DGG_SVG_VIS/Renderer/Renderer.cpp

#include "Renderer.h"
#include <memory>
#include <vtkActor.h>
#include <vtkAutoInit.h>
#include <vtkCallbackCommand.h>
#include <vtkCellPicker.h>
#include <vtkConeSource.h>
#include <vtkFloatArray.h>
#include <vtkInteractorStyleTrackballCamera.h>
#include <vtkLineSource.h>
#include <vtkLookupTable.h>
#include <vtkNew.h>
#include <vtkPointData.h>
#include <vtkPoints.h>
#include <vtkPolyLine.h>
#include <vtkPolyline.h>
#include <vtkProperty.h>
#include <vtkRenderer.h>
#include <vtkRendererCollection.h>
#include <vtkScalarBarActor.h>
#include <vtkSmartPointer.h>
#include <vtkTriangle.h>
#include <vtkVertexGlyphFilter.h>

VTK_MODULE_INIT(vtkRenderingOpenGL2);
VTK_MODULE_INIT(vtkInteractionStyle);
VTK_MODULE_INIT(vtkRenderingFreeType);

std::shared_ptr<Renderer> Renderer::_instance = nullptr;

Renderer::Renderer() {
  _vtkRenderer = vtkSmartPointer<vtkRenderer>::New();
  _vtkRenderer->SetUseFXAA(true);

  _renwin = vtkSmartPointer<vtkRenderWindow>::New();
  _renwin->AddRenderer(_vtkRenderer);
  _renwin->SetSize(800, 800);
  _renwin->SetWindowName("OCC Viewer");

  vtkNew<vtkInteractorStyleTrackballCamera> iStyle;
  _interactor = vtkSmartPointer<vtkRenderWindowInteractor>::New();
  _interactor->SetRenderWindow(_renwin);
  _interactor->SetInteractorStyle(iStyle);

  /***** Axes */
  // vtkNew<MyVTKCoordAxesActor> axes;
  // axes->setAxisLength(5, 5, 5);
  // axes->setConeRadius(0.1);
  // axes->setConeHeight(0.2);
  // _vtkRenderer->AddActor(axes);
}

void Renderer::addMesh(const DrawMeshDesc &desc) {
  if (!desc.model || !desc.model->m_fBeLoaded) {
    std::cerr << "Model not loaded!\n";
    return;
  }

  auto points = vtkSmartPointer<vtkPoints>::New();
  for (int i = 0; i < desc.model->GetNumOfVerts(); ++i) {
    const auto &v = desc.model->Vert(i);
    points->InsertNextPoint(v.x, v.y, v.z);
  }

  auto polys = vtkSmartPointer<vtkCellArray>::New();
  for (int i = 0; i < desc.model->GetNumOfFaces(); ++i) {
    const auto &f = desc.model->Face(i);
    auto triangle = vtkSmartPointer<vtkTriangle>::New();
    triangle->GetPointIds()->SetId(0, f[0]);
    triangle->GetPointIds()->SetId(1, f[1]);
    triangle->GetPointIds()->SetId(2, f[2]);
    polys->InsertNextCell(triangle);
  }

  auto polyData = vtkSmartPointer<vtkPolyData>::New();
  polyData->SetPoints(points);
  polyData->SetPolys(polys);

  // 如果有顶点法向量
  if (!desc.model->m_NormalsToVerts.empty()) {
    auto normals = vtkSmartPointer<vtkFloatArray>::New();
    normals->SetNumberOfComponents(3);
    normals->SetName("Normals");
    for (const auto &n : desc.model->m_NormalsToVerts) {
      float arr[3] = {static_cast<float>(n.x), static_cast<float>(n.y),
                      static_cast<float>(n.z)};
      normals->InsertNextTuple(arr);
    }
    polyData->GetPointData()->SetNormals(normals);
  }

  auto mapper = vtkSmartPointer<vtkPolyDataMapper>::New();
  mapper->SetInputData(polyData);

  auto actor = vtkSmartPointer<vtkActor>::New();
  actor->SetMapper(mapper);
  actor->GetProperty()->SetColor(desc.color.r, desc.color.g, desc.color.b);
  actor->GetProperty()->SetOpacity(desc.opacity);

  _vtkRenderer->AddActor(actor);
}

void Renderer::addPolyline(const DrawPolylineDesc &desc) {
  if (desc.points.empty()) {
    std::cerr << "Polyline has no points!\n";
    return;
  }

  auto points = vtkSmartPointer<vtkPoints>::New();
  for (const auto &p : desc.points) {
    points->InsertNextPoint(p.x, p.y, p.z);
  }

  auto cells = vtkSmartPointer<vtkCellArray>::New();

  // 主 polyline
  auto polyLine = vtkSmartPointer<vtkPolyLine>::New();
  polyLine->GetPointIds()->SetNumberOfIds(
      static_cast<vtkIdType>(desc.points.size()));
  for (vtkIdType i = 0; i < static_cast<vtkIdType>(desc.points.size()); ++i) {
    polyLine->GetPointIds()->SetId(i, i);
  }
  cells->InsertNextCell(polyLine);

  // 如果需要闭合，额外加一条段：最后一个点 -> 第一个点
  if (desc.closed && desc.points.size() > 2) {
    vtkIdType lastId = static_cast<vtkIdType>(desc.points.size() - 1);
    vtkIdType firstId = 0;

    vtkIdType linePts[2] = {lastId, firstId};
    cells->InsertNextCell(2, linePts);
  }

  auto polyData = vtkSmartPointer<vtkPolyData>::New();
  polyData->SetPoints(points);
  polyData->SetLines(cells);

  auto mapper = vtkSmartPointer<vtkPolyDataMapper>::New();
  mapper->SetInputData(polyData);

  auto actor = vtkSmartPointer<vtkActor>::New();
  actor->SetMapper(mapper);
  actor->GetProperty()->SetColor(desc.color.r, desc.color.g, desc.color.b);
  actor->GetProperty()->SetLineWidth(desc.width);

  _vtkRenderer->AddActor(actor);
}

void Renderer::addPointCloud(const DrawPointCloudDesc &desc) {
    auto points = vtkSmartPointer<vtkPoints>::New();
    auto vertices = vtkSmartPointer<vtkCellArray>::New();

    for (size_t i = 0; i < desc.points.size(); ++i) {
        const auto &p = desc.points[i];
        vtkIdType pid = points->InsertNextPoint(p.x, p.y, p.z);
        vertices->InsertNextCell(1);
        vertices->InsertCellPoint(pid);
    }

    auto polyData = vtkSmartPointer<vtkPolyData>::New();
    polyData->SetPoints(points);
    polyData->SetVerts(vertices);

    // 用GlyphFilter确保显示每个点
    auto glyphFilter = vtkSmartPointer<vtkVertexGlyphFilter>::New();
    glyphFilter->SetInputData(polyData);
    glyphFilter->Update();

    auto mapper = vtkSmartPointer<vtkPolyDataMapper>::New();
    mapper->SetInputConnection(glyphFilter->GetOutputPort());

    auto actor = vtkSmartPointer<vtkActor>::New();
    actor->SetMapper(mapper);

    actor->GetProperty()->SetColor(desc.color.r, desc.color.g, desc.color.b);

    actor->GetProperty()->SetPointSize(desc.pointSize);

    _vtkRenderer->AddActor(actor);
}