Home | Demos | Products
At run time, the SCADA Viewer loads the drawings, queries the list of data tags defined in each drawing and updates the drawings from the datasources specified by the end user in the data tags.
A configuration file is used to define a set of drawings to be displayed. On start-up, the Viewer reads the configuration file and initializes the navigation menu based on the information provided in the configuration file. A new drawing can be added to the Viewer by simply adding its filename to the configuration file. Alternatively, a list of available drawings can be queried from the server.
A page navigation menu is implemented as part of the GLG drawing. Alternatively, a navigation menu can be implemented using HTML buttons (as shown in the mobile version of the Viewer), or using an HTML list.
The Viewer uses a similar generic approach for defining popup dialogs to implement drill-down functionality. All information about the popup dialogs is defined in the drawing: a new popup dialog may be added by editing the drawing and without any changes to the source code of the Viewer.
The demo also demonstrates the use of an integrated zooming and panning API. By default, it zooms and pans the drawing displayed in its viewing area. However, when the Real-Time Strip-Chart is activated by a corresponding button, the same code zooms and scrolls the data displayed in the strip chart.
The demo uses simulated data. However, provided with a data source in a real application, it will display live data.