hydroxy

Bar race chart

A ranking played through time: the top entries as bars that grow and glide past each other as the order changes, with play, pause and a scrubber.

Monthly active users by city

The top eight cities each quarter, in thousands. Press play, or drag to scrub.

Q1 2022: 1. London 182k, 2. Paris 140k, 3. Berlin 121k
Monthly active users by city, 2022 to 2024
Q1 2022Q2 2022Q3 2022Q4 2022Q1 2023Q2 2023Q3 2023Q4 2023Q1 2024Q2 2024Q3 2024Q4 2024
London182k189k197k205k213k221k230k239k249k259k269k280k
Berlin121k132k144k157k171k186k203k221k241k263k286k312k
Paris140k148k157k167k177k187k199k211k223k237k251k266k
Madrid64k72k80k90k101k113k126k141k158k177k199k223k
Amsterdam88k94k101k108k115k123k132k141k151k162k173k185k
Lisbon22k27k34k42k52k64k80k99k123k152k189k234k
Dublin51k55k59k64k69k75k81k87k94k102k110k119k
Stockholm47k52k57k63k69k76k83k92k101k111k122k134k
Warsaw18k23k29k36k45k57k72k91k114k144k182k229k
Milan70k74k77k81k85k89k94k98k103k109k114k120k
Prague29k33k38k44k51k58k67k77k89k102k117k135k
Vienna39k43k46k51k55k60k65k71k78k85k92k101k

Usage

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

#[component]
pub fn Demo() -> impl IntoView {
    let quarters: Vec<String> = (2022..=2024).flat_map(|y| (1..=4).map(move |q| format!("Q{q} {y}"))).collect();
    // Monthly active users in thousands: each city starts somewhere and grows at its own pace.
    let grow = |start: f64, rate: f64| (0..12).map(|q| (start * rate.powi(q)).round()).collect::<Vec<f64>>();
    let cities = vec![
        Series::new("London", grow(182.0, 1.04)),
        Series::new("Berlin", grow(121.0, 1.09)),
        Series::new("Paris", grow(140.0, 1.06)),
        Series::new("Madrid", grow(64.0, 1.12)),
        Series::new("Amsterdam", grow(88.0, 1.07)),
        Series::new("Lisbon", grow(22.0, 1.24)),
        Series::new("Dublin", grow(51.0, 1.08)),
        Series::new("Stockholm", grow(47.0, 1.10)),
        Series::new("Warsaw", grow(18.0, 1.26)),
        Series::new("Milan", grow(70.0, 1.05)),
        Series::new("Prague", grow(29.0, 1.15)),
        Series::new("Vienna", grow(39.0, 1.09)),
    ];

    view! {
        <ChartFrame title="Monthly active users by city" description="The top eight cities each quarter, in thousands. Press play, or drag to scrub.">
            <BarRaceChart frames=quarters series=cities label="Monthly active users by city, 2022 to 2024" top=8 format=|v: f64| format!("{v:.0}k") />
        </ChartFrame>
    }
}

Anatomy

Componentdata-partRenders
BarRaceChartrootfigure with a screen-reader table of every value in every frame; data-playing while it runs
rowOne entry: name, bar and value, placed by rank; data-out when outside the top
barBar length, as a share of the leader's value
valueThe value, counting as the race plays
frameThe current frame, large in the corner
playPlay or pause button
scrubberRange input over the frames

Keyboard

KeyDoes
Space / EnterPlay or pause (on the button)
ArrowLeft / ArrowRightPrevious or next frame (on the scrubber)
Home / EndFirst or last frame (on the scrubber)

Props

PropTypeNotes
framesVec<String>Required. One label per frame
seriesVec<Series>Required. Series::new(name, one value per frame)
labelStringRequired. What the chart shows; the accessible name
topusizeBars shown at once. Default 10
frame_msu32How long each frame lasts while playing. Default 1200
autoplayboolStart once mounted; never under reduced motion
row_heightu16Row height in px. Default 30
formatFn(f64) -> StringFormats values, ticks and table

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
frameSignal<usize>Controlled frame index. Uncontrolled when left off
on_frame_changeCallback<usize>Called when the shown frame changes
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