ELEC2645 (2017/18)
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ll13jrm
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Snake.cpp
00001 #include "Snake.h" 00002 00003 ///////////////// constructor/destructor ///////////////// 00004 00005 Snake::Snake() 00006 { 00007 00008 } 00009 00010 Snake::~Snake() 00011 { 00012 00013 } 00014 00015 ///////////////// public methods ///////////////// 00016 00017 void Snake::init(Direction in,Direction cur, int pos_x, int pos_y) 00018 { 00019 00020 _pos.x = pos_x; 00021 _pos.y = pos_y; 00022 set_snake_direction(in, cur); 00023 00024 } 00025 00026 void Snake::update(Direction in, Direction cur) 00027 { 00028 set_current_direction(in); 00029 cur = get_current_direction(); 00030 set_snake_direction(in, cur); 00031 Direction next = get_snake_direction(); 00032 set_snake_position(next); 00033 00034 } 00035 00036 void Snake::draw(N5110 &lcd) 00037 { 00038 00039 lcd.setPixel(_pos.x,_pos.y,true); 00040 00041 } 00042 00043 void Snake::set_snake_direction(Direction input, Direction current) 00044 { 00045 00046 switch(current) { 00047 00048 case CENTRE: 00049 00050 set_centre(input, current); 00051 00052 break; 00053 00054 case N: 00055 00056 set_north(input, current); 00057 00058 break; 00059 00060 case E: 00061 00062 set_east(input, current); 00063 00064 break; 00065 00066 case S: 00067 00068 set_south(input, current); 00069 00070 break; 00071 00072 case W: 00073 00074 set_west(input, current); 00075 00076 break; 00077 00078 default: 00079 00080 00081 //set_centre(input, current); 00082 //error("Invalid state (current)"); 00083 00084 break; 00085 00086 } 00087 00088 00089 } 00090 00091 Direction Snake::get_snake_direction() 00092 { 00093 00094 Direction d = _next; 00095 00096 return d; 00097 00098 } 00099 00100 void Snake::set_centre(Direction input, Direction current) 00101 { 00102 switch(input) { 00103 00104 case CENTRE: 00105 00106 // cannnot be CENTRE 00107 00108 _next = current; 00109 00110 break; 00111 00112 case N: 00113 00114 _next = input; 00115 00116 break; 00117 00118 case E: 00119 00120 _next = input; 00121 00122 break; 00123 00124 case S: 00125 00126 _next = input; 00127 00128 break; 00129 00130 case W: 00131 00132 _next = input; 00133 00134 break; 00135 00136 default: 00137 00138 _next = current; 00139 00140 break; 00141 00142 } 00143 00144 } 00145 void Snake::set_north(Direction input, Direction current) 00146 { 00147 switch(input) { 00148 00149 case CENTRE: 00150 00151 _next = N; 00152 00153 break; 00154 00155 case N: 00156 00157 _next = N; 00158 00159 break; 00160 00161 case E: 00162 00163 _next = E; 00164 00165 break; 00166 00167 case S: 00168 00169 // cannot be S 00170 00171 _next = N; 00172 00173 break; 00174 00175 case W: 00176 00177 _next = W; 00178 00179 break; 00180 00181 default: 00182 00183 _next = current; 00184 00185 break; 00186 00187 } 00188 } 00189 void Snake::set_east(Direction input, Direction current) 00190 { 00191 00192 switch(input) { 00193 00194 case CENTRE: 00195 00196 _next = E; 00197 00198 break; 00199 00200 case N: 00201 00202 _next = N; 00203 00204 break; 00205 00206 case E: 00207 00208 _next = E; 00209 00210 break; 00211 00212 case S: 00213 00214 _next = S; 00215 00216 break; 00217 00218 case W: 00219 00220 // cannot be W 00221 00222 _next = E; 00223 00224 break; 00225 00226 default: 00227 00228 _next = current; 00229 00230 break; 00231 00232 } 00233 00234 00235 } 00236 void Snake::set_south(Direction input, Direction current) 00237 { 00238 switch(input) { 00239 00240 case CENTRE: 00241 00242 _next = S; 00243 00244 break; 00245 00246 case N: 00247 00248 // cannot be N 00249 00250 _next = S; 00251 00252 break; 00253 00254 case E: 00255 00256 _next = E; 00257 00258 break; 00259 00260 case S: 00261 00262 _next = S; 00263 00264 break; 00265 00266 case W: 00267 00268 _next = W; 00269 00270 break; 00271 00272 default: 00273 00274 _next = current; 00275 00276 break; 00277 00278 } 00279 00280 00281 } 00282 void Snake::set_west(Direction input, Direction current) 00283 { 00284 switch(input) { 00285 00286 case CENTRE: 00287 00288 _next = W; 00289 00290 break; 00291 00292 case N: 00293 00294 _next = N; 00295 00296 break; 00297 00298 case E: 00299 00300 // cannot be E 00301 00302 _next = W; 00303 00304 break; 00305 00306 case S: 00307 00308 _next = S; 00309 00310 break; 00311 00312 case W: 00313 00314 _next = W; 00315 00316 break; 00317 00318 default: 00319 00320 _next = current; 00321 00322 break; 00323 00324 } 00325 00326 } 00327 00328 00329 void Snake::set_current_direction(Direction input) 00330 { 00331 00332 // if true the direction cannot be CENTRE 00333 00334 if(get_snake_direction() == CENTRE && input == CENTRE) { 00335 00336 _d = _d; 00337 00338 } 00339 00340 00341 else { 00342 00343 _d = get_snake_direction(); 00344 00345 } 00346 00347 _current = _d; 00348 00349 } 00350 00351 Direction Snake::get_current_direction() 00352 { 00353 00354 Direction d = _current; 00355 00356 return d; 00357 00358 } 00359 00360 void Snake::set_snake_position(Direction next) 00361 { 00362 next = get_snake_direction(); 00363 00364 switch(next) { 00365 00366 case N: 00367 00368 // y increments (inverted due to N5110 class) x is static 00369 00370 _pos.x = _pos.x; 00371 --_pos.y; 00372 00373 break; 00374 00375 case E: 00376 00377 // x increments y is static 00378 00379 ++_pos.x; 00380 _pos.y = _pos.y; 00381 00382 break; 00383 00384 case S: 00385 00386 // y decrements x is static 00387 00388 _pos.x = _pos.x; 00389 ++_pos.y; 00390 00391 break; 00392 00393 case W: 00394 00395 // x decrements y is static 00396 00397 --_pos.x; 00398 _pos.y = _pos.y; 00399 00400 break; 00401 00402 default: 00403 00404 _pos.x = _pos.x; 00405 _pos.y = _pos.y; 00406 00407 break; 00408 00409 } 00410 00411 } 00412 00413 Vector2D Snake::get_snake_position() 00414 { 00415 00416 Vector2D pos = _pos; 00417 00418 return pos; 00419 00420 } 00421 00422 00423 // FSM Attempt 00424 00425 /* 00426 int state = N; 00427 00428 StateDirection fsm[4] = { 00429 00430 {N,{N,E,N,W}}, 00431 {E,{N,E,S,E}}, 00432 {S,{S,E,S,W}}, 00433 {W,{N,W,S,W}} 00434 00435 }; 00436 00437 _direction = fsm[state].output; // set ouput depending on current state 00438 state = fsm[state].nextState[input]; // read input and update curent state 00439 */ 00440 00441 00442
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