How to fill a Polyline in AutoCAD?

To fill a closed polyline in AutoCAD, you can utilize the ADEFILLPOLYG command, particularly useful in environments like AutoCAD Map 3D or Civil 3D which include the Autodesk Civil/GIS tools.

Understanding ADEFILLPOLYG

The ADEFILLPOLYG command is designed specifically for filling closed polylines, often used in mapping and civil engineering workflows to represent areas with a solid color fill. It's a straightforward process that applies a solid hatch or fill to selected closed polyline objects or all closed polylines on a specific layer.

Steps to Fill a Closed Polyline

Based on the provided reference, here are the steps to fill a closed polyline using the ADEFILLPOLYG command:

1. Initiate the Command: On the AutoCAD command line, type ADEFILLPOLYG and press Enter.
2. Choose Selection Method: The ADEFILLPOLYG command prompt will ask you to specify how you want to select the polylines to be filled. You can typically choose between:
   • Select Objects: Manually pick the individual polylines you want to fill.
   • Specify Layer: Fill all closed polylines that reside on a designated layer.
3. Select Objects or Specify Layer:
   • If you chose "Select Objects," click on the specific closed polylines in your drawing area. Press Enter when done selecting.
   • If you chose "Specify Layer," you will be prompted to enter the name of the layer whose polylines you want to fill. Type the layer name and press Enter.
4. Specify Fill Color: The command will then prompt you to specify the color you want to use for the fill. You can typically enter a color number (e.g., 1 for Red, 7 for White/Black) or select from a color palette option if available. Enter the desired color value and press Enter.

Once you complete these steps, the selected closed polylines (or all on the specified layer) will be filled with the solid color you selected.

Important Considerations

• Closed Polylines: The ADEFILLPOLYG command works only on closed polylines. An open polyline will not be filled. Ensure your polylines form a complete loop.
• Solid Fill: This command typically applies a solid fill (similar to a solid hatch pattern).
• Command Availability: While ADEFILLPOLYG is a standard command in AutoCAD Map 3D and Civil 3D, its availability in vanilla AutoCAD might depend on installed toolsets or add-ons. Standard hatching (HATCH command) with a solid pattern is another common way to fill closed objects in any AutoCAD version.

Using ADEFILLPOLYG provides a quick way to add solid fills based on existing closed polyline boundaries, simplifying tasks like area representation in maps or site plans.