camera.hpp

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#pragma once

 
#include "orrery/core/types.hpp"
#include "orrery/core/vec3.hpp"
#include "orrery/viz/matrix4.hpp"
 
namespace orrery::viz {

class OrbitCamera {
public:
    static constexpr core::Real kMaximumElevation = static_cast<core::Real>(1.5607963);

    core::Vec3 target;

    core::Real distance = 30;

    core::Real azimuth = 0;

    core::Real elevation = static_cast<core::Real>(0.3);

    core::Real field_of_view = static_cast<core::Real>(0.6981317);

    core::Real near_fraction = static_cast<core::Real>(0.01);
    core::Real far_fraction = 10;

    [[nodiscard]] core::Vec3 eye() const noexcept;
 
    [[nodiscard]] Mat4 view() const noexcept;
 
    [[nodiscard]] Mat4 projection(core::Real aspect_ratio) const noexcept;

    [[nodiscard]] Mat4 view_projection(core::Real aspect_ratio) const noexcept;

    void orbit(core::Real delta_azimuth, core::Real delta_elevation) noexcept;

    void zoom(core::Real factor) noexcept;

    void pan(core::Real right, core::Real up) noexcept;
};
 
} // namespace orrery::viz