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#ifndef MINAREABOUNDINGBOX_HPP
#define MINAREABOUNDINGBOX_HPP
#include "libslic3r/Point.hpp"
namespace Slic3r {
class Polygon;
class ExPolygon;
void remove_collinear_points(Polygon& p);
void remove_collinear_points(ExPolygon& p);
/// A class that holds a rotated bounding box. If instantiated with a polygon
/// type it will hold the minimum area bounding box for the given polygon.
/// If the input polygon is convex, the complexity is linear to the number of
/// points. Otherwise a convex hull of O(n*log(n)) has to be performed.
class MinAreaBoundigBox {
Point m_axis;
long double m_bottom = 0.0l, m_right = 0.0l;
public:
// Polygons can be convex or simple (convex or concave with possible holes)
enum PolygonLevel {
pcConvex, pcSimple
};
// Constructors with various types of geometry data used in Slic3r.
// If the convexity is known apriory, pcConvex can be used to skip
// convex hull calculation. It is very important that the input polygons
// do NOT have any collinear points (except for the first and the last
// vertex being the same -- meaning a closed polygon for boost)
// To make sure this constraint is satisfied, you can call
// remove_collinear_points on the input polygon before handing over here)
explicit MinAreaBoundigBox(const Polygon&, PolygonLevel = pcSimple);
explicit MinAreaBoundigBox(const ExPolygon&, PolygonLevel = pcSimple);
explicit MinAreaBoundigBox(const Points&, PolygonLevel = pcSimple);
// Returns the angle in radians needed for the box to be aligned with the
// X axis. Rotate the polygon by this angle and it will be aligned.
double angle_to_X() const;
// The box width
long double width() const;
// The box height
long double height() const;
// The box area
long double area() const;
// The axis of the rotated box. If the angle_to_X is not sufficiently
// precise, use this unnormalized direction vector.
const Point& axis() const { return m_axis; }
};
}
#endif // MINAREABOUNDINGBOX_HPP
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