Scripts / What is "ai_old_health[e]"?

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Moshroom
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Posted: 29th Sep 2015 14:52
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The total lack of any useful comments in the default lua files has caused me frustration more than once, but usually I have eventually managed to guess what the GameGuru's LUA commands and variables/tables are supposed to do. But this time I'm clueless. In the ai_fantasy character script there is this (lines 122 - 125):

I have no idea of the meaning of these lines except that in the end it plays sound. Could somebody be kind to explain me what information does the "ai_old_health" table contain?
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smallg
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Posted: 29th Sep 2015 15:29
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Quote: "ai_old_health[e] = g_Entity[e]['health']"

it holds the health and basically tells the character to play a sound whenever he takes damage
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DVader
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Posted: 29th Sep 2015 16:49
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AI_Old_Health, the clue is in the array name. When you take damage, as smallg points out above, your health reduces. Oldhealth is updated to reflect this. You need old health, so you can check how much damage you have received or if you were hit and other such things by comparing the two.


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Bored of the Rings
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Posted: 29th Sep 2015 20:37
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As smallg says its the original or previous health value
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Moshroom
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Posted: 1st Oct 2015 07:42
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Thanks everyone. Now that you said it, it seems completely logical. In other words, ai_old_health[e] is just a table that is used to store data that's pulled from the engine by another command. I still don't understand why the table is defined this way:

Is there some reason to initiate it with placeholder value -1 instead of just letting it be nil until used? For example:
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smallg
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Posted: 1st Oct 2015 09:17
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Nope, that's just how they've chosen to do it
life\'s one big game

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DVader
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Posted: 1st Oct 2015 17:10
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Using a -1 flag is just one method of using flags that should never check for less than zero. It's fairly common practise to use -1 to switch a flag off so 0 and 1 or more can be used. Just one of many ways to do the same thing


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