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diff --git a/src/glu/sgi/libnurbs/nurbtess/polyDBG.cc b/src/glu/sgi/libnurbs/nurbtess/polyDBG.cc
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+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+**
+** http://oss.sgi.com/projects/FreeB
+**
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+**
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+**
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+**
+** $Date: 2001/03/17 00:25:41 $ $Revision: 1.1 $
+*/
+/*
+** $Header: /home/krh/git/sync/mesa-cvs-repo/Mesa/src/glu/sgi/libnurbs/nurbtess/polyDBG.cc,v 1.1 2001/03/17 00:25:41 brianp Exp $
+*/
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <math.h>
+#include "zlassert.h"
+#include "polyDBG.h"
+
+
+static Real area(Real A[2], Real B[2], Real C[2])
+{
+ Real Bx, By, Cx, Cy;
+ Bx = B[0] - A[0];
+ By = B[1] - A[1];
+ Cx = C[0] - A[0];
+ Cy = C[1] - A[1];
+ return Bx*Cy - Cx*By;
+}
+
+Int DBG_isConvex(directedLine *poly)
+{
+ directedLine* temp;
+ if(area(poly->head(), poly->tail(), poly->getNext()->tail()) < 0.00000)
+ return 0;
+ for(temp = poly->getNext(); temp != poly; temp = temp->getNext())
+ {
+ if(area(temp->head(), temp->tail(), temp->getNext()->tail()) < 0.00000)
+ return 0;
+ }
+ return 1;
+}
+
+Int DBG_is_U_monotone(directedLine* poly)
+{
+ Int n_changes = 0;
+ Int prev_sign;
+ Int cur_sign;
+ directedLine* temp;
+ cur_sign = compV2InX(poly->tail(), poly->head());
+
+ n_changes = (compV2InX(poly->getPrev()->tail(), poly->getPrev()->head())
+ != cur_sign);
+
+ for(temp = poly->getNext(); temp != poly; temp = temp->getNext())
+ {
+ prev_sign = cur_sign;
+ cur_sign = compV2InX(temp->tail(), temp->head());
+
+ if(cur_sign != prev_sign)
+ n_changes++;
+ }
+
+ if(n_changes ==2) return 1;
+ else return 0;
+}
+
+/*if u-monotone, and there is a long horizontal edge*/
+Int DBG_is_U_direction(directedLine* poly)
+{
+/*
+ if(! DBG_is_U_monotone(poly))
+ return 0;
+*/
+ Int V_count = 0;
+ Int U_count = 0;
+ directedLine* temp;
+ if( fabs(poly->head()[0] - poly->tail()[0]) <= fabs(poly->head()[1]-poly->tail()[1]))
+ V_count += poly->get_npoints();
+ else
+ U_count += poly->get_npoints();
+ /*
+ else if(poly->head()[1] == poly->tail()[1])
+ U_count += poly->get_npoints();
+ */
+ for(temp = poly->getNext(); temp != poly; temp = temp->getNext())
+ {
+ if( fabs(temp->head()[0] - temp->tail()[0]) <= fabs(temp->head()[1]-temp->tail()[1]))
+ V_count += temp->get_npoints();
+ else
+ U_count += temp->get_npoints();
+ /*
+ if(temp->head()[0] == temp->tail()[0])
+ V_count += temp->get_npoints();
+ else if(temp->head()[1] == temp->tail()[1])
+ U_count += temp->get_npoints();
+ */
+ }
+
+ if(U_count > V_count) return 1;
+ else return 0;
+}
+
+/*given two line segments, determine whether
+ *they intersect each other or not.
+ *return 1 if they do,
+ *return 0 otherwise
+ */
+Int DBG_edgesIntersect(directedLine* l1, directedLine* l2)
+{
+ if(l1->getNext() == l2)
+ {
+ if(area(l1->head(), l1->tail(), l2->tail()) == 0) //colinear
+ {
+ if( (l1->tail()[0] - l1->head()[0])*(l2->tail()[0]-l2->head()[0]) +
+ (l1->tail()[1] - l1->head()[1])*(l2->tail()[1]-l2->head()[1]) >=0)
+ return 0; //not intersect
+ else
+ return 1;
+ }
+ //else we use the normal code
+ }
+ else if(l1->getPrev() == l2)
+ {
+ if(area(l2->head(), l2->tail(), l1->tail()) == 0) //colinear
+ {
+ if( (l2->tail()[0] - l2->head()[0])*(l1->tail()[0]-l1->head()[0]) +
+ (l2->tail()[1] - l2->head()[1])*(l1->tail()[1]-l1->head()[1]) >=0)
+ return 0; //not intersect
+ else
+ return 1;
+ }
+ //else we use the normal code
+ }
+ else //the two edges are not connected
+ {
+ if((l1->head()[0] == l2->head()[0] &&
+ l1->head()[1] == l2->head()[1]) ||
+ (l1->tail()[0] == l2->tail()[0] &&
+ l1->tail()[1] == l2->tail()[1]))
+ return 1;
+
+ }
+
+
+ if(
+ (
+ area(l1->head(), l1->tail(), l2->head())
+ *
+ area(l1->head(), l1->tail(), l2->tail())
+ < 0
+ )
+ &&
+ (
+ area(l2->head(), l2->tail(), l1->head())
+ *area(l2->head(), l2->tail(), l1->tail())
+ < 0
+ )
+ )
+ return 1;
+ else
+ return 0;
+}
+
+/*whether AB and CD intersect
+ *return 1 if they do
+ *retur 0 otheriwse
+ */
+Int DBG_edgesIntersectGen(Real A[2], Real B[2], Real C[2], Real D[2])
+{
+ if(
+ (
+ area(A, B, C) * area(A,B,D) <0
+ )
+ &&
+ (
+ area(C,D,A) * area(C,D,B) < 0
+ )
+ )
+ return 1;
+ else
+ return 0;
+}
+
+/*determien whether (A,B) interesect chain[start] to [end]
+ */
+Int DBG_intersectChain(vertexArray* chain, Int start, Int end, Real A[2], Real B[2])
+{
+ Int i;
+ for(i=start; i<=end-2; i++)
+ if(DBG_edgesIntersectGen(chain->getVertex(i), chain->getVertex(i+1), A, B))
+ return 1;
+
+ return 0;
+}
+
+/*determine whether a polygon intersect itself or not
+ *return 1 is it does,
+ * 0 otherwise
+ */
+Int DBG_polygonSelfIntersect(directedLine* poly)
+{
+ directedLine* temp1;
+ directedLine* temp2;
+ temp1=poly;
+ for(temp2=temp1->getNext(); temp2 != temp1; temp2=temp2->getNext())
+ {
+ if(DBG_edgesIntersect(temp1, temp2))
+ {
+ return 1;
+ }
+
+ }
+
+ for(temp1=poly->getNext(); temp1 != poly; temp1 = temp1->getNext())
+ for(temp2=temp1->getNext(); temp2 != temp1; temp2=temp2->getNext())
+ {
+ if(DBG_edgesIntersect(temp1, temp2))
+ {
+ return 1;
+ }
+ }
+ return 0;
+}
+
+/*check whether a line segment intersects a polygon
+ */
+Int DBG_edgeIntersectPoly(directedLine* edge, directedLine* poly)
+{
+ directedLine* temp;
+ if(DBG_edgesIntersect(edge, poly))
+ return 1;
+ for(temp=poly->getNext(); temp != poly; temp=temp->getNext())
+ if(DBG_edgesIntersect(edge, temp))
+ return 1;
+ return 0;
+}
+
+/*check whether two polygons intersect
+ */
+Int DBG_polygonsIntersect(directedLine* p1, directedLine* p2)
+{
+ directedLine* temp;
+ if(DBG_edgeIntersectPoly(p1, p2))
+ return 1;
+ for(temp=p1->getNext(); temp!= p1; temp = temp->getNext())
+ if(DBG_edgeIntersectPoly(temp, p2))
+ return 1;
+ return 0;
+}
+
+/*check whether there are polygons intersecting each other in
+ *a list of polygons
+ */
+Int DBG_polygonListIntersect(directedLine* pList)
+{
+ directedLine *temp;
+ for(temp=pList; temp != NULL; temp = temp->getNextPolygon())
+ if(DBG_polygonSelfIntersect(temp))
+ return 1;
+ directedLine* temp2;
+ for(temp=pList; temp!=NULL; temp=temp->getNextPolygon())
+ {
+ for(temp2=temp->getNextPolygon(); temp2 != NULL; temp2=temp2->getNextPolygon())
+ if(DBG_polygonsIntersect(temp, temp2))
+ return 1;
+ }
+
+ return 0;
+}
+
+
+Int DBG_isCounterclockwise(directedLine* poly)
+{
+ return (poly->polyArea() > 0);
+}
+
+/*ray: v0 with direction (dx,dy).
+ *edge: v1-v2.
+ * the extra point v10[2] is given for the information at
+ *v1. Basically this edge is connectd to edge
+ * v10-v1. If v1 is on the ray,
+ * then we need v10 to determine whether this ray intersects
+ * the edge or not (that is, return 1 or return 0).
+ * If v1 is on the ray, then if v2 and v10 are on the same side of the ray,
+ * we return 0, otherwise return 1.
+ *For v2, if v2 is on the ray, we always return 0.
+ *Notice that v1 and v2 are not symmetric. So the edge is directed!!!
+ * The purpose for this convention is such that: a point is inside a polygon
+ * if and only if it intersets with odd number of edges.
+ */
+Int DBG_rayIntersectEdge(Real v0[2], Real dx, Real dy, Real v10[2], Real v1[2], Real v2[2])
+{
+/*
+if( (v1[1] >= v0[1] && v2[1]<= v0[1] )
+ ||(v2[1] >= v0[1] && v1[1]<= v0[1] )
+ )
+ printf("rayIntersectEdge, *********\n");
+*/
+
+ Real denom = (v2[0]-v1[0])*(-dy) - (v2[1]-v1[1]) * (-dx);
+ Real nomRay = (v2[0]-v1[0]) * (v0[1] - v1[1]) - (v2[1]-v1[1])*(v0[0]-v1[0]);
+ Real nomEdge = (v0[0]-v1[0]) * (-dy) - (v0[1]-v1[1])*(-dx);
+
+
+ /*if the ray is parallel to the edge, return 0: not intersect*/
+ if(denom == 0.0)
+ return 0;
+
+ /*if v0 is on the edge, return 0: not intersect*/
+ if(nomRay == 0.0)
+ return 0;
+
+ /*if v1 is on the positive ray, and the neighbor of v1 crosses the ray
+ *return 1: intersect
+ */
+ if(nomEdge == 0)
+ { /*v1 is on the positive or negative ray*/
+
+/*
+ printf("v1 is on the ray\n");
+*/
+
+ if(dx*(v1[0]-v0[0])>=0 && dy*(v1[1]-v0[1])>=0) /*v1 on positive ray*/
+ {
+ if(area(v0, v1, v10) * area(v0, v1, v2) >0)
+ return 0;
+ else
+ return 1;
+ }
+ else /*v1 on negative ray*/
+ return 0;
+ }
+
+ /*if v2 is on the ray, always return 0: not intersect*/
+ if(nomEdge == denom) {
+/* printf("v2 is on the ray\n");*/
+ return 0;
+ }
+
+ /*finally */
+ if(denom*nomRay>0 && denom*nomEdge>0 && nomEdge/denom <=1.0)
+ return 1;
+ return 0;
+}
+
+
+/*return the number of intersections*/
+Int DBG_rayIntersectPoly(Real v0[2], Real dx, Real dy, directedLine* poly)
+{
+ directedLine* temp;
+ Int count=0;
+ if(DBG_rayIntersectEdge(v0, dx, dy, poly->getPrev()->head(), poly->head(), poly->tail()))
+ count++;
+
+ for(temp=poly->getNext(); temp != poly; temp = temp->getNext())
+ if(DBG_rayIntersectEdge(v0, dx, dy, temp->getPrev()->head(), temp->head(), temp->tail()))
+ count++;
+/*printf("ray intersect poly: count=%i\n", count);*/
+ return count;
+}
+
+Int DBG_pointInsidePoly(Real v[2], directedLine* poly)
+{
+/*
+printf("enter pointInsidePoly , v=(%f,%f)\n", v[0], v[1]);
+printf("the polygon is\n");
+poly->printList();
+*/
+ /*for debug purpose*/
+ assert( (DBG_rayIntersectPoly(v,1,0,poly) % 2 )
+ == (DBG_rayIntersectPoly(v,1,0.1234, poly) % 2 )
+ );
+ if(DBG_rayIntersectPoly(v, 1, 0, poly) % 2 == 1)
+ return 1;
+ else
+ return 0;
+}
+
+/*return the number of polygons which contain thie polygon
+ * as a subset
+ */
+Int DBG_enclosingPolygons(directedLine* poly, directedLine* list)
+{
+ directedLine* temp;
+ Int count=0;
+/*
+printf("%i\n", DBG_pointInsidePoly(poly->head(),
+ list->getNextPolygon()
+ ->getNextPolygon()
+ ->getNextPolygon()
+ ->getNextPolygon()
+));
+*/
+
+ for(temp = list; temp != NULL; temp = temp->getNextPolygon())
+ {
+ if(poly != temp)
+ if(DBG_pointInsidePoly(poly->head(), temp))
+ count++;
+/* printf("count=%i\n", count);*/
+ }
+ return count;
+}
+
+void DBG_reverse(directedLine* poly)
+{
+ if(poly->getDirection() == INCREASING)
+ poly->putDirection(DECREASING);
+ else
+ poly->putDirection(INCREASING);
+
+ directedLine* oldNext = poly->getNext();
+ poly->putNext(poly->getPrev());
+ poly->putPrev(oldNext);
+
+ directedLine* temp;
+ for(temp=oldNext; temp!=poly; temp = oldNext)
+ {
+ if(temp->getDirection() == INCREASING)
+ temp->putDirection(DECREASING);
+ else
+ temp->putDirection(INCREASING);
+
+ oldNext = temp->getNext();
+ temp->putNext(temp->getPrev());
+ temp->putPrev(oldNext);
+ }
+ printf("reverse done\n");
+}
+
+Int DBG_checkConnectivity(directedLine *polygon)
+{
+ if(polygon == NULL) return 1;
+ directedLine* temp;
+ if(polygon->head()[0] != polygon->getPrev()->tail()[0] ||
+ polygon->head()[1] != polygon->getPrev()->tail()[1])
+ return 0;
+ for(temp=polygon->getNext(); temp != polygon; temp=temp->getNext())
+ {
+ if(temp->head()[0] != temp->getPrev()->tail()[0] ||
+ temp->head()[1] != temp->getPrev()->tail()[1])
+ return 0;
+ }
+ return 1;
+}
+
+/*print out error message.
+ *If it cannot modify the polygon list to make it satify the
+ *requirements, return 1.
+ *otherwise modify the polygon list, and return 0
+ */
+Int DBG_check(directedLine *polyList)
+{
+ directedLine* temp;
+ if(polyList == NULL) return 0;
+
+ /*if there are intersections, print out error message
+ */
+ if(DBG_polygonListIntersect(polyList))
+ {
+ fprintf(stderr, "DBG_check: there are self intersections, don't know to modify the polygons\n");
+ return 1;
+ }
+
+ /*check the connectivity of each polygon*/
+ for(temp = polyList; temp!= NULL; temp = temp ->getNextPolygon())
+ {
+ if(! DBG_checkConnectivity(temp))
+ {
+ fprintf(stderr, "DBG_check, polygon not connected\n");
+ return 1;
+ }
+ }
+
+ /*check the orientation of each polygon*/
+ for(temp = polyList; temp!= NULL; temp = temp ->getNextPolygon())
+ {
+
+
+ Int correctDir;
+
+ if( DBG_enclosingPolygons(temp, polyList) % 2 == 0)
+ correctDir = 1; /*counterclockwise*/
+ else
+ correctDir = 0; /*clockwise*/
+
+ Int actualDir = DBG_isCounterclockwise(temp);
+
+ if(correctDir != actualDir)
+ {
+ fprintf(stderr, "DBG_check: polygon with incorrect orientations. reversed\n");
+
+ DBG_reverse(temp);
+ }
+
+ }
+ return 0;
+}
+
+/**************handle self intersections*****************/
+//determine whether e interects [begin, end] or not
+static directedLine* DBG_edgeIntersectChainD(directedLine *e,
+ directedLine *begin, directedLine *end)
+{
+ directedLine *temp;
+ for(temp=begin; temp != end; temp = temp->getNext())
+ {
+ if(DBG_edgesIntersect(e, temp))
+ return temp;
+ }
+ if(DBG_edgesIntersect(e, end))
+ return end;
+ return NULL;
+}
+
+//given a polygon, cut the edges off and finally obtain a
+//a polygon without intersections. The cut-off edges are
+//dealloated. The new polygon is returned.
+directedLine* DBG_cutIntersectionPoly(directedLine *polygon, int& cutOccur)
+{
+ directedLine *begin, *end, *next;
+ begin = polygon;
+ end = polygon;
+ cutOccur = 0;
+ while( (next = end->getNext()) != begin)
+ {
+ directedLine *interc = NULL;
+ if( (interc = DBG_edgeIntersectChainD(next, begin, end)))
+ {
+ int fixed = 0;
+ if(DBG_edgesIntersect(next, interc->getNext()))
+ {
+ //trying to fix it
+ Real buf[2];
+ int i;
+ Int n=5;
+ buf[0] = interc->tail()[0];
+ buf[1] = interc->tail()[1];
+
+ for(i=1; i<n; i++)
+ {
+ Real r = ((Real)i) / ((Real) n);
+ Real u = (1-r) * interc->head()[0] + r * interc->tail()[0];
+ Real v = (1-r) * interc->head()[1] + r * interc->tail()[1];
+ interc->tail()[0] = interc->getNext()->head()[0] = u;
+ interc->tail()[1] = interc->getNext()->head()[1] = v;
+ if( (! DBG_edgesIntersect(next, interc)) &&
+ (! DBG_edgesIntersect(next, interc->getNext())))
+ break; //we fixed it
+ }
+ if(i==n) // we didn't fix it
+ {
+ fixed = 0;
+ //back to original
+ interc->tail()[0] = interc->getNext()->head()[0] = buf[0];
+ interc->tail()[1] = interc->getNext()->head()[1] = buf[1];
+ }
+ else
+ {
+ fixed = 1;
+ }
+ }
+ if(fixed == 0)
+ {
+ cutOccur = 1;
+ begin->deleteSingleLine(next);
+
+ if(begin != end)
+ {
+ if(DBG_polygonSelfIntersect(begin))
+ {
+ directedLine* newEnd = end->getPrev();
+ begin->deleteSingleLine(end);
+ end = newEnd;
+ }
+ }
+ }
+ else
+ {
+ end = end->getNext();
+ }
+ }
+ else
+ {
+ end = end->getNext();
+ }
+ }
+ return begin;
+}
+
+//given a polygon, cut the edges off and finally obtain a
+//a polygon without intersections. The cut-off edges are
+//dealloated. The new polygon is returned.
+static directedLine* DBG_cutIntersectionPoly_notwork(directedLine *polygon)
+{
+ directedLine *crt;//current polygon
+ directedLine *begin;
+ directedLine *end;
+ directedLine *temp;
+ crt = polygon;
+ int find=0;
+ while(1)
+ {
+//printf("loop\n");
+ //if there are less than 3 edges, we should stop
+ if(crt->getPrev()->getPrev() == crt)
+ return NULL;
+
+ if(DBG_edgesIntersect(crt, crt->getNext()) ||
+ (crt->head()[0] == crt->getNext()->tail()[0] &&
+ crt->head()[1] == crt->getNext()->tail()[1])
+ )
+ {
+ find = 1;
+ crt=crt->deleteChain(crt, crt->getNext());
+ }
+ else
+ {
+ //now we know crt and crt->getNext do not intersect
+ begin = crt;
+ end = crt->getNext();
+//printf("begin=(%f,%f)\n", begin->head()[0], begin->head()[1]);
+//printf("end=(%f,%f)\n", end->head()[0], end->head()[1]);
+ for(temp=end->getNext(); temp!=begin; temp= temp->getNext())
+ {
+//printf("temp=(%f,%f)\n", temp->head()[0], temp->head()[1]);
+ directedLine *intersect = DBG_edgeIntersectChainD(temp, begin, end);
+ if(intersect != NULL)
+ {
+ crt = crt->deleteChain(intersect, temp);
+ find=1;
+ break; //the for loop
+ }
+ else
+ {
+ end = temp;
+ }
+ }
+ }
+ if(find == 0)
+ return crt;
+ else
+ find = 0; //go to next loop
+}
+}
+
+directedLine* DBG_cutIntersectionAllPoly(directedLine* list)
+{
+ directedLine* temp;
+ directedLine* tempNext=NULL;
+ directedLine* ret = NULL;
+ int cutOccur=0;
+ for(temp=list; temp != NULL; temp = tempNext)
+ {
+ directedLine *left;
+ tempNext = temp->getNextPolygon();
+
+ left = DBG_cutIntersectionPoly(temp, cutOccur);
+ if(left != NULL)
+ ret=left->insertPolygon(ret);
+ }
+ return ret;
+}
+
+sampledLine* DBG_collectSampledLinesAllPoly(directedLine *polygonList)
+{
+ directedLine *temp;
+ sampledLine* tempHead = NULL;
+ sampledLine* tempTail = NULL;
+ sampledLine* cHead = NULL;
+ sampledLine* cTail = NULL;
+
+ if(polygonList == NULL)
+ return NULL;
+
+ DBG_collectSampledLinesPoly(polygonList, cHead, cTail);
+
+ assert(cHead);
+ assert(cTail);
+ for(temp = polygonList->getNextPolygon(); temp != NULL; temp = temp->getNextPolygon())
+ {
+ DBG_collectSampledLinesPoly(temp, tempHead, tempTail);
+ cTail->insert(tempHead);
+ cTail = tempTail;
+ }
+ return cHead;
+}
+
+void DBG_collectSampledLinesPoly(directedLine *polygon, sampledLine*& retHead, sampledLine*& retTail)
+{
+ directedLine *temp;
+ sampledLine *ret = NULL;
+ retHead = NULL;
+ retTail = NULL;
+ if(polygon == NULL)
+ return;
+
+ retHead = retTail = polygon->getSampledLine();
+ for(temp = polygon->getNext(); temp != polygon; temp=temp->getNext())
+ {
+ retHead = temp->getSampledLine()->insert(retHead);
+ }
+}
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