This ruler was added in version 17.01.06.
This ruler mode will help you draw circles and ellipses. It has the following parameters you can adjust:
The ellipse center can be moved around by dragging its center point. The size of the ellipse is determined by your pen down position. It is currently not possible to lock the ellipse to a certain size. If you look at the minor and major axis, a portion of them will be orange. This indicates the size of the last drawn ellipse. Use these guides if you need to draw multiple ellipses of the same size at different locations, or disconnected portions of the same ellipse.
The Auto Fit button (or associated global shortcut) can help you find good parameters automatically. Simply press the button, then sketch an ellipse (it doesn't have to be complete), and LNP will try to find the best parameters that fit your sketch! You can then fine-tune via the interactive control points.
You can activate the interactive control points by holding the control key. You'll notice that the center point becomes yellow. In this mode, it slides along the minor or major axis. Hold shift while using the rotation handle to clamp to 5° increments.
When the Box Mode parameter is active, the active span limits will be shown in orange on the ellipse and radial line.
When this ruler is active, you can use the following predefined input variables when scripting:
See the Circular Patterns and Isometric Circle Patterns script modes for examples on how to use these. The Misc - Gears preset uses the circular square wave mode to create perfect gear shapes.