vpFeatureDisplay.cpp

/****************************************************************************
 *
 * This file is part of the ViSP software.
 * Copyright (C) 2005 - 2017 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://visp.inria.fr for more information.
 *
 * This software was developed at:
 * Inria Rennes - Bretagne Atlantique
 * Campus Universitaire de Beaulieu
 * 35042 Rennes Cedex
 * France
 *
 * 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:
 * Interface with the image for feature display.
 *
 * Authors:
 * Eric Marchand
 * Fabien Spindler
 *
 *****************************************************************************/

#include <visp3/core/vpFeatureDisplay.h>

// Meter/pixel conversion
#include <visp3/core/vpMeterPixelConversion.h>

// display
#include <visp3/core/vpDisplay.h>

// Debug trace
#include <visp3/core/vpDebug.h>

// math
#include <visp3/core/vpMath.h>

#include <visp3/core/vpImagePoint.h>



void vpFeatureDisplay::displayPoint(double x,double y,
                                    const vpCameraParameters &cam,
                                    const vpImage<unsigned char> &I,
                                    const vpColor &color,
                                    unsigned int thickness)
{
  try{
    vpImagePoint ip; // pixel coordinates in float
    vpMeterPixelConversion::convertPoint(cam, x, y, ip) ;

    vpDisplay::displayCross(I, ip, 15, color, thickness) ;
  }
  catch(...)
  {
    vpERROR_TRACE("Error caught") ;
    throw ;
  }

}
void vpFeatureDisplay::displayLine(double rho,double theta,
                                   const vpCameraParameters &cam,
                                   const vpImage<unsigned char> &I,
                                   const vpColor &color,
                                   unsigned int thickness )
{


  try{
    //    x cos(theta) + y sin(theta) - rho = 0

    double rhop,thetap ;
    vpMeterPixelConversion::convertLine(cam,rho,theta,rhop,thetap) ;

    //    u cos(thetap) + v sin(thetap) - rhop = 0

    double co = cos(thetap) ;
    double si = sin(thetap) ;
    double c = -rhop ;

    // vpTRACE("rhop %f %f ",rhop, atan2(si,co)) ;
    // double u1,v1,u2,v2 ;

    double a = si ;
    double b = co ;
    vpImagePoint ip1, ip2;

    if (fabs(a) < fabs(b)) {
      ip1.set_ij(0, (-c)/b);
      double h = I.getHeight() - 1;
      ip2.set_ij(h, (-c - a*h)/b);
      vpDisplay::displayLine(I, ip1, ip2, color, thickness);
    }
    else {
      ip1.set_ij((-c)/a, 0);
      double w = I.getWidth()-1;
      ip2.set_ij((-c - b*w)/a, w);
      vpDisplay::displayLine(I, ip1, ip2, color, thickness);
    }
  }
  catch(...)
  {
    vpERROR_TRACE("Error caught") ;
    throw ;
  }
}
void vpFeatureDisplay::displayCylinder(double rho1,double theta1,
                                       double rho2,double theta2,
                                       const vpCameraParameters &cam,
                                       const vpImage<unsigned char> &I,
                                       const vpColor &color,
                                       unsigned int thickness)
{
  try
  {
    displayLine(rho1, theta1, cam, I, color, thickness) ;
    displayLine(rho2, theta2, cam, I, color, thickness) ;
  }
  catch(...)
  {
    vpERROR_TRACE("Error caught") ;
    throw ;
  }
}
void vpFeatureDisplay::displayEllipse(double x,double y,
                                      double mu20, double mu11, double mu02,
                                      const vpCameraParameters &cam,
                                      const vpImage<unsigned char> &I,
                                      const vpColor &color,
                                      unsigned int thickness)
{
  try {
    unsigned int number_of_points = 45 ;
    const double incr = 2 * M_PI/(double)number_of_points ; // angle increment
    unsigned int i = 0 ;

    double s = sqrt(vpMath::sqr(mu20-mu02)+4*mu11*mu11) ;
    double a, b, e ;

    //if (fabs(mu11)<1e-6) e =0 ;
    if (fabs(mu11) < std::numeric_limits<double>::epsilon()) {
      e = 0 ;
      a = sqrt(mu20);
      b = sqrt(mu02);
    }
    else {
      e = (mu02-mu20+s)/(2*mu11) ;
      a = sqrt( (mu02+mu20+s)/2.0) ;
      b = sqrt( (mu02+mu20-s)/2.0) ;
    }

    double e1  = atan(e) ;

    double k = 0.0 ;

    double ce = cos(e1) ;
    double se = sin(e1) ;

    double x2  = 0;
    double y2 =0;
    vpImagePoint ip1, ip2;

    for( i = 0; i < number_of_points+2 ; i++)
    {
      double    x1 = a *cos(k) ; // equation of an ellipse
      double    y1 = b *sin(k) ; // equation of an ellipse
      double    x11 = x + ce *x1 - se *y1 ;
      double    y11 = y + se *x1 + ce *y1 ;

      vpMeterPixelConversion::convertPoint(cam, x11, y11, ip1);

      if (i > 1) {
        ip2.set_u( x2 );
        ip2.set_v( y2 );

        vpDisplay::displayLine(I, ip1, ip2, color, thickness) ;
      }

      ip2 = ip1;
      y2 = y1 ;
      x2 = x1 ;
      k += incr ;
    } // end for loop
  }
  catch(vpException &e)
  {
    throw(e);
  }
}

void vpFeatureDisplay::displayPoint(double x,double y,
                                    const vpCameraParameters &cam,
                                    const vpImage<vpRGBa> &I,
                                    const vpColor &color,
                                    unsigned int thickness)
{
  try{
    vpImagePoint ip; // pixel coordinates in float
    vpMeterPixelConversion::convertPoint(cam, x, y, ip) ;

    vpDisplay::displayCross(I, ip, 15, color, thickness) ;
  }
  catch(...)
  {
    vpERROR_TRACE("Error caught") ;
    throw ;
  }

}

void vpFeatureDisplay::displayLine(double rho,double theta,
                                   const vpCameraParameters &cam,
                                   const vpImage<vpRGBa> &I,
                                   const vpColor &color,
                                   unsigned int thickness )
{


  try{
    //    x cos(theta) + y sin(theta) - rho = 0

    double rhop,thetap ;
    vpMeterPixelConversion::convertLine(cam,rho,theta,rhop,thetap) ;

    //    u cos(thetap) + v sin(thetap) - rhop = 0

    double co = cos(thetap) ;
    double si = sin(thetap) ;
    double c = -rhop ;

    // vpTRACE("rhop %f %f ",rhop, atan2(si,co)) ;
    // double u1,v1,u2,v2 ;

    double a = si ;
    double b = co ;
    vpImagePoint ip1, ip2;

    if (fabs(a) < fabs(b)) {
      ip1.set_ij(0, (-c)/b);
      double h = I.getHeight() - 1;
      ip2.set_ij(h, (-c - a*h)/b);
      vpDisplay::displayLine(I, ip1, ip2, color, thickness);
    }
    else {
      ip1.set_ij((-c)/a, 0);
      double w = I.getWidth()-1;
      ip2.set_ij((-c - b*w)/a, w);
      vpDisplay::displayLine(I, ip1, ip2, color, thickness);
    }
  }
  catch(...)
  {
    vpERROR_TRACE("Error caught") ;
    throw ;
  }
}
void vpFeatureDisplay::displayCylinder(double rho1, double theta1,
                                       double rho2, double theta2,
                                       const vpCameraParameters &cam,
                                       const vpImage<vpRGBa> &I,
                                       const vpColor &color,
                                       unsigned int thickness)
{
  try
  {
    displayLine(rho1, theta1, cam, I, color, thickness) ;
    displayLine(rho2, theta2, cam, I, color, thickness) ;
  }
  catch(...)
  {
    vpERROR_TRACE("Error caught") ;
    throw ;
  }
}

void vpFeatureDisplay::displayEllipse(double x, double y,
                                      double mu20, double mu11, double mu02,
                                      const vpCameraParameters &cam,
                                      const vpImage<vpRGBa> &I,
                                      const vpColor &color,
                                      unsigned int thickness)
{
  try {
    unsigned int number_of_points = 45 ;
    const double incr = 2 * M_PI/(double)number_of_points ; // angle increment
    unsigned int i = 0 ;

    double s = sqrt(vpMath::sqr(mu20-mu02)+4*mu11*mu11) ;
    double a, b, e ;

    //if (fabs(mu11)<1e-6) e =0 ;
    if (fabs(mu11) < std::numeric_limits<double>::epsilon()) {
      e = 0 ;
      a = sqrt(mu20);
      b = sqrt(mu02);
    }
    else {
      e = (mu02-mu20+s)/(2*mu11) ;
      a = sqrt( (mu02+mu20+s)/2.0) ;
      b = sqrt( (mu02+mu20-s)/2.0) ;
    }

    double e1  = atan(e) ;

    double k = 0.0 ;

    double ce = cos(e1) ;
    double se = sin(e1) ;

    double x2  = 0;
    double y2 =0;
    vpImagePoint ip1, ip2;

    for( i = 0; i < number_of_points+2 ; i++)
    {
      double    x1 = a *cos(k) ; // equation of an ellipse
      double    y1 = b *sin(k) ; // equation of an ellipse
      double    x11 = x + ce *x1 - se *y1 ;
      double    y11 = y + se *x1 + ce *y1 ;

      vpMeterPixelConversion::convertPoint(cam, x11, y11, ip1);

      if (i > 1) {
        ip2.set_u( x2 );
        ip2.set_v( y2 );

        vpDisplay::displayLine(I, ip1, ip2, color, thickness) ;
      }

      ip2 = ip1;
      y2 = y1 ;
      x2 = x1 ;
      k += incr ;
    } // end for loop
  }
  catch(vpException &e)
  {
    throw(e);
  }
}