Buffer Fence

Applicability:

• Cadcorp SIS Map Modeller
• Cadcorp SIS Map Editor
• Cadcorp SIS Map Manager
• Cadcorp SIS Map Express
• Cadcorp SIS ActiveX Modeller
• Cadcorp SIS ActiveX Manager
• Cadcorp SIS ActiveX Viewer

Ribbon Group:

Home-Selection

Associated commands:

• Circle Fence
• Offset Fence
• Polygon Fence

Also see:

• Buffer
• Thiessen Polygons

Description:

 Buffer Fence selects all items which lie within a certain distance either side of a temporarily constructed LineString (which may be a multi-segment LineString item).

Note: The default behaviour for all the Fence commands is that all Items partially or completely within, or touched by, the fence boundary will be selected. If you wish to select only those items completely contained within the fence boundary hold down the Ctrl key while creating the fence. See Selecting graphics - Selecting groups of items with a selection box.

You will first be prompted to enter a distance within which to find items, only positive values are valid. You can trace existing geometry similarly to the Trace mode of LineString [Create-Simple].

Example:

1. Select  Buffer Fence.
   
   The Distance to buffer with dialog will be displayed:
   
2. Enter a buffer distance, in this example 1000m. All items will be selected which fall within this distance either side of the fence line.
   
   
3. Click onto an existing piece of geometry, either a LineString or Polygon item, to start the fence.
   
   This example will trace the blue LineString between the green Polygons:
   
   
   Click the first point followed by subsequent points on the path: 
   
   
   When clicking points you may use the following key combinations:

Shift + snap

To draw to the snap point, even if it is not on the graphics (this is called jumping).

You will need to use this if you are not tracing existing graphics.

Ctrl + snap

To trace to the end of the LineString on which you snap, rather than to the snapped position.

Shift + Backspace

To go back to the last vertex point on the traced data, even if you jumped over it.

Press Enter to finish defining the path, or Ctrl + Enter to close by drawing to the first point snapped.

4. Press Escape to quit the command.
   

Note: The colour of the fence can be changed if required by creating a *Drag pen. See Selecting Graphics - Drag pen colour for a description of this function.

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