Charge-dependent gravity

double C_TFCompoundBow::GetProjectileGravity()
{
    double charge = (float)this->GetCurrentCharge();
    if (charge > 0)
    {
        if (charge <= 1.0)
            return (charge * -0.4 + 0.5);
        else
            return 0.01;
    }
    else
        return 0.5;
}