Class IdentityTransform

    • Constructor Detail

      • IdentityTransform

        protected IdentityTransform​(int dimension)
        Constructs an identity transform of the specified dimension.
    • Method Detail

      • create

        public static LinearTransform create​(int dimension)
        Constructs an identity transform of the specified dimension.
      • isIdentity

        public boolean isIdentity()
        Tests whether this transform does not move any points. This implementation always returns true.
        Specified by:
        isIdentity in interface MathTransform
        Overrides:
        isIdentity in class AbstractMathTransform
        Returns:
        true if this MathTransform is an identity transform; false otherwise.
      • isIdentity

        public boolean isIdentity​(double tolerance)
        Tests whether this transform does not move any points. This implementation always returns true.
        Specified by:
        isIdentity in interface LinearTransform
        Parameters:
        tolerance - The tolerance factor.
        Returns:
        true if this transform is the identity one
      • getMatrix

        public Matrix getMatrix()
        Returns a copy of the identity matrix.
        Specified by:
        getMatrix in interface LinearTransform
        Returns:
        A copy of the underlying matrix.
      • derivative

        public Matrix derivative​(Position point)
        Gets the derivative of this transform at a point. For an identity transform, the derivative is the same everywhere.
        Specified by:
        derivative in interface MathTransform
        Overrides:
        derivative in class AbstractMathTransform
        Parameters:
        point - The coordinate point where to evaluate the derivative.
        Returns:
        The derivative at the specified point (never null).
      • transform

        public Position transform​(Position ptSrc,
                                  Position ptDst)
        Copies the values from ptSrc to ptDst. Overrides the super-class method for performance reason.
        Specified by:
        transform in interface MathTransform
        Overrides:
        transform in class AbstractMathTransform
        Parameters:
        ptSrc - the specified coordinate point to be transformed.
        ptDst - the specified coordinate point that stores the result of transforming ptSrc, or null.
        Returns:
        the coordinate point after transforming ptSrc and storing the result in ptDst, or a newly created point if ptDst was null.
        Since:
        2.2
      • transform

        public void transform​(float[] srcPts,
                              int srcOff,
                              float[] dstPts,
                              int dstOff,
                              int numPts)
        Transforms an array of floating point coordinates by this transform.
        Specified by:
        transform in interface MathTransform
        Overrides:
        transform in class AbstractMathTransform
        Parameters:
        srcPts - the array containing the source point coordinates.
        srcOff - the offset to the first point to be transformed in the source array.
        dstPts - the array into which the transformed point coordinates are returned. May be the same than srcPts.
        dstOff - the offset to the location of the first transformed point that is stored in the destination array.
        numPts - the number of point objects to be transformed.
      • transform

        public void transform​(double[] srcPts,
                              int srcOff,
                              double[] dstPts,
                              int dstOff,
                              int numPts)
        Transforms an array of floating point coordinates by this transform.
        Specified by:
        transform in interface MathTransform
        Parameters:
        srcPts - the array containing the source point coordinates.
        srcOff - the offset to the first point to be transformed in the source array.
        dstPts - the array into which the transformed point coordinates are returned. May be the same than srcPts.
        dstOff - the offset to the location of the first transformed point that is stored in the destination array.
        numPts - the number of point objects to be transformed.
      • hashCode

        public int hashCode()
        Returns a hash value for this transform. This value need not remain consistent between different implementations of the same class.
        Overrides:
        hashCode in class AbstractMathTransform
      • equals

        public boolean equals​(Object object)
        Compares the specified object with this math transform for equality.
        Overrides:
        equals in class AbstractMathTransform
        Parameters:
        object - The object to compare with this transform.
        Returns:
        true if the given object is a transform of the same class and if, given identical source position, the transformed position would be the equals.