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Using islands and island detection

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 three island-detection methods.

  • Nested Islands The outer entity and all its islands are considered for the polyline.
  • Outer Only Only the outer entity and its outer island are considered for the polyline.
  • Ignore Islands Only the outer entity is considered for the polyline.

Adding hatching

Selecting an area for hatching

Specifying a hatch pattern

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