circle_shape.cpp

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#include "circle_shape.hpp"
 
using namespace generator;
 
circle_shape_t::circle_shape_t(double radius, int segments, double start, double sweep)
    : parametric_shape_{[radius, start, sweep](double t)
                        {
                            const double angle = t * sweep + start;
                            const double sine = std::sin(angle);
                            const double cosine = std::cos(angle);
 
                            shape_vertex_t vertex;
                            vertex.position = gml::dvec2{radius * cosine, radius * sine};
                            vertex.tangent = gml::dvec2{-sine, cosine};
                            vertex.tex_coord = t;
 
                            return vertex;
                        },
                        segments}
{
}