Candles and bars

Use OHLC when the open, high, low and close within each interval matter. The series overview explains how to add, update, hide and remove a series; the input table covers every renderer.

Data

Bar::new(time, open, high, low, close, volume) stores one interval at its UTC open time. High must be at least the open and close; low must be at most both. Volume must be finite and nonnegative; use zero if unavailable. For example, (100, 105, 98, 103, 800) has a body from 100 to 103, a wick from 98 to 105 and rising colour under the default open/close rule.

ChartType offers Candles, Bars, HollowCandles, VolumeCandles and HighLow. Bars draw an open tick on the left and a close tick on the right. Hollow candles are hollow when close is above open. Volume candles scale body width against the largest visible bar volume; zero volume gives a body as thin as the wick. High-low draws the interval’s range.

Style and running result

This scene uses the fixed history from your first chart. Its candles use close versus previous close for direction. Pan, zoom and inspect the bars; the input history stays the same.

Candles coloured by previous closeOpen full size

Inspect candle bodies and wicks across the synthetic one-minute history.

The interactive example needs JavaScript and WebAssembly. You can still use the chart setup alongside it.

series_candles.rs

use egui_charts::Chart;

pub fn candles() -> Chart {
    use egui_charts::ChartType;
    let mut chart = crate::first_chart::first_chart();
    chart.set_chart_type(ChartType::Candles);
    let mut params = chart.chart_type_params().clone();
    params.styles.candles.wick_visible = true;
    params.styles.candles.color_by_previous_close = true;
    chart.set_chart_type_params(params);
    chart
}

The compiled setup is in series.rs. ChartTypeStyles::candles holds CandlesStyle: body visibility, wick visibility and colouring by previous close. BarsStyle controls the open tick and thin bars. Apply these through Chart::set_chart_type_params.

Main-series colours, wick width and candle border width live in ChartConfig. BarColors can override a bar’s body, wick and border. Added OHLC series use SeriesOptions::up_color and down_color; they do not expose the main series’ candle/bar style switches. All five types can be added series.

For smoothed OHLC, continue to Heikin-Ashi.