Positive and negative bar

Bars extending above and below the zero baseline. Use it for deltas, profit/loss, variance, and month-over-month movement. The screenshot is captured from the native Fission chart gallery.

What the chart is for

Positive and negative bar belongs to the Cartesian family. Its job is to make this data shape readable: BarSeries values that may be positive or negative. In a production interface, choose this chart when the visual form makes the user's question faster to answer than a table or a simpler chart would.

Avoid it when the visual form makes the user estimate more than necessary; choose the simplest chart that answers the product question.

Data model

BarSeries values that may be positive or negative. Keep the data close to the type that describes it. Fission Charts is typed Rust, so a line uses LineSeries, a calendar heatmap uses CalendarHeatmapSeries, and chart components such as zoom, marks, and graphics are explicit fields on Chart rather than hidden string configuration.

Rust API

Field	Type	Notes
title	&str	Names the chart for the screen, accessibility tree, and test output.
x_axis / y_axis	Axis	Vertical bars use category x/value y; horizontal bars use value x/category y.
series	BarSeries	Holds values plus stack, orientation, radius, background, and color styling.
width / height	f32	Optional fixed size; omit them when the chart should flex inside Fission layout.

Example

use fission_charts::{Axis, BarSeries, Chart};

let chart = Chart::new()
    .title("Category comparison")
    .x_axis(Axis::category(vec!["A", "B", "C", "D"]))
    .y_axis(Axis::value())
    .series(vec![BarSeries::new("Orders").data(vec![120.0, 200.0, 150.0, 80.0]).into()]);

Interaction and animation

Charts can emit typed ChartInteractionEvent values when interaction is enabled. Handle those events in a reducer when the app needs hover, press, release, scroll, selection, or brush behavior. ChartAnimation stores duration, delay, stagger, easing, and reduced-motion behavior as deterministic chart data, so animation timing can be tested instead of being hidden in ad-hoc timers.

Testing guidance

For this chart, test the data mapping first, then test lowering, then capture a live screenshot when visual output changes. The screenshot for this page is refreshed with npm run charts:generate from the website package.

Tags: bar, negative.

Cartesian family overview