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How stats order working

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How stats order working

Posted: Fri Nov 21, 2014 9:55 pm
by Zealar
"Order" allow us to change basic math operation order.

"Add" == "Addition" == +
"Mul" == "Multiplication" == *

For example if we got :

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Base stat : (10)Add (+30)Mul (* 30)
In normal math mul is before add so will got follow:

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10 * 30 + 30 = 330
But if we use order "2" for (*30) and order "1" for (+30) then will get.

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(10 + 30 ) * 30 = 1200
In other words we tell to calculator to calculate "Add" before "Mul".

For see example how orders can be used in L2J and what effect they will have lets do some calculations with characters Critical Rate (Crit. Rate).

Before we look in formulas and order need to understand what is DEX bonus and how to see proper value.

See file game\data\stats\statBonus.xml

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     <DEX>        <!-- 1.009^(DEX-19.360) -->        <stat value="20" bonus="1.01" />        <stat value="21" bonus="1.01" />        <stat value="22" bonus="1.02" />        <stat value="23" bonus="1.03" />        <stat value="24" bonus="1.04" />        <stat value="25" bonus="1.05" />        <stat value="26" bonus="1.06" />        <stat value="27" bonus="1.07" />        <stat value="28" bonus="1.08" />        <stat value="29" bonus="1.09" />    </DEX></list>
Inside we can see Character with 23 DEX got 3% bonus ( * 1.3)

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<stat value="23" bonus="1.03" />
Also need to check default orders for "Mul" and "Add" if they is not changed in DataPack
Mul = 20
Add = 30
Or Mul will be calculate before Add if order is not set to different values in DP.
For see default values for all stats look java.com.l2jserver.gameserver.enums.StatFunction.java

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    ADD("Add", 30),    DIV("Div", 20),    ENCHANT("Enchant", 0),    ENCHANTHP("EnchantHp", 40),    MUL("Mul", 20),    SET("Set", 0),    SHARE("Share", 30),    SUB("Sub", 30);
Lower value mean will be used first.

=======================================
For that example will use:
Class : Maestro
Level : 85
Equip : None

For calculate proper critical rate we need to look inside char template.
game\data\stats\chars\baseStats\Maestro.xml
Look the line

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<baseCritRate>4</baseCritRate>
That "4" is char base critical rate.

Then we need the formula for critical rate so we look inside

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com.l2jserver.gameserver.model.stats.functions.formulas.FuncAtkCritical.java
And we see

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initVal * BaseStats.DEX.calcBonus(effector) * 10
Or "val * dexBonus * 10"

Is time for replace "val" and "dex" bonus.

Maestro got 29 dex what give us 1.09 bonus, and we got 4 base when replace in formula we be

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4 * 1.09 * 10 = 43.6 = 44
Critical Rate

For that example will use 2 skills one give "Add 15 critical (15 static)" and second one give "Mul 1.3 critical(30%)"

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<skill id="22160" name="Vesper Critical Power">    <for>        <effect name="Buff">            <add stat="rCrit" val="15" />        </effect>    </for></skill>

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<skill id="1077" name="Focus">    <for>        <effect name="Buff">            <mul stat="rCrit" val="1.3" />        </effect>    </for></skill>
How formula will be change if use "22160"
FROM

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4 * 1.09 * 10 = 43.6 = 44 // Critical Rate
TO

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(4 * 1.09 * 10) + 15= 58.6 = 59 // Critical Rate
How formula will be change if use "1077"
FROM

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4 * 1.09 * 10 = 43.6 = 44 // Critical Rate
TO

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(4 * 1.09 * 10) * 1.3 = 56.68 = 57 // Critical Rate
How formula will be change if use BOTH
FROM

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4 * 1.09 * 10 = 43.6 = 44 // Critical Rate

TO

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(4 * 1.09 * 10 * 1.3) + 15 = 71.68 = 72 // Critical Rate
Ok now lets play with orders. Add got order 30 by default so is calc last but what will happen if we put it before Mul.
Mul got order 20. So we change skill "22160"
FROM

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<add stat="rCrit" val="15" />
TO

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<add order="19" stat="rCrit" val="15" />
Now that "Add" got lower stat so will be calculate before mul and formula change.
FROM

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(4 * 1.09 * 10 * 1.3) + 15 = 71.68 = 72 // Critical Rate
TO

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((4 * 1.09 * 10 ) + 15) * 1.3 = 76.18 = 76 // Critical Rate
What happen if we got weapon.
For weapon will use "(233) Dark Screamer"
That weapon got

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<set stat="rCrit" val="12" />
That set override the default value so instant of 4 will got 12 so formula is change.
FROM

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4 * 1.09 * 10 = 43.6 = 44 // Critical Rate

TO

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12 * 1.09 * 10 = 130.8 = 131
Lets say we switch weapon to "(4772)Dark Screamer - Focus"
That weapon got "<set stat="rCrit" val="12" />"
But also give skill "3011" and that skill got

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<add stat="rCrit" val="81.2" />
We know need to replace base "4" with set "12" then we look the StatFunction and see where Add is. Add got value 30 so is add last. then formula change to

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(12 * 1.09 * 10) + 81.2 = 212
Q & A
|_______________________________|
Q : In com.l2jserver.gameserver.mode.stats.functions.formulas.* each formula got "Order" called in constructor super for what that is used?
A :
SPOILER:
Basically that order control when formula will be included in calculation.
If we take first example
How formula will be change if use "22160"
FROM

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4 * 1.09 * 10 = 43.6 = 44 // Critical Rate
TO

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(4 * 1.09 * 10) + 15= 58.6 = 59 // Critical Rate
That is when "FuncAtkCritical" get order 1. So formula is called first then other values is add.
In that case we use "Add" to add (+15) that "Add" stat got order 30 what will happen if change order inside "FuncAtkCritical" to 31.
FROM

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(4 * 1.09 * 10) + 15= 58.6 = 59 // Critical Rate
TO

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(4+15) * 1.09 * 10= 58.6 = 207,1 = 207 // Critical Rate
All stats with order under 31 will be perform first then formula will be called. If look code "initValue" will not be called with "4" will use already calculate value.
So really will look like

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19 * 1.09 * 10= 58.6 = 207,1 = 207 // Critical Rate
Q : In com.l2jserver.gameserver.mode.stats.functions.formulas.* Orders used in that formulas effect the other formulas?
For example order inside FuncAtkAccuracy effect in some way FuncAtkCritical?
A : No
Q : Why there is some items what not use default orders and they got custom one like Jewels and Armors
A :
SPOILER:
Lets take again "Maestro" again and see how Pdef and Mdef is calculate.
game\data\stats\chars\baseStats\Maestro.xml

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<basePDef>    <chest>31</chest>    <legs>18</legs>    <head>12</head>    <feet>7</feet>    <gloves>8</gloves>    <underwear>3</underwear>    <cloak>1</cloak></basePDef><baseMDef>    <rear>9</rear>    <lear>9</lear>    <rfinger>5</rfinger>    <lfinger>5</lfinger>    <neck>13</neck></baseMDef>
For example to calculate base Pdef we need to sum all base Pdef so we calculate "chest + legs + head + feet + gloves + underwear + clock" in that case 31 + 18 + 12 + 7 + 8 + 3 + 1.
But we don't keep that values separated and in server start we calculate the sum and put in one variable. Later when we need to calculate base PDef we look used slots and sub value based on item.

Base PDef for Maestro will be 80, then PDef formula is called.
Why is that order 0. That is used to not made new "setGlovesDef", "setChestDef" and other values what will change base Glolves, BaseChest defence when item is used.
Add stats got order 30 so if we not change the order they will be add to late and formula will return bad stats. Using order 0 on them we put that calculation on the begining.

Lets say we put item

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<item id="23" type="Armor" name="Wooden Breastplate">    <for>        <add order="0" stat="pDef" val="47" />    </for></item>
Coz that stat got order 0 is called before formula so we do.
80 + 47 = 127 Base PDef and then we called the PDef formula.
Few lines before calculate the stat is check if "Chest" is used, and see we put that new armor so he remove from that value base chest PDef.
127 - 31 = 96 Base PDef.
For value is used 96.

So basically that is hack to use same value in a lot places (real power of custom orders).
With MDef is the same.

Re: How stats order working

Posted: Fri Nov 28, 2014 6:40 pm
by Zoey76
Moved to FAQ - HOWTO - Guides, thanks.
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