hydroxy

Lollipop chart

A lighter bar chart: a thin stick from zero and a dot at each value. Less ink than bars when there are many categories, and it works on a log axis.

Satisfaction by area

Net promoter score from last month's survey.

Net promoter score by product area
Value
Onboarding42
Billing18
Search31
Reporting55
Mobile app12
Integrations37

Monthly downloads

Log scale, so the small packages stay visible.

Monthly downloads by package
Value
Core library412k
Command line tool38k
Editor plugin9k
Migration helper1k
Legacy adapter140

Usage

use hydroxy_leptos::chart_frame::ChartFrame;
use hydroxy_leptos::lollipop_chart::*;
use leptos::prelude::*;

pub fn demo() -> AnyView {
    let nps = vec![
        Datum::new("Onboarding", 42.0),
        Datum::new("Billing", 18.0),
        Datum::new("Search", 31.0),
        Datum::new("Reporting", 55.0),
        Datum::new("Mobile app", 12.0),
        Datum::new("Integrations", 37.0),
    ];
    // Values spanning four orders of magnitude read better on a log axis.
    let downloads = vec![
        Datum::new("Core library", 412_000.0),
        Datum::new("Command line tool", 38_500.0),
        Datum::new("Editor plugin", 9_200.0),
        Datum::new("Migration helper", 1_150.0),
        Datum::new("Legacy adapter", 140.0),
    ];

    view! {
        <div style="display: grid; gap: var(--space-10);">
            <ChartFrame title="Satisfaction by area" description="Net promoter score from last month's survey.">
                <LollipopChart data=nps label="Net promoter score by product area" annotations=vec![Annotation::y_line(30.0, "Goal")] />
            </ChartFrame>
            <ChartFrame title="Monthly downloads" description="Log scale, so the small packages stay visible.">
                <LollipopChart
                    data=downloads
                    label="Monthly downloads by package"
                    orientation=Orientation::Horizontal
                    scale=ScaleKind::Log
                    format=|v: f64| { if v >= 1000.0 { format!("{:.0}k", v / 1000.0) } else { format!("{v:.0}") } }
                />
            </ChartFrame>
        </div>
    }
    .into_any()
}

Anatomy

Componentdata-partRenders
LollipopChartrootfigure with a screen-reader table of every value
stickThin line from the baseline to the value
dotThe value, in the series colour; ringed when active
overlayFocusable plot that drives the tooltip
tooltipThe category and its value
annotationReference lines, bands and points

Keyboard

KeyDoes
ArrowLeft / ArrowRightPrevious or next value (Up/Down when horizontal)
Home / EndFirst or last value
EscapeHide the tooltip

Props

PropTypeNotes
dataVec<Datum>Required. Datum::new(label, value); NaN leaves a gap
labelStringRequired. What the chart shows; the accessible name
orientationOrientationVertical (default) or Horizontal
scaleScaleKindLinear (default), Log or Symlog
heightu16Plot height in px. Default 220
formatFn(f64) -> StringFormats ticks, tooltip and table
annotationsVec<Annotation>Reference lines, bands and points; x is a category index

Events

PropTypeNotes
on_hoverCallback<Option<Datum>>The mark under the pointer or keyboard focus changes, or is left. Fires only on a change
on_selectCallback<Datum>Click, tap or Enter on a mark
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