GizmoSystem.hpp

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#pragma once
 
#include <glm/glm.hpp>
 
#include <ECS/Registry.hpp>
#include <ECS/RegistryViewer.hpp>
 
namespace shkyera {
 
class GizmoSystem : public RegistryViewer {
 public:
  GizmoSystem(std::shared_ptr<Registry> registry);
  ~GizmoSystem();
 
  void update();
 
 private:
  inline static const auto Red = glm::vec3{0.9, 0.1, 0.1};
  inline static const auto Green = glm::vec3{0.1, 0.9, 0.3};
  inline static const auto Blue = glm::vec3{0.1, 0.45, 0.95};
  inline static const auto Grey = glm::vec3{0.8, 0.8, 0.8};
 
  static constexpr float GizmoLineWidth = 0.02;
  static constexpr float GizmoLineLength = 1.0;
  static constexpr float GizmoHandleSize = 0.1;
  static constexpr float GizmoScale = 0.07;
 
  enum class Mode {
    TRANSLATION,
    SCALE,
  };
 
  void handleInput();
  void moveEntity();
  void scaleEntity();
 
  void selectEntity();
  void styleOnHover();
  void adjustGizmoTransform();
 
  bool isHoverMoved(std::optional<Entity> currentHover) const;
  glm::vec3 getSelectedHandleDisplacement() const;
  std::optional<glm::vec3> getMouseIntersectionWithHandle() const;
 
  // Global Info
  Mode _mode = Mode::TRANSLATION;
  std::shared_ptr<Registry> _registry;
  glm::vec3 _originalColor;
  std::optional<Entity> _selectedHandle;
  std::optional<Entity> _hoveredHandle;
  std::optional<Entity> _controlledEntity;
 
  // Translation Info
  Entity _translationGizmo;
  glm::vec3 _originalHandlePosition;
  glm::vec3 _originalDisplacement;
 
  // Scale Info
  Entity _scaleGizmo;
  Entity _scaleUniformHandle, _scaleGizmoLineX, _scaleGizmoLineY, _scaleGizmoLineZ;
  glm::vec3 _originalScale;
 
  // Rotatin Info
  Entity _rotationGizmo;
  glm::vec3 _originalPlaneIntersection;
  glm::vec3 _originalOrientation;
};
 
}  // namespace shkyera