mirror of
https://github.com/godotengine/godot.git
synced 2024-12-27 11:24:59 +08:00
259 lines
10 KiB
XML
259 lines
10 KiB
XML
<?xml version="1.0" encoding="UTF-8" ?>
|
|
<class name="float" version="4.0">
|
|
<brief_description>
|
|
Float built-in type.
|
|
</brief_description>
|
|
<description>
|
|
The [float] built-in type is a 64-bit double-precision floating-point number, equivalent to [code]double[/code] in C++. This type has 14 reliable decimal digits of precision. The [float] type can be stored in [Variant], which is the generic type used by the engine. The maximum value of [float] is approximately [code]1.79769e308[/code], and the minimum is approximately [code]-1.79769e308[/code].
|
|
Many methods and properties in the engine use 32-bit single-precision floating-point numbers instead, equivalent to [code]float[/code] in C++, which have 6 reliable decimal digits of precision. For data structures such as [Vector2] and [Vector3], Godot uses 32-bit floating-point numbers by default, but it can be changed to use 64-bit doubles if Godot is compiled with the [code]float=64[/code] option.
|
|
Math done using the [float] type is not guaranteed to be exact or deterministic, and will often result in small errors. You should usually use the [method @GlobalScope.is_equal_approx] and [method @GlobalScope.is_zero_approx] methods instead of [code]==[/code] to compare [float] values for equality.
|
|
</description>
|
|
<tutorials>
|
|
<link title="Wikipedia: Double-precision floating-point format">https://en.wikipedia.org/wiki/Double-precision_floating-point_format</link>
|
|
<link title="Wikipedia: Single-precision floating-point format">https://en.wikipedia.org/wiki/Single-precision_floating-point_format</link>
|
|
</tutorials>
|
|
<methods>
|
|
<method name="float" qualifiers="constructor">
|
|
<return type="float" />
|
|
<description>
|
|
Constructs a default-initialized [float] set to [code]0.0[/code].
|
|
</description>
|
|
</method>
|
|
<method name="float" qualifiers="constructor">
|
|
<return type="float" />
|
|
<argument index="0" name="from" type="float" />
|
|
<description>
|
|
Constructs a [float] as a copy of the given [float].
|
|
</description>
|
|
</method>
|
|
<method name="float" qualifiers="constructor">
|
|
<return type="float" />
|
|
<argument index="0" name="from" type="bool" />
|
|
<description>
|
|
Cast a [bool] value to a floating-point value, [code]float(true)[/code] will be equal to 1.0 and [code]float(false)[/code] will be equal to 0.0.
|
|
</description>
|
|
</method>
|
|
<method name="float" qualifiers="constructor">
|
|
<return type="float" />
|
|
<argument index="0" name="from" type="int" />
|
|
<description>
|
|
Cast an [int] value to a floating-point value, [code]float(1)[/code] will be equal to [code]1.0[/code].
|
|
</description>
|
|
</method>
|
|
<method name="operator !=" qualifiers="operator">
|
|
<return type="bool" />
|
|
<description>
|
|
</description>
|
|
</method>
|
|
<method name="operator !=" qualifiers="operator">
|
|
<return type="bool" />
|
|
<argument index="0" name="right" type="float" />
|
|
<description>
|
|
Returns [code]true[/code] if two floats are different from each other.
|
|
</description>
|
|
</method>
|
|
<method name="operator !=" qualifiers="operator">
|
|
<return type="bool" />
|
|
<argument index="0" name="right" type="int" />
|
|
<description>
|
|
Returns [code]true[/code] if the integer has different value than the float.
|
|
</description>
|
|
</method>
|
|
<method name="operator *" qualifiers="operator">
|
|
<return type="float" />
|
|
<argument index="0" name="right" type="float" />
|
|
<description>
|
|
Multiplies two [float]s.
|
|
</description>
|
|
</method>
|
|
<method name="operator *" qualifiers="operator">
|
|
<return type="Vector2" />
|
|
<argument index="0" name="right" type="Vector2" />
|
|
<description>
|
|
Multiplies each component of the [Vector2] by the given [float].
|
|
[codeblock]
|
|
print(2.5 * Vector2(1, 1)) # Vector2(2.5, 2.5)
|
|
[/codeblock]
|
|
</description>
|
|
</method>
|
|
<method name="operator *" qualifiers="operator">
|
|
<return type="Vector2i" />
|
|
<argument index="0" name="right" type="Vector2i" />
|
|
<description>
|
|
Multiplies each component of the [Vector2i] by the given [float].
|
|
[codeblock]
|
|
print(2.0 * Vector2i(1, 1)) # Vector2i(2.0, 2.0)
|
|
[/codeblock]
|
|
</description>
|
|
</method>
|
|
<method name="operator *" qualifiers="operator">
|
|
<return type="Vector3" />
|
|
<argument index="0" name="right" type="Vector3" />
|
|
<description>
|
|
Multiplies each component of the [Vector3] by the given [float].
|
|
</description>
|
|
</method>
|
|
<method name="operator *" qualifiers="operator">
|
|
<return type="Vector3i" />
|
|
<argument index="0" name="right" type="Vector3i" />
|
|
<description>
|
|
Multiplies each component of the [Vector3i] by the given [float].
|
|
</description>
|
|
</method>
|
|
<method name="operator *" qualifiers="operator">
|
|
<return type="Quaternion" />
|
|
<argument index="0" name="right" type="Quaternion" />
|
|
<description>
|
|
Multiplies each component of the [Quaternion] by the given [float].
|
|
</description>
|
|
</method>
|
|
<method name="operator *" qualifiers="operator">
|
|
<return type="Color" />
|
|
<argument index="0" name="right" type="Color" />
|
|
<description>
|
|
Multiplies each component of the [Color] by the given [float].
|
|
[codeblock]
|
|
print(1.5 * Color(0.5, 0.5, 0.5)) # Color(0.75, 0.75, 0.75)
|
|
[/codeblock]
|
|
</description>
|
|
</method>
|
|
<method name="operator *" qualifiers="operator">
|
|
<return type="float" />
|
|
<argument index="0" name="right" type="int" />
|
|
<description>
|
|
Multiplies a [float] and an [int]. The result is a [float].
|
|
</description>
|
|
</method>
|
|
<method name="operator +" qualifiers="operator">
|
|
<return type="float" />
|
|
<argument index="0" name="right" type="float" />
|
|
<description>
|
|
Adds two floats.
|
|
</description>
|
|
</method>
|
|
<method name="operator +" qualifiers="operator">
|
|
<return type="float" />
|
|
<argument index="0" name="right" type="int" />
|
|
<description>
|
|
Adds a [float] and an [int]. The result is a [float].
|
|
</description>
|
|
</method>
|
|
<method name="operator -" qualifiers="operator">
|
|
<return type="float" />
|
|
<argument index="0" name="right" type="float" />
|
|
<description>
|
|
Subtracts a float from a float.
|
|
</description>
|
|
</method>
|
|
<method name="operator -" qualifiers="operator">
|
|
<return type="float" />
|
|
<argument index="0" name="right" type="int" />
|
|
<description>
|
|
Subtracts an [int] from a [float]. The result is a [float].
|
|
</description>
|
|
</method>
|
|
<method name="operator /" qualifiers="operator">
|
|
<return type="float" />
|
|
<argument index="0" name="right" type="float" />
|
|
<description>
|
|
Divides two floats.
|
|
</description>
|
|
</method>
|
|
<method name="operator /" qualifiers="operator">
|
|
<return type="float" />
|
|
<argument index="0" name="right" type="int" />
|
|
<description>
|
|
Divides a [float] by an [int]. The result is a [float].
|
|
</description>
|
|
</method>
|
|
<method name="operator <" qualifiers="operator">
|
|
<return type="bool" />
|
|
<argument index="0" name="right" type="float" />
|
|
<description>
|
|
Returns [code]true[/code] the left float is less than the right one.
|
|
</description>
|
|
</method>
|
|
<method name="operator <" qualifiers="operator">
|
|
<return type="bool" />
|
|
<argument index="0" name="right" type="int" />
|
|
<description>
|
|
Returns [code]true[/code] if this [float] is less than the given [int].
|
|
</description>
|
|
</method>
|
|
<method name="operator <=" qualifiers="operator">
|
|
<return type="bool" />
|
|
<argument index="0" name="right" type="float" />
|
|
<description>
|
|
Returns [code]true[/code] the left integer is less than or equal to the right one.
|
|
</description>
|
|
</method>
|
|
<method name="operator <=" qualifiers="operator">
|
|
<return type="bool" />
|
|
<argument index="0" name="right" type="int" />
|
|
<description>
|
|
Returns [code]true[/code] if this [float] is less than or equal to the given [int].
|
|
</description>
|
|
</method>
|
|
<method name="operator ==" qualifiers="operator">
|
|
<return type="bool" />
|
|
<description>
|
|
</description>
|
|
</method>
|
|
<method name="operator ==" qualifiers="operator">
|
|
<return type="bool" />
|
|
<argument index="0" name="right" type="float" />
|
|
<description>
|
|
Returns [code]true[/code] if both floats are exactly equal.
|
|
[b]Note:[/b] Due to floating-point precision errors, consider using [method @GlobalScope.is_equal_approx] or [method @GlobalScope.is_zero_approx] instead, which are more reliable.
|
|
</description>
|
|
</method>
|
|
<method name="operator ==" qualifiers="operator">
|
|
<return type="bool" />
|
|
<argument index="0" name="right" type="int" />
|
|
<description>
|
|
Returns [code]true[/code] if the [float] and the given [int] are equal.
|
|
</description>
|
|
</method>
|
|
<method name="operator >" qualifiers="operator">
|
|
<return type="bool" />
|
|
<argument index="0" name="right" type="float" />
|
|
<description>
|
|
Returns [code]true[/code] the left float is greater than the right one.
|
|
</description>
|
|
</method>
|
|
<method name="operator >" qualifiers="operator">
|
|
<return type="bool" />
|
|
<argument index="0" name="right" type="int" />
|
|
<description>
|
|
Returns [code]true[/code] if this [float] is greater than the given [int].
|
|
</description>
|
|
</method>
|
|
<method name="operator >=" qualifiers="operator">
|
|
<return type="bool" />
|
|
<argument index="0" name="right" type="float" />
|
|
<description>
|
|
Returns [code]true[/code] the left float is greater than or equal to the right one.
|
|
</description>
|
|
</method>
|
|
<method name="operator >=" qualifiers="operator">
|
|
<return type="bool" />
|
|
<argument index="0" name="right" type="int" />
|
|
<description>
|
|
Returns [code]true[/code] if this [float] is greater than or equal to the given [int].
|
|
</description>
|
|
</method>
|
|
<method name="operator unary+" qualifiers="operator">
|
|
<return type="float" />
|
|
<description>
|
|
Returns the same value as if the [code]+[/code] was not there. Unary [code]+[/code] does nothing, but sometimes it can make your code more readable.
|
|
</description>
|
|
</method>
|
|
<method name="operator unary-" qualifiers="operator">
|
|
<return type="float" />
|
|
<description>
|
|
Returns the negative value of the [float]. If positive, turns the number negative. If negative, turns the number positive. With floats, the number zero can be either positive or negative.
|
|
</description>
|
|
</method>
|
|
</methods>
|
|
</class>
|