Candlestick Chart

A Candlestick chart shows data for the movement of the price of a financial unit. It consists of a bar (the candle), representing the open and close values, and vertical lines, the candlesticks, which illustrate the highest and lowest values.

Candlestick chart. Results from the first code snippet below

This article assumes you are familiar with the chart basics and data binding.

To create a candlestick chart:

  1. add a ChartSeries to the ChartSeriesItems collection
  2. set its Type property to ChartSeriesType.Candlestick
  3. provide a data collection to its Data property and set the corresponding fields:
    • CategoryField - the date that will be matched to the x-axis
    • OpenField - the field with the Open value
    • CloseField - the field with the Close value
    • HighField - the field with the High value
    • LowField - the field with the Low value
  4. make the x-axis a Date axis - while the candlestick chart can work with simple string categories, it is designed to show financial data over time

A Candlestick chart that shows product financial stock data

@* Candlestick chart *@

<TelerikChart Height="480px" Width="640px">

    <ChartSeriesItems>
        <ChartSeries Type="@ChartSeriesType.Candlestick"
                     Name="Product 1"
                     Data="@ChartProduct1Data"
                     CategoryField="@(nameof(StockDataPoint.Date))"
                     OpenField="@nameof(StockDataPoint.Open)"
                     CloseField="@nameof(StockDataPoint.Close)"
                     HighField="@nameof(StockDataPoint.High)"
                     LowField="@nameof(StockDataPoint.Low)">
        </ChartSeries>
    </ChartSeriesItems>

    <ChartCategoryAxes>
        <ChartCategoryAxis Type="@ChartCategoryAxisType.Date" BaseUnit="@ChartCategoryAxisBaseUnit.Months">
        </ChartCategoryAxis>
    </ChartCategoryAxes>

    <ChartValueAxes>
        <ChartValueAxis>
            <ChartValueAxisLabels Format="{0:C4}"></ChartValueAxisLabels>
        </ChartValueAxis>
    </ChartValueAxes>

</TelerikChart>

@code {
    List<StockDataPoint> ChartProduct1Data { get; set; }

    protected override async Task OnInitializedAsync()
    {
        await GenerateChartData();
    }

    async Task GenerateChartData()
    {
        ChartProduct1Data = new List<StockDataPoint>()
        {
            new StockDataPoint(new DateTime(2019, 1, 1), 39.88m, 40.12m, 41.12m, 39.75m, 3584700),

            // Close is lower than Open, so the Down color is used, see later in the article for more details
            new StockDataPoint(new DateTime(2019, 2, 1), 41.62m, 40.12m, 41.69m, 39.81m, 2632000),

            new StockDataPoint(new DateTime(2019, 3, 1), 42m, 42.62m, 43.31m, 41.38m, 7631700),
            new StockDataPoint(new DateTime(2019, 4, 1), 42.25m, 43.06m, 43.31m, 41.12m, 4922200),
        };

        await Task.FromResult(ChartProduct1Data);
    }

    public class StockDataPoint
    {
        public StockDataPoint() { }

        public StockDataPoint(DateTime date, decimal open, decimal close, decimal high, decimal low, int volume)
        {
            Date = date;
            Open = open;
            Close = close;
            High = high;
            Low = low;
            Volume = volume;
        }
        public DateTime Date { get; set; }

        public decimal Open { get; set; }

        public decimal Close { get; set; }

        public decimal High { get; set; }

        public decimal Low { get; set; }

        public int Volume { get; set; }
    }
}

Candlestick Chart Specific Appearance Settings

DownColor

Set the color - a valid CSS, RGB, RGBA color - of the series when the OpenField is greater than the CloseField by setting the DownColor property of the ChartSeries. This can be passed throught the data model and bound to the DownColorField.

Color Field

Column, OHLC and Candlestick charts can take the color of the series item from the ColorField of the data source. You can pass a valid CSS color (for example, #abcdef, #f00, or blue).

Gap and Spacing

You can control the distance between the categories that cluster a data point from each series. To do this, use the Gap property of the series. It is the distance between categories expressed as a percentage of the bar width.

To set the distance between the bars of different series in the same category, use the Spacing property. It is the space between the series items in one series category as a proportion of the width of a single series item.

To create overlap, set negative values.

You can configure the values of Gap and Spacing for the whole chart in the first series and they are applied for all categories and series items.

Customize Chart Elements - Nested Tags Settings

When configuring nested properties and child elements in your chart, the inner tags will contain their parent tag name and add specifics to its end. In general the structure of such nested tags will be <Chart*Category**Specifics*> where the Category can be one of the following:

  • SeriesItems
  • CategoryAxes
  • Title
  • Legend
  • ChartXAxes
  • ChartYAxes
  • and others

To customize the chart, look for nested tags and heir properties - the inner tags will contain their parent tag name and add specifics to its end. For example, the ChartSeries tag has a ChartSeriesLabels tag that exposes configuration otions and more child tags.

See Also

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