c/ninvaders-0.1.1/nInvaders.c

   1 /**
   2  * nInvaders - a space invaders clone for ncurses
   3  * Copyright (C) 2002-2003 Dettus
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  18  *
  19  * homepage: http://ninvaders.sourceforge.net
  20  * mailto: ninvaders-devel@lists.sourceforge.net
  21  *
  22  */
  23
  24
  25 #include <stdio.h>
  26 #include <string.h>
  27 #include <sys/time.h>
  28 #include "nInvaders.h"
  29 #include "player.h"
  30 #include "aliens.h"
  31 #include "ufo.h"
  32
  33 #define FPS 50
  34
  35 int lives;
  36 long score;
  37 int status; // status handled in timer
  38
  39 #define GAME_LOOP 1
  40 #define GAME_NEXTLEVEL 2
  41 #define GAME_PAUSED 3
  42 #define GAME_OVER 4
  43 #define GAME_EXIT 5
  44 #define GAME_HIGHSCORE 6
  45
  46
  47
  48
  49 /**
  50  * initialize level: reset attributes of most units
  51  */
  52 static void initLevel()
  53 {
  54         playerReset();
  55         aliensReset();
  56         ufoReset();
  57         bunkersReset();
  58         render();
  59         drawscore();
  60 }
  61
  62
  63 /**
  64  * evaluate command line parameters
  65  */
  66 static void evaluateCommandLine(int argc, char **argv)
  67 {
  68
  69         // -l : set skill level
  70         if (argc == 3 && strcmp(argv[1], "-l") == 0) {
  71                 if (argv[2][0] >= '0' && argv[2][0] <= '9') {
  72                         skill_level = argv[2][0] - 48;
  73                 } else {
  74                         argc = 2;
  75                 }
  76         }
  77
  78         // -gpl : show GNU GPL
  79         if (argc == 2 && strcmp(argv[1], "-gpl") == 0) {
  80                 showGpl();
  81         }
  82
  83         // wrong command line: show usage
  84         if (argc == 2 || (argc == 3 && strcmp(argv[1], "-l") != 0)) {
  85                 showVersion();
  86                 showUsage();
  87                 exit(1);
  88         }
  89 }
  90
  91
  92 static void finish(int sig)
  93 {
  94         endwin();
  95         showGplShort();
  96
  97         fprintf(stderr,"\n");
  98         fprintf(stderr,"\n");
  99         fprintf(stderr,"=========================================================================\n");
 100         fprintf(stderr,"\n");
 101
 102         fprintf(stderr,"Final score: %7.7ld, Final level: %2.2d\nFinal rating... ",score,level);
 103         if (lives>0)
 104                 fprintf(stderr,"Quitter\n\n");
 105         else if(score<5000)
 106                 fprintf(stderr,"Alien Fodder\n\n");
 107         else if(score<7500)
 108                 fprintf(stderr,"Easy Target\n\n");
 109         else if(score<10000)
 110                 fprintf(stderr,"Barely Mediocre\n\n");
 111         else if(score<12500)
 112                 fprintf(stderr,"Shows Promise\n\n");
 113         else if(score<15000)
 114                 fprintf(stderr,"Alien Blaster\n\n");
 115         else if(score<20000)
 116                 fprintf(stderr,"Earth Defender\n\n");
 117         else if(score>19999)
 118                 fprintf(stderr,"Supreme Protector\n\n");
 119
 120         showVersion();
 121         exit(0);
 122 }
 123
 124
 125 void drawscore()
 126 {
 127         statusDisplay(level, score, lives);
 128 }
 129
 130
 131 /**
 132  * reads input from keyboard and do action
 133  */
 134 void readInput()
 135 {
 136         int ch;
 137         static int lastmove;
 138
 139         ch = getch();           // get key pressed
 140
 141         switch (status) {
 142
 143         case GAME_PAUSED:
 144
 145                 if (ch == 'p') {
 146                         status = GAME_LOOP;
 147                 }
 148                 break;
 149
 150         case GAME_HIGHSCORE:
 151
 152                 if (ch == ' ') {
 153                         titleScreenClear();
 154                         level = 0;      // reset level
 155                         score = 0;      // reset score
 156                         lives = 3;      // restore lives
 157                         status = GAME_NEXTLEVEL;
 158                 } else if (ch == 'q') { // quit game
 159                         status = GAME_EXIT;
 160                 }
 161                 break;
 162
 163         case GAME_OVER:
 164                 break; // don't do anything
 165
 166         default:
 167
 168                 if (ch == 'l' || ch == KEY_RIGHT) {     // move player right
 169                         if (lastmove == 'l') {
 170                                 playerTurboOn();        // enable Turbo
 171                         } else {
 172                                 playerTurboOff();       // disable Turbo
 173                         }
 174                         playerMoveRight();              // move player
 175                         lastmove = 'l';                 // remember last move for turbo mode
 176                 } else if (ch == 'h' || ch == KEY_LEFT) {       // move player left
 177                         if (lastmove == 'h') {
 178                                 playerTurboOn();        // enable Turbo
 179                         } else {
 180                                 playerTurboOff();       // disable Turbo
 181                         }
 182                         playerMoveLeft();               // move player
 183                         lastmove = 'h';                 // remember last move for turbo mode
 184                 } else if (ch == 'k' || ch == ' ') {    // shoot missile
 185                         playerLaunchMissile();
 186                 } else if (ch == 'p') {                 // pause game until 'p' pressed again
 187                         // set status to game paused
 188                         status = GAME_PAUSED;
 189                 } else if (ch == 'W') {                 // cheat: goto next level
 190                         status = GAME_NEXTLEVEL;
 191                 } else if (ch == 'L') {                 // cheat: one more live
 192                         lives++;
 193                         drawscore();
 194                 } else if (ch == 'q') { // quit game
 195                         status = GAME_EXIT;
 196                 } else {                // disable turbo mode if key is not kept pressed
 197                         lastmove = ' ';
 198                 }
 199
 200         } // switch
 201
 202 }
 203
 204
 205 /**
 206  * timer
 207  * this method is executed every 1 / FPS seconds
 208  */
 209 void handleTimer()
 210 {
 211         static int aliens_move_counter = 0;
 212         static int aliens_shot_counter = 0;
 213         static int player_shot_counter = 0;
 214         static int ufo_move_counter = 0;
 215         static int title_animation_counter = 0;
 216         static int game_over_counter = 0;
 217
 218         switch (status) {
 219
 220         case GAME_NEXTLEVEL:    // go to next level
 221
 222                 level++;        // increase level
 223
 224                 initLevel();    // initialize level
 225
 226                 aliens_move_counter = 0;
 227                 aliens_shot_counter = 0;
 228                 player_shot_counter = 0;
 229                 ufo_move_counter = 0;
 230
 231                 weite = (shipnum+(skill_level*10)-(level*5)+5)/10;
 232
 233                 if (weite < 0) {
 234                         weite = 0;
 235                 }
 236
 237                 // change status and start game!
 238                 status = GAME_LOOP;
 239
 240         case GAME_LOOP:          // do game handling
 241
 242                 // move aliens
 243                 if (aliens_move_counter == 0 && aliensMove() == 1) {
 244                         // aliens reached player
 245                         lives = 0;
 246                         status = GAME_OVER;
 247                 }
 248
 249                 // move player missile
 250                 if (player_shot_counter == 0 && playerMoveMissile() == 1) {
 251                         // no aliens left
 252                         status = GAME_NEXTLEVEL;
 253                 }
 254
 255                 // move aliens' missiles
 256                 if (aliens_shot_counter == 0 && aliensMissileMove() == 1) {
 257                         // player was hit
 258                         lives--;                        // player looses one life
 259                         drawscore();                    // draw score
 260                         playerExplode();                // display some explosion graphics
 261                         if (lives == 0) {               // if no lives left ...
 262                                 status = GAME_OVER;             // ... exit game
 263                         }
 264                 }
 265
 266                 // move ufo
 267                 if (ufo_move_counter == 0 && ufoShowUfo() == 1) {
 268                         ufoMoveLeft();                  // move it one position to the left
 269                 }
 270
 271
 272                 if (aliens_shot_counter++ >= 5) {aliens_shot_counter=0;}     // speed of alien shot
 273                 if (player_shot_counter++ >= 1) {player_shot_counter=0;}     // speed of player shot
 274                 if (aliens_move_counter++ >= weite) {aliens_move_counter=0;} // speed of aliend
 275                 if (ufo_move_counter++ >= 3) {ufo_move_counter=0;}           // speed of ufo
 276
 277                 refreshScreen();
 278                 break;
 279
 280         case GAME_PAUSED:    // game is paused
 281                 break;
 282
 283         case GAME_OVER:      // game over
 284                 if (game_over_counter == 100) {
 285                         battleFieldClear();
 286                         status = GAME_HIGHSCORE;
 287                         game_over_counter = 0;
 288                 } else {
 289                         gameOverDisplay();
 290                         game_over_counter++;
 291                 }
 292                 break;
 293
 294         case GAME_EXIT:      // exit game
 295                 finish(0);
 296                 break;
 297
 298         case GAME_HIGHSCORE: // display highscore
 299                 if (title_animation_counter == 0) {
 300                         titleScreenDisplay();
 301                 }
 302
 303                 if (title_animation_counter++ >= 6) {title_animation_counter = 0;} // speed of animation
 304                 break;
 305
 306         }
 307 }
 308
 309
 310 /**
 311  * set up timer
 312  */
 313 void setUpTimer()
 314 {
 315         struct itimerval myTimer;
 316         struct sigaction myAction;
 317         myTimer.it_value.tv_sec = 0;
 318         myTimer.it_value.tv_usec = 1000000 / FPS;
 319         myTimer.it_interval.tv_sec = 0;
 320         myTimer.it_interval.tv_usec = 1000000 / FPS;
 321         setitimer(ITIMER_REAL, &myTimer, NULL);
 322
 323         myAction.sa_handler = &handleTimer;
 324         myAction.sa_flags = SA_RESTART;
 325         sigaction(SIGALRM, &myAction, NULL);
 326 }
 327
 328
 329 int main(int argc, char **argv)
 330 {
 331         weite = 0;
 332         score = 0;
 333         lives = 3;
 334         level = 0;
 335         skill_level = 1;
 336
 337         evaluateCommandLine(argc, argv);        // evaluate command line parameters
 338         graphicEngineInit();                    // initialize graphic engine
 339
 340         // set up timer/ game handling
 341         setUpTimer();
 342         status = GAME_HIGHSCORE;
 343
 344         // read keyboard input
 345         do {
 346                 // do movements and key-checking
 347                 readInput();
 348         } while (0 == 0);
 349
 350         return 0;
 351 }
 352
 353
 354 void doScoring(int alienType)
 355 {
 356         int points[4] = {500, 200, 150, 100};           // 0: ufo, 1:red, 2:green, 3:blue
 357
 358         score += points[alienType];             // every alien type does different scoring points
 359
 360         // every 6000 pts player gets a new live
 361         if (score % 6000 == 0){
 362                 lives++;
 363         }
 364
 365         drawscore();    // display score
 366 }
 367