sphere2.h

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// Copyright (c) 2018 Doyub Kim
//
// I am making my contributions/submissions to this project solely in my
// personal capacity and am not conveying any rights to any intellectual
// property of any third parties.
 
#ifndef INCLUDE_JET_SPHERE2_H_
#define INCLUDE_JET_SPHERE2_H_
 
#include <jet/surface2.h>
#include <jet/bounding_box2.h>
 
namespace jet {
 
class Sphere2 final : public Surface2 {
 public:
    class Builder;
 
    Vector2D center;
 
    double radius = 1.0;
 
    Sphere2(
        const Transform2& transform = Transform2(),
        bool isNormalFlipped = false);
 
    Sphere2(
        const Vector2D& center,
        double radius,
        const Transform2& transform = Transform2(),
        bool isNormalFlipped = false);
 
    Sphere2(const Sphere2& other);
 
    static Builder builder();
 
 private:
    Vector2D closestPointLocal(const Vector2D& otherPoint) const override;
 
    double closestDistanceLocal(const Vector2D& otherPoint) const override;
 
    bool intersectsLocal(const Ray2D& ray) const override;
 
    BoundingBox2D boundingBoxLocal() const override;
 
    Vector2D closestNormalLocal(const Vector2D& otherPoint) const override;
 
    SurfaceRayIntersection2 closestIntersectionLocal(
        const Ray2D& ray) const override;
};
 
typedef std::shared_ptr<Sphere2> Sphere2Ptr;
 
 
class Sphere2::Builder final : public SurfaceBuilderBase2<Sphere2::Builder> {
 public:
    Builder& withCenter(const Vector2D& center);
 
    Builder& withRadius(double radius);
 
    Sphere2 build() const;
 
    Sphere2Ptr makeShared() const;
 
 private:
    Vector2D _center{0, 0};
    double _radius = 0.0;
};
 
}  // namespace jet
 
 
#endif  // INCLUDE_JET_SPHERE2_H_