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- Curves, Introduction
-
- Smooth curves are achieved in QD3D by locating points that
- govern the shape of the curve (Bezier and B-spline curves).
-
- If any of the points on a curve are deleted (see 4.4 POINT DEL
- for details), then the curve is also deleted.
-
- When prompted to select a curve, the user does so by selecting
- any point defining the curve with the selection button.
-
-
- "CURVE ADD"
-
- This command is used to add curves to the screen. The user
- inputs the points to define the curve and QikDraw calculates and
- plots the curve. Two types of curve are supported, bezier and B-
- spline.
-
- Procedure
- . Specify if adding a Bezier or B-spline.
- . Specify the degree of the curve.
- . Add points to define the curve as desired.
-
-
- "CURVE DEL"
-
- This command allows the user to delete selected curves the same
- way as lines are deleted. HELP LINE for details.
-
-
- CURVE UNPAK"
-
- This command is used to UNPACK the curve. The user is prompted
- to select the curve by locating one of the points defining the
- curve (a definition point). QD3D then unpacks the curve into
- lines and points.
-
-
- "CURVE CHNG"
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- A selected curve can be changed to reflect current definitions
- of pen and layer the same as any other element.
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-