Cross-Platform Game Development for C++ Developers, Part IV: ClanLib SDK, Page 3

168 void Boxes::inputHandler(const CL_InputEvent &i)
169 {
170    if (redturn) {
171       switch(i.id) {
172       case CL_KEY_LEFT:
173       case CL_KEY_G:
174          if (curs.x > 1) curs.x--;
175          break;
176       case CL_KEY_RIGHT:
177       case CL_KEY_J:
178          if (curs.x < boardsize) curs.x++;
179          break;
180       case CL_KEY_UP:
181       case CL_KEY_Y:
182          if (!curs.vert && curs.y > 1) {
183             curs.y--;
184             curs.vert = !curs.vert;
185          }
186          else if (curs.vert) curs.vert = false;
187          break;
188       case CL_KEY_DOWN:
189       case CL_KEY_H:
190          if (curs.vert && curs.y < boardsize) {
191             curs.y++;
192             curs.vert = !curs.vert;
193          }
194          else if (!curs.vert) curs.vert = true;
195          break;
196       }
197       if (curs.x == boardsize && !curs.vert) curs.x--;
198       if (curs.y == boardsize && curs.vert)
             curs.vert = false;
199
200       if (i.id == CL_KEY_SPACE || i.id == CL_KEY_ENTER) {
201          if (curs.vert) {
202             if (!ver[curs.x-1][curs.y-1]) {
203                ver[curs.x-1][curs.y-1] = true;
204                if (!findsquares()) redturn = !redturn;
205             }
206          }
207          else {
208             if (!hor[curs.x-1][curs.y-1]) {
209                hor[curs.x-1][curs.y-1] = true;
210                if (!findsquares()) redturn = !redturn;
211             }
212          }
213       }
214    }
215 }

Lastly, the endOfGame() method computes the final score. Remember that the game is not over until the board is full (see line 48) or someone resigns by hitting the ESC key (see line 46). Last of all, you fade out the volume to 0 percent over the course of one second.

217 void Boxes::endOfGame()
218 {
219    // Count scores
220       int redscore, bluescore;
221       redscore = bluescore = 0;
222       for (int x = 0; x < boardsize - 1; x++)
223          for (int y = 0; y < boardsize - 1; y++) {
224             if (squares[x][y] == red) redscore++;
225             else if (squares[x][y] == blue) bluescore++;
226          }
227
228       cout << "Red: " << redscore
               << "\nBlue: " << bluescore
              << endl;
229       if (bluescore != redscore)
230          cout << (bluescore > redscore ? "Blue" : "Red")
                  << " player wins\n";
231       else cout << "It was a tie\n";
232
233       if (fullup) {
234          fade->fade_to_volume(0.0f, 1000);
235          CL_System::sleep(1000);
236       }
237 }

Stay Tuned!

Be sure to come back next week for the fifth and final installment of Cross-Platform Game Development for C++ Developers.

About the Author

Victor Volkman has been writing for C/C++ Users Journal and other programming journals since the late 1980s. He is a graduate of Michigan Tech and a faculty advisor board member for Washtenaw Community College CIS department. Volkman is the editor of numerous books, including C/C++ Treasure Chest and is the owner of Loving Healing Press. He can help you in your quest for open source tools and libraries; just drop an e-mail to sysop@HAL9K.com.