libptouch / file revision

 /*

  #

  #  File        : tutorial.cpp

  #                ( C++ source file )

  #

  #  Description : View the color profile of an image, along the X-axis.

  #                This file is a part of the CImg Library project.

  #                ( http://cimg.sourceforge.net )

  #

  #  Copyright   : David Tschumperle

  #                ( http://www.greyc.ensicaen.fr/~dtschump/ )

  #

  #  License     : CeCILL v2.0

  #                ( http://www.cecill.info/licences/Licence_CeCILL_V2-en.html )

  #

  #  This software is governed by the CeCILL  license under French law and

  #  abiding by the rules of distribution of free software.  You can  use,

  #  modify and/ or redistribute the software under the terms of the CeCILL

  #  license as circulated by CEA, CNRS and INRIA at the following URL

  #  "http://www.cecill.info".

  #

  #  As a counterpart to the access to the source code and  rights to copy,

  #  modify and redistribute granted by the license, users are provided only

  #  with a limited warranty  and the software's author,  the holder of the

  #  economic rights,  and the successive licensors  have only  limited

  #  liability.

  #

  #  In this respect, the user's attention is drawn to the risks associated

  #  with loading,  using,  modifying and/or developing or reproducing the

  #  software by the user in light of its specific status of free software,

  #  that may mean  that it is complicated to manipulate,  and  that  also

  #  therefore means  that it is reserved for developers  and  experienced

  #  professionals having in-depth computer knowledge. Users are therefore

  #  encouraged to load and test the software's suitability as regards their

  #  requirements in conditions enabling the security of their systems and/or

  #  data to be ensured and,  more generally, to use and operate it in the

  #  same conditions as regards security.

  #

  #  The fact that you are presently reading this means that you have had

  #  knowledge of the CeCILL license and that you accept its terms.

  #

 */

 // Include CImg library file and use its main namespace

 #include "CImg.h"

 using namespace cimg_library;

 #ifndef cimg_imagepath

 #define cimg_imagepath "img/"

 #endif

 // Begin the program

 int main(int argc,char **argv) {

   // Define program usage and read command line parameters

   //-------------------------------------------------------

   // Display program usage, when invoked from the command line with option '-h'.

   cimg_usage("View the color profile of an image along the X axis");

   // Read image filename from the command line (or set it to "img/parrot_original.ppm" if option '-i' is not provided).

   const char* file_i = cimg_option("-i",cimg_imagepath "parrot_original.ppm","Input image");

   // Read pre-blurring variance from the command line (or set it to 1.0 if option '-blur' is not provided).

   const double sigma = cimg_option("-blur",1.0,"Variance of gaussian pre-blurring");

   // Init variables

   //----------------

   // Load an image, transform it to a color image (if necessary) and blur it with the standard deviation sigma.

   const CImg<unsigned char> image = CImg<>(file_i).normalize(0,255).blur((float)sigma).resize(-100,-100,1,3);

   // Create two display window, one for the image, the other for the color profile.

   CImgDisplay

     main_disp(image,"Color image (Try to move mouse pointer over)",0),

     draw_disp(500,400,"Color profile of the X-axis",0);

   // Define colors used to plot the profile, and a hatch to draw the vertical line

   unsigned long hatch = 0xF0F0F0F0;

   const unsigned char

     red[]   = { 255,0,0 },

     green[] = { 0,255,0 },

     blue [] = { 0,0,255 },

     black[] = { 0,0,0 };

     // Enter event loop. This loop ends when one of the two display window is closed or when the keys 'ESC' or 'Q' are pressed.

     while (!main_disp.is_closed && !draw_disp.is_closed &&

            !main_disp.is_keyESC && !draw_disp.is_keyESC && !main_disp.is_keyQ && !draw_disp.is_keyQ) {

       // Handle display window resizing (if any)

       if (main_disp.is_resized) main_disp.resize().display(image);

       draw_disp.resize();

       if (main_disp.mouse_x>=0 && main_disp.mouse_y>=0) { // Mouse pointer is over the image

         const int

           xm = main_disp.mouse_x,                     // X-coordinate of the mouse pointer over the image

           ym = main_disp.mouse_y,                     // Y-coordinate of the mouse pointer over the image

           xl = xm*draw_disp.dimx()/main_disp.dimx(),  // Corresponding X-coordinate of the hatched line

           x = xm*image.dimx()/main_disp.dimx(),       // Corresponding X-coordinate of the pointed pixel in the image

           y = ym*image.dimy()/main_disp.dimy();       // Corresponding Y-coordinate of the pointex pixel in the image

         // Retrieve color component values at pixel (x,y)

         const unsigned int

           val_red   = image(x,y,0),

           val_green = image(x,y,1),

           val_blue  = image(x,y,2);

         // Create and display the image of the intensity profile

         CImg<unsigned char>(draw_disp.dimx(),draw_disp.dimy(),1,3,255).

           draw_grid(-50*100.0f/image.dimx(),-50*100.0f/256,0,0,false,true,black,0.2f,0xCCCCCCCC,0xCCCCCCCC).

           draw_axis(0,image.dimx()-1.0f,255.0f,0.0f,black).

           draw_graph(image.get_shared_line(y,0,0),red,1,1,0,255,1).

           draw_graph(image.get_shared_line(y,0,1),green,1,1,0,255,1).

           draw_graph(image.get_shared_line(y,0,2),blue,1,1,0,255,1).

           draw_text(30,5,"Pixel (%d,%d)={%d %d %d}",black,0,1,11,

                     main_disp.mouse_x,main_disp.mouse_y,val_red,val_green,val_blue).

           draw_line(xl,0,xl,draw_disp.dimy()-1,black,0.5f,hatch=cimg::rol(hatch)).

           display(draw_disp);

       } else

         // else display a text in the profile display window.

         CImg<unsigned char>(draw_disp.dimx(),draw_disp.dimy()).fill(255).

           draw_text(draw_disp.dimx()/2-110,draw_disp.dimy()/2-5,"Mouse pointer is outside the image",black).display(draw_disp);

       // Temporize event loop

       cimg::wait(20);

     }

     return 0;

 }