turntable.hpp

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// SPDX-FileCopyrightText: 2025 Povl Filip Sonne-Frederiksen
//
// SPDX-License-Identifier: GPL-3.0-or-later
 
#pragma once
 
#include <array>
#include <chrono>
#include <cmath>
#include <memory>
#include <numbers>
 
// Forward-declare to avoid pulling PCL/VTK into the math-only header.
namespace rux {
class VizualizationObserver;
} // namespace rux
 
namespace rux::view {

struct TurntableState {
  bool active = false;           
  bool spinning = true;          
  bool tick_running = false;     
  double azimuth = 0.0;          
  double angular_velocity = 0.3; 
  double radius = 5.0;           
  double elevation_deg = 20.0;   
  std::array<double, 3> center = {0.0, 0.0, 0.0}; 
  std::chrono::steady_clock::time_point last_tick{};
};

[[nodiscard]] inline std::array<double, 3>
orbit_camera_position(const std::array<double, 3> &center, double radius,
                      double azimuth_rad, double elevation_deg) noexcept {
  const double el = elevation_deg * (std::numbers::pi / 180.0);
  return {center[0] + radius * std::cos(azimuth_rad) * std::cos(el),
          center[1] + radius * std::sin(azimuth_rad) * std::cos(el),
          center[2] + radius * std::sin(el)};
}

void register_turntable_callbacks(std::shared_ptr<TurntableState> state,
                                  rux::VizualizationObserver &observer);
 
} // namespace rux::view