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@UML(identifier="GM_BSplineCurve", specification=ISO_19107) public interface BSplineCurve
A piecewise parametric polynomial or rational curve described
in terms of control points and basis functions. If the weights in the knots are equal
then it is a polynomial spline. If not, then it is a rational function spline. If
the boolean isPolynomial()
is set to true
then the weights shall all be set to 1.
A B-spline curve is a piecewise Bézier curve if it is quasi-uniform except that the
interior knots have multiplicity "degree" rather than having multiplicity one. In
this subtype the knot spacing shall be 1.0, starting at 0.0. A piecewise Bézier curve
that has only two knots, 0.0, and 1.0, each of multiplicity (degree+1), is equivalent
to a simple Bézier curve.
GeometryFactory.createBSplineCurve(int, org.opengis.geometry.coordinate.PointArray, java.util.List, org.opengis.geometry.coordinate.KnotType)
Method Summary | |
---|---|
SplineCurveForm |
getCurveForm()
Identifies particular types of curve which this spline is being used to approximate. |
int |
getDegree()
The algebraic degree of the basis functions. |
KnotType |
getKnotSpec()
Gives the type of knot distribution used in defining this spline. |
boolean |
isPolynomial()
true if this is a polynomial spline. |
Methods inherited from interface SplineCurve |
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getControlPoints, getKnots |
Methods inherited from interface CurveSegment |
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getBoundary, getCurve, getInterpolation, getNumDerivativesAtEnd, getNumDerivativesAtStart, getNumDerivativesInterior, getSamplePoints, reverse |
Methods inherited from interface GenericCurve |
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asLineString, forConstructiveParam, forParam, getEndConstructiveParam, getEndParam, getEndPoint, getParamForPoint, getStartConstructiveParam, getStartParam, getStartPoint, getTangent, length, length |
Method Detail |
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@UML(identifier="degree", obligation=MANDATORY, specification=ISO_19107) int getDegree()
getDegree
in interface SplineCurve
@UML(identifier="curveForm", obligation=OPTIONAL, specification=ISO_19107) SplineCurveForm getCurveForm()
null
.
@UML(identifier="knotSpec", obligation=OPTIONAL, specification=ISO_19107) KnotType getKnotSpec()
@UML(identifier="isPolynomial", obligation=MANDATORY, specification=ISO_19107) boolean isPolynomial()
true
if this is a polynomial spline.
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