Object groups

Drawing objects can be aggregated to groups of objects. Groups can be aggregated with other groups or drawing objects to higher level groups. Groups can be ungrouped later. Grouping information persists even if the grouping mode is inactive.

If the grouping mode is inactive then objects can be selected, deleted or modified without beeing influenced by the group structure.

If the grouping mode is active then the selection of objects is influenced by the group structure in the following way:

• If according to the context only the selection of a single object is reasonable, then the object you clicked on is selected, e.g. you select a line to draw a parallel line.
• If you click on an object e, then all objects are selected which belong to the same groups as e (highest level group and all subgroups). If e is not in a group, then e is selected.
• If you define a selection rectangle, then all objects are selected which are not part of a group, but are within the rectangle, and all objects of those groups where all objects of the highest level group are within the selection rectangle.

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