Create Tangent Points Between 2 Arcs

(This functionality is available with the Computations module)

Creates points at the tangent point(s) of two arcs, and optionally joins the points together.

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

Create Tangent Points by 2 Arcs dialog box

Item	Used to
Point ID	ID of point(s) to be created.
Select First Arc	Select the arc or circle of which the tangents will be calculated.
Select Second Arc	Select the other 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 lines if the "String" option is selected).
Either Northern and Southern or, Eastern or Western Line and also Cross Line 1 and Cross Line 2 check boxes	Check any of these 4 check boxes to nominate which tangent points will be created.
String/Join	Check if you wish lines to be created as well as the tangent points.
Insert	If checked, the tangent points will be inserted into any arcs 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 arcs will be broken at the tangent points. Note that the 'Insert' check box must be selected for the break option to be available. Also be aware that although the arcs may be broken, they 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.