Enum BehaviorExpr 

pub enum BehaviorExpr {
    Bool(bool),
    Int(i32),
    Float(f32),
    Vec3([f32; 3]),
    Var(String),
    Local(String),
    Bind(String),
    Named(Option<AssetId>),
    SelfEntity,
    Dt,
    Elapsed,
    Position(Box<BehaviorExpr>),
    Distance(Box<BehaviorExpr>, Box<BehaviorExpr>),
    First(String),
    Count(String),
    Alive(Box<BehaviorExpr>),
    Add(Box<BehaviorExpr>, Box<BehaviorExpr>),
    Sub(Box<BehaviorExpr>, Box<BehaviorExpr>),
    Mul(Box<BehaviorExpr>, Box<BehaviorExpr>),
    Div(Box<BehaviorExpr>, Box<BehaviorExpr>),
    Normalize(Box<BehaviorExpr>),
    Eq(Box<BehaviorExpr>, Box<BehaviorExpr>),
    Ne(Box<BehaviorExpr>, Box<BehaviorExpr>),
    Lt(Box<BehaviorExpr>, Box<BehaviorExpr>),
    Le(Box<BehaviorExpr>, Box<BehaviorExpr>),
    Gt(Box<BehaviorExpr>, Box<BehaviorExpr>),
    Ge(Box<BehaviorExpr>, Box<BehaviorExpr>),
    All(Vec<BehaviorExpr>),
    Any(Vec<BehaviorExpr>),
    Not(Box<BehaviorExpr>),
}

A value expression in a Behavior.

Expressions are pure: they read state, entities, and the clock, and never change the world. Arithmetic works on both scalars and vectors, and mixing the two is a build error.

Variants

Bool(bool)

A boolean literal.

Int(i32)

An integer literal.

Float(f32)

A float literal.

Vec3([f32; 3])

A vector literal.

Var(String)

Reads a world variable.

Local(String)

Reads one of this behavior’s per-entity locals.

Bind(String)

Reads a name bound earlier by a let or for_each node.

Named(Option<AssetId>)

An entity declared in the world, addressed by asset name.

SelfEntity

The entity this behavior instance runs for. Only valid with a scope.

Dt

Seconds elapsed since the previous tick.

Elapsed

Seconds elapsed since the world started.

Position(Box<BehaviorExpr>)

World-space position of an entity.

Distance(Box<BehaviorExpr>, Box<BehaviorExpr>)

Distance between two entities.

First(String)

The first entity of a declared query, or none when it is empty.

Count(String)

How many entities a declared query matched.

Alive(Box<BehaviorExpr>)

Whether an entity is still alive.

Add(Box<BehaviorExpr>, Box<BehaviorExpr>)

Sum of two values.

Sub(Box<BehaviorExpr>, Box<BehaviorExpr>)

Difference of two values.

Mul(Box<BehaviorExpr>, Box<BehaviorExpr>)

Product of two values; a vector may be scaled by a scalar.

Div(Box<BehaviorExpr>, Box<BehaviorExpr>)

Quotient of two values; dividing by zero yields zero.

Normalize(Box<BehaviorExpr>)

A vector rescaled to unit length; a zero vector stays zero.

Eq(Box<BehaviorExpr>, Box<BehaviorExpr>)

Equality test.

Ne(Box<BehaviorExpr>, Box<BehaviorExpr>)

Inequality test.

Lt(Box<BehaviorExpr>, Box<BehaviorExpr>)

Less-than test.

Le(Box<BehaviorExpr>, Box<BehaviorExpr>)

Less-than-or-equal test.

Gt(Box<BehaviorExpr>, Box<BehaviorExpr>)

Greater-than test.

Ge(Box<BehaviorExpr>, Box<BehaviorExpr>)

Greater-than-or-equal test.

All(Vec<BehaviorExpr>)

True when every operand is true.

Any(Vec<BehaviorExpr>)

True when any operand is true.

Not(Box<BehaviorExpr>)

Logical negation.

Trait Implementations

impl Clone for BehaviorExpr

fn clone(&self) -> BehaviorExpr

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for BehaviorExpr

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl Default for BehaviorExpr

fn default() -> BehaviorExpr

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for BehaviorExpr

fn deserialize<__D>( __deserializer: __D, ) -> Result<BehaviorExpr, <__D as Deserializer<'de>>::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl PartialEq for BehaviorExpr

fn eq(&self, other: &BehaviorExpr) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl Serialize for BehaviorExpr

fn serialize<__S>( &self, __serializer: __S, ) -> Result<<__S as Serializer>::Ok, <__S as Serializer>::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for BehaviorExpr