BSpline2dNd Class
Bspline knots and poles for 2d-to-Nd.
- This abstract class in not independently instantiable -- GeometryQuery methods must be implemented by derived classes.
Extends
Extended by
Methods
Name | Description | |
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constructor(numPolesU: number, numPolesV: number, poleLength: number, knotsU: KnotVector, knotsV: KnotVector): BSpline2dNd Protected | initialize arrays for given spline dimensions. | |
degreeUV(select: UVSelect): number | Return the degree (one less than order) for the select direction (0 or 1) |
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evaluateBuffersAtKnot(u: number, v: number, numDerivative: number = 0): void | Evaluate the _basisBuffer, _poleBuffer and (optionally) _basisBuffer1 and _poleBuffer1 arrays at given knot. | |
extendRangeXYZ(rangeToExtend: Range3d, transform?: Transform): void | extend a range, treating each block as simple XYZ | |
extendRangeXYZH(rangeToExtend: Range3d, transform?: Transform): void | extend a range, treating each block as homogeneous xyzw, with weight at offset 3 | |
fractionToPointAndDerivatives(_fractionU: number, _fractionV: number, _result?: Plane3dByOriginAndVectors): Plane3dByOriginAndVectors | undefined Abstract | abstract declaration for evaluation of (unweighted) 3d point and derivatives. | |
fractionToRigidFrame(fractionU: number, fractionV: number, result?: Transform): Transform | undefined | evaluate the surface at u and v fractions. | |
getPoint3dPole(i: number, j: number, result?: Point3d): Point3d | undefined | Get the Point3d by row and column. | |
getPoint3dPoleXYZW(i: number, j: number, result?: Point3d): Point3d | undefined | Get the Point3d by row and column, projecting the weight away to get to xyz * (IMPORTANT) This assumes this is an xyzw surface. |
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isClosable(select: UVSelect): boolean | Test if degree leading and trailing (one of U or V) blocks match, as if the data is an unwrapped closed spline in the selected direction. |
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numPolesTotal(): number | Return the total number of poles (product of x and y pole counts) | |
numPolesUV(select: UVSelect): number | Return the number of poles for the select direction (0 or 1) |
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numSpanUV(select: UVSelect): number | Return the number of spans (INCLUDING NULL SPANS) for the select direction (0 or 1) |
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numberToUVSelect(value: number): UVSelect | Return 0 for 0 input, 1 for any nonzero input. | |
orderUV(select: UVSelect): number | Return the order (one more than degree) for the select direction (0 or 1) |
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poleStepUV(select: UVSelect): number | Return the step between adjacent poles for the select direction (0 or 1) |
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reverseInPlace(select: UVSelect): void | Reverse the parameter direction for either u or v. | |
setWrappable(select: UVSelect, value: BSplineWrapMode): void | Set the flag indicating the bspline might be suitable for having wrapped "closed" interpretation. | |
spanFractionToKnot(select: UVSelect, span: number, localFraction: number): number | Map a position, specified as (uv direction, bezier span, fraction within the bezier), to an overall knot value. | |
spanFractionsToBasisFunctions(select: UVSelect, spanIndex: number, spanFraction: number, f: Float64Array, df?: Float64Array): void | Evaluate basis functions given choice of u or v span index * local fraction within the span. |
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sumPoleBufferForSpan(spanIndexU: number, spanIndexV: number): void | sum poles by the weights in the basisBuffer, using poles for given span | |
sumpoleBufferDerivativesForSpan(spanIndexU: number, spanIndexV: number): void | sum derivatives by the weights in the basisBuffer, using poles for given span | |
validOrderAndPoleCounts(orderU: number, numPolesU: number, orderV: number, numPolesV: number, numUV: number): boolean Static | Confirm that order and pole counts agree for both u and v directions |
Inherited methods
Name | Inherited from | Description |
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clone(): GeometryQuery | undefined Abstract | GeometryQuery | return a clone |
cloneTransformed(transform: Transform): GeometryQuery | undefined Abstract | GeometryQuery | return a transformed clone. |
dispatchToGeometryHandler(handler: GeometryHandler): any Abstract | GeometryQuery | * "double dispatch" call pattern. |
extendRange(rangeToExtend: Range3d, transform?: Transform): void Abstract | GeometryQuery | extend rangeToExtend by the range of this geometry multiplied by the transform |
isAlmostEqual(other: GeometryQuery): boolean | GeometryQuery | test for exact structure and nearly identical geometry. |
isSameGeometryClass(other: GeometryQuery): boolean Abstract | GeometryQuery | test if (other instanceof this.Type). |
range(transform?: Transform, result?: Range3d): Range3d | GeometryQuery | return the range of the entire (tree) GeometryQuery |
tryTransformInPlace(transform: Transform): boolean Abstract | GeometryQuery | Attempt to transform in place. |
tryTranslateInPlace(dx: number, dy: number = 0, dz: number = 0): boolean | GeometryQuery | try to move the geometry by dx,dy,dz |
Properties
Name | Type | Description | |
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_basisBuffer1UV Protected | Float64Array[] | a scratch array sized for order numbers |
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_basisBufferUV Protected | Float64Array[] | a scratch array sized for order numbers |
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_poleBuffer Protected | Float64Array | a scratch array sized for one pole | |
_poleBuffer1UV Protected | Float64Array[] | array of 2 scratch array, each sized for one pole * used in derivative evaluations, with respective u and v derivatives in the respective arrays. |
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coffs | Float64Array | flat array of coordinate daa, blocked by poleDimension and row | |
geometryCategory | "bsurf" = "bsurf" | String name for schema properties | |
knots | KnotVector[] | Array of (exactly 2) knot vectors for the u, v directions | |
poleDimension | number | Number of componets per pole. |
Inherited properties
Name | Type | Inherited from | Description |
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children Accessor ReadOnly | GeometryQuery[] | undefined | GeometryQuery | return GeometryQuery children for recursive queries. * leaf classes do not need to implement. |
Defined in
Last Updated: 08 January, 2020