slow things down a bit

[newbie123]

Hello
I'm trying to make a counter from 0 to 170 and then from 170 to 0. I got it working but its counting very fast. Is there a way to slow the counting down a bit.

I tried to use Clock.GetTime(); but the problem is that the clock count from 0 to 170 for example but i want it to also count backwords from 170 to 0.

here what i got

Code: [Select]


#include <SFML\Graphics.hpp>
#include <iostream>

int main()
{
sf::RenderWindow Window(sf::VideoMode(800, 632, 32), "Tower Defence");
sf::Image Image;
sf::Sprite Sprite;

Image.LoadFromFile("light.png");
Sprite.SetImage(Image);
Sprite.SetPosition(0, 32);
Sprite.SetColor(sf::Color(14,25,52));

sf::Clock Clock;
int Time = 0;
bool up = true;

while(Window.IsOpened())
{
sf::Event Event;
Window.SetFramerateLimit(150);
Window.UseVerticalSync(true);
while (Window.GetEvent(Event))
{
if ((Event.Type == sf::Event::KeyPressed) && (Event.Key.Code == sf::Key::Escape))
Window.Close();

}


if( up )
{
++Time;
}
else
{
--Time;
}

if( Time >= 170 )
up = false;

if( Time <= 0 )
up = true;


Sprite.SetColor(sf::Color(15,10,63, Time));
std::cout<<Time<<"\n";

Window.Clear();
Window.Draw(Sprite);
Window.Display();
}
return 0;
}
[quote][/quote]

[texus]

Do something like this to also make the clock count backwards (this is an example code, not exactly what you have to write):

Code: [Select]


sf::Clock Clock;
int Time = 0;

while (...)
{
    if (up)
    {
        Time += Clock.GetElapsedTime();
        Clock.Reset();
    }
    else
    {
        Time -= Clock.GetElapsedTime()
        Clock.Reset();
    }
}


[newbie123]

Do something like this to also make the clock count backwards (this is an example code, not exactly what you have to write):

Code: [Select]


sf::Clock Clock;
int Time = 0;

while (...)
{
    if (up)
    {
        Time += Clock.GetElapsedTime();
        Clock.Reset();
    }
    else
    {
        Time -= Clock.GetElapsedTime()
        Clock.Reset();
    }
}


well i did this but its still going fast

Code: [Select]


int Time = 0;
bool up = true;

while(Window.IsOpened())
{
if( up )
{
Time += Clock.GetElapsedTime();
}
else
{
Time -= Clock.GetElapsedTime();
Clock.Reset();
}

if( Time >= 170 )
up = false;

if( Time <= 0 )
up = true;


Sprite.SetColor(sf::Color(15,10,63, Time));
std::cout<<Time<<"\n";
}

[texus]

You only reset the clock when up is false, also do this when it is true.


There are two ways I see to fix the problem:

1) Does it has to be 170?  If not then you can slow it down by letting it count to e.g. 17000.

2) Change it to something like this:

Code: [Select]

if (up)
{
    if (Clock.GetElapsedTime() > 25)
    {
        ++Time;
        Clock.Reset();
    }
}
By changing the 25 you can adjust the speed.

[newbie123]

You only reset the clock when up is false, also do this when it is true.


There are two ways I see to fix the problem:

1) Does it has to be 170?  If not then you can slow it down by letting it count to e.g. 17000.

2) Change it to something like this:

Code: [Select]

if (up)
{
    if (Clock.GetElapsedTime() > 25)
    {
        ++Time;
        Clock.Reset();
    }
}
By changing the 25 you can adjust the speed.

if i reset clock when its false and true the time variable will stay at 0 and will not increment.

1) yes it has to be 170 because I'm changing the transparency of an image using time. I'm creating a darkness / night effect.

2) i can't do it this way because the program will wait 25 second till it start incrementing time.

what i want to do is increment "time" every second till it reach 170 and then decrement it till it reach 0 and so on, to create my night effect.

[texus]

I tested the following code with SFML2 and it should work.
I think that if u are using SFML 1.6 that you should change the 1000 into a 1.

Code: [Select]

while(Window.IsOpened())
{
    if( up )
    {
        if (Clock.GetElapsedTime() >= 1000)
        {
            ++Time;
            Clock.Reset();
        }
    }
    else
    {
        if (Clock.GetElapsedTime() >= 1000)
        {
            --Time;
            Clock.Reset();
        }
    }

    if( Time >= 170 )
        up = false;

    if( Time <= 0 )
        up = true;
           
}

[newbie123]

I tested the following code with SFML2 and it should work.
I think that if u are using SFML 1.6 that you should change the 1000 into a 1.

Code: [Select]

while(Window.IsOpened())
{
    if( up )
    {
        if (Clock.GetElapsedTime() >= 1000)
        {
            ++Time;
            Clock.Reset();
        }
    }
    else
    {
        if (Clock.GetElapsedTime() >= 1000)
        {
            --Time;
            Clock.Reset();
        }
    }

    if( Time >= 170 )
        up = false;

    if( Time <= 0 )
        up = true;
           
}

wow thank you so very much its working perfectly.
but i could sworn that i have tried this way before posting and it didn't work. hmmm...

anyways thank you very much it working like a charm.