com.revolsys.jts.geom.util

Class AffineTransformationFactory

java.lang.Object

com.revolsys.jts.geom.util.AffineTransformationFactory

public class AffineTransformationFactory
extends Object

Supports creating AffineTransformations defined by various kinds of inputs and transformation mapping rules.

Author:

Martin Davis

Constructor Summary

Constructors

Constructor and Description
AffineTransformationFactory()

Method Summary

Methods

Modifier and Type	Method and Description
static AffineTransformation	createFromBaseLines(Point src0, Point src1, Point dest0, Point dest1) Creates an AffineTransformation defined by a maping between two baselines.
static AffineTransformation	createFromControlVectors(Point[] src, Point[] dest) Creates an AffineTransformation defined by a set of control vectors.
static AffineTransformation	createFromControlVectors(Point src0, Point dest0) Creates an AffineTransformation defined by a single control vector.
static AffineTransformation	createFromControlVectors(Point src0, Point src1, Point dest0, Point dest1) Creates an AffineTransformation defined by a pair of control vectors.
static AffineTransformation	createFromControlVectors(Point src0, Point src1, Point src2, Point dest0, Point dest1, Point dest2) Creates a tranformation from a set of three control vectors.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

AffineTransformationFactory

public AffineTransformationFactory()

Method Detail

createFromBaseLines

public static AffineTransformation createFromBaseLines(Point src0,
                                       Point src1,
                                       Point dest0,
                                       Point dest1)

Creates an AffineTransformation defined by a maping between two baselines. The computed transformation consists of:

• a translation from the start point of the source baseline to the start point of the destination baseline,
• a rotation through the angle between the baselines about the destination start point,
• and a scaling equal to the ratio of the baseline lengths.

If the source baseline has zero length, an identity transformation is returned.

Parameters:

src0 - the start point of the source baseline

src1 - the end point of the source baseline

dest0 - the start point of the destination baseline

dest1 - the end point of the destination baseline

Returns:

the computed transformation

createFromControlVectors

public static AffineTransformation createFromControlVectors(Point src0,
                                            Point dest0)

Creates an AffineTransformation defined by a single control vector. A control vector consists of a source point and a destination point, which is the image of the source point under the desired transformation. This produces a translation.

Parameters:

src0 - the start point of the control vector

dest0 - the end point of the control vector

Returns:

the computed transformation

createFromControlVectors

public static AffineTransformation createFromControlVectors(Point src0,
                                            Point src1,
                                            Point dest0,
                                            Point dest1)

Creates an AffineTransformation defined by a pair of control vectors. A control vector consists of a source point and a destination point, which is the image of the source point under the desired transformation. The computed transformation is a combination of one or more of a uniform scale, a rotation, and a translation (i.e. there is no shear component and no reflection)

Parameters:

src0 -

src1 -

dest0 -

dest1 -

Returns:

the computed transformation

createFromControlVectors

public static AffineTransformation createFromControlVectors(Point src0,
                                            Point src1,
                                            Point src2,
                                            Point dest0,
                                            Point dest1,
                                            Point dest2)

Creates a tranformation from a set of three control vectors. A control vector consists of a source point and a destination point, which is the image of the source point under the desired transformation. Three control vectors allows defining a fully general affine transformation.

Parameters:

src0 -

src1 -

src2 -

dest0 -

dest1 -

dest2 -

Returns:

the computed transformation

createFromControlVectors

public static AffineTransformation createFromControlVectors(Point[] src,
                                            Point[] dest)

Creates an AffineTransformation defined by a set of control vectors. Between one and three vectors must be supplied.

Parameters:

src - the source points of the vectors

dest - the destination points of the vectors

Returns:

the computed transformation

Throws:

IllegalArgumentException - if the control vector arrays are too short, long or of different lengths