Hey!

So I've been working on a health bar which shrinks and grows according to how much health your character has.

The problem is I don't know how to add a smooth increment to health regen.

Say if I want to gain 600 life over 4 seconds, how would I go about achieving this? Will I have to use float numbers, and in what way? The health bar checks how many pixels the bar should shrink and grow depending on the health value.

This is my code right now.

CHealthBart.cpp

void CHealthBar::OnRender(SDL_Surface* _destination)
{

	SDL_FillRect(_destination, &BarBackground, SDL_MapRGB(_destination->format, 0, 0, 0));

	if( (float)Owner->GetCurrentHealth() / Owner->GetMaxHealth() > 0.6f )
	{
		SDL_FillRect(_destination, &Bar, SDL_MapRGB(_destination->format, HighHealth.r, HighHealth.g, HighHealth.b));
	}
	if ( (float)Owner->GetCurrentHealth() / Owner->GetMaxHealth() <= 0.6f && Owner->GetCurrentHealth() / Owner->GetMaxHealth() < 0.25f )
	{
		SDL_FillRect(_destination, &Bar, SDL_MapRGB(_destination->format, AverageHealth.r, AverageHealth.g, AverageHealth.b)); 
	}
	if( (float)Owner->GetCurrentHealth() / Owner->GetMaxHealth() <= 0.25f)
	{
		SDL_FillRect(_destination, &Bar, SDL_MapRGB(_destination->format, LowHealth.r, LowHealth.g, LowHealth.b)); 
	}
	
}

void CHealthBar::OnLoop()
{

	BarBackground.x = Owner->GetX();
	BarBackground.y = ( Owner->GetY() - 5 ); 

	Bar.x = ( Owner->GetX() + 1 );
	Bar.y = ( Owner->GetY() - 4 );

	float tempw = (float)Owner->GetCurrentHealth() / Owner->GetMaxHealth();
	Bar.w = MaxBarLength * tempw;

}

Would be great if someone could give a good answer on this.

void Owner::AddRegen( float fValue, float fDuration )
{
  m_fRegenValue += fValue;
  m_fRegenDuration = fDuration;
}

void Owner::Update( float fDeltaTime )
{
  if( m_fRegenValue > 0.0f && m_fRegenDuration > 0.0f )
  {
    float fDeltaRegen = min( fDeltaTime, m_fRegenDuration );

    m_fHealth += m_fRegenValue * fDeltaRegen;
    if( m_fHealth > m_fHealthMax )
      m_fHealth = m_fHealthMax;

    m_fRegenDuration -= fDeltaRegen;
  }
}

Thank you all for your input. I finally with your help got it working. :)

With computers today it's probably faster to use floating-point than do all the shifting required for fixed-point numbers.

Just be aware that you can never use == or != with floating-point numbers as they are always imprecise by a little bit.

I did change my health and regen to float instead of int. :)