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 "ufo.h"
26 #include "aliens.h"
27 #include "nInvaders.h"
28
29 static int fShowUfo = 0;
30
31 /**
32 * initialize ufo attributes
33 */
ufoReset()34 void ufoReset()
35 {
36 ufoClear(ufo.posX, ufo.posY); // clear old position of player
37
38 fShowUfo = 0; // do not show ufo
39 ufo.posY = UFOPOSY; // set vertical Position
40 ufo.posX = SCREENWIDTH - UFOWIDTH;// set horizontal Position
41 }
42
43 /**
44 * move ufo horizontally to position posX
45 */
ufoMove(int posX)46 static void ufoMove(int posX)
47 {
48 ufoClear(ufo.posX, ufo.posY); // clear sprite
49 ufo.posX = posX;
50 ufoRefresh();
51 ufoDisplay(ufo.posX, ufo.posY);
52 }
53
54
55 /**
56 * move ufo and check if it reached the left screen border
57 */
ufoMoveLeft()58 void ufoMoveLeft()
59 {
60 // check if space between ufo and screen border is big enough
61 if (ufo.posX > 1) {
62 // desired movement is possible
63 ufoMove(ufo.posX - 1);
64 } else {
65 ufoReset();
66 }
67 }
68
69 /**
70 * check if the first screen line is free for the ufo and
71 * display it randomly
72 */
ufoShowUfo()73 int ufoShowUfo()
74 {
75 if (aliens.posY > 0 && fShowUfo == 0) { // aliens one line down
76 if ((random() % 200) == 0) {
77 fShowUfo = 1;
78 }
79 }
80
81 return fShowUfo;
82 }
83
84 /**
85 * check if ufo was hit by player and delete it from screen
86 */
ufoHitCheck(int shotX,int shotY)87 int ufoHitCheck(int shotX, int shotY)
88 {
89 int fUfoWasHit = 0;
90
91 // if shot reached vertikal position of ufo
92 if (shotY == UFOPOSY) {
93 // if shot hits ufo
94 if (shotX >= ufo.posX && shotX <= ufo.posX + UFOWIDTH -1) {
95 ufoReset();
96 fUfoWasHit = 1;
97 }
98 }
99
100 return fUfoWasHit;
101 }
102