Enum NumericExpression 

pub enum NumericExpression {
    Literal(f64),
    Zoom,
    Pitch,
    GetProperty {
        key: String,
        fallback: f64,
    },
    GetState {
        key: String,
        fallback: f64,
    },
    Add(Box<NumericExpression>, Box<NumericExpression>),
    Sub(Box<NumericExpression>, Box<NumericExpression>),
    Mul(Box<NumericExpression>, Box<NumericExpression>),
    Div(Box<NumericExpression>, Box<NumericExpression>),
    Mod(Box<NumericExpression>, Box<NumericExpression>),
    Pow(Box<NumericExpression>, Box<NumericExpression>),
    Abs(Box<NumericExpression>),
    Ln(Box<NumericExpression>),
    Sqrt(Box<NumericExpression>),
    Min(Box<NumericExpression>, Box<NumericExpression>),
    Max(Box<NumericExpression>, Box<NumericExpression>),
}

A numeric expression that evaluates to f64.

Used as the input for Interpolate and Step expressions, and as operands for arithmetic and comparison operations.

Variants

Literal(f64)

A constant numeric literal.

Zoom

The current map zoom level.

Pitch

The current camera pitch in degrees.

GetProperty

Read a numeric feature property.

Fields

key: String

Property key.

fallback: f64

Fallback when absent or non-numeric.

GetState

Read a numeric feature-state value.

Fields

key: String

State key.

fallback: f64

Fallback when absent or non-numeric.

Add(Box<NumericExpression>, Box<NumericExpression>)

Addition: a + b.

Sub(Box<NumericExpression>, Box<NumericExpression>)

Subtraction: a - b.

Mul(Box<NumericExpression>, Box<NumericExpression>)

Multiplication: a * b.

Div(Box<NumericExpression>, Box<NumericExpression>)

Division: a / b (returns 0 on division by zero).

Mod(Box<NumericExpression>, Box<NumericExpression>)

Remainder: a % b.

Pow(Box<NumericExpression>, Box<NumericExpression>)

Exponentiation: a ^ b.

Abs(Box<NumericExpression>)

Absolute value.

Ln(Box<NumericExpression>)

Natural logarithm.

Sqrt(Box<NumericExpression>)

Square root.

Min(Box<NumericExpression>, Box<NumericExpression>)

Minimum of two values.

Max(Box<NumericExpression>, Box<NumericExpression>)

Maximum of two values.

Implementations

impl NumericExpression

pub fn eval(&self, ctx: &ExprEvalContext<'_>) -> f64

Evaluate this numeric expression against a context.

Trait Implementations

impl Clone for NumericExpression

fn clone(&self) -> NumericExpression

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for NumericExpression

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

Formats the value using the given formatter.

impl PartialEq for NumericExpression

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl StructuralPartialEq for NumericExpression