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 */
initLevel()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 */
evaluateCommandLine(int argc,char ** argv)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
finish(int sig)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
drawscore()125 void drawscore()
126 {
127 statusDisplay(level, score, lives);
128 }
129
130
131 /**
132 * reads input from keyboard and do action
133 */
readInput()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 */
handleTimer()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 */
setUpTimer()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
main(int argc,char ** argv)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
doScoring(int alienType)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
368