Struct OpacityTransferFunction 

pub struct OpacityTransferFunction { /* private fields */ }

A piecewise-linear opacity transfer function.

Maps a scalar value to an opacity in [0.0, 1.0]. Control points are stored sorted by scalar value.

VTK Equivalent

vtkPiecewiseFunction used as vtkVolumeProperty::ScalarOpacity.

Implementations

impl OpacityTransferFunction

pub fn new() -> Self

Create an empty opacity function.

pub fn linear_ramp(scalar_min: f64, scalar_max: f64) -> Self

Create a linear ramp: fully transparent at scalar_min, fully opaque at scalar_max.

pub fn add_point(&mut self, scalar: f64, opacity: f64)

Add or replace a control point.

opacity is clamped to [0, 1].

pub fn remove_point(&mut self, scalar: f64, epsilon: f64)

Remove a control point within epsilon of scalar.

pub fn evaluate(&self, scalar: f64) -> f64

Evaluate opacity at scalar. Returns 0.0 if no points exist.

pub fn len(&self) -> usize

Number of control points.

pub fn is_empty(&self) -> bool

true if no control points have been added.

Trait Implementations

impl Clone for OpacityTransferFunction

fn clone(&self) -> OpacityTransferFunction

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for OpacityTransferFunction

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

Formats the value using the given formatter.

impl Default for OpacityTransferFunction

fn default() -> Self

Returns the “default value” for a type.