Autodesk 00308-011408-9F30A User Guide - Page 161
Drawing Curves
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Drawing Curves A curve is a finely-segmented polyline whose shape is determined by three or more control points. Instead of connecting a series of straight segments, the vertices in a curve guide the path of the polyline that approximates a smooth curve. There are two curve types: s A fitted curve passes through each vertex. s A spline curve is drawn toward each vertex. An open spline curve passes through its startpoint and endpoint. As with a normal polyline, you can specify that a curve be open or closed and you can assign it real world width. You can apply pattern fill to closed curves. Unlike a polyline, a curve has uniform width throughout its length, and it must have at least three vertices rather than two. You can convert a curve to a polyline at any time by selecting it and changing the current type setting in the drop-down list box on the left side of the edit bar. You can convert a curve to a series of short lines or to a polyline that duplicates the curve as it is rendered onscreen. This is useful when you want to retain the appearance of the curve but must edit a portion of it. For information on converting curves, see the chapter titled "Converting & Exploding Entity Types," which begins on page 313. Drawing Curves | 151