObj -> Name, ObjName) == 0) {
- return PObj;
- }
- PObj = PObj -> Pnext;
- if (i++ >= 1000)
- FatalError("GetObject: Global Object list too big (>1000)\n");
- }
- return NULL;
- }
-
- /*****************************************************************************
- * Free Object - delete it from global active list and free all it memory *
- *****************************************************************************/
- void FreeObject(ObjectStruct *PObj)
- {
- /* Force free the object. Since the reference count should be actually */
- /* two (second for the parsing tree reference) we decrement it here. */
- if (PObj->Count == 2)
- {
- PObj->Count = 1;
- DeleteObject(PObj, TRUE);
- }
- else
- {
- /* Reduce the reference count by two - one for the parsing tree */
- /* this routine was called from and one for the fact this object */
- /* reference count is to be deleted since this routine was called. */
- DeleteObject(PObj, FALSE);
- PObj->Count -= 2;
- }
- }
-
- /*****************************************************************************
- * Delete object by its pointer - scans the object linear list. *
- * Note the deleted record is free only if Free = TRUE. *
- *****************************************************************************/
- void DeleteObject(ObjectStruct *PObj, int Free)
- {
- ObjectStruct
- *PObjScan = GlblObjList;
-
- if (GlblObjList == NULL) return;
-
- if (PObj == GlblObjList) { /* If it is the first one - special case. */
- GlblObjList = GlblObjList->Pnext;
- if (Free) MyFree((char *) PObj, ALLOC_OBJECT);
- return;
- }
-
- while (PObjScan->Pnext) {
- if (PObj == PObjScan->Pnext) {
- PObjScan->Pnext = PObjScan->Pnext->Pnext;/* Delete it from list. */
- if (Free) MyFree((char *) PObj, ALLOC_OBJECT); /* And free it. */
- return;
- }
- PObjScan = PObjScan->Pnext;
- }
- }
-
- /*****************************************************************************
- * Insert object by its pointer - as first in object linear list. *
- * Note it is assumed the object is not in the object list allready. *
- *****************************************************************************/
- void InsertObject(ObjectStruct *PObj)
- {
- PObj -> Pnext = GlblObjList;
- GlblObjList = PObj;
- }
-
- /*****************************************************************************
- * Print one line. *
- *****************************************************************************/
- static void PrintOneLine(char *Line)
- {
- WndwInputWindowPutStr(Line);
- }
-
- /*****************************************************************************
- * Print some usefull info on the given object. *
- *****************************************************************************/
- void PrintObject(ObjectStruct *PObj)
- {
- int Count = PObj -> Count;
- CagdRType
- DumpLvl = GetDumpLevel();
- char Line[LINE_LEN_LONG],
- *Name = (int) strlen(PObj -> Name) > 0 ? PObj -> Name : "NONE";
-
- switch (PObj->ObjType) {
- case UNDEF_OBJ:
- sprintf(Line, "%-10s (%d) - Undefined type", Name, Count);
- PrintOneLine(Line);
- break;
- case POLY_OBJ:
- sprintf(Line, "%-10s (%d) - Poly type", Name, Count);
- PrintOneLine(Line);
- if (DumpLvl >= 3)
- DataPrsrPutObject(NULL, PObj);
- break;
- case NUMERIC_OBJ:
- sprintf(Line, "%-10s (%d) - Numeric type", Name, Count);
- PrintOneLine(Line);
- if (DumpLvl >= 1)
- DataPrsrPutObject(NULL, PObj);
- break;
- case VECTOR_OBJ:
- sprintf(Line, "%-10s (%d) - Vector type", Name, Count);
- PrintOneLine(Line);
- if (DumpLvl >= 1)
- DataPrsrPutObject(NULL, PObj);
- break;
- case CTLPT_OBJ:
- sprintf(Line, "%-10s (%d) - CtlPt type", Name, Count);
- PrintOneLine(Line);
- if (DumpLvl >= 1)
- DataPrsrPutObject(NULL, PObj);
- break;
- case MATRIX_OBJ:
- sprintf(Line, "%-10s (%d) - Matrix type", Name, Count);
- PrintOneLine(Line);
- if (DumpLvl >= 1)
- DataPrsrPutObject(NULL, PObj);
- break;
- case STRING_OBJ:
- sprintf(Line, "%-10s (%d) - String type", Name, Count);
- PrintOneLine(Line);
- if (DumpLvl >= 1)
- DataPrsrPutObject(NULL, PObj);
- break;
- case OBJ_LIST_OBJ:
- sprintf(Line, "%-10s (%d) - Object List type", Name, Count);
- PrintOneLine(Line);
- if (DumpLvl >= 4)
- DataPrsrPutObject(NULL, PObj);
- break;
- case CURVE_OBJ:
- sprintf(Line, "%-10s (%d) - Curve type", Name, Count);
- PrintOneLine(Line);
- if (DumpLvl >= 2) {
- CagdSetCagdFprintf(PrintOneLine);
- DataPrsrPutObject(NULL, PObj);
- CagdSetCagdFprintf(NULL);
- }
- break;
- case SURFACE_OBJ:
- sprintf(Line, "%-10s (%d) - Surface type", Name, Count);
- PrintOneLine(Line);
- if (DumpLvl >= 2) {
- CagdSetCagdFprintf(PrintOneLine);
- DataPrsrPutObject(NULL, PObj);
- CagdSetCagdFprintf(NULL);
- }
- break;
- default:
- sprintf(Line, "%-10s (%d) - Obj type error, type = %d",
- Name, Count, PObj->ObjType);
- PrintOneLine(Line);
- break;
- }
- }
-
- /*****************************************************************************
- * Print some usefull info on all the given objects. *
- *****************************************************************************/
- void PrintObjectList(ObjectStruct *PObj)
- {
- PrintOneLine("");
-
- while (PObj != NULL) {
- PrintObject(PObj);
- PObj = PObj -> Pnext;
- }
- }
-
- /*****************************************************************************
- * Generate one polygonal object: *
- *****************************************************************************/
- ObjectStruct *GenPolyObject(char *Name, PolygonStruct *Pl, ObjectStruct *Pnext)
- {
- ObjectStruct *PObj;
-
- PObj = AllocObject(Name, POLY_OBJ, Pnext);
- ResetObjectAttribs(PObj); /* Initialize attributes. */
- RST_POLYLINE_OBJ(PObj); /* Default - not polyline object. */
-
- PObj -> U.Pl.P = Pl; /* Link the union part of it... */
-
- return PObj;
- }
-
- /*****************************************************************************
- * Generate one curve object: *
- *****************************************************************************/
- ObjectStruct *GenCrvObject(char *Name, CagdCrvStruct *Crv, ObjectStruct *Pnext)
- {
- ObjectStruct *PObj;
-
- PObj = AllocObject(Name, CURVE_OBJ, Pnext);
- ResetObjectAttribs(PObj); /* Initialize attributes. */
-
- PObj -> U.Crv.Crv = Crv; /* Link the union part of it... */
- PObj -> U.Crv.PLPolys = NULL;
- PObj -> U.Crv.CtlPoly = NULL;
-
- return PObj;
- }
-
- /*****************************************************************************
- * Generate one surface object: *
- *****************************************************************************/
- ObjectStruct *GenSrfObject(char *Name, CagdSrfStruct *Srf, ObjectStruct *Pnext)
- {
- ObjectStruct *PObj;
-
- PObj = AllocObject(Name, SURFACE_OBJ, Pnext);
- ResetObjectAttribs(PObj); /* Initialize attributes. */
-
- PObj -> U.Srf.Srf = Srf; /* Link the union part of it... */
- PObj -> U.Srf.PLPolys = NULL;
- PObj -> U.Srf.CtlMesh = NULL;
- PObj -> U.Srf.Polygons = NULL;
-
- return PObj;
- }
-
- /*****************************************************************************
- * Generate one control point object: *
- * Only one of CagdCoords/Coords should be specified. *
- *****************************************************************************/
- ObjectStruct *GenCtlPtObject(char *Name, CagdPointType PtType,
- CagdRType *CagdCoords, RealType *Coords, ObjectStruct *Pnext)
- {
- int i;
- CagdBType
- IsNotRational = !CAGD_IS_RATIONAL_PT(PtType);
- ObjectStruct *PObj;
- RealType *t;
-
- PObj = AllocObject(Name, CTLPT_OBJ, Pnext);
- PObj -> U.CtlPt.PtType = PtType;
- t = PObj -> U.CtlPt.Coords;
-
- if (CagdCoords != NULL)
- for (i = IsNotRational;
- i <= CAGD_NUM_OF_PT_COORD(PtType);
- i++) t[i] = CagdCoords[i];
- else
- for (i = IsNotRational;
- i <= CAGD_NUM_OF_PT_COORD(PtType);
- i++) t[i] = Coords[i];
-
- return PObj;
- }
-
- /*****************************************************************************
- * Generate one numeric object: *
- *****************************************************************************/
- ObjectStruct *GenNumObject(char *Name, RealType *R, ObjectStruct *Pnext)
- {
- ObjectStruct *PObj;
-
- PObj = AllocObject(Name, NUMERIC_OBJ, Pnext);
-
- PObj -> U.R = *R; /* Link the union part of it... */
-
- return PObj;
- }
-
- /*****************************************************************************
- * Generate one vector object: *
- *****************************************************************************/
- ObjectStruct *GenVecObject(char *Name, RealType *Vec0, RealType *Vec1,
- RealType *Vec2, ObjectStruct *Pnext)
- {
- ObjectStruct *PObj;
-
- PObj = AllocObject(Name, VECTOR_OBJ, Pnext);
-
- PObj -> U.Vec[0] = *Vec0; /* Link the union part of it... */
- PObj -> U.Vec[1] = *Vec1;
- PObj -> U.Vec[2] = *Vec2;
-
- return PObj;
- }
-
- /*****************************************************************************
- * Generate one matrix object: *
- *****************************************************************************/
- ObjectStruct *GenMatObject(char *Name, MatrixType Mat, ObjectStruct *Pnext)
- {
- int i, j;
- ObjectStruct *PObj;
-
- PObj = AllocObject(Name, MATRIX_OBJ, Pnext);
-
- for (i = 0; i < 4; i++) /* Link the union part of it... */
- for (j = 0; j < 4; j++) PObj -> U.Mat[i][j] = Mat[i][j];
-
- return PObj;
- }
-
- /*****************************************************************************
- * Routine to create a whole new copy of an object Src into Dest. *
- * if Dest is NULL, new object is allocated, otherwise Dest itself is updated *
- * If CopyAll then all the record is copied, otherwise, only its variant *
- * element (i.e. no Name/Pnext coping) is been copied. *
- *****************************************************************************/
- ObjectStruct *CopyObject(ObjectStruct *Dest, ObjectStruct *Src, int CopyAll)
- {
- int index;
- char Line[LINE_LEN];
-
- if (Dest == NULL)
- Dest = AllocObject("", Src->ObjType, NULL);
- else {
- Dest->ObjType = Src->ObjType;
- }
-
- if (Dest == Src) return Dest; /* Called with same object - ignore. */
-
- if (CopyAll) {
- strcpy(Dest->Name, Src->Name);
- Dest->Pnext = Src->Pnext; /* Maybe assigning NULL is better!? */
- }
-
- switch (Src->ObjType) {
- case POLY_OBJ:
- Dest->U.Pl.P = CopyPolygonList(Src->U.Pl.P);
- CopyGeomAttrib(Dest, Src);
- Dest->U.Pl.IsPolyline = Src->U.Pl.IsPolyline;
- break;
- case NUMERIC_OBJ:
- Dest->U.R = Src->U.R;
- break;
- case VECTOR_OBJ:
- PT_COPY(Dest->U.Vec, Src->U.Vec);
- break;
- case CTLPT_OBJ:
- GEN_COPY(&Dest->U.CtlPt, &Src->U.CtlPt,
- CAGD_MAX_PT_SIZE * sizeof(RealType));
- break;
- case MATRIX_OBJ:
- MAT_COPY(Dest->U.Mat, Src->U.Mat);
- break;
- case STRING_OBJ:
- strcpy(Dest->U.Str, Src->U.Str);
- break;
- case OBJ_LIST_OBJ:
- GEN_COPY(Dest->U.PObjList, Src->U.PObjList,
- MAX_OBJ_LIST * sizeof(ObjectStruct *));
- index = 0;
- while (index < MAX_OBJ_LIST &&
- Dest -> U.PObjList[index] != NULL)
- Dest -> U.PObjList[index++] -> Count++; /* Inc. # of ref. */
- break;
- case CURVE_OBJ:
- Dest->U.Crv.Crv = CagdCrvCopy(Src->U.Crv.Crv);
- Dest->U.Crv.PLPolys = NULL;
- Dest->U.Crv.CtlPoly = NULL;
- CopyGeomAttrib(Dest, Src);
- break;
- case SURFACE_OBJ:
- Dest->U.Srf.Srf = CagdSrfCopy(Src->U.Srf.Srf);
- Dest->U.Srf.PLPolys = NULL;
- Dest->U.Srf.CtlMesh = NULL;
- Dest->U.Srf.Polygons = NULL;
- CopyGeomAttrib(Dest, Src);
- break;
- default:
- sprintf(Line,
- "CopyObject Attemp to copy undefined object %s type %d\n",
- Src->Name, Src->ObjType);
- FatalError(Line);
- }
- return Dest;
- }
-
- /*****************************************************************************
- * Routine to generate a new copy of an object polygon list. *
- *****************************************************************************/
- PolygonStruct *CopyPolygonList(PolygonStruct *Src)
- {
- PolygonStruct *Phead, *Ptail;
-
- if (Src == NULL) return NULL;
-
- /* Prepare the header of the new polygon list: */
- Phead = Ptail = AllocPolygon(1, Src->Tags, CopyVList(Src->V), NULL);
- PLANE_COPY(Ptail -> Plane, Src -> Plane);
- Src = Src -> Pnext;
-
- while (Src != NULL) {
- Ptail -> Pnext = AllocPolygon(Src->Count, Src->Tags,
- CopyVList(Src->V), NULL);
- Ptail = Ptail -> Pnext;
- PLANE_COPY(Ptail -> Plane, Src -> Plane);
- Src = Src -> Pnext;
- }
-
- return Phead;
- }
-
- /*****************************************************************************
- * Routine to generate a new copy of a polygon vertices list. *
- *****************************************************************************/
- VertexStruct *CopyVList(VertexStruct *Src)
- {
- VertexStruct *Phead, *Ptail,
- *SrcFirst = Src;
-
- if (Src == NULL) return NULL;
-
- /* Prepare the header of the new vertex list: */
- Phead = Ptail = AllocVertex(Src -> Count, Src -> Tags, NULL, NULL);
- PT_COPY(Phead -> Pt, Src -> Pt);
- PT_COPY(Phead -> Normal, Src -> Normal);
- Src = Src -> Pnext;
-
- while (Src != SrcFirst && Src != NULL) {
- Ptail -> Pnext = AllocVertex(Src -> Count, Src -> Tags, NULL, NULL);
- Ptail = Ptail -> Pnext;
- PT_COPY(Ptail -> Pt, Src -> Pt);
- PT_COPY(Ptail -> Normal, Src -> Normal);
-
- Src = Src -> Pnext;
- }
-
- if (Src == SrcFirst) Ptail -> Pnext = Phead;/* Make vertex list circular.*/
-
- return Phead;
- }
-