This demo application belongs to the set of examples for LightningChart JS, data visualization library for JavaScript.
LightningChart JS is entirely GPU accelerated and performance optimized charting library for presenting massive amounts of data. It offers an easy way of creating sophisticated and interactive charts and adding them to your website or web application.
The demo can be used as an example or a seed project. Local execution requires the following steps:
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Make sure that relevant version of Node.js is installed
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Open the project folder in a terminal:
npm install # fetches dependencies npm start # builds an application and starts the development server -
The application is available at http://localhost:8080 in your browser, webpack-dev-server provides hot reload functionality.
Also known as a Area Graph, Area Chart or Area Chart with Negative values
The example shows the basic usage of a bipolar area series. The area series is based on line series with the area between the baseline and the given data filled with color. It is drawn on a Cartesian coordinate system and represents the quantitative data.
Current example chart contains one bipolar area series. The data is drawn from both sides of the specified baseline.
The simple area chart can be created with few simple lines of code:
// Create a new ChartXY.
const chart = lightningChart().ChartXY()
// Add an area series with bipolar direction using default X and Y axes.
const areaBipolar = chart.addAreaSeries({
baseline: 0,
type: AreaSeriesTypes.Both,
})The baseline value the type of number and the type can be specified only during the creation of a series instance, where
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The baseline is a fixed reference level of minimum or starting point used for comparisons, which allow customizing the position of the area.
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The type of area series is an enum selector which defines the type of area series:
- Select AreaSeriesTypes.Both to show the data from both sides of the baseline.
The series accepts points in format { x: number, y: number }. Any number of points can be added with a single call.
// Single point.
series.add({ x: 50, y: 60 })
// Multiple points at once.
series.add([
{ x: 55, y: 60 },
{ x: 60, y: 62 },
{ x: 65, y: 65 },
])If you notice an error in the example code, please open an issue on GitHub repository of the entire example.
Official API documentation can be found on LightningChart website.
If the docs and other materials do not solve your problem as well as implementation help is needed, ask on StackOverflow (tagged lightningchart).
If you think you found a bug in the LightningChart JavaScript library, please contact sales@lightningchart.com.
Direct developer email support can be purchased through a Support Plan or by contacting sales@lightningchart.com.
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