DGG_SVG_VIS/Renderer/Renderer.h

#pragma once
#include <vtkPolyDataMapper.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include "ICH/BaseModel.h"
#include "ICH/Point3D.h"

struct Color {
  float r, g, b;
};

constexpr Color RED{1.0f, 0.0f, 0.0f};
constexpr Color GREEN{0.0f, 1.0f, 0.0f};
constexpr Color BLUE{0.0f, 0.0f, 1.0f};
constexpr Color WHITE{1.0f, 1.0f, 1.0f};
constexpr Color BLACK{0.0f, 0.0f, 0.0f};
constexpr Color YELLOW{1.0f, 1.0f, 0.0f};

struct DrawMeshDesc {
  const CBaseModel* model = nullptr;
  Color color;
  float opacity = 1.0f;
};

struct DrawPolylineDesc {
  std::vector<CPoint3D> points;
  Color color;
  float width;
  bool closed;
};

struct DrawPointCloudDesc {
  std::vector<CPoint3D> points;
  Color color;
  float pointSize;
};

class Renderer final {
public:
  static Renderer &getInstance() {
    if (!_instance) {
      _instance.reset(new Renderer());
    }
    return *_instance;
  }
  
  void render() {
    _renwin->Render();
    _interactor->Start();
  }

  void update() { _renwin->Render(); }

  void addMesh(const DrawMeshDesc &desc);

  void addPolyline(const DrawPolylineDesc &desc);

  void addPointCloud(const DrawPointCloudDesc &desc);

private:
  static std::shared_ptr<Renderer> _instance;
  vtkSmartPointer<vtkRenderWindow> _renwin;
  vtkSmartPointer<vtkRenderer> _vtkRenderer;
  vtkSmartPointer<vtkRenderWindowInteractor> _interactor;
  Renderer();
};