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+/*
+ #
+ #  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.eu )
+ #
+ #  Copyright   : David Tschumperle
+ #                ( http://tschumperle.users.greyc.fr/ )
+ #
+ #  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
+
+// Main procedure
+//----------------
+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.ppm" if option '-i' is not provided).
+  const char* file_i = cimg_option("-i",cimg_imagepath "parrot.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 int 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.width()/main_disp.width(),  // Corresponding X-coordinate of the hatched line
+          x = xm*image.width()/main_disp.width(),     // Corresponding X-coordinate of the pointed pixel in the image
+          y = ym*image.height()/main_disp.height();   // 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.width(),draw_disp.height(),1,3,255).
+          draw_grid(-50*100.0f/image.width(),-50*100.0f/256,0,0,false,true,black,0.2f,0xCCCCCCCC,0xCCCCCCCC).
+          draw_axes(0,image.width() - 1.0f,255.0f,0.0f,black).
+          draw_graph(image.get_shared_row(y,0,0),red,1,1,0,255,1).
+          draw_graph(image.get_shared_row(y,0,1),green,1,1,0,255,1).
+          draw_graph(image.get_shared_row(y,0,2),blue,1,1,0,255,1).
+          draw_text(30,5,"Pixel (%d,%d)={%d %d %d}",black,0,1,16,
+                    main_disp.mouse_x(),main_disp.mouse_y(),val_red,val_green,val_blue).
+          draw_line(xl,0,xl,draw_disp.height() - 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.width(),draw_disp.height()).fill(255).
+          draw_text(draw_disp.width()/2 - 130,draw_disp.height()/2 - 5,"Mouse pointer is outside the image",
+                    black,0,1,16).display(draw_disp);
+
+      // Temporize event loop
+      cimg::wait(20);
+    }
+
+    return 0;
+}