Struct Sparkline 

pub struct Sparkline<'a> { /* private fields */ }

A compact sparkline widget for trend visualization.

Sparklines display a series of values as a row of Unicode block characters, with height proportional to value. Useful for showing trends in dashboards, status bars, and data-dense UIs.

Features

• Auto-scaling: Automatically determines min/max from data if not specified
• Manual bounds: Set explicit min/max for consistent scaling across multiple sparklines
• Color gradient: Optional start/end colors for value-based coloring
• Baseline: Optional baseline value (default 0.0) for distinguishing positive/negative

Block Characters

Uses 9 levels of height: empty space plus 8 bar heights (▁▂▃▄▅▆▇█)

Implementations

impl<'a> Sparkline<'a>

pub fn new(data: &'a [f64]) -> Self

Create a new sparkline from data slice.

pub fn min(self, min: f64) -> Self

Set explicit minimum value for scaling.

If not set, minimum is auto-detected from data.

pub fn max(self, max: f64) -> Self

Set explicit maximum value for scaling.

If not set, maximum is auto-detected from data.

pub fn bounds(self, min: f64, max: f64) -> Self

Set min and max bounds together.

pub fn style(self, style: Style) -> Self

Set the base style (foreground color, etc.).

pub fn gradient(self, low_color: PackedRgba, high_color: PackedRgba) -> Self

Set a color gradient from low to high values.

Low values get low_color, high values get high_color, with linear interpolation between.

pub fn baseline(self, baseline: f64) -> Self

Set the baseline value.

Values at or below baseline show as empty space. Default is 0.0.

pub fn render_to_string(&self) -> String

Render the sparkline as a string (for testing/debugging).

Trait Implementations

impl<'a> Clone for Sparkline<'a>

fn clone(&self) -> Sparkline<'a>

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<'a> Debug for Sparkline<'a>

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

Formats the value using the given formatter.

impl Default for Sparkline<'_>

fn default() -> Self

Returns the “default value” for a type.

impl MeasurableWidget for Sparkline<'_>

fn measure(&self, _available: Size) -> SizeConstraints

Measure the widget given available space.

fn has_intrinsic_size(&self) -> bool

Quick check: does this widget have content-dependent sizing?

impl Widget for Sparkline<'_>

fn render(&self, area: Rect, frame: &mut Frame<'_>)

Render the widget into the frame at the given area.

fn is_essential(&self) -> bool

Whether this widget is essential and should always render.