85 lines
3.3 KiB
XML
85 lines
3.3 KiB
XML
<?xml version="1.0" encoding="UTF-8" ?>
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<class name="RandomNumberGenerator" inherits="Reference" version="3.2">
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<brief_description>
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A class for generating pseudo-random numbers.
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</brief_description>
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<description>
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RandomNumberGenerator is a class for generating pseudo-random numbers. It currently uses [url=http://www.pcg-random.org/]PCG32[/url].
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[b]Note:[/b] The underlying algorithm is an implementation detail. As a result, it should not be depended upon for reproducible random streams across Godot versions.
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To generate a random float number (within a given range) based on a time-dependant seed:
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[codeblock]
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var rng = RandomNumberGenerator.new()
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func _ready():
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rng.randomize()
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var my_random_number = rng.randf_range(-10.0, 10.0)
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[/codeblock]
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</description>
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<tutorials>
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</tutorials>
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<methods>
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<method name="randf">
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<return type="float">
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</return>
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<description>
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Generates a pseudo-random float between [code]0.0[/code] and [code]1.0[/code] (inclusive).
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</description>
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</method>
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<method name="randf_range">
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<return type="float">
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</return>
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<argument index="0" name="from" type="float">
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</argument>
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<argument index="1" name="to" type="float">
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</argument>
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<description>
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Generates a pseudo-random float between [code]from[/code] and [code]to[/code] (inclusive).
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</description>
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</method>
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<method name="randfn">
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<return type="float">
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</return>
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<argument index="0" name="mean" type="float" default="0.0">
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</argument>
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<argument index="1" name="deviation" type="float" default="1.0">
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</argument>
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<description>
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Generates a [url=https://en.wikipedia.org/wiki/Normal_distribution]normally-distributed[/url] pseudo-random number, using Box-Muller transform with the specified [code]mean[/code] and a standard [code]deviation[/code]. This is also called Gaussian distribution.
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</description>
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</method>
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<method name="randi">
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<return type="int">
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</return>
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<description>
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Generates a pseudo-random 32-bit unsigned integer between [code]0[/code] and [code]4294967295[/code] (inclusive).
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</description>
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</method>
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<method name="randi_range">
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<return type="int">
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</return>
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<argument index="0" name="from" type="int">
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</argument>
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<argument index="1" name="to" type="int">
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</argument>
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<description>
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Generates a pseudo-random 32-bit signed integer between [code]from[/code] and [code]to[/code] (inclusive).
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</description>
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</method>
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<method name="randomize">
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<return type="void">
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</return>
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<description>
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Setups a time-based seed to generator.
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</description>
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</method>
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</methods>
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<members>
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<member name="seed" type="int" setter="set_seed" getter="get_seed" default="0">
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The seed used by the random number generator. A given seed will give a reproducible sequence of pseudo-random numbers.
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[b]Note:[/b] The RNG does not have an avalanche effect, and can output similar random streams given similar seeds. Consider using a hash function to improve your seed quality if they're sourced externally.
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[b]Note:[/b] The default value of this property is pseudo-random, and changes when calling [method randomize]. The [code]0[/code] value documented here is a placeholder, and not the actual default seed.
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</member>
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</members>
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<constants>
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</constants>
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</class>
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