Class AcGeCurve2d`Abstract`

Abstract base class for all 2d curves. Any class that is derived from this class represents a 2d curve.

Hierarchy (View Summary)

AcGeShape2d
- AcGeCurve2d

Index

Constructors

Properties

_boundingBoxNeedsUpdate arcLengthDivisions

Accessors

boundingBoxNeedUpdate box closed endPoint length startPoint

Methods

calculateBoundingBox getLength getLengths getPoint getPointAt getPoints getSpacedPoints getTangent getTangentAt getUtoTmapping transform translate

Constructors

constructor

new AcGeCurve2d(): AcGeCurve2d
Returns AcGeCurve2d
Overrides AcGeShape2d.constructor
- Defined in geometry/AcGeCurve2d.ts:11

Properties

`Protected`_boundingBoxNeedsUpdate

_boundingBoxNeedsUpdate: boolean = false

`Protected`arcLengthDivisions

arcLengthDivisions: number

Accessors

boundingBoxNeedUpdate

get boundingBoxNeedUpdate(): boolean
When this is set, it calculates the bounding box of this shape and resets this property to false. Default is false.

Returns boolean
Inherited from AcGeShape2d.boundingBoxNeedUpdate
- Defined in geometry/AcGeShape.ts:11

box

get box(): AcGeBox2d
The bounding box of this shape. Because it is a time-consuming operation to calculate the bounding box of one shape, the bounding box value is cached. It will be calculated again lazily once there are any changes to properties of this shape.

Returns AcGeBox2d
Inherited from AcGeShape2d.box
- Defined in geometry/AcGeShape2d.ts:31

`Abstract`closed

get closed(): boolean
Return true if its start point is identical to its end point. Otherwise, return false.

Returns boolean
- Defined in geometry/AcGeCurve2d.ts:19

endPoint

get endPoint(): AcGePoint2d
End point of this curve. If the curve is closed, coordinates of start point will be equal to coordinates of end point.

Returns AcGePoint2d
- Defined in geometry/AcGeCurve2d.ts:33

length

get length(): number
Length of this curve.

Returns number
- Defined in geometry/AcGeCurve2d.ts:40

startPoint

get startPoint(): AcGePoint2d
Start point of this curve. If the curve is closed, coordinates of start point will be equal to coordinates of end point.

Returns AcGePoint2d
- Defined in geometry/AcGeCurve2d.ts:25

Methods

`Protected` `Abstract`calculateBoundingBox

calculateBoundingBox(): AcGeBox2d
Return true if this shape contains the specified shape

Returns AcGeBox2d
Inherited from AcGeShape2d.calculateBoundingBox
- Defined in geometry/AcGeShape2d.ts:42

getLength

getLength(): number
Get total curve arc length.

Returns number
Return total curve arc length.
- Defined in geometry/AcGeCurve2d.ts:97

getLengths

getLengths(divisions?: number): number[]
Get list of cumulative segment lengths.
Parameters
- divisions: number = ...
  Input number of pieces to divide the curve into.
Returns number[]
Return list of cumulative segment lengths.
- Defined in geometry/AcGeCurve2d.ts:107

getPoint

getPoint(_t: number): AcGePoint2d
Return the point for a given position on the curve according to the arc length.
Parameters
- _t: number
Returns AcGePoint2d
Return the point for a given position on the curve according to the arc length.
- Defined in geometry/AcGeCurve2d.ts:49

getPointAt

getPointAt(u: number): AcGePoint2d
Return a point for a given position on the curve according to the arc length.
Parameters
- u: number
  Input a position on the curve according to the arc length. Must be in the range [0, 1].
Returns AcGePoint2d
Return a point for a given position on the curve according to the arc length.
- Defined in geometry/AcGeCurve2d.ts:58

getPoints

getPoints(divisions?: number): AcGePoint2d[]
Return a set of divisions + 1 points using getPoint(t).
Parameters
- divisions: number = 5
  Input number of pieces to divide the curve into. Default is 5.
Returns AcGePoint2d[]
Return a set of divisions + 1 points using getPoint(t)
- Defined in geometry/AcGeCurve2d.ts:68

getSpacedPoints

getSpacedPoints(divisions?: number): AcGePoint2d[]
Return a set of divisions + 1 equi-spaced points using getPointAt(u).
Parameters
- divisions: number = 5
  Input number of pieces to divide the curve into. Default is 5.
Returns AcGePoint2d[]
Return a set of divisions + 1 equi-spaced points using getPointAt(u).
- Defined in geometry/AcGeCurve2d.ts:83

getTangent

getTangent(t: number): AcGePoint2d
Return a unit vector tangent at t. If the derived curve does not implement its tangent derivation, two points a small delta apart will be used to find its gradient which seems to give a reasonable approximation.
Parameters
- t: number
  Input a position on the curve. Must be in the range [ 0, 1 ].
Returns AcGePoint2d
Return a unit vector tangent at t.
- Defined in geometry/AcGeCurve2d.ts:195

getTangentAt

getTangentAt(u: number): AcGePoint2d
Return tangent at a point which is equidistant to the ends of the curve from the point given in getTangent.
Parameters
- u: number
  Input a position on the curve according to the arc length. Must be in the range [0, 1].
Returns AcGePoint2d
Return tangent at a point which is equidistant to the ends of the curve from the point given in getTangent.
- Defined in geometry/AcGeCurve2d.ts:220

getUtoTmapping

getUtoTmapping(u: number, distance?: number): number
Given u in the range (0 .. 1), returns t also in the range ( 0 .. 1 ). u and t can then be used to give you points which are equidistant from the ends of the curve, using getPoint.
Parameters
- u: number
- Optionaldistance: number
Returns number
- Defined in geometry/AcGeCurve2d.ts:128

`Abstract`transform

transform(matrix: AcGeMatrix2d): this
Transforms the entity by applying the input matrix.
Parameters
- matrix: AcGeMatrix2d
  Input transformation matrix
Returns this
Inherited from AcGeShape2d.transform
- Defined in geometry/AcGeShape2d.ts:24

translate

translate(v: AcGeVector2dLike): this
Return new shape translated by given vector.
Parameters
- v: AcGeVector2dLike
Returns this
Inherited from AcGeShape2d.translate
- Defined in geometry/AcGeShape2d.ts:16