In the selection menu on the left of Grappa’s main window all Alida operators found in the classpath upon initialization are listed as potential nodes for Grappa workflows.
The operator nodes are arranged in a hierarchical ordering according to their package structure. The different package subtrees can be folded and unfolded by double- clicking on a folder’s name in the selection tree, or by single-clicking on the circle displayed left to the folder icon.
Above the tree view an operator filter is available which allows to select operators according to their names. For filtering, enter a substring into the text field and press the return key.
Operator nodes can be added to a workflow by double-clicking on the operator name. A new operator node is then instantiated in the top left corner of the active workflow tab. Alternatively, an operator can be selected by clicking once on its name and afterwards clicking once on the position in the workflow tab where the new operator node should be positioned.