SPLINE creates curves called nonuniform rational B-splines (NURBS), referred to as splines for simplicity. Splines are defined either with fit points, or with control vertices. By default, fit points coincide with the spline, while control vertices define a control frame. Control frames provide a convenient method to shape the spline. Each method has its advantages. To display or hide the control vertices and control frame, select or deselect the spline, or use CVSHOW and CVHIDE.

Jul 01, 1999  AutoCAD R14 introduced a new object named a lightweight polyline that replaces the complex polyline object. When you create a drawing in Release 14 and use commands to create polylines, then you are most likely creating lightweight polylines. From an AutoCAD user's perspective, the lightweight polyline is exactly like the older polyline.

However, for splines created with control vertices in AutoCAD LT, you can display the control frame only by selecting the spline. Method Controls whether the spline is created with fit points or with control vertices. (SPLMETHOD system variable) Fit Creates a degree 3 (cubic) B-spline by specifying fit points that the spline must pass through. When the tolerance value is greater than 0, the spline must be within the specified tolerance distance from each point.

Control Vertices (CV) Creates a spline by specifying control vertices. Use this method to create splines of degree 1 (linear), degree 2 (quadratic), degree 3 (cubic), and so on up to degree 10.

Adjusting the shape of a spline by moving control vertices often provides better results than moving fit points. ( Chord-Length method) Spaces the knots connecting each component curve to be proportional to the distances between each associated pair of fit points. An example is the green curve in the illustration. • Square root. (Centripetal method) Spaces the knots connecting each component curve to be proportional to the square root of the distance between each associated pair of fit points. This method usually produces “gentler” curves. (Equidistant method).

Spaces the knots of each component curve to be equal, regardless of the spacing of the fit points. This method often produces curves that overshoot the fit points. Reshebnik naglyadnaya geometria 7 klass kazakov. Start Tangency Specifies a tangent condition on the starting point of the spline.

Hello, I'm runngin AutoCAD 2006 and have built an application with VBA. I've got the following code in my application in an attempt to create a six sided shape programmatically: Private Sub cmdTest_Click() Dim Points(5) As Double Dim PLine As AcadLWPolyline Dim SelectionSet As AcadSelectionSet Points(0) = 20: Points(1) = 20: Points(2) = 20 Points(3) = 20: Points(4) = 20 Set AcadPolyline = ThisDrawing.ModelSpace.AddLightWeightPolyline(Points) ZoomAll End Sub All I get is a straight line.

What am I missing here? Any help is greatly appreciated. Array is Vertices coordinates list, not Point, which has either 2 elemens as x and y, or 3 elements as x, y, z. Since the polyline is 2D polyline, the array must have at least 4 elements (two points) and the number of elements must be even. In your case, you supplied 5 elements, which is 2 and half points, as following: Point1: x=20, y=20 Point2: x=20, y=20 Point3: x=20, y=not supplied.

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