BSpline.cpp

Describe a curve thanks to a BSpline.

/****************************************************************************
 *
 * $Id: BSpline.cpp 4658 2014-02-09 09:50:14Z fspindle $
 *
 * This file is part of the ViSP software.
 * Copyright (C) 2005 - 2014 by INRIA. All rights reserved.
 * 
 * This software is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * ("GPL") version 2 as published by the Free Software Foundation.
 * See the file LICENSE.txt at the root directory of this source
 * distribution for additional information about the GNU GPL.
 *
 * For using ViSP with software that can not be combined with the GNU
 * GPL, please contact INRIA about acquiring a ViSP Professional 
 * Edition License.
 *
 * See http://www.irisa.fr/lagadic/visp/visp.html for more information.
 * 
 * This software was developed at:
 * INRIA Rennes - Bretagne Atlantique
 * Campus Universitaire de Beaulieu
 * 35042 Rennes Cedex
 * France
 * http://www.irisa.fr/lagadic
 *
 * If you have questions regarding the use of this file, please contact
 * INRIA at visp@inria.fr
 * 
 * This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
 * WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 *
 *
 * Description:
 * Exemple of a B-Spline curve.
 *
 * Authors:
 * Nicolas Melchior
 *
 *****************************************************************************/
#include <visp/vpDebug.h>

#include <visp/vpBSpline.h>

#include <visp/vpImage.h>
#include <visp/vpImageIo.h>
#include <visp/vpImagePoint.h>
#include <visp/vpDisplayGTK.h>
#include <visp/vpDisplayGDI.h>
#include <visp/vpDisplayOpenCV.h>
#include <visp/vpDisplayD3D.h>
#include <visp/vpDisplayX.h> // Should be after #include <visp/vpDisplayOpenCV.h>

#include <visp/vpParseArgv.h>
#include <visp/vpIoTools.h>
#include <cstdlib>
#include <stdlib.h>

#if defined(VISP_HAVE_X11) || defined(VISP_HAVE_GTK) || defined(VISP_HAVE_GDI) || defined(VISP_HAVE_OPENCV) || defined(VISP_HAVE_D3D9)

// List of allowed command line options
#define GETOPTARGS  "cdh"

void usage(const char *name, const char *badparam);
bool getOptions(int argc, const char **argv, bool &click_allowed, bool &display);

void usage(const char *name, const char *badparam)
{
  fprintf(stdout, "\n\
Describe a curve thanks to a BSpline.\n\
\n\
SYNOPSIS\n\
  %s [-c] [-d] [-h]\n", name);

  fprintf(stdout, "\n\
OPTIONS:                                               Default\n\
  -c\n\
     Disable the mouse click. Useful to automaze the \n\
     execution of this program without humain intervention.\n\
\n\
  -d \n\
     Turn off the display.\n\
\n\
  -h\n\
     Print the help.\n");

  if (badparam)
    fprintf(stdout, "\nERROR: Bad parameter [%s]\n", badparam);
}


bool getOptions(int argc, const char **argv, bool &click_allowed, bool &display)
{
  const char *optarg_;
  int   c;
  while ((c = vpParseArgv::parse(argc, argv, GETOPTARGS, &optarg_)) > 1) {

    switch (c) {
    case 'c': click_allowed = false; break;
    case 'd': display = false; break;
    case 'h': usage(argv[0], NULL); return false; break;

    default:
      usage(argv[0], optarg_);
      return false; break;
    }
  }

  if ((c == 1) || (c == -1)) {
    // standalone param or error
    usage(argv[0], NULL);
    std::cerr << "ERROR: " << std::endl;
    std::cerr << "  Bad argument " << optarg_ << std::endl << std::endl;
    return false;
  }

  return true;
}


int
main(int argc, const char ** argv)
{
  try {
    bool opt_click_allowed = true;
    bool opt_display = true;

    // Read the command line options
    if (getOptions(argc, argv, opt_click_allowed,
                   opt_display) == false) {
      exit (-1);
    }

    // Declare an image, this is a gray level image (unsigned char)
    // it size is not defined yet, it will be defined when the image will
    // read on the disk
    vpImage<unsigned char> I(540,480);

    // We open a window using either X11, GTK or GDI.
#if defined VISP_HAVE_X11
    vpDisplayX display;
#elif defined VISP_HAVE_GTK
    vpDisplayGTK display;
#elif defined VISP_HAVE_GDI
    vpDisplayGDI display;
#elif defined VISP_HAVE_OPENCV
    vpDisplayOpenCV display;
#elif defined VISP_HAVE_D3D9
    vpDisplayD3D display;
#endif

    if (opt_display) {
      // Display size is automatically defined by the image (I) size
      display.init(I, 100, 100,"Display image") ;
      vpDisplay::display(I) ;
      vpDisplay::flush(I) ;
    }

    vpBSpline bSpline;
    std::list<double> knots;
    knots.push_back(0);
    knots.push_back(0);
    knots.push_back(0);
    knots.push_back(1);
    knots.push_back(2);
    knots.push_back(3);
    knots.push_back(4);
    knots.push_back(4);
    knots.push_back(5);
    knots.push_back(5);
    knots.push_back(5);

    std::list<vpImagePoint> controlPoints;
    vpImagePoint pt;
    pt.set_ij(50,300);
    controlPoints.push_back(pt);
    pt.set_ij(100,130);
    controlPoints.push_back(pt);
    pt.set_ij(150,400);
    controlPoints.push_back(pt);
    pt.set_ij(200,370);
    controlPoints.push_back(pt);
    pt.set_ij(250,120);
    controlPoints.push_back(pt);
    pt.set_ij(300,250);
    controlPoints.push_back(pt);
    pt.set_ij(350,200);
    controlPoints.push_back(pt);
    pt.set_ij(400,300);
    controlPoints.push_back(pt);

    bSpline.set_p(2);
    bSpline.set_knots(knots);
    bSpline.set_controlPoints(controlPoints);

    std::cout << "The parameters are :" <<std::endl;
    std::cout << "p : " << bSpline.get_p() <<std::endl;
    std::cout << "" <<std::endl;
    std::cout << "The knot vector :" <<std::endl;
    std::list<double> knots_cur;
    bSpline.get_knots(knots_cur);
    unsigned int i_display=0;
    for(std::list<double>::const_iterator it=knots_cur.begin(); it!=knots_cur.end(); ++it, ++i_display){
      std::cout << i_display << " ---> " << *it << std::endl;
    }
    std::cout << "The control points are :" <<std::endl;
    std::list<vpImagePoint> controlPoints_cur;
    bSpline.get_controlPoints(controlPoints_cur);
    i_display=0;
    for(std::list<vpImagePoint>::const_iterator it=controlPoints_cur.begin(); it!=controlPoints_cur.end(); ++it, ++i_display){
      std::cout << i_display << " ---> " << *it << std::endl;
    }

    unsigned int i = bSpline.findSpan(5/2.0);
    std::cout << "The knot interval number for the value u = 5/2 is : " << i <<std::endl;

    vpBasisFunction *N = NULL;
    N = bSpline.computeBasisFuns(5/2.0);
    std::cout << "The nonvanishing basis functions N(u=5/2) are :" << std::endl;
    for (unsigned int j = 0; j < bSpline.get_p()+1; j++)
      std::cout << N[j].value << std::endl;

    vpBasisFunction **N2 = NULL;
    N2 = bSpline.computeDersBasisFuns(5/2.0, 2);
    std::cout << "The first derivatives of the basis functions N'(u=5/2) are :" << std::endl;
    for (unsigned int j = 0; j < bSpline.get_p()+1; j++)
      std::cout << N2[1][j].value << std::endl;

    std::cout << "The second derivatives of the basis functions N''(u=5/2) are :" << std::endl;
    for (unsigned int j = 0; j < bSpline.get_p()+1; j++)
      std::cout << N2[2][j].value << std::endl;

    if (opt_display && opt_click_allowed)
    {
      double u = 0.0;
      while (u <= 5)
      {
        pt = bSpline.computeCurvePoint(u);
        vpDisplay::displayCross(I,pt,4,vpColor::red);
        u+=0.01;
      }
      for(std::list<vpImagePoint>::const_iterator it=controlPoints.begin(); it!= controlPoints.end(); ++it){
        vpDisplay::displayCross(I, *it, 4, vpColor::green);
      }
      vpDisplay::flush(I) ;
      vpDisplay::getClick(I);
    }

    if (N != NULL) delete[] N;
    if (N2 != NULL)
    {
      for (unsigned int j = 0; j <= 2; j++)
        delete[] N2[j];
      delete[] N2;
    }

    return 0;
  }
  catch(vpException e) {
    std::cout << "Catch an exception: " << e << std::endl;
    return 1;
  }
}

#else
int main()
{
  std::cout << "This example requires a video device. " 
            << std::endl
            << "You should install X11, GTK, OpenCV, GDI or Direct3D"
            << std::endl
            << "to be able to execute this example."
            << std::endl;
  return 0;
}
#endif