Timer Class

I've written a simple timer class that's really just a wrapper for SDL's timer. Should work on any system you can get SDL on, but you gotta link with it. It's really basic. I think I based it on the one from the programming linux games book-it's been a while, I don't remember. You can have multiple timers, you might want to consider making this class a singleton and having all your objects reference it for thier time updates or passing the time change per frame to each object for it's own update function. Either way, this is what I've been using.

Also, I haven't tested the pause function (I wrote this last year). I think it doesn't work quite right. I might even look into it more tonight and fix it. If I do I'll post it on my website at: http://scourage.servebeer.com/programming/index.html

Header:

#ifndef C_TIMER
#define C_TIMER

#include <SDL/SDL.h>

typedef struct SDL_timer_type				// Create A Structure For The Timer Information

{
  unsigned int start;
  unsigned int elapsed;
  unsigned int last_called;
  unsigned int this_frame;
  
} timer_type;

class c_timer
{
  public:
    c_timer();
    ~c_timer();
    void start();
    float time_this_frame();
    float time_running();
    void pause();
    void unpause();
    
  private:
    timer_type time;
    bool paused;
};

#endif
 

Source:

#include "timer.h"

c_timer::c_timer()
{
    paused=false;
    time.last_called=0;
    time.start=0;
    time.elapsed=0;
    time.this_frame=0;
}

c_timer::~c_timer()
{
}

void c_timer::start()
{
  time.start=SDL_GetTicks();
  time.elapsed=0;
  time.last_called=time.start;
  time.this_frame=0;
  paused=false;
}

float c_timer::time_this_frame()
{
  unsigned int current_time;

  if(paused)
  {
    current_time=time.last_called;
  }
  else
  {
    current_time=SDL_GetTicks();
  }
  time.this_frame=current_time-time.last_called;
  time.last_called=current_time;
  return (float)time.this_frame/1000;
}

float c_timer::time_running()
{
  unsigned int current_time;

  if(paused)
  {
    current_time=time.last_called;
  }
  else
  {
    current_time=SDL_GetTicks();
  }
  time.elapsed=current_time-time.start;
  return (float)time.elapsed/1000;
}


void c_timer::Pause()
{
    paused=true;
}

void c_timer::unpause()
{
    paused=false;
}

 

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[edited by - scourage on January 27, 2004 6:02:43 AM]

Scourage,

Thanks very much for your reply! SOrry i didn''t get back to you last night, but i was totally buggered and went to bed. Anyway, I''ll have a go at implementing your timer that you have posted for me. I really appreciate that! Thanks again!

Cheers,

MeeZ

No sweat, I''ve had plenty of days like that. If you make any improvements in it, or find problems, let me know.

cheers,

Bob

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