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JavaTM 2 Platform Standard Ed. 5.0 |
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java.lang.Objectjava.awt.geom.AffineTransform
public class AffineTransform
The AffineTransform class represents a 2D affine transform
that performs a linear mapping from 2D coordinates to other 2D
coordinates that preserves the "straightness" and
"parallelness" of lines. Affine transformations can be constructed
using sequences of translations, scales, flips, rotations, and shears.
Such a coordinate transformation can be represented by a 3 row by
3 column matrix with an implied last row of [ 0 0 1 ]. This matrix
transforms source coordinates (x, y) into
destination coordinates (x', y') by considering
them to be a column vector and multiplying the coordinate vector
by the matrix according to the following process:
[ x'] [ m00 m01 m02 ] [ x ] [ m00x + m01y + m02 ]
[ y'] = [ m10 m11 m12 ] [ y ] = [ m10x + m11y + m12 ]
[ 1 ] [ 0 0 1 ] [ 1 ] [ 1 ]
| Field Summary | |
|---|---|
static int |
TYPE_FLIP
This flag bit indicates that the transform defined by this object performs a mirror image flip about some axis which changes the normally right handed coordinate system into a left handed system in addition to the conversions indicated by other flag bits. |
static int |
TYPE_GENERAL_ROTATION
This flag bit indicates that the transform defined by this object performs a rotation by an arbitrary angle in addition to the conversions indicated by other flag bits. |
static int |
TYPE_GENERAL_SCALE
This flag bit indicates that the transform defined by this object performs a general scale in addition to the conversions indicated by other flag bits. |
static int |
TYPE_GENERAL_TRANSFORM
This constant indicates that the transform defined by this object performs an arbitrary conversion of the input coordinates. |
static int |
TYPE_IDENTITY
This constant indicates that the transform defined by this object is an identity transform. |
static int |
TYPE_MASK_ROTATION
This constant is a bit mask for any of the rotation flag bits. |
static int |
TYPE_MASK_SCALE
This constant is a bit mask for any of the scale flag bits. |
static int |
TYPE_QUADRANT_ROTATION
This flag bit indicates that the transform defined by this object performs a quadrant rotation by some multiple of 90 degrees in addition to the conversions indicated by other flag bits. |
static int |
TYPE_TRANSLATION
This flag bit indicates that the transform defined by this object performs a translation in addition to the conversions indicated by other flag bits. |
static int |
TYPE_UNIFORM_SCALE
This flag bit indicates that the transform defined by this object performs a uniform scale in addition to the conversions indicated by other flag bits. |
| Constructor Summary | |
|---|---|
AffineTransform()
Constructs a new AffineTransform representing the
Identity transformation. |
|
AffineTransform(AffineTransform Tx)
Constructs a new AffineTransform that is a copy of
the specified AffineTransform object. |
|
AffineTransform(double[] flatmatrix)
Constructs a new AffineTransform from an array of
double precision values representing either the 4 non-translation
entries or the 6 specifiable entries of the 3x3 transformation
matrix. |
|
AffineTransform(double m00,
double m10,
double m01,
double m11,
double m02,
double m12)
Constructs a new AffineTransform from 6 double
precision values representing the 6 specifiable entries of the 3x3
transformation matrix. |
|
AffineTransform(float[] flatmatrix)
Constructs a new AffineTransform from an array of
floating point values representing either the 4 non-translation
enries or the 6 specifiable entries of the 3x3 transformation
matrix. |
|
AffineTransform(float m00,
float m10,
float m01,
float m11,
float m02,
float m12)
Constructs a new AffineTransform from 6 floating point
values representing the 6 specifiable entries of the 3x3
transformation matrix. |
|
| Method Summary | |
|---|---|
Object |
clone()
Returns a copy of this AffineTransform object. |
void |
concatenate(AffineTransform Tx)
Concatenates an AffineTransform Tx to
this AffineTransform Cx in the most commonly useful
way to provide a new user space
that is mapped to the former user space by Tx. |
AffineTransform |
createInverse()
Returns an AffineTransform object representing the
inverse transformation. |
Shape |
createTransformedShape(Shape pSrc)
Returns a new Shape object defined by the geometry of the
specified Shape after it has been transformed by
this transform. |
void |
deltaTransform(double[] srcPts,
int srcOff,
double[] dstPts,
int dstOff,
int numPts)
Transforms an array of relative distance vectors by this transform. |
Point2D |
deltaTransform(Point2D ptSrc,
Point2D ptDst)
Transforms the relative distance vector specified by ptSrc and stores the result in ptDst. |
boolean |
equals(Object obj)
Returns true if this AffineTransform
represents the same affine coordinate transform as the specified
argument. |
double |
getDeterminant()
Returns the determinant of the matrix representation of the transform. |
void |
getMatrix(double[] flatmatrix)
Retrieves the 6 specifiable values in the 3x3 affine transformation matrix and places them into an array of double precisions values. |
static AffineTransform |
getRotateInstance(double theta)
Returns a transform representing a rotation transformation. |
static AffineTransform |
getRotateInstance(double theta,
double x,
double y)
Returns a transform that rotates coordinates around an anchor point. |
static AffineTransform |
getScaleInstance(double sx,
double sy)
Returns a transform representing a scaling transformation. |
double |
getScaleX()
Returns the X coordinate scaling element (m00) of the 3x3 affine transformation matrix. |
double |
getScaleY()
Returns the Y coordinate scaling element (m11) of the 3x3 affine transformation matrix. |
static AffineTransform |
getShearInstance(double shx,
double shy)
Returns a transform representing a shearing transformation. |
double |
getShearX()
Returns the X coordinate shearing element (m01) of the 3x3 affine transformation matrix. |
double |
getShearY()
Returns the Y coordinate shearing element (m10) of the 3x3 affine transformation matrix. |
static AffineTransform |
getTranslateInstance(double tx,
double ty)
Returns a transform representing a translation transformation. |
double |
getTranslateX()
Returns the X coordinate of the translation element (m02) of the 3x3 affine transformation matrix. |
double |
getTranslateY()
Returns the Y coordinate of the translation element (m12) of the 3x3 affine transformation matrix. |
int |
getType()
Retrieves the flag bits describing the conversion properties of this transform. |
int |
hashCode()
Returns the hashcode for this transform. |
void |
inverseTransform(double[] srcPts,
int srcOff,
double[] dstPts,
int dstOff,
int numPts)
Inverse transforms an array of double precision coordinates by this transform. |
Point2D |
inverseTransform(Point2D ptSrc,
Point2D ptDst)
Inverse transforms the specified ptSrc and stores the
result in ptDst. |
boolean |
isIdentity()
Returns true if this AffineTransform is
an identity transform. |
void |
preConcatenate(AffineTransform Tx)
Concatenates an AffineTransform Tx to
this AffineTransform Cx
in a less commonly used way such that Tx modifies the
coordinate transformation relative to the absolute pixel
space rather than relative to the existing user space. |
void |
rotate(double theta)
Concatenates this transform with a rotation transformation. |
void |
rotate(double theta,
double x,
double y)
Concatenates this transform with a transform that rotates coordinates around an anchor point. |
void |
scale(double sx,
double sy)
Concatenates this transform with a scaling transformation. |
void |
setToIdentity()
Resets this transform to the Identity transform. |
void |
setToRotation(double theta)
Sets this transform to a rotation transformation. |
void |
setToRotation(double theta,
double x,
double y)
Sets this transform to a translated rotation transformation. |
void |
setToScale(double sx,
double sy)
Sets this transform to a scaling transformation. |
void |
setToShear(double shx,
double shy)
Sets this transform to a shearing transformation. |
void |
setToTranslation(double tx,
double ty)
Sets this transform to a translation transformation. |
void |
setTransform(AffineTransform Tx)
Sets this transform to a copy of the transform in the specified AffineTransform object. |
void |
setTransform(double m00,
double m10,
double m01,
double m11,
double m02,
double m12)
Sets this transform to the matrix specified by the 6 double precision values. |
void |
shear(double shx,
double shy)
Concatenates this transform with a shearing transformation. |
String |
toString()
Returns a String that represents the value of this
Object. |
void |
transform(double[] srcPts,
int srcOff,
double[] dstPts,
int dstOff,
int numPts)
Transforms an array of double precision coordinates by this transform. |
void |
transform(double[] srcPts,
int srcOff,
float[] dstPts,
int dstOff,
int numPts)
Transforms an array of double precision coordinates by this transform and stores the results into an array of floats. |
void |
transform(float[] srcPts,
int srcOff,
double[] dstPts,
int dstOff,
int numPts)
Transforms an array of floating point coordinates by this transform and stores the results into an array of doubles. |
void |
transform(float[] srcPts,
int srcOff,
float[] dstPts,
int dstOff,
int numPts)
Transforms an array of floating point coordinates by this transform. |
void |
transform(Point2D[] ptSrc,
int srcOff,
Point2D[] ptDst,
int dstOff,
int numPts)
Transforms an array of point objects by this transform. |
Point2D |
transform(Point2D ptSrc,
Point2D ptDst)
Transforms the specified ptSrc and stores the result
in ptDst. |
void |
translate(double tx,
double ty)
Concatenates this transform with a translation transformation. |
| Methods inherited from class java.lang.Object |
|---|
finalize, getClass, notify, notifyAll, wait, wait, wait |
| Field Detail |
|---|
public static final int TYPE_IDENTITY
TYPE_TRANSLATION,
TYPE_UNIFORM_SCALE,
TYPE_GENERAL_SCALE,
TYPE_FLIP,
TYPE_QUADRANT_ROTATION,
TYPE_GENERAL_ROTATION,
TYPE_GENERAL_TRANSFORM,
getType(),
Constant Field Valuespublic static final int TYPE_TRANSLATION
TYPE_IDENTITY,
TYPE_UNIFORM_SCALE,
TYPE_GENERAL_SCALE,
TYPE_FLIP,
TYPE_QUADRANT_ROTATION,
TYPE_GENERAL_ROTATION,
TYPE_GENERAL_TRANSFORM,
getType(),
Constant Field Valuespublic static final int TYPE_UNIFORM_SCALE
TYPE_IDENTITY,
TYPE_TRANSLATION,
TYPE_GENERAL_SCALE,
TYPE_FLIP,
TYPE_QUADRANT_ROTATION,
TYPE_GENERAL_ROTATION,
TYPE_GENERAL_TRANSFORM,
getType(),
Constant Field Valuespublic static final int TYPE_GENERAL_SCALE
TYPE_IDENTITY,
TYPE_TRANSLATION,
TYPE_UNIFORM_SCALE,
TYPE_FLIP,
TYPE_QUADRANT_ROTATION,
TYPE_GENERAL_ROTATION,
TYPE_GENERAL_TRANSFORM,
getType(),
Constant Field Valuespublic static final int TYPE_MASK_SCALE
TYPE_UNIFORM_SCALE,
TYPE_GENERAL_SCALE,
Constant Field Valuespublic static final int TYPE_FLIP
TYPE_IDENTITY,
TYPE_TRANSLATION,
TYPE_UNIFORM_SCALE,
TYPE_GENERAL_SCALE,
TYPE_QUADRANT_ROTATION,
TYPE_GENERAL_ROTATION,
TYPE_GENERAL_TRANSFORM,
getType(),
Constant Field Valuespublic static final int TYPE_QUADRANT_ROTATION
TYPE_IDENTITY,
TYPE_TRANSLATION,
TYPE_UNIFORM_SCALE,
TYPE_GENERAL_SCALE,
TYPE_FLIP,
TYPE_GENERAL_ROTATION,
TYPE_GENERAL_TRANSFORM,
getType(),
Constant Field Valuespublic static final int TYPE_GENERAL_ROTATION
TYPE_IDENTITY,
TYPE_TRANSLATION,
TYPE_UNIFORM_SCALE,
TYPE_GENERAL_SCALE,
TYPE_FLIP,
TYPE_QUADRANT_ROTATION,
TYPE_GENERAL_TRANSFORM,
getType(),
Constant Field Valuespublic static final int TYPE_MASK_ROTATION
TYPE_QUADRANT_ROTATION,
TYPE_GENERAL_ROTATION,
Constant Field Valuespublic static final int TYPE_GENERAL_TRANSFORM
TYPE_IDENTITY,
TYPE_TRANSLATION,
TYPE_UNIFORM_SCALE,
TYPE_GENERAL_SCALE,
TYPE_FLIP,
TYPE_QUADRANT_ROTATION,
TYPE_GENERAL_ROTATION,
getType(),
Constant Field Values| Constructor Detail |
|---|
public AffineTransform()
AffineTransform representing the
Identity transformation.
public AffineTransform(AffineTransform Tx)
AffineTransform that is a copy of
the specified AffineTransform object.
Tx - the AffineTransform object to copy
public AffineTransform(float m00,
float m10,
float m01,
float m11,
float m02,
float m12)
AffineTransform from 6 floating point
values representing the 6 specifiable entries of the 3x3
transformation matrix.
m00, m01, m02, m10, m11, m12 - the
6 floating point values that compose the 3x3 transformation matrixpublic AffineTransform(float[] flatmatrix)
AffineTransform from an array of
floating point values representing either the 4 non-translation
enries or the 6 specifiable entries of the 3x3 transformation
matrix. The values are retrieved from the array as
{ m00 m10 m01 m11 [m02 m12]}.
flatmatrix - the float array containing the values to be set
in the new AffineTransform object. The length of the
array is assumed to be at least 4. If the length of the array is
less than 6, only the first 4 values are taken. If the length of
the array is greater than 6, the first 6 values are taken.
public AffineTransform(double m00,
double m10,
double m01,
double m11,
double m02,
double m12)
AffineTransform from 6 double
precision values representing the 6 specifiable entries of the 3x3
transformation matrix.
m00, m01, m02, m10, m11, m12 - the
6 floating point values that compose the 3x3 transformation matrixpublic AffineTransform(double[] flatmatrix)
AffineTransform from an array of
double precision values representing either the 4 non-translation
entries or the 6 specifiable entries of the 3x3 transformation
matrix. The values are retrieved from the array as
{ m00 m10 m01 m11 [m02 m12]}.
flatmatrix - the double array containing the values to be set
in the new AffineTransform object. The length of the
array is assumed to be at least 4. If the length of the array is
less than 6, only the first 4 values are taken. If the length of
the array is greater than 6, the first 6 values are taken.| Method Detail |
|---|
public static AffineTransform getTranslateInstance(double tx,
double ty)
[ 1 0 tx ]
[ 0 1 ty ]
[ 0 0 1 ]
tx - the distance by which coordinates are translated in the
X axis directionty - the distance by which coordinates are translated in the
Y axis direction
AffineTransform object that represents a
translation transformation, created with the specified vector.public static AffineTransform getRotateInstance(double theta)
[ cos(theta) -sin(theta) 0 ]
[ sin(theta) cos(theta) 0 ]
[ 0 0 1 ]
Rotating with a positive angle theta rotates points on the positive
x axis toward the positive y axis.
theta - the angle of rotation in radians
AffineTransform object that is a rotation
transformation, created with the specified angle of rotation.
public static AffineTransform getRotateInstance(double theta,
double x,
double y)
This operation is equivalent to the following sequence of calls:
AffineTransform Tx = new AffineTransform();
Tx.setToTranslation(x, y); // S3: final translation
Tx.rotate(theta); // S2: rotate around anchor
Tx.translate(-x, -y); // S1: translate anchor to origin
The matrix representing the returned transform is:
[ cos(theta) -sin(theta) x-x*cos+y*sin ]
[ sin(theta) cos(theta) y-x*sin-y*cos ]
[ 0 0 1 ]
Rotating with a positive angle theta rotates points on the positive
x axis toward the positive y axis.
theta - the angle of rotation in radiansx, y - the coordinates of the anchor point of the
rotation
AffineTransform object that rotates
coordinates around the specified point by the specified angle of
rotation.
public static AffineTransform getScaleInstance(double sx,
double sy)
[ sx 0 0 ]
[ 0 sy 0 ]
[ 0 0 1 ]
sx - the factor by which coordinates are scaled along the
X axis directionsy - the factor by which coordinates are scaled along the
Y axis direction
AffineTransform object that scales
coordinates by the specified factors.
public static AffineTransform getShearInstance(double shx,
double shy)
[ 1 shx 0 ]
[ shy 1 0 ]
[ 0 0 1 ]
shx - the multiplier by which coordinates are shifted in the
direction of the positive X axis as a factor of their Y coordinateshy - the multiplier by which coordinates are shifted in the
direction of the positive Y axis as a factor of their X coordinate
AffineTransform object that shears
coordinates by the specified multipliers.public int getType()
TYPE_IDENTITY,
TYPE_TRANSLATION,
TYPE_UNIFORM_SCALE,
TYPE_GENERAL_SCALE,
TYPE_QUADRANT_ROTATION,
TYPE_GENERAL_ROTATION,
TYPE_GENERAL_TRANSFORMpublic double getDeterminant()
If the determinant is non-zero, then this transform is
invertible and the various methods that depend on the inverse
transform do not need to throw a
NoninvertibleTransformException.
If the determinant is zero then this transform can not be
inverted since the transform maps all input coordinates onto
a line or a point.
If the determinant is near enough to zero then inverse transform
operations might not carry enough precision to produce meaningful
results.
If this transform represents a uniform scale, as indicated by
the getType method then the determinant also
represents the square of the uniform scale factor by which all of
the points are expanded from or contracted towards the origin.
If this transform represents a non-uniform scale or more general
transform then the determinant is not likely to represent a
value useful for any purpose other than determining if inverse
transforms are possible.
Mathematically, the determinant is calculated using the formula:
| m00 m01 m02 |
| m10 m11 m12 | = m00 * m11 - m01 * m10
| 0 0 1 |
getType(),
createInverse(),
inverseTransform(java.awt.geom.Point2D, java.awt.geom.Point2D),
TYPE_UNIFORM_SCALEpublic void getMatrix(double[] flatmatrix)
flatmatrix - the double array used to store the returned
values.getScaleX(),
getScaleY(),
getShearX(),
getShearY(),
getTranslateX(),
getTranslateY()public double getScaleX()
getMatrix(double[])public double getScaleY()
getMatrix(double[])public double getShearX()
getMatrix(double[])public double getShearY()
getMatrix(double[])public double getTranslateX()
getMatrix(double[])public double getTranslateY()
getMatrix(double[])
public void translate(double tx,
double ty)
AffineTransform represented by the following matrix:
[ 1 0 tx ]
[ 0 1 ty ]
[ 0 0 1 ]
tx - the distance by which coordinates are translated in the
X axis directionty - the distance by which coordinates are translated in the
Y axis directionpublic void rotate(double theta)
AffineTransform represented by the following matrix:
[ cos(theta) -sin(theta) 0 ]
[ sin(theta) cos(theta) 0 ]
[ 0 0 1 ]
Rotating with a positive angle theta rotates points on the positive
x axis toward the positive y axis.
theta - the angle of rotation in radians
public void rotate(double theta,
double x,
double y)
This operation is equivalent to the following sequence of calls:
translate(x, y); // S3: final translation
rotate(theta); // S2: rotate around anchor
translate(-x, -y); // S1: translate anchor to origin
Rotating with a positive angle theta rotates points on the positive
x axis toward the positive y axis.
theta - the angle of rotation in radiansx, y - the coordinates of the anchor point of the
rotation
public void scale(double sx,
double sy)
AffineTransform represented by the following matrix:
[ sx 0 0 ]
[ 0 sy 0 ]
[ 0 0 1 ]
sx - the factor by which coordinates are scaled along the
X axis directionsy - the factor by which coordinates are scaled along the
Y axis direction
public void shear(double shx,
double shy)
AffineTransform represented by the following matrix:
[ 1 shx 0 ]
[ shy 1 0 ]
[ 0 0 1 ]
shx - the multiplier by which coordinates are shifted in the
direction of the positive X axis as a factor of their Y coordinateshy - the multiplier by which coordinates are shifted in the
direction of the positive Y axis as a factor of their X coordinatepublic void setToIdentity()
public void setToTranslation(double tx,
double ty)
[ 1 0 tx ]
[ 0 1 ty ]
[ 0 0 1 ]
tx - the distance by which coordinates are translated in the
X axis directionty - the distance by which coordinates are translated in the
Y axis directionpublic void setToRotation(double theta)
[ cos(theta) -sin(theta) 0 ]
[ sin(theta) cos(theta) 0 ]
[ 0 0 1 ]
Rotating with a positive angle theta rotates points on the positive
x axis toward the positive y axis.
theta - the angle of rotation in radians
public void setToRotation(double theta,
double x,
double y)
This operation is equivalent to the following sequence of calls:
setToTranslation(x, y); // S3: final translation
rotate(theta); // S2: rotate around anchor
translate(-x, -y); // S1: translate anchor to origin
The matrix representing this transform becomes:
[ cos(theta) -sin(theta) x-x*cos+y*sin ]
[ sin(theta) cos(theta) y-x*sin-y*cos ]
[ 0 0 1 ]
Rotating with a positive angle theta rotates points on the positive
x axis toward the positive y axis.
theta - the angle of rotation in radiansx, y - the coordinates of the anchor point of the
rotation
public void setToScale(double sx,
double sy)
[ sx 0 0 ]
[ 0 sy 0 ]
[ 0 0 1 ]
sx - the factor by which coordinates are scaled along the
X axis directionsy - the factor by which coordinates are scaled along the
Y axis direction
public void setToShear(double shx,
double shy)
[ 1 shx 0 ]
[ shy 1 0 ]
[ 0 0 1 ]
shx - the multiplier by which coordinates are shifted in the
direction of the positive X axis as a factor of their Y coordinateshy - the multiplier by which coordinates are shifted in the
direction of the positive Y axis as a factor of their X coordinatepublic void setTransform(AffineTransform Tx)
AffineTransform object.
Tx - the AffineTransform object from which to
copy the transform
public void setTransform(double m00,
double m10,
double m01,
double m11,
double m02,
double m12)
m00, m01, m02, m10, m11, m12 - the
6 floating point values that compose the 3x3 transformation matrixpublic void concatenate(AffineTransform Tx)
AffineTransform Tx to
this AffineTransform Cx in the most commonly useful
way to provide a new user space
that is mapped to the former user space by Tx.
Cx is updated to perform the combined transformation.
Transforming a point p by the updated transform Cx' is
equivalent to first transforming p by Tx and then
transforming the result by the original transform Cx like this:
Cx'(p) = Cx(Tx(p))
In matrix notation, if this transform Cx is
represented by the matrix [this] and Tx is represented
by the matrix [Tx] then this method does the following:
[this] = [this] x [Tx]
Tx - the AffineTransform object to be
concatenated with this AffineTransform object.preConcatenate(java.awt.geom.AffineTransform)public void preConcatenate(AffineTransform Tx)
AffineTransform Tx to
this AffineTransform Cx
in a less commonly used way such that Tx modifies the
coordinate transformation relative to the absolute pixel
space rather than relative to the existing user space.
Cx is updated to perform the combined transformation.
Transforming a point p by the updated transform Cx' is
equivalent to first transforming p by the original transform
Cx and then transforming the result by
Tx like this:
Cx'(p) = Tx(Cx(p))
In matrix notation, if this transform Cx
is represented by the matrix [this] and Tx is
represented by the matrix [Tx] then this method does the
following:
[this] = [Tx] x [this]
Tx - the AffineTransform object to be
concatenated with this AffineTransform object.concatenate(java.awt.geom.AffineTransform)
public AffineTransform createInverse()
throws NoninvertibleTransformException
AffineTransform object representing the
inverse transformation.
The inverse transform Tx' of this transform Tx
maps coordinates transformed by Tx back
to their original coordinates.
In other words, Tx'(Tx(p)) = p = Tx(Tx'(p)).
If this transform maps all coordinates onto a point or a line
then it will not have an inverse, since coordinates that do
not lie on the destination point or line will not have an inverse
mapping.
The getDeterminant method can be used to determine if this
transform has no inverse, in which case an exception will be
thrown if the createInverse method is called.
AffineTransform object representing the
inverse transformation.
NoninvertibleTransformException - if the matrix cannot be inverted.getDeterminant()
public Point2D transform(Point2D ptSrc,
Point2D ptDst)
ptSrc and stores the result
in ptDst.
If ptDst is null, a new Point2D
object is allocated and then the result of the transformation is
stored in this object.
In either case, ptDst, which contains the
transformed point, is returned for convenience.
If ptSrc and ptDst are the same
object, the input point is correctly overwritten with
the transformed point.
ptSrc - the specified Point2D to be transformedptDst - the specified Point2D that stores the
result of transforming ptSrc
ptDst after transforming
ptSrc and stroring the result in ptDst.
public void transform(Point2D[] ptSrc,
int srcOff,
Point2D[] ptDst,
int dstOff,
int numPts)
ptDst array is
null, a new Point2D object is allocated
and stored into that element before storing the results of the
transformation.
Note that this method does not take any precautions to
avoid problems caused by storing results into Point2D
objects that will be used as the source for calculations
further down the source array.
This method does guarantee that if a specified Point2D
object is both the source and destination for the same single point
transform operation then the results will not be stored until
the calculations are complete to avoid storing the results on
top of the operands.
If, however, the destination Point2D object for one
operation is the same object as the source Point2D
object for another operation further down the source array then
the original coordinates in that point are overwritten before
they can be converted.
ptSrc - the array containing the source point objectsptDst - the array into which the transform point objects are
returnedsrcOff - the offset to the first point object to be
transformed in the source arraydstOff - the offset to the location of the first
transformed point object that is stored in the destination arraynumPts - the number of point objects to be transformed
public void transform(float[] srcPts,
int srcOff,
float[] dstPts,
int dstOff,
int numPts)
[x0, y0, x1, y1, ..., xn, yn].
srcPts - the array containing the source point coordinates.
Each point is stored as a pair of x, y coordinates.dstPts - the array into which the transformed point coordinates
are returned. Each point is stored as a pair of x, y
coordinates.srcOff - the offset to the first point to be transformed
in the source arraydstOff - the offset to the location of the first
transformed point that is stored in the destination arraynumPts - the number of points to be transformed
public void transform(double[] srcPts,
int srcOff,
double[] dstPts,
int dstOff,
int numPts)
[x0, y0, x1, y1, ..., xn, yn].
srcPts - the array containing the source point coordinates.
Each point is stored as a pair of x, y coordinates.dstPts - the array into which the transformed point
coordinates are returned. Each point is stored as a pair of
x, y coordinates.srcOff - the offset to the first point to be transformed
in the source arraydstOff - the offset to the location of the first
transformed point that is stored in the destination arraynumPts - the number of point objects to be transformed
public void transform(float[] srcPts,
int srcOff,
double[] dstPts,
int dstOff,
int numPts)
[x0, y0, x1, y1, ..., xn, yn].
srcPts - the array containing the source point coordinates.
Each point is stored as a pair of x, y coordinates.dstPts - the array into which the transformed point coordinates
are returned. Each point is stored as a pair of x, y
coordinates.srcOff - the offset to the first point to be transformed
in the source arraydstOff - the offset to the location of the first
transformed point that is stored in the destination arraynumPts - the number of points to be transformed
public void transform(double[] srcPts,
int srcOff,
float[] dstPts,
int dstOff,
int numPts)
[x0, y0, x1, y1, ..., xn, yn].
srcPts - the array containing the source point coordinates.
Each point is stored as a pair of x, y coordinates.dstPts - the array into which the transformed point
coordinates are returned. Each point is stored as a pair of
x, y coordinates.srcOff - the offset to the first point to be transformed
in the source arraydstOff - the offset to the location of the first
transformed point that is stored in the destination arraynumPts - the number of point objects to be transformed
public Point2D inverseTransform(Point2D ptSrc,
Point2D ptDst)
throws NoninvertibleTransformException
ptSrc and stores the
result in ptDst.
If ptDst is null, a new
Point2D object is allocated and then the result of the
transform is stored in this object.
In either case, ptDst, which contains the transformed
point, is returned for convenience.
If ptSrc and ptDst are the same
object, the input point is correctly overwritten with the
transformed point.
ptSrc - the point to be inverse transformedptDst - the resulting transformed point
ptDst, which contains the result of the
inverse transform.
NoninvertibleTransformException - if the matrix cannot be
inverted.
public void inverseTransform(double[] srcPts,
int srcOff,
double[] dstPts,
int dstOff,
int numPts)
throws NoninvertibleTransformException
[x0, y0, x1, y1, ..., xn, yn].
srcPts - the array containing the source point coordinates.
Each point is stored as a pair of x, y coordinates.dstPts - the array into which the transformed point
coordinates are returned. Each point is stored as a pair of
x, y coordinates.srcOff - the offset to the first point to be transformed
in the source arraydstOff - the offset to the location of the first
transformed point that is stored in the destination arraynumPts - the number of point objects to be transformed
NoninvertibleTransformException - if the matrix cannot be
inverted.
public Point2D deltaTransform(Point2D ptSrc,
Point2D ptDst)
ptSrc and stores the result in ptDst.
A relative distance vector is transformed without applying the
translation components of the affine transformation matrix
using the following equations:
[ x' ] [ m00 m01 (m02) ] [ x ] [ m00x + m01y ]
[ y' ] = [ m10 m11 (m12) ] [ y ] = [ m10x + m11y ]
[ (1) ] [ (0) (0) ( 1 ) ] [ (1) ] [ (1) ]
If ptDst is null, a new
Point2D object is allocated and then the result of the
transform is stored in this object.
In either case, ptDst, which contains the
transformed point, is returned for convenience.
If ptSrc and ptDst are the same object,
the input point is correctly overwritten with the transformed
point.
ptSrc - the distance vector to be delta transformedptDst - the resulting transformed distance vector
ptDst, which contains the result of the
transformation.
public void deltaTransform(double[] srcPts,
int srcOff,
double[] dstPts,
int dstOff,
int numPts)
[ x' ] [ m00 m01 (m02) ] [ x ] [ m00x + m01y ]
[ y' ] = [ m10 m11 (m12) ] [ y ] = [ m10x + m11y ]
[ (1) ] [ (0) (0) ( 1 ) ] [ (1) ] [ (1) ]
The two coordinate array sections can be exactly the same or
can be overlapping sections of the same array without affecting the
validity of the results.
This method ensures that no source coordinates are
overwritten by a previous operation before they can be transformed.
The coordinates are stored in the arrays starting at the indicated
offset in the order [x0, y0, x1, y1, ..., xn, yn].
srcPts - the array containing the source distance vectors.
Each vector is stored as a pair of relative x, y coordinates.dstPts - the array into which the transformed distance vectors
are returned. Each vector is stored as a pair of relative
x, y coordinates.srcOff - the offset to the first vector to be transformed
in the source arraydstOff - the offset to the location of the first
transformed vector that is stored in the destination arraynumPts - the number of vector coordinate pairs to be
transformedpublic Shape createTransformedShape(Shape pSrc)
Shape object defined by the geometry of the
specified Shape after it has been transformed by
this transform.
pSrc - the specified Shape object to be
transformed by this transform.
Shape object that defines the geometry
of the transformed Shape.public String toString()
String that represents the value of this
Object.
toString in class ObjectString representing the value of this
Object.public boolean isIdentity()
true if this AffineTransform is
an identity transform.
true if this AffineTransform is
an identity transform; false otherwise.public Object clone()
AffineTransform object.
clone in class ObjectObject that is a copy of this
AffineTransform object.Cloneablepublic int hashCode()
hashCode in class ObjectObject.equals(java.lang.Object),
Hashtablepublic boolean equals(Object obj)
true if this AffineTransform
represents the same affine coordinate transform as the specified
argument.
equals in class Objectobj - the Object to test for equality with this
AffineTransform
true if obj equals this
AffineTransform object; false otherwise.Object.hashCode(),
Hashtable
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Copyright 2004 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy.