Struct ColorLookupTable 

pub struct ColorLookupTable { /* private fields */ }

A pre-computed lookup table for O(1) color lookups.

This table maps a range of values to RGBA colors using a fixed-size array. It is created from a DiscreteColorScale and provides fast color lookups during rendering.

Example

use nexrad_render::{ColorLookupTable, nws_reflectivity_scale};

let scale = nws_reflectivity_scale();
let lut = ColorLookupTable::from_scale(&scale, -32.0, 95.0, 256);

// O(1) lookup returning [R, G, B, A] bytes
let color = lut.color(45.0);

Implementations

impl ColorLookupTable

pub fn from_scale( scale: &DiscreteColorScale, min_value: f32, max_value: f32, size: usize, ) -> Self

Creates a lookup table from a discrete color scale.

Arguments

• scale - The color scale to sample from
• min_value - The minimum value to map
• max_value - The maximum value to map
• size - The number of entries in the lookup table (256 recommended)

Values outside the min/max range will be clamped to the nearest entry.

pub fn from_color_scale( scale: &ColorScale, min_value: f32, max_value: f32, size: usize, ) -> Self

Creates a lookup table from any ColorScale (discrete or continuous).

This is the preferred way to create a LUT for the new rendering entry points.

pub fn color(&self, value: f32) -> [u8; 4]

Returns the RGBA color for the given value.

This is an O(1) operation using direct array indexing.

Trait Implementations

impl Clone for ColorLookupTable

fn clone(&self) -> ColorLookupTable

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ColorLookupTable

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

Formats the value using the given formatter.