public static FactorFormula LinearToZeroInRadius(SpotEntity spot)
{
return(p =>
{
double d = spot.GetDistTo(p);
return (d > spot.ServingRadius) ? 0 : spot.Coefficient *(1 - d / spot.ServingRadius);
});
}
public static FactorFormula ExponentialAttenuation(SpotEntity spot)
{
return(p =>
{
double d = spot.GetDistTo(p);
return Math.Pow(spot.Coefficient, 1 - d / spot.ServingRadius);
});
}
public static FactorFormula ZeroOne(SpotEntity spot)
{
return(p =>
{
double d = spot.GetDistTo(p);
return (d > spot.ServingRadius) ? 0 : spot.Coefficient;
});
}
public static FactorFormula InverseSquare(SpotEntity spot, double maxValue = double.MaxValue)
{
return(p =>
{
double d = spot.GetDistTo(p);
double v = spot.Coefficient / d / d;
if (v > 0)
{
return v > maxValue ? maxValue : v;
}
else
{
return v < -maxValue ? -maxValue : v;
}
});
}