X3DViewer

Introduction

This is the minimum code example. We use the class X3DTK::SimpleX3DGLScene to load and draw an X3D scene. X3DTK::SimpleX3DGLScene encapsulates basic operations: loading an X3D file into an X3D scene graph, computing the bounding box of the scene and drawing the content of the scene. We define a Viewer class that inherits the QGLViewer class and has X3DTK::SimpleX3DGLScene as a member attribute. QGLViewer provides an efficient and intuitive mouse trackball.

Some important functions and classes:

• X3DTK::SimpleX3DGLScene
• X3DTK::BBox

Code

Viewer.h

#ifndef VIEWER_H
#define VIEWER_H

#include <QGLViewer/qglviewer.h>
#include <X3DTK/simplex3dglscene.h>

// Class providing an X3D Viewer by using X3DTK::SimpleX3DGLScene 

class Viewer : public QGLViewer
{
protected :
  void init();
  void draw();
  void keyPressEvent(QKeyEvent *e);
  void loadFile();
  void about();
  QString helpString() const;
  void help() const;
  
private:
  X3DTK::SimpleX3DGLScene scene;
};

#endif

Viewer.cpp

#include "Viewer.h"
#include <qfiledialog.h>
#include <qmessagebox.h> 
#include <X3DTK/kernel.h>

using namespace X3DTK;
using namespace std;

void Viewer::init()
{
#ifdef GL_RESCALE_NORMAL
  glEnable(GL_RESCALE_NORMAL);
#endif
  about();
  loadFile();
}

void Viewer::keyPressEvent(QKeyEvent *e)
{
  switch (e->key())
  {
    case Qt::Key_L : loadFile(); break;
    default:         QGLViewer::keyPressEvent(e);
  }
}

void Viewer::loadFile()
{
  QString name = QFileDialog::getOpenFileName("", "X3D files (*.x3d *.X3D);;All files (*)", this);
  
  // In case of Cancel
  if (name.isEmpty())
    return;

  // Loads the file name
  scene.load(name);
  
  // QGLViewer settings
  setSceneBoundingBox(scene.getBBoxMin().f_data(), scene.getBBoxMax().f_data());
  showEntireScene();
}

void Viewer::draw()
{
  // Draws the scene.
  scene.draw();
}

void Viewer::about()
{
  QMessageBox::about(this, "about the X3DViewer", "this is an example showing how to load and display a simple X3D scene.Type 'h' to display help");
}

QString Viewer::helpString() const
{
  QString message("");
  
  message += "<b>L</b>" + QString(" loads a new file<br>");
  
  message += QGLViewer::helpString();
  
  return message;
}

void Viewer::help() const
{
  QMessageBox *mb = new QMessageBox("help", helpString(), QMessageBox::NoIcon,QMessageBox::Ok | QMessageBox::Default, QMessageBox::NoButton,QMessageBox::NoButton, NULL, "Help", false,Qt::WStyle_DialogBorder | Qt::WType_Dialog | Qt::WDestructiveClose);
  mb->show();
}

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