Make a loading screen

[Sylvagon]

I am trying to make a text RPG and I have a series of class creators, for example, it takes a long time to make all the NPC's in the game, so, for the users benefit, I wanted to have a loading screen. And, I want the loading screen to actually work and display how far it really is.

I want it to look something like:

[=                   ]  5%
[==                  ] 10%
[=========           ] 50 %

(You get the idea)

Any help would be greatly appreciated, thanks!

[Duthomhas]

Here you go.

#include <chrono>
#include <iomanip>
#include <iostream>
#include <string>
#include <thread>

double do_something()
{
  // This function is just a stub to pretend it is doing something useful.
  // It returns the percent completion of the task (in 0..1).
  
  static auto start = std::chrono::system_clock::now();
  static auto stop  = start + std::chrono::seconds( 10 );
  
  std::this_thread::sleep_for( std::chrono::milliseconds( 500 ) );
  
  auto now = std::chrono::system_clock::now();
  return (double)(now - start).count() / (stop - start).count();
}

void show_progress( int width, double percent_done )
{
  int n = (width - 2) * percent_done + 0.5;
  std::cout 
    << "\r["
    << std::string( n, '=' )
    << std::string( width - 2 - n, ' ' )
    << "]"
    << std::setw( 4 ) << (int)(percent_done * 100 + 0.5) << "%"
    << std::flush;
}

int main()
{
  double percent_done;
  show_progress( 50, 0 );
  while ((percent_done = do_something()) < 1)
    show_progress( 50, percent_done );
  show_progress( 50, 1 );
  std::cout << "\n";
}

The CR character '\r' is the magic that causes the cursor to return to the left side of the screen.

Hope this helps.