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git-subtree-dir: external/CImg git-subtree-split: c0becdf881b0f3e2445975cac01c2422170d1fd9
357 lines
13 KiB
C++
357 lines
13 KiB
C++
/*
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#
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# File : curve_editor2d.cpp
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# ( C++ source file )
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#
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# Description : A simple user interface to construct 2D spline curves.
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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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# Antonio Albiol Colomer
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# ( http://personales.upv.es/~aalbiol/index-english.html )
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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.h"
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using namespace cimg_library;
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#undef min
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#undef max
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// Compute distance from a point to a segment.
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//---------------------------------------------
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float dist_segment(const float x, const float y, const float x1, const float y1, const float x2, const float y2) {
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const float
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dx = x2 - x1,
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dy = y2 - y1,
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long_segment = (float)std::sqrt(dx*dx + dy*dy);
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if (long_segment==0) { const float ddx = x - x1, ddy = y - y1; return (float)std::sqrt(ddx*ddx + ddy*ddy); }
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const float
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unitx = dx/long_segment,
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unity = dy/long_segment,
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vx = x - x1,
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vy = y - y1,
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long_proy = vx*unitx + vy*unity,
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proyx = x1 + long_proy*unitx,
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proyy = y1 + long_proy*unity;
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if (long_proy>long_segment) { const float ddx = x - x2, ddy = y - y2; return std::sqrt(ddx*ddx + ddy*ddy); }
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else if (long_proy<0) { const float ddx = x - x1, ddy = y - y1; return std::sqrt(ddx*ddx + ddy*ddy); }
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const float ddx = x - proyx, ddy = y - proyy;
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return std::sqrt(ddx*ddx + ddy*ddy);
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}
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// Main procedure
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//---------------
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int main(int argc, char **argv) {
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// Read command line parameters
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//-----------------------------
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cimg_usage("2D Spline Curve Editor");
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const char *file_i = cimg_option("-i",(char*)0,"Input image");
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const float contrast = cimg_option("-contrast",0.6f,"Image contrast");
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const char *file_ip = cimg_option("-ip",(char*)0,"Input control points");
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const char *file_oc = cimg_option("-oc",(char*)0,"Output curve points");
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const char *file_op = cimg_option("-op",(char*)0,"Output control points");
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const char *file_od = cimg_option("-od",(char*)0,"Output distance function");
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bool interp = cimg_option("-poly",true,"Use polynomial interpolation");
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bool closed = cimg_option("-closed",true,"Closed curve");
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bool show_tangents = cimg_option("-tangents",false,"Show tangents");
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bool show_points = cimg_option("-points",true,"Show control points");
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bool show_outline = cimg_option("-outline",true,"Show polygon outline");
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bool show_indices = cimg_option("-indices",true,"Show points indices");
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bool show_coordinates = cimg_option("-coords",false,"Show points coordinates");
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const float precision = cimg_option("-prec",0.05f,"Precision of curve discretization");
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// Init image data
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//-----------------
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const unsigned char yellow[] = { 255,255,0 }, white[] = { 255,255,255 }, green[] = { 0,255,0 },
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blue[] = { 120,200,255 }, purple[] = { 255,100,255 }, black[] = { 0,0,0 };
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CImg<unsigned char> img0, img, help_img;
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if (file_i) {
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std::fprintf(stderr,"\n - Load input image '%s' : ",cimg::basename(file_i));
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img0 = CImg<>(file_i).normalize(0,255.0f*contrast);
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std::fprintf(stderr,"Size = %dx%dx%dx%d \n",img0.width(),img0.height(),img0.depth(),img0.spectrum());
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img0.resize(-100,-100,1,3);
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}
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else {
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std::fprintf(stderr,"\n - No input image specified, use default 512x512 image.\n");
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img0.assign(512,512,1,3,0).draw_grid(32,32,0,0,false,false,green,0.4f,0xCCCCCCCC,0xCCCCCCCC);
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}
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help_img.assign(220,210,1,3,0).
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draw_text(5,5,
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"------------------------------------------\n"
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"2D Curve Editor\n"
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"------------------------------------------\n"
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"Left button : Create or move control point\n"
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"Right button : Delete control point\n"
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"Spacebar : Switch interpolation\n"
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"Key 'C' : Switch open/closed mode\n"
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"Key 'T' : Show/hide tangents\n"
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"Key 'P' : Show/hide control points\n"
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"Key 'O' : Show/hide polygon outline\n"
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"Key 'N' : Show/hide points indices\n"
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"Key 'X' : Show/hide points coordinates\n"
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"Key 'H' : Show/hide this help\n"
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"Key 'S' : Save control points\n"
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"Key 'R' : Reset curve\n",
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green);
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CImgDisplay disp(img0,"2D Curve Editor",0);
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CImgList<float> points, curve;
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bool moving = false, help = !file_i;
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if (file_ip) {
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std::fprintf(stderr," - Load input control points '%s' : ",cimg::basename(file_ip));
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points = CImg<>(file_ip).transpose()<'x';
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std::fprintf(stderr," %u points\n",points.size());
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}
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// Enter interactive loop
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//------------------------
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while (!disp.is_closed() && !disp.is_keyESC() && !disp.is_keyQ()) {
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// Handle mouse manipulation
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//---------------------------
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const unsigned int button = disp.button();
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const float
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mx = disp.mouse_x()*(float)img0.width()/disp.width(),
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my = disp.mouse_y()*(float)img0.height()/disp.height();
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if (points && button && mx>=0 && my>=0) {
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// Find nearest point and nearest segment
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float dmin_pt = cimg::type<float>::max(), dmin_seg = dmin_pt;
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unsigned int p_pt = 0, p_seg = 0;
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cimglist_for(points,p) {
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const unsigned int
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pnext = closed?(p + 1)%points.size():(p + 1<(int)points.size()?p + 1:p);
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const float
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xp = points(p,0),
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yp = points(p,1);
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const float
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d_pt = (xp - mx)*(xp - mx) + (yp - my)*(yp - my),
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d_seg = dist_segment(mx,my,xp,yp,points(pnext,0),points(pnext,1));
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if (d_pt<dmin_pt) { dmin_pt = d_pt; p_pt = p; }
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if (d_seg<dmin_seg) { dmin_seg = d_seg; p_seg = p; }
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}
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// Handle button
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if (button&1) {
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if (dmin_pt<100 || moving) { points(p_pt,0) = mx; points(p_pt,1) = my; }
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else points.insert(CImg<>::vector(mx,my),p_seg + 1);
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moving = true;
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}
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if (button&2 && dmin_pt<100) {
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if (points.size()>3) points.remove(p_pt);
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disp.set_button();
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}
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}
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if (!button) moving = false;
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if (disp.key()) {
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switch (disp.key()) {
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case cimg::keySPACE : interp = !interp; break;
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case cimg::keyC : closed = !closed; break;
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case cimg::keyT : show_tangents = !show_tangents; break;
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case cimg::keyP : show_points = !show_points; break;
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case cimg::keyO : show_outline = !show_outline; break;
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case cimg::keyN : show_indices = !show_indices; break;
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case cimg::keyX : show_coordinates = !show_coordinates; break;
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case cimg::keyR : points.assign(); break;
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case cimg::keyH : help = !help; break;
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case cimg::keyS : {
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const char *filename = file_op?file_op:"curve_points.dlm";
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std::fprintf(stderr," - Save control points in '%s'\n",filename);
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(points>'x').transpose().save(filename);
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} break;
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}
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disp.set_key();
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}
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// Init list of points if empty
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//------------------------------
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if (!points) {
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const float
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x0 = img0.width()/4.0f,
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y0 = img0.height()/4.0f,
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x1 = img0.width() - x0,
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y1 = img0.height() - y0;
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points.insert(CImg<>::vector(x0,y0)).
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insert(CImg<>::vector(x1,y0)).
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insert(CImg<>::vector(x1,y1)).
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insert(CImg<>::vector(x0,y1));
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}
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// Estimate curve tangents
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//-------------------------
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CImg<> tangents(points.size(),2);
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cimglist_for(points,p) {
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const unsigned int
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p0 = closed?(p + points.size() - 1)%points.size():(p?p - 1:0),
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p1 = closed?(p + 1)%points.size():(p + 1<(int)points.size()?p + 1:p);
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const float
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x = points(p,0),
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y = points(p,1),
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x0 = points(p0,0),
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y0 = points(p0,1),
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x1 = points(p1,0),
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y1 = points(p1,1),
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u0 = x - x0,
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v0 = y - y0,
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n0 = 1e-8f + (float)std::sqrt(u0*u0 + v0*v0),
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u1 = x1 - x,
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v1 = y1 - y,
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n1 = 1e-8f + (float)std::sqrt(u1*u1 + v1*v1),
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u = u0/n0 + u1/n1,
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v = v0/n0 + v1/n1,
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n = 1e-8f + (float)std::sqrt(u*u + v*v),
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fact = 0.5f*(n0 + n1);
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tangents(p,0) = fact*u/n;
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tangents(p,1) = fact*v/n;
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}
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// Estimate 3th-order polynomial interpolation
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//---------------------------------------------
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curve.assign();
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const unsigned int pmax = points.size() - (closed?0:1);
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for (unsigned int p0 = 0; p0<pmax; p0++) {
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const unsigned int
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p1 = closed?(p0 + 1)%points.size():(p0 + 1<points.size()?p0 + 1:p0);
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const float
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x0 = points(p0,0),
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y0 = points(p0,1),
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x1 = points(p1,0),
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y1 = points(p1,1);
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float ax = 0, bx = 0, cx = 0, dx = 0, ay = 0, by = 0, cy = 0, dy = 0;
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if (interp) {
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const float
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u0 = tangents(p0,0),
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v0 = tangents(p0,1),
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u1 = tangents(p1,0),
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v1 = tangents(p1,1);
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ax = 2*(x0 - x1) + u0 + u1;
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bx = 3*(x1 - x0) - 2*u0 - u1;
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cx = u0;
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dx = x0;
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ay = 2*(y0 - y1) + v0 + v1;
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by = 3*(y1 - y0) - 2*v0 - v1;
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cy = v0;
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dy = y0;
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} else {
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ax = ay = bx = by = 0;
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dx = x0;
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dy = y0;
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cx = x1 - x0;
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cy = y1 - y0;
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}
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const float tmax = 1 + precision;
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for (float t = 0; t<tmax; t+=precision) {
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const float
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xt = ax*t*t*t + bx*t*t + cx*t + dx,
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yt = ay*t*t*t + by*t*t + cy*t + dy;
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curve.insert(CImg<>::vector(xt,yt));
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}
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}
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// Draw curve and display image
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//-------------------------------
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const float
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factx = (float)disp.width()/img0.width(),
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facty = (float)disp.height()/img0.height();
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img = img0.get_resize(disp.width(),disp.height());
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if (help) img.draw_image(help_img,0.6f);
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if (interp && show_outline) {
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CImg<> npoints = points>'x';
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npoints.get_shared_row(0)*=factx;
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npoints.get_shared_row(1)*=facty;
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img.draw_polygon(npoints,blue,0.4f);
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if (closed) img.draw_polygon(npoints,yellow,0.8f,0x11111111);
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else img.draw_line(npoints,yellow,0.8f,0x11111111);
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}
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CImg<> ncurve = curve>'x';
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ncurve.get_shared_row(0)*=factx;
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ncurve.get_shared_row(1)*=facty;
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if (closed) img.draw_polygon(ncurve,white,1.0f,~0U);
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else img.draw_line(ncurve,white);
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if (show_points) cimglist_for(points,p) {
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const float
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x = points(p,0)*factx,
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y = points(p,1)*facty;
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if (show_tangents) {
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const float
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u = tangents(p,0),
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v = tangents(p,1),
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n = 1e-8f + (float)std::sqrt(u*u + v*v),
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nu = u/n,
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nv = v/n;
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img.draw_arrow((int)(x - 15*nu),(int)(y - 15*nv),(int)(x + 15*nu),(int)(y + 15*nv),green);
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}
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if (show_indices) img.draw_text((int)x,(int)(y - 16),"%d",purple,black,1,13,p);
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if (show_coordinates)
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img.draw_text((int)(x - 24),(int)(y + 8),"(%d,%d)",yellow,black,0.5f,13,(int)points(p,0),(int)points(p,1));
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img.draw_circle((int)x,(int)y,3,blue,0.7f);
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}
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img.display(disp);
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disp.wait();
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if (disp.is_resized()) disp.resize(false);
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}
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// Save output result and exit
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//-----------------------------
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if (file_op) {
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std::fprintf(stderr," - Save control points in '%s'\n",cimg::basename(file_op));
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(points>'x').transpose().save(file_op);
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}
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if (file_oc) {
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std::fprintf(stderr," - Save curve points in '%s'\n",cimg::basename(file_oc));
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(curve>'x').transpose().save(file_oc);
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}
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if (file_od) {
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std::fprintf(stderr," - Computing distance function, please wait...."); std::fflush(stderr);
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CImg<> ncurve = (closed?(+curve).insert(curve[0]):curve)>'x';
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const float zero = 0.0f, one = 1.0f;
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CImg<> distance =
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CImg<>(img0.width(),img0.height(),1,1,-1.0f).draw_line(ncurve,&zero).draw_fill(0,0,&one).
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distance(0);
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std::fprintf(stderr,"\n - Save distance function in '%s'\n",cimg::basename(file_od));
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distance.save(file_od);
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}
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std::fprintf(stderr," - Exit.\n");
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std::exit(0);
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return 0;
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}
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