Local extension developers use the method newElement to add or change an editable element in the depictable. There are also methods to query and remove elements, and methods to query the frame and time index of the depictable. Editable Elements Editable elements are on-screen objects visible to the forecaster, which can be moved, reshaped, or deleted. A family of classes related through inheritance represents editable elements. The file EditableElements.
H contains the class declarations for the elements.
Extension developers place editable elements by specifying latitude and longitude, and the D2D software automatically draws them in the correct place in relation to the map background. The Extension Class Extension represents an abstract extension. To make a local extension, a developer derives a new class from class Extension, and overrides the virtual methods as necessary. This class is in the file Extension. Using the Extension Class To emphasize that developers must derive from class Extension, the constructor is protected.