C1 - Grid Reference

Script Family

Series C - Plan Production

Purpose

Generates coordinate grid references for selected viewports in a drawing layout.

When to Use

Use C1 during layout production when a standard plan or other viewport requires coordinate grid references.

Inputs

Target layout.
Viewport identification point.
Grid Reference Style: Grid Cross or Grid Line.
Grid Interval, with 0 indicating automatic calculation.
Optional note for lower-left sheet corner coordinate.
Optional Model Space viewport boundary plotting.

Outputs

Grid reference elements in the layout.
Optional lower-left sheet corner note.
Optional viewport boundary polyline in Model Space.

Workflow Summary

Open the target layout in Civil 3D.
Identify the viewport using a point inside it.
Choose Grid Cross or Grid Line style.
Define the grid interval or keep 0 for automatic interval selection.
Configure optional outputs.
Run the script to generate the grid reference.

None directly.

Reverse-Engineering Notes

When reverse-engineering this Dynamo graph, identify:

How the selected viewport is detected from a point.
How clipped and rotated viewport boundaries are handled.
How the automatic grid interval is calculated.
How the grid is regenerated or retained when an existing grid exists.
How layout-space and model-space elements are separated.

Source Basis

Primary source: HAPI User Manual.pdf, Section 2.5.1.
This note is a manual-facing script overview, not a PythonNet3 implementation specification.

Open Questions

Confirm exact grid interval calculation rules from the current script if needed for code migration.