PointAndDerivatives method
Returns a point and derivatives at a position along a curve's path.
Version added
5.0
Syntax
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object |
Required. An expression that returns a Curve object. |
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t |
Required Double. The value in the curve's parameter domain to evaluate. |
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n |
Required Integer. 0: get point; 1: point and 1st derivative; 2: point plus first and second derivative. |
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x |
Required Double. Returns x value of curve at t. |
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y |
Required Double. Returns y value of curve at t. |
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dx |
Required Double. Returns first derivative (dx/dt) at t if n > 0. |
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dy |
Required Double. Returns first derivative (dx/dt) at t if n > 0. |
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ddx |
Required Double. Returns second derivative (ddx/dt) at t if n > 1. |
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ddy |
Required Double. Returns second derivative (ddy/dt) at t if n > 1. |
Remarks
Use the PointAndDerivatives method of the Curve object to obtain the coordinates of a point within the curve's parameter domain and its first and second derivatives.
A Curve object describes itself in terms of its parameter domain which is the range [Start(),End()]. The PointAndDerivatives method can be used to extrapolate the curve's path outside [Start(),End()].