GLG Real-Time Charts are high-performance components optimized for large datasets and rapid update rates. Any chart may be used as a standalone component or as part of a larger GLG HMI display. Both Strip Charts and XY Scatter Plots are available.

The GLG Real-Time Chart is capable of displaying multiple lines with tens of thousands of data points and updating them with real-time data hundreds of times per second. It can position points at uneven intervals using time stamps and handle invalid or missing data points.

The chart maintains a history buffer and supports integrated zooming and scrolling, which allows to scroll through large datasets of historical data even while the new data points are being added. It can adjust the size of the history buffer on the fly, and erase or show plot lines without losing already plotted data.

The chart also supports multiple Y axes, point tooltips, cross-hair cursor feedback and point selection with the mouse, as shown in the online demo. Chart features include custom label formatters, grid and level lines, configurable minor and major tick intervals, integrated legends and many other features.

Point and Click Editor and Prototyping

A chart can be customized by editing its properties or resources using the GLG Graphics Builder, a graphical editor with point and click interface.

The Builder can also be used to customize the chart's layout and add chart annotations. Using the Builder, developers can create dashboards containing multiple charts, as well as custom HMI displays with charts, dials, process symbols and other dynamic objects as shown in the demos.

The Builder's Run mode allows you to prototype a chart's behavior with simulated data. The Run mode toolbar includes controls for testing the chart's performance.

The final drawing containing the customized chart is saved into a file which is then used by one of the run-time libraries listed in the Deployment Options section.

For details on editing chart properties, see the Using GLG Real Time Charts chapter in the GLG Builder and Animation Tutorial.

Deployment Options

GLG Real-Time Charts can be used in an application via one of the following GLG API libraries:

• C/C++ libraries for Linux/Unix and Windows platforms,
  32 and 64 bit, Qt and Gnome widget wrappers are included

• C# / .NET Class Library

• Java Class Library

• JavaScript / React / Angular / Next.js Library for Web / Mobile deployment

• GLG Graphics Server for an alternative server-side Web deployment with ASP.NET or JSP

• ActiveX (Windows platforms)

A developer uses a run-time API to develop an application that loads the chart's drawing and supplies real-time data for the chart. An application can obtain data using any custom data acquisition mechanism; the data is then pushed into the chart using the GLG API calls. The application can also dynamically configure the chart via resources at run time.

Coding Examples

Coding examples of using Real-Time Chart in an application:

• C
• C++
• C#
• Java
• JavaScript

Pricing

The GLG Real-Time Charts Package includes the Real-Time Charts widget set, a Limited Edition of the Graphics Builder and a selected deployment option (C/C++/C#, Java, JavaScript / React / Angular / Next.js, etc.). The charts are royalty-free.

The Basic Edition of the Graphics Builder can be purchased to create dashboards containing multiple charts and other widgets.

› Details of the GLG Widgets Package