How to Fill PLine in AutoCAD?

Filling a Polyline in AutoCAD

Filling a polyline in AutoCAD can be quite straightforward once you understand the steps involved. The process involves creating a polyline, defining its area, and then applying a fill to it. Here’s a detailed guide on how to accomplish this in AutoCAD 2025.

Step 1: Creating a Polyline

1. Access the Polyline Tool: Go to the Home tab and locate the Draw panel. Click on the Polyline (Pline) icon.
2. Set the First Point: Click on the drawing area to set the first point of your polyline.
3. Define the Segment: Move your cursor to specify the endpoint of the first line segment and click again.
4. Switch to Arc Mode: If you want to create an arc, type A for Arc at the command prompt and complete the arc segment.
5. Return to Line Mode: Type L for Line to continue adding linear segments.
6. Complete the Polyline: Continue specifying points and segments until you have shaped the desired outline. End the command by pressing Enter.

Step 2: Closing the Polyline

To fill the area inside the polyline, ensure that it forms a closed shape. If it’s an open polyline, you can close it by selecting the last endpoint and connecting it back to the start point or using the C option in the command.

Step 3: Filling the Polyline with Hatching

1. Activate the Hatch Tool: Navigate to the Home tab and select the Hatch option within the Draw panel.
2. Choose Hatch Type: In the Hatch Creation tab, find the Properties panel. Here, select the Hatch Type you want to use. Common options include Solid, Gradient, and Pattern.
3. Select the Fill Pattern: On the Pattern panel, choose the fill pattern that suits your design. For a simple fill, select "Solid."
4. Specify Boundaries: In the Boundaries panel, ensure the boundary is set correctly. Use tools to pick the area or object you want to fill directly.
5. Click Inside the Closed Polyline: Click inside the defined polyline to apply the fill. Ensure that it is entirely enclosed; otherwise, the fill will not appear.

Step 4: Finalizing the Fill

After clicking inside the polyline to initiate the fill, you may want to finalize your hatch by pressing Enter. If needed, you can edit the fill properties later using the Hatch Editor command.

Frequently Asked Questions (FAQ)

1. Can I modify the hatch pattern after creating it?
   Yes, you can modify the hatch pattern using the Hatch Edit command, which allows you to adjust properties such as scale, angle, and pattern type.

2. What should I do if the hatch doesn’t appear?
   Verify that the hatch layer is activated and not frozen. Also, check the options under Display to ensure that “Apply Solid Fill” is enabled. Additionally, confirm that the area you are attempting to hatch is properly closed and free of overlapping lines.

3. Is it possible to fill a polyline with a gradient in AutoCAD?
   Yes, when selecting the Hatch type in the Hatch Creation tab, you can choose a Gradient fill, allowing for smoother transitions between colors in the filled area.