Fwd: Integrate libQGLViewer

8 Apr 2013

      Dear all,

 I was frustrated last night, because I failed to integrate libQGLViewer
into OpenFlipper. It is just a very simple example.

 Any ideas? Or, If I want to show up a new window with
glutCreateWindow("demo");, where I can draw primitives using OpenGL. How
can I do that?

Thanks.

//**************** caller
SimpleViewer simplerviewerHelpme;

/*#if QT_VERSION < 0x040000
 // Set the viewer as the application main widget.
application.setMainWidget(&simplerviewer);
#else
 simplerviewer.setWindowTitle("simpleViewer");
#endif*/

// Make the viewer window visible on screen.
 //simplerviewerHelpme.

//***********************
#ifndef CS554PROJ2PLUGINSIMPLEVIWER_HH
#define CS554PROJ2PLUGINSIMPLEVIWER_HH

#include <QGLViewer/qglviewer.h>

class SimpleViewer : public QGLViewer
{
protected :
  virtual void draw();
  virtual void init();
  virtual QString helpString() const;
};

#endif

//*********************
#include "simpleViewer.h"

using namespace std;

// Draws a spiral
void SimpleViewer::draw()
{
  const float nbSteps = 200.0;

  glBegin(GL_QUAD_STRIP);
  for (int i=0; i<nbSteps; ++i)
    {
      const float ratio = i/nbSteps;
      const float angle = 21.0*ratio;
      const float c = cos(angle);
      const float s = sin(angle);
      const float r1 = 1.0 - 0.8f*ratio;
      const float r2 = 0.8f - 0.8f*ratio;
      const float alt = ratio - 0.5f;
      const float nor = 0.5f;
      const float up = sqrt(1.0-nor*nor);
      glColor3f(1.0-ratio, 0.2f , ratio);
      glNormal3f(nor*c, up, nor*s);
      glVertex3f(r1*c, alt, r1*s);
      glVertex3f(r2*c, alt+0.05f, r2*s);
    }
  glEnd();
}

void SimpleViewer::init()
{
  // Restore previous viewer state.
  restoreStateFromFile();

  // Opens help window
  help();
}

QString SimpleViewer::helpString() const
{
 QString text("<h2>S i m p l e V i e w e r</h2>");
 text += "Use the mouse to move the camera around the object. ";
 text += "You can respectively revolve around, zoom and translate with the
three mouse buttons. ";
 text += "Left and middle buttons pressed together rotate around the
camera view direction axis ";
 text += "Pressing Alt and one of the function keys
(F1..F12) defines a camera keyFrame. ";
 text += "Simply press the function key again to restore it. Several
keyFrames define a ";
 text += "camera path. Paths are saved when you quit the application and
restored at next start. ";
 text += "Press F to display the frame rate, A for the world
axis, ";
 text += "Alt+Return for full screen mode and Control+S to
save a snapshot. ";
 text += "See the Keyboard tab in this window for a complete
shortcut list. ";
 text += "Double clicks automates single click actions: A left button
double click aligns the closer axis with the camera (if close enough). ";
 text += "A middle button double click fits the zoom of the camera and the
right button re-centers the scene. ";
 text += "A left button double click while holding right button pressed
defines the camera Revolve Around Point. ";
 text += "See the Mouse tab and the documentation web pages for
details. ";
 text += "Press Escape to exit the viewer.";
 return text;
}

刘先勇

Jan Möbius

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