Question about buff duration - Durationformula

[drmario]

Hi folks,

I have been trying to determine what is actually behind the "Durationformula" for spells to calculate the duration for levels 1-65. For some spells, it's pretty simple, for example:

- Ensnare: Buff Duration: 140 (14.0 minutes), Durationformula: "Level * 2 + 10" (durationformula 9).

With the above it's simple to figure out the spell duration for Ensnare at any character level.

However, with this spell, as an example:

- Snare: Buff Duration: 39 (3.9 minutes), Durationformula: "Duration * 3/5" (durationformula 2).

It's not easy (well, for me) to use this Durationformula and others to calculate duration by level.

I was hoping someone could shed some light into what "Duration * 3/5", "Duration / 2" etc. actually mean for determining the duration for the spells with those formulas at say, level 14, or whatever.

Thanks in advance.

[NatedogEZ]

// the generic formula calculations
int CalcBuffDuration_formula(int level, int formula, int duration)
{
int i; // temp variable

switch(formula)
{
case 0: // not a buff
return 0;

case 1:
i = (int)ceil(level / 2.0f);
return i < duration ? (i < 1 ? 1 : i) : duration;

case 2:
i = (int)ceil(duration / 5.0f * 3);
return i < duration ? (i < 1 ? 1 : i) : duration;

case 3:
i = level * 30;
return i < duration ? (i < 1 ? 1 : i) : duration;

case 4: // only used by 'LowerElement'
return ((duration != 0) ? duration : 50);

case 5:
i = duration;
// 0 value results in a 3 tick spell, else its between 1-3 ticks.
return i < 3 ? (i < 1 ? 3 : i) : 3;

case 6:
i = (int)ceil(level / 2.0f);
return i < duration ? (i < 1 ? 1 : i) : duration;

case 7:
i = level;
return (duration == 0) ? (i < 1 ? 1 : i) : duration;

case 8:
i = level + 10;
return i < duration ? (i < 1 ? 1 : i) : duration;

case 9:
i = level * 2 + 10;
return i < duration ? (i < 1 ? 1 : i) : duration;

case 10:
i = level * 3 + 10;
return i < duration ? (i < 1 ? 1 : i) : duration;

case 11:
return duration;

case 12:
return duration;

case 15: // Don't know what the real formula for this should be. Used by Skinspikes potion.
return duration;

case 50: // lucy says this is unlimited?
return 72000; // 5 days

case 3600:
return duration ? duration : 3600;

default:
LogFile->write(EQEMuLog::Debug, "CalcBuffDuration_formula: unknown formula %d", formula);
return 0;
}
}




Heres the code if you think the math will better explain it :p

[drmario]

Heres the code if you think the math will better explain it :p

That could work, thank you!

[NatedogEZ]

Also take note... the duration it returns is in "ticks" of 6 seconds

so if it returns a duration of 60 -- that is 6 minutes :)

[drmario]

Also take note... the duration it returns is in "ticks" of 6 seconds

so if it returns a duration of 60 -- that is 6 minutes :)

I took a look at the full spells.cpp just now and that's pretty well explained too

However case 2:
i = (int)ceil(duration / 5.0f * 3);
return i < duration ? (i < 1 ? 1 : i) : duration;

is still mystifying to me. How is character level taken into account here for these spells including the druid level 1 Snare that clearly scales with level? O_o

It takes the duration, which default for Snare is "39", divides it by a float 5.0 * 3, rounds it to the nearest int, and that is supposed to = duration. What?

[NatedogEZ]

The formula looks incorrect.. its supposed to scale with level.. but it does not :p

[NatedogEZ]

Pretty sure case 2: should be this.... (going from what is posted on Lucy for spells that have that formula ID)



i = (int)ceil(level * 0.6f);
return i < duration ? (i < 1 ? 1 : i) : duration;



http://lucy.allakhazam.com/spell.html?id=242&source=Live


At level 1 -- it returns 1 tick
at level 65 it returns 39 ticks (or MAX duration)


formula works with this spell too ... so it seems to be right on :)

http://lucy.allakhazam.com/spell.html?id=12897&source=Live

[drmario]

Pretty sure case 2: should be this.... (going from what is posted on Lucy for spells that have that formula ID)



i = (int)ceil(level * 0.6f);
return i < duration ? (i < 1 ? 1 : i) : duration;



http://lucy.allakhazam.com/spell.html?id=242&source=Live


At level 1 -- it returns 1 tick
at level 65 it returns 39 ticks (or MAX duration)


Works for me. Thanks again! :)