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Fixed calc_point_inside().

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Very small sliver contours were irritating the contour tree builder, so that contours ended up as children of nodes in which they were not contained.
This commit is contained in:
Ralf Gerlich 2008-02-08 12:13:01 +01:00
parent cd90019bbf
commit 74d80cdcd7
1 changed files with 62 additions and 35 deletions
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91
src/Lib/Geometry/poly_support.cxx
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@ -386,21 +386,15 @@ static void intersect_yline_with_contour( double yline, TGContourNode *node, TGP
const Point3D &p0 = pts[ i ];
const Point3D &p1 = pts[ ( i + 1 ) % count ];
double ymin=p0.y(),ymax=p0.y();
// cout << "intersect_yline_with_contour() i=" << i << " p0=(" << p0.x() << ", " << p0.y() << ") p1=(" << p1.x() << ", " << p1.y() << ") yline=" << yline << endl;
if (p1.y()<ymin)
ymin=p1.y();
if (ymax<p1.y())
ymax=p1.y();
double t=(yline-p0.y())/(p1.y()-p0.y());
// cout << "intersect_yline_with_contour() p0=(" << p0.x() << ", " << p0.y() << ") p1=(" << p1.x() << ", " << p1.y() << ") ymin=" << ymin << " ymax=" << ymax << " yline=" << yline << endl;
if (yline<ymin || ymax<yline) {
// cout << "intersect_yline_with_contour() does not intersect" << endl;
if (t<0.0 || 1.0<t) {
// cout << "intersect_yline_with_contour() does not intersect t=" << t << endl;
continue;
}
double t=(yline-p0.y())/(p1.y()-p0.y());
double x=p0.x()+t*(p1.x()-p0.x());
// cout << "intersect_yline_with_contour() intersection at x=" << x << endl;
@ -418,12 +412,39 @@ static void collect_contour_points( TGContourNode* node, TGPolygon &p, point_lis
pts.insert(pts.end(),contourpts.begin(),contourpts.end());
}
static void write_tree_element( TGContourNode *node, TGPolygon& p, int hole=0) {
int contour_num = node->get_contour_num();
char buf[256];
sprintf(buf, "failed/element%ld.poly",contour_num);
FILE *treefp = fopen(buf,"w");
fprintf(treefp,"#2D\n");
fprintf(treefp,"Airport\n");
fprintf(treefp,"1\n");
fprintf(treefp,"%ld\n",p.contour_size(contour_num));
fprintf(treefp,"%d\n",hole);
for (int i=0;i<p.contour_size(contour_num);i++) {
Point3D pt=p.get_pt(contour_num,i);
fprintf(treefp,"%.15f %.15f\n",pt.x(),pt.y());
}
fclose(treefp);
for ( int i = 0; i < node->get_num_kids(); ++i ) {
if ( node->get_kid( i ) != NULL ) {
write_tree_element( node->get_kid( i ), p, 1-hole);
}
}
}
// recurse the contour tree and build up the point inside list for
// each contour/hole
static void calc_point_inside( TGContourNode *node, TGPolygon &p ) {
int contour_num = node->get_contour_num();
// cout << "starting calc_point_inside() with contour = " << contour_num
// << endl;
// cout << "starting calc_point_inside() with contour = " << contour_num << endl;
for ( int i = 0; i < node->get_num_kids(); ++i ) {
if ( node->get_kid( i ) != NULL ) {
@ -463,8 +484,6 @@ static void calc_point_inside( TGContourNode *node, TGPolygon &p ) {
sort(allpoints.begin(), allpoints.end(), Point3DOrdering(PY));
// TODO: check bounding box size for whether polygon is empty
point_list::iterator point_it;
point_it=allpoints.begin();
@ -482,11 +501,15 @@ static void calc_point_inside( TGContourNode *node, TGPolygon &p ) {
lastpt=*point_it;
}
cout << "calc_point_inside() " << allpoints.size() << " points ";
copy(allpoints.begin(), allpoints.end(), ostream_iterator<Point3D>(cout, " "));
cout << endl;
// cout << "calc_point_inside() " << allpoints.size() << " points ";
// copy(allpoints.begin(), allpoints.end(), ostream_iterator<Point3D>(cout, " "));
// cout << endl;
cout << "calc_point_inside() maxdiff=" << maxdiff << " yline=" << yline << endl;
// cout << "calc_point_inside() maxdiff=" << maxdiff << " yline=" << yline << endl;
if (maxdiff < SG_EPSILON) {
throw sg_exception("Polygon is too small in y-direction");
}
vector < double > xcuts;
@ -500,9 +523,9 @@ static void calc_point_inside( TGContourNode *node, TGPolygon &p ) {
sort( xcuts.begin(), xcuts.end() );
cout << "calc_point_inside() " << xcuts.size() << " intersections ";
copy(xcuts.begin(), xcuts.end(), ostream_iterator<double>(cout, " "));
cout << endl;
// cout << "calc_point_inside() " << xcuts.size() << " intersections ";
// copy(xcuts.begin(), xcuts.end(), ostream_iterator<double>(cout, " "));
// cout << endl;
if ( xcuts.size() < 2 || (xcuts.size() % 2) != 0 ) {
throw sg_exception("Geometric inconsistency in calc_point_inside()");
@ -1018,19 +1041,23 @@ TGPolygon remove_bad_contours( const TGPolygon &poly ) {
//cout << "tossing a bad contour" << endl;
continue;
}
double xmin,xmax,ymin,ymax;
xmin=xmax=contour[0].x();
ymin=ymax=contour[0].y();
for ( int j = 1; j < contour.size(); ++j ) {
xmin = SGMisc<double>::min(xmin,contour[j].x());
ymin = SGMisc<double>::min(ymin,contour[j].y());
xmax = SGMisc<double>::max(xmax,contour[j].x());
ymax = SGMisc<double>::max(ymax,contour[j].y());
}
if ( xmax-xmin < SG_EPSILON || ymax-ymin < SG_EPSILON ) {
//cout << "tossing a bad contour (too small)" << endl;
point_list allpoints = contour;
sort(allpoints.begin(), allpoints.end(), Point3DOrdering(PY));
point_list::iterator point_it;
point_it=allpoints.begin();
Point3D lastpt=*point_it;
double area=poly.area_contour(i);
if (-SG_EPSILON<area && area<SG_EPSILON) {
// cout << "tossing a bad contour " << i << " (too small)" << endl;
continue;
}
/* keeping the contour */
int flag = poly.get_hole_flag( i );
result.add_contour( contour, flag );