Create Tangent Points from Point to Arc

(This functionality is available with the Computations module)

Creates points at the tangent point(s) of an arc, relative to a selected point, and optionally joins the points to the selected point.

To run this option, select the Create/Point command and the Method/Point Arc Tangents command from the Computations task to display the relevant dialog box.

Create Tangent Points by Point and Arc dialog box

Item	Used to
Point ID	ID of point(s) to be created.
Select Point	Select the point from which the tangents will be calculated.
Select Arc	Select the arc or circle of which the tangents will be calculated.
Compute	Compute the tangents and display on the screen.
Apply	Create the computed points (and optionally lines).
Either Northern and Southern or, Eastern or Western Line check boxes	Select either or both of these check boxes to nominate which tangent points will be created.
String/Join	Select if you wish lines to be created as well as the tangent points.
Insert	If checked, the tangent points will be inserted into the arc selected. Note that points will not be inserted into circles. If the arc is part of an alignment or polygon, points will not be inserted if they lie beyond the ends of the arc.
Break	If checked, the arc will be broken at the tangent points. Note that the 'Insert' check box must be checked for the break option to be available. Also be aware that although the arc may be broken, it will not be trimmed.
Next	Update the point identifier field to the next available identifier greater than the identifier currently shown.
Last	Update the point identifier field to one greater than the highest identifier in the data base.