From Polygon (TopoPolygons from Polygon)

Applicability:

• Cadcorp SIS Map Modeller
• Cadcorp SIS Map Editor
• Cadcorp SIS ActiveX Modeller

Ribbon Group:

Topology-Create TopoPolygons

Associated commands:

• Divide
• From LineString
• From Items
• Cookie Cut

Description:

 From Polygon creates topological TopoPolygon items from a Link and Node item structure using a temporary "spaghetti Polygon". All Polygons in the Link and Node item network which the temporary "spaghetti Polygon" fence overlaps are converted into TopoPolygons. SIS always creates the smallest TopoPolygons it can.

1. Select From Polygon.
   
   
2. Construct a "spaghetti Polygon" fence by putting in points just as you would when creating a polygon item. Click a position on screen which will be one corner of the "spaghetti Polygon". Keep inputting positions to define the other corners (there can be as many as you wish), use the Backspace key to take out the last point input if required - you will see the boundary of the "spaghetti Polygon" rubber banding as you move the cursor.
   
   
3. Press Enter to finish.

The "spaghetti Polygon" fence disappears when the operation is complete.

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