diff --git a/examples/tron.cpp b/examples/tron.cpp
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+/*
+ #
+ #  File        : tron.cpp
+ #                ( C++ source file )
+ #
+ #  Description : A clone of the famous (and very simple) Tron game.
+ #                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.h"
+using namespace cimg_library;
+
+// Main procedure
+//----------------
+int main(int argc, char **argv) {
+
+  // Print usage, help and retrieve command line options
+  //-----------------------------------------------------
+  cimg_usage("A very simple Tron game, using the CImg Library");
+  cimg_help("--- Quick help ----------------------------\n"
+            " Player 1 (blue) :\n"
+            " Use keys 'Z' (up), 'S' (down), 'Q' (left)\n"
+            "     and 'D' (right) to control your player.\n"
+            "     Right 'CONTROL' key enables turbospeed\n"
+            " Player 2 (red) : \n"
+            "     Use arrow keys to control your player.\n"
+            "     'TAB' key enables turbospeed.\n"
+            "-------------------------------------------");
+
+  const char *geom      = cimg_option("-g","300x300","Size of the game board");
+  const int delay       = cimg_option("-s",10,"Game speed (lower value means faster)");
+  const bool twoplayers = !cimg_option("-1",false,"One player only");
+  const int zoom        = cimg_option("-z",1,"Zoom factor");
+  const bool full       = cimg_option("-f",false,"Fullscreen mode");
+  unsigned int W = 400, H = 400;
+  std::sscanf(geom,"%u%*c%u",&W,&H);
+
+  // Define game colors and variables
+  //----------------------------------
+  const unsigned char blue[] = { 128,200,255}, red[] = { 255,0,0 }, white[] = { 255,255,255 };
+  int score1 = 0, score2 = 0, round_over = 0, ix1 = -1, iy1 = -1, x1 = 0, y1 = 0, u1 = 0, v1 = 0,
+    ix2 = -1, iy2 = -1, x2 = 0, y2 = 0, u2 = 0, v2 = 0;
+  bool start_round = true, turbo1 = false, turbo2 = false;
+
+  // Create background image
+  //--------------------------
+  CImg<unsigned char> background, img;
+  background.assign(64,64,1,3,0).noise(60).draw_plasma().resize(W,H).blur(2).normalize(0,128).
+    draw_rectangle(0,0,W-1,H-1,white,1.0f,~0U);
+
+  // Open display window
+  //---------------------
+  CImgDisplay disp(background,"* CImg-Tron *");
+  if (zoom>1) disp.resize(-100*zoom,-100*zoom);
+  if (full) disp.toggle_fullscreen().display(background);
+
+  // Start main game loop
+  //----------------------
+  while (!disp.is_closed() && !disp.is_keyESC()) {
+
+    // Init new game round if necessary
+    //----------------------------------
+    if (start_round) {
+
+      // Init game variables
+      round_over = 0;
+      ix1 = -1; iy1 = -1; x1 = 10; y1 = 10; u1 = 1; v1 = 0; turbo1 = false;
+      ix2 = -1; iy2 = -1; x2 = W - 11; y2 = H - 11; u2 = -1; v2 = 0; turbo2 = false;
+      img = background;
+      start_round = false;
+
+      // Display a simple pre-round page
+      CImg<unsigned char> logo, pressakey;
+      logo.draw_text(0,0," CImg-Tron ",white,0,1,33).resize(-100,-100,1,3);
+      CImg<unsigned char> tmp = (+background).draw_image((W - logo.width())/2,(H - logo.height())/2 - 20,
+                                                         logo,logo.get_channel(0).dilate(6).normalize(0,1)).
+        draw_text(W/2 - 60,H/2 + 10,"Blue ( %u )",blue,0,1,13,score1).
+        draw_text(W/2 + 10,H/2 + 10,"Red ( %u )",red,0,1,13,score2);
+      pressakey.draw_text(0,0,"* Press a key to start round *",white);
+      for (float i = 0; i<1; i+=0.05f) ((+tmp)*=i).display(disp.wait(20));
+      disp.flush();
+      for (unsigned long t = 0; !disp.key() && !disp.is_closed(); ++t) {
+        if (!(t%10)) { if (t%20) disp.display(tmp);
+          else disp.display((+tmp).draw_image(W/2 - 70,H/2 + 50,pressakey,pressakey,1,255)); }
+	if (disp.wait(20).is_resized()) disp.resize(disp);
+      }
+      if (disp.is_keyESC()) disp.flush();
+    }
+
+    // Test collision between players and borders
+    if (x1<0 || x1>=img.width() || y1<0 || y1>=img.height() ||
+        img(x1,y1,0)!=background(x1,y1,0) ||
+        img(x1,y1,1)!=background(x1,y1,1) ||
+        img(x1,y1,2)!=background(x1,y1,2) ||
+        ((ix1>=0 || iy1>=0) && (img(ix1,iy1,0)!=background(ix1,iy1,0) ||  // Collision test for turbo mode
+                                img(ix1,iy1,1)!=background(ix1,iy1,1) ||
+                                img(ix1,iy1,2)!=background(ix1,iy1,2)))) { round_over=1; score2++; }
+    if (twoplayers) {
+      if (x2<0 || x2>=img.width() || y2<0 || y2>=img.height() ||
+          img(x2,y2,0)!=background(x2,y2,0) ||
+          img(x2,y2,1)!=background(x2,y2,1) ||
+          img(x2,y2,2)!=background(x2,y2,2) ||
+          ((ix2>=0 || iy2>=0) && (img(ix2,iy2,0)!=background(ix2,iy2,0) ||  // Collision test for turbo mode
+                                  img(ix2,iy2,1)!=background(ix2,iy2,1) ||
+                                  img(ix2,iy2,2)!=background(ix2,iy2,2)))) { round_over=2; score1++; }
+    }
+
+    // Draw new players positions
+    img.draw_point(x1,y1,blue);
+    if (ix1>=0 && iy1>=0) img.draw_point(ix1,iy1,blue);
+    if (twoplayers) {
+      img.draw_point(x2,y2,red);
+      if (ix2>=0 && iy2>=0) img.draw_point(ix2,iy2,red);
+    }
+    if (disp.is_resized()) disp.resize(disp);
+    img.display(disp);
+
+    // Update players positions
+    x1+=u1; y1+=v1;
+    if (turbo1) { ix1 = x1; iy1 = y1; x1+=u1; y1+=v1; } else { ix1 = iy1 = -1; }
+    if (twoplayers) {
+      x2+=u2; y2+=v2;
+      if (turbo2) { ix2 = x2; iy2 = y2; x2+=u2; y2+=v2; } else { ix2 = iy2 = -1; }
+    }
+
+    // Test keyboard events
+    int nu1 = u1, nv1 = v1, nu2 = u2, nv2 = v2;
+    if (disp.is_keyARROWLEFT())  { nu1 = -1; nv1 = 0; }
+    if (disp.is_keyARROWRIGHT()) { nu1 = 1; nv1 = 0; }
+    if (disp.is_keyARROWUP())    { nu1 = 0; nv1 = -1; }
+    if (disp.is_keyARROWDOWN())  { nu1 = 0; nv1 = 1; }
+    turbo1 = disp.is_keyCTRLRIGHT();
+    if (twoplayers) {
+      if (disp.is_keyQ()) { nu2 = -1; nv2 = 0; }
+      if (disp.is_keyD()) { nu2 = 1; nv2 = 0; }
+      if (disp.is_keyZ()) { nu2 = 0; nv2 = -1; }
+      if (disp.is_keyS()) { nu2 = 0; nv2 = 1; }
+      turbo2 = disp.is_keyTAB();
+    }
+    if (nu1!=-u1 && nv1!=-v1) { u1 = nu1; v1 = nv1; }
+    if (nu2!=-u2 && nv2!=-v2) { u2 = nu2; v2 = nv2; }
+
+    // Check if round is over.
+    if (round_over) {
+      const int xc = round_over==1?x1:x2, yc = round_over==1?y1:y2;
+      for (int r=0; r<50; r+=3) img.draw_circle(xc,yc,r,round_over==1?blue:red,r/300.0f).display(disp.wait(20));
+      for (int rr=0; rr<50; rr+=3)
+        ((+img)*=(50 - rr)/50.0f).draw_circle(xc,yc,(50 + rr),round_over==1?blue:red,1/6.0f).display(disp.wait(20));
+      start_round = true;
+    }
+
+    // Wait a small amount of time
+    disp.wait(delay);
+  }
+  return 0;
+}