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Islands are closed loops that reside inside other closed loops. progeCAD provides island-detection options so that you can specify which islands, if any, should be considered in the area selection for a boundary.
The following figure shows a rectangular polyline with two islands. The circle is referred to as the outer island, and the octagon is referred to as a nested island.
Rectangular polyline ( A ) with outer island ( B ), with point ( C ) specifying the area selection, and nested island ( D ). |
You can choose from two island-detection methods.
Nested Islands The outer entity and all its islands are considered for the polyline.
Nested islands ( A ) and with ignore islands ( B ). |
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