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Added float version of GetRandomWeightedEntry

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Ell 2022-02-23 14:35:35 +01:00
parent c360c90f28
commit af7c341d83
2 changed files with 14 additions and 0 deletions
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1
CHANGELOG.md
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@ -18,6 +18,7 @@ Additions
Improvements
- Generify GenericFont's string drawing
- Added InputHandler mouse and touch position querying that preserves the game's viewport
- Added float version of GetRandomWeightedEntry
Fixes
- **Fixed a formatting Code only knowing about the last Token that it is applied in**

13
MLEM/Extensions/RandomExtensions.cs
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@ -41,5 +41,18 @@ namespace MLEM.Extensions {
throw new IndexOutOfRangeException();
}
/// <inheritdoc cref="GetRandomWeightedEntry{T}(System.Random,System.Collections.Generic.IList{T},System.Func{T,int})"/>
public static T GetRandomWeightedEntry<T>(this Random random, IList<T> entries, Func<T, float> weightFunc) {
var totalWeight = entries.Sum(weightFunc);
var goalWeight = random.NextDouble() * totalWeight;
var currWeight = 0F;
foreach (var entry in entries) {
currWeight += weightFunc(entry);
if (currWeight >= goalWeight)
return entry;
}
throw new IndexOutOfRangeException();
}
}
}