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Ported concave_points() and convex_points() to XS

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This commit is contained in:
Alessandro Ranellucci 2014-11-30 21:48:50 +01:00
parent 076d82d8d6
commit 1fda9e3d50
4 changed files with 62 additions and 47 deletions
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54
xs/src/libslic3r/Polygon.cpp
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@ -222,6 +222,60 @@ Polygon::wkt() const
return wkt.str();
}
void
Polygon::concave_points(double angle, Points* points) const
{
/* input angle threshold is checked on the internal side of the polygon
but ccw() returns 0 for collinear, >0 for ccw and <0 for cw */
double ccw_angle = angle - PI;
// check whether first point forms a concave angle
if (this->points.front().ccw(this->points.back(), *(this->points.begin()+1)) >= ccw_angle)
points->push_back(this->points.front());
// check whether points 1..(n-1) form concave angles
for (Points::const_iterator p = this->points.begin()+1; p != this->points.end()-1; ++p) {
if (p->ccw(*(p-1), *(p+1)) >= ccw_angle) points->push_back(*p);
}
// check whether last point forms a concave angle
if (this->points.back().ccw(*(this->points.end()-2), this->points.front()) >= ccw_angle)
points->push_back(this->points.back());
}
void
Polygon::concave_points(Points* points) const
{
this->concave_points(PI, points);
}
void
Polygon::convex_points(double angle, Points* points) const
{
/* input angle threshold is checked on the internal side of the polygon
but ccw() returns 0 for collinear, >0 for ccw and <0 for cw */
double ccw_angle = angle - PI;
// check whether first point forms a convex angle
if (this->points.front().ccw(this->points.back(), *(this->points.begin()+1)) <= ccw_angle)
points->push_back(this->points.front());
// check whether points 1..(n-1) form convex angles
for (Points::const_iterator p = this->points.begin()+1; p != this->points.end()-1; ++p) {
if (p->ccw(*(p-1), *(p+1)) <= ccw_angle) points->push_back(*p);
}
// check whether last point forms a convex angle
if (this->points.back().ccw(*(this->points.end()-2), this->points.front()) <= ccw_angle)
points->push_back(this->points.back());
}
void
Polygon::convex_points(Points* points) const
{
this->convex_points(PI, points);
}
#ifdef SLIC3RXS
REGISTER_CLASS(Polygon, "Polygon");