Pitney Bowes MapInfo Professional - Manual (Page 207)

5. Continue until you have traced the entire polygon/polyline and right-click to end.
Autotrace only one object at a time; clicking nodes in different objects will produce a straight line
between the two nodes. Note:
Converting a Polyline to a Region
To convert a polyline into a region:
1. Make the Map window active.
2. Choose Map > Layer Control and click the Editable icon to make the layer editable.
3. Select the polylines you want to convert to a region.
4. On the Objects menu, click Enclose. The Create Region Objects From Enclosed Areas dialog
box displays.
5. Click OK to convert the polyline you selected to a region.
You can also convert regions to polylines. For these instructions, see Converting Regions to Polylines .
Splitting Polylines at Nodes
A single-section polyline can be split into two polylines at a selected node.
To split a single-section polyline:
1. From an editable layer, select a single-section polyline
2. Click the Reshape button from the Drawing tools.
3. Select one node (other than the first or last node).
4. Select the Objects menu, then Polyline Split at Node
5. If a layer is not a cosmetic layer or if the polyline is in the classic Layout window, the Data
Disaggregation dialog box will appear. Here the user can specify how data is disaggregated.
6. After selecting the data disaggregation method, click OK. The selected polyline will be split at the
node into two polylines.
Error messages display under the following conditions:
• You did not select a node of the polyline.
• You selected a beginning or ending node of the polyline.
• You selected more than one node of the polyline.
• The object that you selected is not a polyline object.
• You attempted to split a multi-segmented polyline (only single-section polylines can be split).
Converting Objects into Polyline Objects
If a region contains lakes or islands, and you convert that region to a polyline, the polyline has multiple
sections. Each lake or island comprises one section of the polyline. When you convert a circle or ellipse
into a polyline, the polyline contains 102 nodes. When you convert an arc into an ellipse, the number of
nodes depends on the starting and ending angle of the arc. If the arc spans 180 degrees (for example,
the starting angle is zero and the ending angle is 180), a polyline based on the arc will contain 52 nodes;
if the arc spans 90 degrees, a polyline based on the arc will contain 26 nodes; etc.
The Help System contains these related topics:
• Displaying Distance while Drawing Objects
• Displaying Distance, Length, Perimeter, and Area Calculations
• Specifying Distance, Length, Perimeter, and Area Calculations for a Particular Map
207 MapInfo Professional User Guide
Chapter 8: Drawing and Editing Objects