Creating a curve is a two step operation. The four methods (with their Shortcut keys) used to create a Curved Track are:
Control-4
) Drag from one endpoint in the direction of the Curve at that point and release. Click and Drag to position the second endpoint.
Control-5
) Drag from one of the endpoints to the Center of the Curved track and release. Click and Drag to position the second endpoint.
Control-6
) Drag from the Center of the Curved track to one of the endpoints and release. Click and Drag to position the second endpoint.
Control-7
) Drag from one endpoint to the other endpoint to form the Chord of the Curve and release. Click on the center of the track and Drag to form the Curve.
A drop down menu, which allows selection of the Curved Track creation method, is invoked from the down arrow button () located on the right side the Curved track button. Dependent upon previous selection, the Curved Track button will look like
,
,
or
.
In all cases, two Red arrow heads will be drawn after the first step to indicate where you can Drag to complete the second step.
A straight track will be created if the second endpoint is lined up with the first endpoint.
If the Snap Grid (Section 2.12.1) is enabled then the endpoints will be constrained to the grid.
Optionally, the curve center point and radius can be displayed for the Curve. This is enabled by the Move Label (Section 2.2.9) command.