1 |
/* Copyright (c) 1998 Silicon Graphics, Inc. */ |
2 |
|
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#ifndef lint |
4 |
static char SCCSid[] = "$SunId$ SGI"; |
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#endif |
6 |
|
7 |
/* |
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* sm_del.c |
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*/ |
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#include "standard.h" |
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|
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#include "sm_list.h" |
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#include "sm_geom.h" |
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#include "sm.h" |
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|
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static EDGE Edges[MAX_EDGES]; |
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static int Ecnt=0; |
18 |
|
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int |
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remove_tri(qtptr,fptr,t_id) |
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QUADTREE *qtptr; |
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int *fptr; |
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int t_id; |
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{ |
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OBJECT tset[QT_MAXSET+1]; |
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int n; |
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|
28 |
if(QT_IS_EMPTY(*qtptr)) |
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return(FALSE); |
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/* remove id from set */ |
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else |
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{ |
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if(!qtinset(*qtptr,t_id)) |
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return(FALSE); |
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n = QT_SET_CNT(qtqueryset(*qtptr))-1; |
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*qtptr = qtdelelem(*qtptr,t_id); |
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if(n == 0) |
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(*fptr) |= QT_COMPRESS; |
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if(!QT_FLAG_FILL_TRI(*fptr)) |
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(*fptr)++; |
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} |
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return(TRUE); |
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} |
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|
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int |
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remove_tri_compress(qtptr,q0,q1,q2,t0,t1,t2,n,arg,t_id) |
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QUADTREE *qtptr; |
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FVECT q0,q1,q2; |
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FVECT t0,t1,t2; |
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int n; |
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int *arg; |
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int t_id; |
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{ |
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int f = 0; |
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/* NOTE compress */ |
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return(remove_tri(qtptr,&f,t_id)); |
57 |
} |
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|
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|
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|
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int |
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stDelete_tri(st,t_id,t0,t1,t2) |
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STREE *st; |
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int t_id; |
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FVECT t0,t1,t2; |
66 |
{ |
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int f; |
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FVECT dir; |
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|
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/* First add all of the leaf cells lying on the triangle perimeter: |
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mark all cells seen on the way |
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*/ |
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ST_CLEAR_FLAGS(st); |
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f = 0; |
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VSUB(dir,t1,t0); |
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stTrace_edge(st,t0,dir,1.0,remove_tri,&f,t_id); |
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VSUB(dir,t2,t1); |
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stTrace_edge(st,t1,dir,1.0,remove_tri,&f,t_id); |
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VSUB(dir,t0,t2); |
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stTrace_edge(st,t2,dir,1.0,remove_tri,&f,t_id); |
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/* Now visit interior */ |
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if(QT_FLAG_FILL_TRI(f) || QT_FLAG_UPDATE(f)) |
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stVisit_tri_interior(st,t0,t1,t2,remove_tri_compress,&f,t_id); |
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} |
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|
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|
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smLocator_remove_tri(sm,t_id) |
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SM *sm; |
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int t_id; |
90 |
{ |
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STREE *st; |
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char found; |
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TRI *t; |
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FVECT v0,v1,v2; |
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|
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st = SM_LOCATOR(sm); |
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|
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t = SM_NTH_TRI(sm,t_id); |
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|
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VSUB(v0,SM_T_NTH_WV(sm,t,0),SM_VIEW_CENTER(sm)); |
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VSUB(v1,SM_T_NTH_WV(sm,t,1),SM_VIEW_CENTER(sm)); |
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VSUB(v2,SM_T_NTH_WV(sm,t,2),SM_VIEW_CENTER(sm)); |
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found = stUpdate_tri(st,t_id,v0,v1,v2,remove_tri,remove_tri_compress); |
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return(found); |
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} |
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|
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smFree_tri(sm,id) |
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SM *sm; |
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int id; |
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{ |
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TRI *tri; |
112 |
|
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tri = SM_NTH_TRI(sm,id); |
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/* Add to the free_list */ |
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T_NEXT_FREE(tri) = SM_FREE_TRIS(sm); |
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SM_FREE_TRIS(sm) = id; |
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T_VALID_FLAG(tri) = -1; |
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} |
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|
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/* Assumes mesh pointers have been cleaned up appropriately: just deletes from |
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Point location and triangle data structure |
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*/ |
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smDelete_tri(sm,t_id) |
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SM *sm; |
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int t_id; |
126 |
{ |
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|
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|
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/* NOTE: Assumes that a new triangle adjacent to each vertex |
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has been added- before the deletion: replacing |
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the old tri- and therefore dont need to dereference any pointers |
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to id because the vertices can no longer |
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point to tri id as being the first triangle pointer |
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*/ |
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if(!SM_IS_NTH_T_BASE(sm,t_id)) |
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{ |
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SM_NUM_TRIS(sm)--; |
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if(SM_IS_NTH_T_NEW(sm,t_id)) |
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smNew_tri_cnt--; |
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} |
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smClear_tri_flags(sm,t_id); |
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|
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smFree_tri(sm,t_id); |
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|
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} |
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|
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|
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|
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LIST |
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*smVertex_star_polygon(sm,id) |
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SM *sm; |
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int id; |
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{ |
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TRI *tri,*t_next; |
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LIST *elist,*end,*tlist; |
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int t_id,v_next,t_next_id; |
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int e; |
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|
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elist = end = NULL; |
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/* Get the first triangle adjacent to vertex id */ |
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t_id = SM_NTH_VERT(sm,id); |
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tri = SM_NTH_TRI(sm,t_id); |
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|
164 |
|
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if((e = eNew_edge()) == SM_INVALID) |
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{ |
167 |
#ifdef DEBUG |
168 |
eputs("smVertex_star_polygon():Too many edges\n"); |
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#endif |
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return(NULL); |
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} |
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elist = add_data_to_circular_list(elist,&end,e); |
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v_next = (T_WHICH_V(tri,id)+1)%3; |
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SET_E_NTH_VERT(e,0,T_NTH_V(tri,v_next)); |
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SET_E_NTH_TRI(e,0,SM_INVALID); |
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SET_E_NTH_TRI(e,1,T_NTH_NBR(tri,v_next)); |
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v_next = (T_WHICH_V(tri,id)+2)%3; |
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SET_E_NTH_VERT(e,1,T_NTH_V(tri,v_next)); |
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|
180 |
|
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t_next_id = t_id; |
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t_next = tri; |
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|
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tlist = push_data(NULL,t_id); |
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|
186 |
while((t_next_id = smTri_next_ccw_nbr(sm,t_next,id)) != t_id) |
187 |
{ |
188 |
if((e = eNew_edge()) == SM_INVALID) |
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{ |
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#ifdef DEBUG |
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eputs("smVertex_star_polygon():Too many edges\n"); |
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#endif |
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return(NULL); |
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} |
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elist = add_data_to_circular_list(elist,&end,e); |
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t_next = SM_NTH_TRI(sm,t_next_id); |
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v_next = (T_WHICH_V(t_next,id)+1)%3; |
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SET_E_NTH_VERT(e,0,T_NTH_V(t_next,v_next)); |
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SET_E_NTH_TRI(e,0,SM_INVALID); |
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SET_E_NTH_TRI(e,1,T_NTH_NBR(t_next,v_next)); |
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v_next = (T_WHICH_V(t_next,id)+2)%3; |
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SET_E_NTH_VERT(e,1,T_NTH_V(t_next,v_next)); |
203 |
tlist = push_data(tlist,t_next_id); |
204 |
} |
205 |
while(tlist) |
206 |
{ |
207 |
t_id = (int)pop_list(&tlist); |
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/* first remove from point location structure */ |
209 |
smLocator_remove_tri(sm,t_id); |
210 |
smDelete_tri(sm,t_id); |
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} |
212 |
return(elist); |
213 |
} |
214 |
|
215 |
int |
216 |
smEdge_intersect_polygon(sm,v0,v1,l) |
217 |
SM *sm; |
218 |
FVECT v0,v1; |
219 |
LIST *l; |
220 |
{ |
221 |
FVECT e0,e1; |
222 |
int e,id_e0,id_e1; |
223 |
LIST *el,*eptr; |
224 |
|
225 |
/* Test the edges in l against v0v1 to see if v0v1 intersects |
226 |
any other edges |
227 |
*/ |
228 |
|
229 |
el = l; |
230 |
|
231 |
while(el) |
232 |
{ |
233 |
e = (int)LIST_DATA(el); |
234 |
id_e0 = E_NTH_VERT(e,0); |
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id_e1 = E_NTH_VERT(e,1); |
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/* NOTE: DO these need to be normalized? Just subtract center? */ |
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smDir(sm,e0,id_e0); |
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smDir(sm,e1,id_e1); |
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if(sedge_intersect(v0,v1,e0,e1)) |
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return(TRUE); |
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|
242 |
el = LIST_NEXT(el); |
243 |
if(el == l) |
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break; |
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} |
246 |
return(FALSE); |
247 |
} |
248 |
|
249 |
int |
250 |
smFind_next_convex_vertex(sm,id0,id1,v0,v1,l) |
251 |
SM *sm; |
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int id0,id1; |
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FVECT v0,v1; |
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LIST *l; |
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{ |
256 |
int e,id; |
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LIST *el; |
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FVECT v; |
259 |
|
260 |
/* starting with the end of edge at head of l, search sequentially for |
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vertex v such that v0v1v is a convex angle, and the edge v1v does |
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not intersect any other edges |
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*/ |
264 |
id = SM_INVALID; |
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el = l; |
266 |
while(id != id0) |
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{ |
268 |
e = (int)LIST_DATA(el); |
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id = E_NTH_VERT(e,1); |
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|
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smDir(sm,v,id); |
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|
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if(convex_angle(v0,v1,v) && !smEdge_intersect_polygon(sm,v1,v,l)) |
274 |
return(id); |
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|
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el = LIST_NEXT(el); |
277 |
if(el == l) |
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break; |
279 |
} |
280 |
return(SM_INVALID); |
281 |
} |
282 |
|
283 |
int |
284 |
split_edge_list(id0,id_new,l,lnew) |
285 |
int id0,id_new; |
286 |
LIST **l,**lnew; |
287 |
{ |
288 |
LIST *list,*lptr,*end; |
289 |
int e,e1,e2,new_e; |
290 |
|
291 |
e2 = SM_INVALID; |
292 |
list = lptr = *l; |
293 |
|
294 |
if((new_e = eNew_edge())==SM_INVALID) |
295 |
{ |
296 |
#ifdef DEBUG |
297 |
eputs("split_edge_list():Too many edges\n"); |
298 |
#endif |
299 |
return(FALSE); |
300 |
} |
301 |
SET_E_NTH_VERT(new_e,0,id0); |
302 |
SET_E_NTH_VERT(new_e,1,id_new); |
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SET_E_NTH_TRI(new_e,0,SM_INVALID); |
304 |
SET_E_NTH_TRI(new_e,1,SM_INVALID); |
305 |
|
306 |
while(e2 != id_new) |
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{ |
308 |
lptr = LIST_NEXT(lptr); |
309 |
e = (int)LIST_DATA(lptr); |
310 |
e2 = E_NTH_VERT(e,1); |
311 |
if(lptr == list) |
312 |
{ |
313 |
#ifdef DEBUG |
314 |
eputs("split_edge_list():cant find vertex\n"); |
315 |
#endif |
316 |
*lnew = NULL; |
317 |
return(FALSE); |
318 |
} |
319 |
|
320 |
} |
321 |
end = lptr; |
322 |
lptr = LIST_NEXT(lptr); |
323 |
list = add_data_to_circular_list(list,&end,-new_e); |
324 |
*lnew = list; |
325 |
|
326 |
/* now follow other cycle */ |
327 |
|
328 |
list = lptr; |
329 |
e2 = SM_INVALID; |
330 |
while(e2 != id0) |
331 |
{ |
332 |
lptr = LIST_NEXT(lptr); |
333 |
e = (int)LIST_DATA(lptr); |
334 |
e2 = E_NTH_VERT(e,1); |
335 |
if(lptr == list) |
336 |
{ |
337 |
#ifdef DEBUG |
338 |
eputs("split_edge_list():cant find intial vertex\n"); |
339 |
#endif |
340 |
*l = NULL; |
341 |
return(FALSE); |
342 |
} |
343 |
|
344 |
} |
345 |
end = lptr; |
346 |
list = add_data_to_circular_list(list,&end,new_e); |
347 |
*l = list; |
348 |
return(TRUE); |
349 |
} |
350 |
|
351 |
|
352 |
int |
353 |
smTriangulate_convex(sm,plist) |
354 |
SM *sm; |
355 |
LIST *plist; |
356 |
{ |
357 |
TRI *tri; |
358 |
int t_id,e_id0,e_id1,e_id2; |
359 |
int v_id0,v_id1,v_id2; |
360 |
LIST *lptr; |
361 |
int cnt; |
362 |
|
363 |
lptr = plist; |
364 |
e_id0 = (int)LIST_DATA(lptr); |
365 |
v_id0 = E_NTH_VERT(e_id0,0); |
366 |
lptr = LIST_NEXT(lptr); |
367 |
while(LIST_NEXT(lptr) != plist) |
368 |
{ |
369 |
e_id1 = (int)LIST_DATA(lptr); |
370 |
v_id1 = E_NTH_VERT(e_id1,0); |
371 |
v_id2 = E_NTH_VERT(e_id1,1); |
372 |
/* form a triangle for each triple of with v0 as base of star */ |
373 |
t_id = smAdd_tri(sm,v_id0,v_id1,v_id2,&tri); |
374 |
smLocator_add_tri(sm,t_id,v_id0,v_id1,v_id2); |
375 |
/* add which pointer?*/ |
376 |
|
377 |
lptr = LIST_NEXT(lptr); |
378 |
|
379 |
if(LIST_NEXT(lptr) != plist) |
380 |
{ |
381 |
e_id2 = eNew_edge(); |
382 |
SET_E_NTH_VERT(e_id2,0,v_id2); |
383 |
SET_E_NTH_VERT(e_id2,1,v_id0); |
384 |
} |
385 |
else |
386 |
e_id2 = (int)LIST_DATA(lptr); |
387 |
|
388 |
/* set appropriate tri for each edge*/ |
389 |
SET_E_NTH_TRI(e_id0,0,t_id); |
390 |
SET_E_NTH_TRI(e_id1,0,t_id); |
391 |
SET_E_NTH_TRI(e_id2,0,t_id); |
392 |
|
393 |
e_id0 = -e_id2; |
394 |
} |
395 |
|
396 |
free_list(plist); |
397 |
return(TRUE); |
398 |
} |
399 |
int |
400 |
smTriangulate_elist(sm,plist) |
401 |
SM *sm; |
402 |
LIST *plist; |
403 |
{ |
404 |
LIST *l,*el1; |
405 |
FVECT v0,v1,v2; |
406 |
int id0,id1,id2,e,id_next; |
407 |
char flipped; |
408 |
int done; |
409 |
|
410 |
l = plist; |
411 |
|
412 |
while(l) |
413 |
{ |
414 |
/* get v0,v1,v2 */ |
415 |
e = (int)LIST_DATA(l); |
416 |
id0 = E_NTH_VERT(e,0); |
417 |
id1 = E_NTH_VERT(e,1); |
418 |
l = LIST_NEXT(l); |
419 |
e = (int)LIST_DATA(l); |
420 |
id2 = E_NTH_VERT(e,1); |
421 |
|
422 |
smDir(sm,v0,id0); |
423 |
smDir(sm,v1,id1); |
424 |
smDir(sm,v2,id2); |
425 |
/* determine if convex (left turn), or concave(right turn) angle */ |
426 |
if(convex_angle(v0,v1,v2)) |
427 |
{ |
428 |
if(l == plist) |
429 |
break; |
430 |
else |
431 |
continue; |
432 |
} |
433 |
/* if concave: add edge and recurse on two sub polygons */ |
434 |
id_next = smFind_next_convex_vertex(sm,id0,id1,v0,v1,LIST_NEXT(l)); |
435 |
if(id_next == SM_INVALID) |
436 |
{ |
437 |
#ifdef DEBUG |
438 |
eputs("smTriangulate_elist():Unable to find convex vertex\n"); |
439 |
#endif |
440 |
return(FALSE); |
441 |
} |
442 |
/* add edge */ |
443 |
el1 = NULL; |
444 |
/* Split edge list l into two lists: one from id1-id_next-id1, |
445 |
and the next from id2-id_next-id2 |
446 |
*/ |
447 |
split_edge_list(id1,id_next,&l,&el1); |
448 |
/* Recurse and triangulate the two edge lists */ |
449 |
done = smTriangulate_elist(sm,l); |
450 |
if(done) |
451 |
done = smTriangulate_elist(sm,el1); |
452 |
return(done); |
453 |
} |
454 |
done = smTriangulate_convex(sm,plist); |
455 |
return(done); |
456 |
} |
457 |
|
458 |
int |
459 |
smTriangulate(sm,plist) |
460 |
SM *sm; |
461 |
LIST *plist; |
462 |
{ |
463 |
int e,id_t0,id_t1,e0,e1; |
464 |
TRI *t0,*t1; |
465 |
int test; |
466 |
|
467 |
test = smTriangulate_elist(sm,plist); |
468 |
|
469 |
if(!test) |
470 |
return(test); |
471 |
FOR_ALL_EDGES(e) |
472 |
{ |
473 |
id_t0 = E_NTH_TRI(e,0); |
474 |
id_t1 = E_NTH_TRI(e,1); |
475 |
if((id_t0==SM_INVALID) || (id_t1==SM_INVALID)) |
476 |
{ |
477 |
#ifdef DEBUG |
478 |
eputs("smTriangulate(): Unassigned edge neighbor\n"); |
479 |
#endif |
480 |
continue; |
481 |
} |
482 |
t0 = SM_NTH_TRI(sm,id_t0); |
483 |
t1 = SM_NTH_TRI(sm,id_t1); |
484 |
|
485 |
e0 = T_WHICH_V(t0,E_NTH_VERT(e,0)); |
486 |
T_NTH_NBR(t0,e0) = id_t1; |
487 |
|
488 |
e1 = T_WHICH_V(t1,E_NTH_VERT(e,1)); |
489 |
T_NTH_NBR(t1,e1) = id_t0; |
490 |
} |
491 |
return(test); |
492 |
} |
493 |
|
494 |
eIn_tri(e,t) |
495 |
int e; |
496 |
TRI *t; |
497 |
{ |
498 |
|
499 |
if(T_NTH_V(t,0)==E_NTH_VERT(e,0)) |
500 |
return(T_NTH_V(t,1)==E_NTH_VERT(e,1)||T_NTH_V(t,2)==E_NTH_VERT(e,1)); |
501 |
else |
502 |
if(T_NTH_V(t,1)==E_NTH_VERT(e,0)) |
503 |
return(T_NTH_V(t,0)==E_NTH_VERT(e,1)||T_NTH_V(t,2)==E_NTH_VERT(e,1)); |
504 |
else if(T_NTH_V(t,2)==E_NTH_VERT(e,0)) |
505 |
return(T_NTH_V(t,0)==E_NTH_VERT(e,1)||T_NTH_V(t,1)==E_NTH_VERT(e,1)); |
506 |
return(FALSE); |
507 |
} |
508 |
smFix_edges(sm) |
509 |
SM *sm; |
510 |
{ |
511 |
int e,id_t0,id_t1,e_new,e0,e1,e0_next,e1_next; |
512 |
TRI *t0,*t1,*nt0,*nt1; |
513 |
int i,id_v0,id_v1,id_v2,id_p,nid_t0,nid_t1; |
514 |
FVECT v0,v1,v2,p,np,v; |
515 |
LIST *add,*del; |
516 |
|
517 |
add = del = NULL; |
518 |
FOR_ALL_EDGES(e) |
519 |
{ |
520 |
id_t0 = E_NTH_TRI(e,0); |
521 |
id_t1 = E_NTH_TRI(e,1); |
522 |
if((id_t0==SM_INVALID) || (id_t1==SM_INVALID)) |
523 |
{ |
524 |
#ifdef DEBUG |
525 |
eputs("smFix_edges: Unassigned edge nbr\n"); |
526 |
#endif |
527 |
continue; |
528 |
} |
529 |
t0 = SM_NTH_TRI(sm,id_t0); |
530 |
t1 = SM_NTH_TRI(sm,id_t1); |
531 |
|
532 |
e0 = T_WHICH_V(t0,E_NTH_VERT(e,0)); |
533 |
e1 = T_WHICH_V(t1,E_NTH_VERT(-e,0)); |
534 |
e0_next = (e0+2)%3; |
535 |
e1_next = (e1+2)%3; |
536 |
id_v0 = E_NTH_VERT(e,0); |
537 |
id_v1 = E_NTH_VERT(e,1); |
538 |
id_v2 = T_NTH_V(t0,e0_next); |
539 |
id_p = T_NTH_V(t1,e1_next); |
540 |
|
541 |
smDir(sm,v0,id_v0); |
542 |
smDir(sm,v1,id_v1); |
543 |
smDir(sm,v2,id_v2); |
544 |
|
545 |
VCOPY(p,SM_NTH_WV(sm,id_p)); |
546 |
VSUB(p,p,SM_VIEW_CENTER(sm)); |
547 |
if(point_in_cone(p,v0,v1,v2)) |
548 |
{ |
549 |
smTris_swap_edge(sm,id_t0,id_t1,e0,e1,&nid_t0,&nid_t1,&add,&del); |
550 |
|
551 |
nt0 = SM_NTH_TRI(sm,nid_t0); |
552 |
nt1 = SM_NTH_TRI(sm,nid_t1); |
553 |
FOR_ALL_EDGES_FROM(e,i) |
554 |
{ |
555 |
if(E_NTH_TRI(i,0)==id_t0 || E_NTH_TRI(i,0)==id_t1) |
556 |
{ |
557 |
if(eIn_tri(i,nt0)) |
558 |
SET_E_NTH_TRI(i,0,nid_t0); |
559 |
else |
560 |
SET_E_NTH_TRI(i,0,nid_t1); |
561 |
} |
562 |
|
563 |
if(E_NTH_TRI(i,1)==id_t0 || E_NTH_TRI(i,1)==id_t1) |
564 |
{ |
565 |
if(eIn_tri(i,nt0)) |
566 |
SET_E_NTH_TRI(i,1,nid_t0); |
567 |
else |
568 |
SET_E_NTH_TRI(i,1,nid_t1); |
569 |
} |
570 |
} |
571 |
id_t0 = nid_t0; |
572 |
id_t1 = nid_t1; |
573 |
e_new = eNew_edge(); |
574 |
SET_E_NTH_VERT(e_new,0,id_p); |
575 |
SET_E_NTH_VERT(e_new,1,id_v2); |
576 |
SET_E_NTH_TRI(e_new,0,id_t0); |
577 |
SET_E_NTH_TRI(e_new,1,id_t1); |
578 |
} |
579 |
} |
580 |
smUpdate_locator(sm,add,del); |
581 |
} |
582 |
|
583 |
int |
584 |
smMesh_remove_vertex(sm,id) |
585 |
SM *sm; |
586 |
int id; |
587 |
{ |
588 |
int tri; |
589 |
LIST *elist; |
590 |
int cnt,debug; |
591 |
/* generate list of vertices that form the boundary of the |
592 |
star polygon formed by vertex id and all of its adjacent |
593 |
triangles |
594 |
*/ |
595 |
eClear_edges(); |
596 |
elist = smVertex_star_polygon(sm,id); |
597 |
if(!elist) |
598 |
return(FALSE); |
599 |
|
600 |
/* Triangulate spherical polygon */ |
601 |
smTriangulate(sm,elist); |
602 |
|
603 |
|
604 |
/* Fix up new triangles to be Delaunay */ |
605 |
smFix_edges(sm); |
606 |
|
607 |
return(TRUE); |
608 |
} |
609 |
|
610 |
/* Remove point from samples, and from mesh. Delete any triangles |
611 |
adjacent to the point and re-triangulate the hole |
612 |
Return TRUE is point found , FALSE otherwise |
613 |
*/ |
614 |
int |
615 |
smDelete_point(sm,id) |
616 |
SM *sm; |
617 |
int id; |
618 |
{ |
619 |
|
620 |
/* Remove the corresponding vertex from the mesh */ |
621 |
smMesh_remove_vertex(sm,id); |
622 |
/* Free the sample point */ |
623 |
smDelete_sample(sm,id); |
624 |
return(TRUE); |
625 |
} |
626 |
|
627 |
|
628 |
|
629 |
|
630 |
|
631 |
|
632 |
|
633 |
|
634 |
|
635 |
|
636 |
|
637 |
|
638 |
|
639 |
|