24 lines
973 B
C++
24 lines
973 B
C++
#ifndef slic3r_PrincipalComponents2D_hpp_
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#define slic3r_PrincipalComponents2D_hpp_
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#include "AABBTreeLines.hpp"
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#include "BoundingBox.hpp"
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#include "libslic3r.h"
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#include <vector>
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#include "Polygon.hpp"
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namespace Slic3r {
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// returns triangle area, first_moment_of_area_xy, second_moment_of_area_xy, second_moment_of_area_covariance
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// none of the values is divided/normalized by area.
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// The function computes intgeral over the area of the triangle, with function f(x,y) = x for first moments of area (y is analogous)
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// f(x,y) = x^2 for second moment of area
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// and f(x,y) = x*y for second moment of area covariance
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std::tuple<float, Vec2f, Vec2f, float> compute_moments_of_area_of_triangle(const Vec2f &a, const Vec2f &b, const Vec2f &c);
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// returns two eigenvectors of the area covered by given polygons. The vectors are sorted by their corresponding eigenvalue, largest first
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std::tuple<Vec2f, Vec2f> compute_principal_components(const Polygons &polys);
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}
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#endif |