API Reference > imodeljs-common > Geometry > AffineTransform AffineTransform Class The equations are: X1 = a1X + a2Y + TranslationX Y1 = b1X + b2Y + translationY An affine representing no transformation will have: a1 = 1.0, a2 = 0.0, b1 = 0.0, b2 = 1.0. Implements AffineTransformProps Methods Name Description constructor(data?: AffineTransformProps): AffineTransform equals(other: AffineTransform): boolean Compares two Affine Transforms. toJSON(): AffineTransformProps Creates a JSON from the Affine Transform definition fromJSON(data: AffineTransformProps): AffineTransform Static Creates an Affine Transform from JSON representation. Properties Name Type Description a1 Readonly number A1 value as defined in global comment. a2 Readonly number A2 value as defined in global comment. b1 Readonly number B1 value as defined in global comment. b2 Readonly number B2 value as defined in global comment. translationX Readonly number The X post translation translationY Readonly number The Y post-translation Defined in core/common/src/geometry/Projection.ts Line 97 Last Updated: 11 June, 2024