Allegro Space-shooter Game

no-reply@allegro.cc (Octavarium XI) — Sat, 31 Oct 2009 20:41:53 +0000

Hello, everyone!

I'm Octavarium XI. I've been programming C/C++ for about 10 months now.

Just today, I started programming a concept I've been thinking about a lot... And I already have a problem (Never good :p)

I use Dev-C++ and Notepad++ (just a quick note)

First, I tried using classes for drawing and key input, but it kept screwing up. So I decided to just use normal old functions.

Now, it'll compile, yes, but for some reason it just doesn't work. Can someone clarify the reason?

EDIT: Code removed, I'll attach it

Thanks!
Octavarium XI

no-reply@allegro.cc (verthex) — Sat, 31 Oct 2009 20:53:00 +0000

Octavarium XI said:

I use Dev-C++ and Notepad++ (just a quick note)

I suggest switching to code::blocks and also please paste your code. Nothing personal but everyone here is a stranger and that could be a virus for all I know. I just dont have antivirus running right now.

no-reply@allegro.cc (Octavarium XI) — Sat, 31 Oct 2009 21:20:34 +0000

Yes, you have reasons to be suspicous. A C++/ASM programmer who has 2 posts?

Anyways, here's the code.

The parenthesis and spacing are screwed up because of Allegro.cc; I don't know why o_O

#SelectExpand
   1#include 
   2
   3void init();
   4void deinit();
   5
   6int endflag  = 0  ; //Flag to end the game
   7int curbul   = 1  ; //Current bullet
   8double bulx[10]   ; //Bullet X coordinate
   9double buly[10]   ; //Bullet Y coordinate
  10bool live[10]     ; //Is the bullet live?
  11double xturn = 0.0; //Bullet spin/turn
  12double yturn = 5.0; //Bullet speed forward
  13
  14
  15void left()
  16{
  17            if (xturn >= -5)
  18                           xturn = (xturn - 0.1);
  19} //void left()
  20
  21void right()
  22{
  23                  if (xturn <= 5)
  24                                 xturn = (xturn + 0.1);
  25} //void right()
  26
  27void checkforkey()
  28{
  29     if (key[KEY_LEFT]){
  30                        left();
  31                        }
  32     else if (key[KEY_RIGHT]){
  33                              right();
  34                              }
  35     else if (key[KEY_SPACE]){
  36                              if (curbul < 11)
  37                              {
  38                                         live[curbul] = true;
  39                                         bulx[curbul] = 120;
  40                                         buly[curbul] = 450;
  41                                         ++curbul;
  42                              } //if (curbul < 11)
  43                              } //else if (key[KEY_SPACE])
  44} //void checkforkey()
  45
  46void checkfordraw()
  47{
  48     int counter = 0;
  49     for( counter = 1 ; counter == 10 ; ++counter )
  50     {
  51          if ( live[counter] = true )
  52          {
  53               circlefill(
  54                          screen,
  55                          bulx[counter],
  56                          buly[counter],
  57                          3,
  58                          makecol(
  59                                  255,
  60                                  123,
  61                                  123
  62                                     ) //makecol()
  63                                     );//circlefill()
  64               bulx[counter] = bulx[counter] + xturn;
  65               buly[counter] = buly[counter] - yturn;
  66          } //if ( live[counter] = true )
  67     } //for( counter == 1 ; counter == 10 ; ++counter )
  68     
  69     circlefill(
  70                screen,
  71                120,
  72                450,
  73                20,
  74                makecol(
  75                        255,
  76                        255,
  77                        255
  78                           ) //makecol()
  79                           ); //circlefill()
  80} //void checkfordraw()     
  81
  82int main() 
  83{
  84  init();
  85
  86  while (endflag == 0) 
  87    {
  88        acquire_screen();
  89        
  90    if (key[KEY_ESC])
  91                     endflag = 1;
  92                 
  93    checkforkey();
  94    checkfordraw();
  95    
  96    release_screen();
  97    clear_keybuf();
  98    
  99    rest(50);
 100  }
 101
 102  deinit();
 103  return 0;
 104} //int main()
 105END_OF_MAIN()
 106
 107void init() 
 108{
 109  int depth, res;
 110  allegro_init();
 111  depth = desktop_color_depth();
 112  if (depth == 0) depth = 32;
 113  set_color_depth(depth);
 114  res = set_gfx_mode(GFX_AUTODETECT_WINDOWED, 240, 500, 0, 0);
 115  if (res != 0) {
 116    allegro_message(allegro_error);
 117    exit(-1);
 118  }
 119
 120  install_timer();
 121  install_keyboard();
 122  install_mouse();
 123} //void init()
 124
 125void deinit() 
 126{
 127  clear_keybuf();
 128} //void deinit()

no-reply@allegro.cc (verthex) — Sat, 31 Oct 2009 21:24:23 +0000

You just have to click the help button and use the CODE tag to enclose your code.

no-reply@allegro.cc (Octavarium XI) — Sat, 31 Oct 2009 21:42:51 +0000

Thanks, but why won't it work? o:

no-reply@allegro.cc (verthex) — Sat, 31 Oct 2009 21:52:34 +0000

I might be mistaken but your global declaration for xturn is decremented until -5 and incremented until 5 only once and then it stops the motion. I think you need to somehow keep this variable in a different place, not globally.

void left() { if (xturn >= -5) xturn = (xturn - 0.1); } //void left() void right() { if (xturn <= 5) xturn = (xturn + 0.1); } //void right()

no-reply@allegro.cc (Octavarium XI) — Sat, 31 Oct 2009 21:58:03 +0000

Well yah, but why won't it draw the bullets? o:

no-reply@allegro.cc (verthex) — Sat, 31 Oct 2009 22:06:55 +0000

Is your live counter in sync with your bullet? I can't really tell cause

A. Im tired and my eyes are like
B. I'm going to pass out.

no-reply@allegro.cc (kenmasters1976) — Sat, 31 Oct 2009 22:11:51 +0000

Haven't tried your program, just checked your code. I'm guessing you want to draw the bullets in your checkfordraw() function, right?. Then I guess the problem is your for loop. The second expression in a for is a condition, so for( counter = 1 ; counter == 10 ; ++counter ) will never be executed, you probably meant for( counter = 1 ; counter <= 10 ; ++counter ).

no-reply@allegro.cc (Octavarium XI) — Sat, 31 Oct 2009 22:25:31 +0000

Oshi- that explains alot >_< /facepalm

Thanks for the help!

no-reply@allegro.cc (gnolam) — Sun, 01 Nov 2009 06:15:52 +0000

If you're wondering why so few people are responding, it's because "it doesn't work" is never, ever an acceptable problem description. Is it not compiling? Is it crashing? Is it running but showing some sort of wrong result? Until you describe what the problem actually is, in detail (e.g. "When I compile it, I get the following error: ...", "It compiles without warnings, but when I run it the colors are all weird - here's a screenshot"), few people are going to take the time to read through your code. I know I won't.

But from the one line kenmasters1976 quoted, there's a good chance you have a buffer overrun...

no-reply@allegro.cc (kenmasters1976) — Sun, 01 Nov 2009 09:21:48 +0000

gnolam said:

But from the one line kenmasters1976 quoted, there's a good chance you have a buffer overrun...

Let me have another look at his code... yes, you're right.

no-reply@allegro.cc (OnlineCop) — Sun, 01 Nov 2009 10:22:09 +0000

gnolam said:

"it doesn't work" is never, ever an acceptable problem description

Yeah... it doesn't work.

no-reply@allegro.cc (Ron Novy) — Sun, 01 Nov 2009 10:26:29 +0000

Shouldn't it be for(counter = 0; counter < 10 ; counter++) ?

no-reply@allegro.cc (type568) — Mon, 02 Nov 2009 04:39:11 +0000

Ron Novy said:

Shouldn't it be for(counter = 0; counter < 10 ; counter++) ?

He has his own concept, he said.. Respect the youth!

no-reply@allegro.cc (Bob Keane) — Mon, 02 Nov 2009 06:44:47 +0000

Octavarium XI said:

bool live[10] ; //Is the bullet live?

I've got nothing to help you, but I was wondering if you are using a bool on an array to account for multiple bullets on the screen?

no-reply@allegro.cc (kenmasters1976) — Mon, 02 Nov 2009 10:03:19 +0000

Ron Novy said:

Shouldn't it be for(counter = 0; counter < 10 ; counter++) ?

Hopefully he'll be able to fix that.

Bob Keane said:

I've got nothing to help you, but I was wondering if you are using a bool on an array to account for multiple bullets on the screen?

Up to 10 live bullets on screen. Maybe he should change that hardcoded 10 with a #define MAX_BULLETS 10. Of course, he'll also have to take care of if (curbul < 11) 'cause that would mean a crash if he actually ever called checkforkey() with curbul = 10.