Package org.geotools.referencing.operation.transform

Class AffineTransform2D

Object
AffineTransform
XAffineTransform
AffineTransform2D
All Implemented Interfaces:
Serializable, Cloneable, MathTransform, MathTransform2D, Cloneable, LinearTransform, Formattable
public class AffineTransform2D extends XAffineTransform implements MathTransform2D, LinearTransform, Formattable, Cloneable
Transforms two-dimensional coordinate points using an affine transform. This class both extends AffineTransform and implements MathTransform2D, so it can be used as a bridge between Java2D and the referencing module.
Since:
2.5
Author:
Martin Desruisseaux (IRD)
See Also:

  • Constructor Details

    • AffineTransform2D

      public AffineTransform2D(AffineTransform transform)
      Constructs a new affine transform with the same coefficient than the specified transform.

    • AffineTransform2D

      public AffineTransform2D(double m00, double m10, double m01, double m11, double m02, double m12)
      Constructs a new AffineTransform2D from 6 values representing the 6 specifiable entries of the 3×3 transformation matrix. Those values are given unchanged to the super class constructor.
      Since:
      2.5

  • Method Details

    • checkPermission

      protected final void checkPermission() throws UnsupportedOperationException
      Throws an UnsupportedOperationException when a mutable method is invoked, since AffineTransform2D must be immutable.
      Overrides:
      checkPermission in class XAffineTransform
      Throws:
      UnsupportedOperationException - if this affine transform is immutable.

    • getParameterValues

      public ParameterValueGroup getParameterValues()
      Returns the matrix elements as a group of parameters values. The number of parameters depends on the matrix size. Only matrix elements different from their default value will be included in this group.
      Returns:
      A copy of the parameter values for this math transform.

    • getSourceDimensions

      public final int getSourceDimensions()
      Gets the dimension of input points, which is fixed to 2.
      Specified by:
      getSourceDimensions in interface MathTransform
      Returns:
      The dimension of input points.

    • getTargetDimensions

      public final int getTargetDimensions()
      Gets the dimension of output points, which is fixed to 2.
      Specified by:
      getTargetDimensions in interface MathTransform
      Returns:
      The dimension of output points.

    • transform

      public Position transform(Position ptSrc, Position ptDst)
      Transforms the specified ptSrc and stores the result in ptDst.
      Specified by:
      transform in interface MathTransform
      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.

    • createTransformedShape

      public Shape createTransformedShape(Shape shape)
      Transforms the specified shape.
      Specified by:
      createTransformedShape in interface MathTransform2D
      Overrides:
      createTransformedShape in class AffineTransform
      Parameters:
      shape - Shape to transform.
      Returns:
      Transformed shape, or shape if this transform is the identity transform.

    • getMatrix

      public Matrix getMatrix()
      Returns this transform as an affine transform matrix.
      Specified by:
      getMatrix in interface LinearTransform
      Returns:
      A copy of the underlying matrix.

    • derivative

      public Matrix derivative(Point2D point)
      Gets the derivative of this transform at a point. For an affine transform, the derivative is the same everywhere.
      Specified by:
      derivative in interface MathTransform2D
      Parameters:
      point - The coordinate point where to evaluate the derivative. Null value is accepted only if the derivative is the same everywhere. For example affine transform accept null value since they produces identical derivative no matter the coordinate value. But most map projection will requires a non-null value.
      Returns:
      The derivative at the specified point as a 2×2 matrix. This method never returns an internal object: changing the matrix will not change the state of this math transform.

    • derivative

      public Matrix derivative(Position point)
      Gets the derivative of this transform at a point. For an affine transform, the derivative is the same everywhere.
      Specified by:
      derivative in interface MathTransform
      Parameters:
      point - The coordinate point where to evaluate the derivative. Null value is accepted only if the derivative is the same everywhere. For example affine transform accept null value since they produces identical derivative no matter the coordinate value. But most map projection will requires a non-null value.
      Returns:
      The derivative at the specified point (never null). This method never returns an internal object: changing the matrix will not change the state of this math transform.

    • inverse

      public MathTransform2D inverse() throws NoninvertibleTransformException
      Creates the inverse transform of this object.
      Specified by:
      inverse in interface MathTransform
      Specified by:
      inverse in interface MathTransform2D
      Returns:
      The inverse transform.
      Throws:
      NoninvertibleTransformException - if this transform can't be inverted.

    • clone

      public AffineTransform clone()
      Returns a new affine transform which is a modifiable copy of this transform. We override this method because it is defined in the super-class. However this implementation do not returns a new AffineTransform2D instance because the later is unmodifiable, which make exact cloning useless.
      Specified by:
      clone in interface Cloneable
      Overrides:
      clone in class AffineTransform
      Returns:
      A copy of this object.
      See Also:

    • formatWKT

      public String formatWKT(Formatter formatter)
      Format the inner part of a Well Known Text (WKT) element.
      Specified by:
      formatWKT in interface Formattable
      Parameters:
      formatter - The formatter to use.
      Returns:
      The WKT element name.
      See Also:

    • toWKT

      public String toWKT()
      Returns the WKT for this transform.
      Specified by:
      toWKT in interface MathTransform
      Returns:
      The Well Known Text (WKT) for this object.

    • toString

      public String toString()
      Returns the WKT representation of this transform.
      Overrides:
      toString in class AffineTransform

    • equals

      public boolean equals(Object obj)
      Overrides:
      equals in class AffineTransform