A curve is created by three objects: a circle and two
"legs," like a horseshoe. The circle establishes the radius and position
of the curve, while the legs establish the end points and the approach tracks.Like the curves in Linn Westcott's book, all curves in TrackLayer are circular -- if you want splines or spiral easements, you will have to draw them by hand using short straight segments.
A curve is created by three objects: a circle and two
"legs," like a horseshoe. The circle establishes the radius and position
of the curve, while the legs establish the end points and the approach tracks.
TrackLayer goes to some trouble to help you make nice curves. The program keeps the leg segments exactly tangent to the circles, both when drawing and editing.
This chapter describes how to draw and edit curves and circles.
Drawing a Curve
Editing a Curve
Loops and S-Curves
Helices