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134 lines
6 KiB
C++
134 lines
6 KiB
C++
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/*
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#
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# File : tutorial.cpp
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# ( C++ source file )
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#
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# Description : View the color profile of an image, along the X-axis.
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# This file is a part of the CImg Library project.
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# ( http://cimg.eu )
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#
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# Copyright : David Tschumperlé
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# ( http://tschumperle.users.greyc.fr/ )
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#
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# License : CeCILL v2.0
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# ( http://www.cecill.info/licences/Licence_CeCILL_V2-en.html )
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#
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# This software is governed by the CeCILL license under French law and
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# abiding by the rules of distribution of free software. You can use,
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# modify and/ or redistribute the software under the terms of the CeCILL
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# license as circulated by CEA, CNRS and INRIA at the following URL
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# "http://www.cecill.info".
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#
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# As a counterpart to the access to the source code and rights to copy,
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# modify and redistribute granted by the license, users are provided only
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# with a limited warranty and the software's author, the holder of the
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# economic rights, and the successive licensors have only limited
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# liability.
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#
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# In this respect, the user's attention is drawn to the risks associated
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# with loading, using, modifying and/or developing or reproducing the
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# software by the user in light of its specific status of free software,
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# that may mean that it is complicated to manipulate, and that also
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# therefore means that it is reserved for developers and experienced
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# professionals having in-depth computer knowledge. Users are therefore
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# encouraged to load and test the software's suitability as regards their
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# requirements in conditions enabling the security of their systems and/or
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# data to be ensured and, more generally, to use and operate it in the
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# same conditions as regards security.
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#
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# The fact that you are presently reading this means that you have had
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# knowledge of the CeCILL license and that you accept its terms.
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#
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*/
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// Include CImg library file and use its main namespace
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#include "CImg.h"
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using namespace cimg_library;
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#ifndef cimg_imagepath
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#define cimg_imagepath "img/"
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#endif
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// Main procedure
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//----------------
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int main(int argc,char **argv) {
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// Define program usage and read command line parameters
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//-------------------------------------------------------
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// Display program usage, when invoked from the command line with option '-h'.
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cimg_usage("View the color profile of an image along the X axis");
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// Read image filename from the command line (or set it to "img/parrot.ppm" if option '-i' is not provided).
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const char* file_i = cimg_option("-i",cimg_imagepath "parrot.ppm","Input image");
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// Read pre-blurring variance from the command line (or set it to 1.0 if option '-blur' is not provided).
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const double sigma = cimg_option("-blur",1.0,"Variance of gaussian pre-blurring");
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// Init variables
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//----------------
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// Load an image, transform it to a color image (if necessary) and blur it with the standard deviation sigma.
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const CImg<unsigned char> image = CImg<>(file_i).normalize(0,255).blur((float)sigma).resize(-100,-100,1,3);
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// Create two display window, one for the image, the other for the color profile.
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CImgDisplay
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main_disp(image,"Color image (Try to move mouse pointer over)",0),
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draw_disp(500,400,"Color profile of the X-axis",0);
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// Define colors used to plot the profile, and a hatch to draw the vertical line
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unsigned int hatch = 0xF0F0F0F0;
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const unsigned char
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red[] = { 255,0,0 },
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green[] = { 0,255,0 },
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blue [] = { 0,0,255 },
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black[] = { 0,0,0 };
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// Enter event loop. This loop ends when one of the two display window is closed or
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// when the keys 'ESC' or 'Q' are pressed.
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while (!main_disp.is_closed() && !draw_disp.is_closed() &&
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!main_disp.is_keyESC() && !draw_disp.is_keyESC() && !main_disp.is_keyQ() && !draw_disp.is_keyQ()) {
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// Handle display window resizing (if any)
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if (main_disp.is_resized()) main_disp.resize().display(image);
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draw_disp.resize();
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if (main_disp.mouse_x()>=0 && main_disp.mouse_y()>=0) { // Mouse pointer is over the image
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const int
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xm = main_disp.mouse_x(), // X-coordinate of the mouse pointer over the image
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ym = main_disp.mouse_y(), // Y-coordinate of the mouse pointer over the image
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xl = xm*draw_disp.width()/main_disp.width(), // Corresponding X-coordinate of the hatched line
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x = xm*image.width()/main_disp.width(), // Corresponding X-coordinate of the pointed pixel in the image
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y = ym*image.height()/main_disp.height(); // Corresponding Y-coordinate of the pointex pixel in the image
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// Retrieve color component values at pixel (x,y)
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const unsigned int
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val_red = image(x,y,0),
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val_green = image(x,y,1),
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val_blue = image(x,y,2);
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// Create and display the image of the intensity profile
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CImg<unsigned char>(draw_disp.width(),draw_disp.height(),1,3,255).
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draw_grid(-50*100.0f/image.width(),-50*100.0f/256,0,0,false,true,black,0.2f,0xCCCCCCCC,0xCCCCCCCC).
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draw_axes(0,image.width() - 1.0f,255.0f,0.0f,black).
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draw_graph(image.get_shared_row(y,0,0),red,1,1,0,255,1).
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draw_graph(image.get_shared_row(y,0,1),green,1,1,0,255,1).
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draw_graph(image.get_shared_row(y,0,2),blue,1,1,0,255,1).
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draw_text(30,5,"Pixel (%d,%d)={%d %d %d}",black,0,1,16,
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main_disp.mouse_x(),main_disp.mouse_y(),val_red,val_green,val_blue).
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draw_line(xl,0,xl,draw_disp.height() - 1,black,0.5f,hatch=cimg::rol(hatch)).
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display(draw_disp);
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} else
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// else display a text in the profile display window.
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CImg<unsigned char>(draw_disp.width(),draw_disp.height()).fill(255).
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draw_text(draw_disp.width()/2 - 130,draw_disp.height()/2 - 5,"Mouse pointer is outside the image",
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black,0,1,16).display(draw_disp);
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// Temporize event loop
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cimg::wait(20);
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}
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return 0;
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}
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