AutoCAD Automated Polyline Dimension

Automatically Dimension Polylines. To use this marvellous tool, draw a polyline and load the LISP code. Type DPL at the Command prompt to activate the function and pick the polyline. This routine automatically dimensions the y distances. The current dimension variables are used as defaults. Y distance dimensions are created from one vertex to the next along with an overall y distance. The program is nicely structured so you can modify it to automatically dimension other items or properties if you are inclined to play with the LISP code.

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LISP (List Processing) is a programming language that allows users to create custom commands and automate repetitive tasks in AutoCAD. It is widely used for creating routines that can simplify complex or repetitive drafting processes.

Purpose of the Automated Polyline Dimension LISP

The purpose of this LISP routine is to automatically add dimensions to each segment of a polyline. This is useful in civil engineering, architecture, and mechanical design, where accurate dimensioning of polyline segments is crucial.

How the LISP Routine Works

1. Selection of Polyline: The LISP routine begins by prompting the user to select a polyline. The selected polyline can be either open or closed.

2. Dimensioning: Once the polyline is selected, the routine will iterate through each vertex of the polyline, automatically placing a linear dimension between consecutive vertices. For closed polylines, it can also add dimensions for the final segment connecting the last point back to the first point.

3. Customization: The LISP routine can be customized to fit specific needs, such as adjusting dimension styles, offsets, or applying specific dimension layers.

4. How to Use the LISP Routine

   1. Load the LISP File: Save the LISP code to a .lsp file. Load the file in AutoCAD by typing APPLOAD in the command line and selecting the file.

   2. Run the Command: After loading, you can run the routine by typing DimPolyline in the command line.

   3. Select Polyline: The command will prompt you to select the polyline you wish to dimension. After selection, the dimensions will automatically be added to each segment.

   Benefits of Using This LISP Routine

   • Efficiency: Automates the task of dimensioning each polyline segment, saving time and reducing the potential for errors.
   • Consistency: Ensures that all dimensions are applied consistently according to your predefined standards.
   • Flexibility: The routine can be customized to fit different styles, layer settings, and dimensioning preferences.

   Customization and Expansion

   This basic routine can be expanded to include more advanced features such as:

   • Handling polylines with arcs.
   • Adding options for different dimension styles or layers.
   • Adding annotations or additional information to the dimensions.

   Using a LISP routine to automate polyline dimensioning in AutoCAD is an effective way to streamline your workflow. With a few lines of code, you can save hours of manual work, ensure consistency across your drawings, and reduce the likelihood of errors.