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Diffstat (limited to 'doc/classes/float.xml')
| -rw-r--r-- | doc/classes/float.xml | 243 |
1 files changed, 112 insertions, 131 deletions
diff --git a/doc/classes/float.xml b/doc/classes/float.xml index 85fe31eec8..4bf04fe25f 100644 --- a/doc/classes/float.xml +++ b/doc/classes/float.xml @@ -4,263 +4,244 @@ Float built-in type. </brief_description> <description> - Float built-in type. + 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"> - </return> + <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"> - </return> - <argument index="0" name="from" type="float"> - </argument> + <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"> - </return> - <argument index="0" name="from" type="bool"> - </argument> + <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"> - </return> - <argument index="0" name="from" type="int"> - </argument> + <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"> - </return> - <argument index="0" name="right" type="float"> - </argument> + <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"> - </return> - <argument index="0" name="right" type="int"> - </argument> + <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"> - </return> - <argument index="0" name="right" type="float"> - </argument> + <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"> - </return> - <argument index="0" name="right" type="Vector2"> - </argument> + <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"> - </return> - <argument index="0" name="right" type="Vector2i"> - </argument> + <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"> - </return> - <argument index="0" name="right" type="Vector3"> - </argument> + <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"> - </return> - <argument index="0" name="right" type="Vector3i"> - </argument> + <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="Quat"> - </return> - <argument index="0" name="right" type="Quat"> - </argument> + <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"> - </return> - <argument index="0" name="right" type="Color"> - </argument> + <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"> - </return> - <argument index="0" name="right" type="int"> - </argument> - <description> - </description> - </method> - <method name="operator +" qualifiers="operator"> - <return type="float"> - </return> + <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"> - </return> - <argument index="0" name="right" type="float"> - </argument> + <return type="float" /> + <argument index="0" name="right" type="float" /> <description> + Adds two floats. </description> </method> <method name="operator +" qualifiers="operator"> - <return type="float"> - </return> - <argument index="0" name="right" type="int"> - </argument> + <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"> - </return> + <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"> - </return> - <argument index="0" name="right" type="float"> - </argument> - <description> - </description> - </method> - <method name="operator -" qualifiers="operator"> - <return type="float"> - </return> - <argument index="0" name="right" type="int"> - </argument> + <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"> - </return> - <argument index="0" name="right" type="float"> - </argument> + <return type="float" /> + <argument index="0" name="right" type="float" /> <description> + Divides two floats. </description> </method> <method name="operator /" qualifiers="operator"> - <return type="float"> - </return> - <argument index="0" name="right" type="int"> - </argument> + <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"> - </return> - <argument index="0" name="right" type="float"> - </argument> + <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"> - </return> - <argument index="0" name="right" type="int"> - </argument> + <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"> - </return> - <argument index="0" name="right" type="float"> - </argument> + <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"> - </return> - <argument index="0" name="right" type="int"> - </argument> + <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"> - </return> - <argument index="0" name="right" type="float"> - </argument> + <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"> - </return> - <argument index="0" name="right" type="int"> - </argument> + <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"> - </return> - <argument index="0" name="right" type="float"> - </argument> + <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"> - </return> - <argument index="0" name="right" type="int"> - </argument> + <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"> - </return> - <argument index="0" name="right" type="float"> - </argument> + <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"> - </return> - <argument index="0" name="right" type="int"> - </argument> + <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> |