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Fixed Polygon::centroid()

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Ported Polygon unit tests from Perl to C++.
This commit is contained in:
Vojtech Bubnik 2021-05-07 11:42:01 +02:00
parent 48cc1e6e34
commit 52b3c655ff
4 changed files with 122 additions and 87 deletions
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22
src/libslic3r/Polygon.cpp
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@ -155,17 +155,19 @@ void Polygon::triangulate_convex(Polygons* polygons) const
// center of mass
Point Polygon::centroid() const
{
double area_temp = this->area();
double x_temp = 0;
double y_temp = 0;
Polyline polyline = this->split_at_first_point();
for (Points::const_iterator point = polyline.points.begin(); point != polyline.points.end() - 1; ++point) {
x_temp += (double)( point->x() + (point+1)->x() ) * ( (double)point->x()*(point+1)->y() - (double)(point+1)->x()*point->y() );
y_temp += (double)( point->y() + (point+1)->y() ) * ( (double)point->x()*(point+1)->y() - (double)(point+1)->x()*point->y() );
double area_sum = 0.;
Vec2d c(0., 0.);
if (points.size() >= 3) {
Vec2d p1 = points.back().cast<double>();
for (const Point &p : points) {
Vec2d p2 = p.cast<double>();
double a = cross2(p1, p2);
area_sum += a;
c += (p1 + p2) * a;
p1 = p2;
}
}
return Point(x_temp/(6*area_temp), y_temp/(6*area_temp));
return Point(Vec2d(c / (3. * area_sum)));
}
// find all concave vertices (i.e. having an internal angle greater than the supplied angle)