Point2d Class

2D point with x,y as properties

Extends

Implements

Methods

Name Description
constructor(x: number = 0, y: number = 0): Point2d Constructor for Point2d  
addForwardLeft(tangentFraction: number, leftFraction: number, vector: Vector2d): Point2d Starting at this point, move along vector by tangentFraction of the vector length, and to the left by leftFraction of
the perpendicular vector length.
 
clone(): Point2d return a new Point2d with x,y coordinates from this.  
crossProductToPoints(target1: XAndY, target2: XAndY): number Returns the (scalar) cross product of two points/vectors, computed from origin to target1 and target2  
dotVectorsToTargets(targetA: XAndY, targetB: XAndY): number Return the dot product of vector from this to targetA and vector from this to targetB  
forwardLeftInterpolate(tangentFraction: number, leftFraction: number, point: XAndY): Point2d Interpolate at tangentFraction between this instance and point.  
fractionOfProjectionToLine(startPoint: Point2d, endPoint: Point2d, defaultFraction?: number): number Return the fractional coordinate of the projection of this instance x,y onto the line from startPoint to endPoint.  
interpolate(fraction: number, other: XAndY, result?: Point2d): Point2d Return a point interpolated between this point and the right param.  
interpolateXY(fractionX: number, fractionY: number, other: XAndY, result?: Point2d): Point2d Return a point with independent x,y fractional interpolation.  
minus(vector: XAndY, result?: Point2d): Point2d Return this point minus vector  
plus(vector: XAndY, result?: Point2d): Point2d Return point plus vector  
plus2Scaled(vectorA: XAndY, scalarA: number, vectorB: XAndY, scalarB: number, result?: Point2d): Point2d Return point + vectorA scalarA + vectorB scalarB  
plus3Scaled(vectorA: XAndY, scalarA: number, vectorB: XAndY, scalarB: number, vectorC: XAndY, scalarC: number, result?: Point2d): Point2d Return point + vectorA scalarA + vectorB scalarB + vectorC * scalarC  
plusScaled(vector: XAndY, scaleFactor: number, result?: Point2d): Point2d Return point + vector * scalar  
plusXY(dx: number = 0, dy: number = 0, result?: Point2d): Point2d Return point plus vector  
create(x: number = 0, y: number = 0, result?: Point2d): Point2d Static Return a point (newly created unless result provided) with given x,y coordinates  
createFrom(xy: XAndY | undefined, result?: Point2d): Point2d Static Create (or optionally reuse) a Point2d from another object with fields x and y  
createZero(result?: Point2d): Point2d Static Create a Point2d with both coordinates zero.  
fromJSON(json?: XYProps): Point2d Static Convert JSON [1,2] or {x:1, y:2} to a Point2d instance  

Inherited methods

Name Inherited from Description
distance(other: XAndY): number XY Return the distance from this point to other
distanceSquared(other: XAndY): number XY Return squared distance from this point to other
freeze(): void XY Freeze this instance (and its deep content) so it can be considered read-only
isAlmostEqual(other: XAndY, tol?: number): boolean XY Returns true if this and other have equal x,y parts within Geometry.smallMetricDistance.
isAlmostEqualMetric(other: XAndY): boolean XY returns true if x,y match other within metric tolerance
isAlmostEqualXY(x: number, y: number, tol?: number): boolean XY Returns true if this and other have equal x,y parts within Geometry.smallMetricDistance.
isExactEqual(other: XAndY): boolean XY returns true if the x,y components are exactly equal.
magnitude(): number XY Return the magnitude of the vector
magnitudeSquared(): number XY Return the squared magnitude of the vector.
maxAbs(): number XY Return the largest absolute value of any component
maxDiff(other: XAndY): number XY Return the largest absolute distance between corresponding components
set(x: number = 0, y: number = 0): void XY Set both x and y.
setFrom(other?: XAndY): void XY Set both x and y from other.
setFromJSON(json?: XYProps): void XY Set x and y from a JSON source such as [1,2] or {x:1, y:2}
setZero(): void XY Set both x and y to zero
toJSON(): XYProps XY return a json array [x,y]
toJSONXY(): XYProps XY return a json object {x: 1, y:2}
unitVectorTo(target: XAndY, result?: Vector2d): Vector2d | undefined XY Return a unit vector from this point to other
vectorTo(other: XAndY, result?: Vector2d): Vector2d XY Return a (full length) vector from this point to other
crossProductToPoints(origin: XAndY, targetA: XAndY, targetB: XAndY): number Static XY cross product of vectors from origin to targets

Inherited properties

Name Type Inherited from Description
isAlmostZero Accessor ReadOnly boolean XY returns true if the x,y components are both small by metric metric tolerance
x number XY x component
y number XY y component

Defined in

Last Updated: 03 June, 2019