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.
Example that showcases LineSeries feature for coloring line dynamically based on X coordinates.
In this example, there is a ECG data set (voltage measurements from a heart over short period of time). This data is visualized as a Line Chart where X dimension represents time and Y dimension measured voltage.
This is a very traditional and well known setting, but this example adds a little twist to it in order to showcase the dynamic X coloring feature.
The example code automatically detects heart beats from the data set and tracks the X coordinate intervals that contain active heart beats.
This heart beat information is then used to prepare a Value - Color lookup table, a conceptually simple object that can be widely used with many different LightningChart JS components.
The lookup table associates a range of Values with corresponding Colors. In this example, this means defining the X value ranges which should be colored "normally" and ranges which should be colored in "highlighted" manner.
Dynamic line coloring is a powerful feature which can serve many different needs. The best thing about it is that it doesn't compromise performance, meaning that you can use it just as well with 100 data points or 100 million data points.
In addition to dynamic coloring by X coordinate there are also more dynamic coloring modes available:
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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