| java.lang.Object | |
| ↳ | android.graphics.Matrix |
The Matrix class holds a 3x3 matrix for transforming coordinates.
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| Matrix.ScaleToFit | Controlls how the src rect should align into the dst rect for setRectToRect(). | ||||||||||
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| int | MPERSP_0 | ||||||||||
| int | MPERSP_1 | ||||||||||
| int | MPERSP_2 | ||||||||||
| int | MSCALE_X | ||||||||||
| int | MSCALE_Y | ||||||||||
| int | MSKEW_X | ||||||||||
| int | MSKEW_Y | ||||||||||
| int | MTRANS_X | ||||||||||
| int | MTRANS_Y | ||||||||||
| Public Constructors | |||||||||||
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Create an identity matrix
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Create a matrix that is a (deep) copy of src
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| Public Methods | |||||||||||
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Returns true iff obj is a Matrix and its values equal our values.
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Copy 9 values from the matrix into the array.
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Returns an integer hash code for this object.
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If this matrix can be inverted, return true and if inverse is not null,
set inverse to be the inverse of this matrix.
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Gets whether this matrix is affine.
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Returns true if the matrix is identity.
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Apply this matrix to the array of 2D points, and write the transformed
points back into the array
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Apply this matrix to the array of 2D points specified by src, and write
the transformed points into the array of points specified by dst.
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Apply this matrix to the array of 2D points specified by src, and write
the transformed points into the array of points specified by dst.
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Return the mean radius of a circle after it has been mapped by
this matrix.
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Apply this matrix to the src rectangle, and write the transformed
rectangle into dst.
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Apply this matrix to the rectangle, and write the transformed rectangle
back into it.
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Apply this matrix to the array of 2D vectors specified by src, and write
the transformed vectors into the array of vectors specified by dst.
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Apply this matrix to the array of 2D vectors, and write the transformed
vectors back into the array.
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Apply this matrix to the array of 2D vectors specified by src, and write
the transformed vectors into the array of vectors specified by dst.
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Postconcats the matrix with the specified matrix.
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Postconcats the matrix with the specified rotation.
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Postconcats the matrix with the specified rotation.
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Postconcats the matrix with the specified scale.
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Postconcats the matrix with the specified scale.
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Postconcats the matrix with the specified skew.
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Postconcats the matrix with the specified skew.
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Postconcats the matrix with the specified translation.
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Preconcats the matrix with the specified matrix.
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Preconcats the matrix with the specified rotation.
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Preconcats the matrix with the specified rotation.
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Preconcats the matrix with the specified scale.
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Preconcats the matrix with the specified scale.
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Preconcats the matrix with the specified skew.
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Preconcats the matrix with the specified skew.
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Preconcats the matrix with the specified translation.
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Returns true if will map a rectangle to another rectangle.
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Set the matrix to identity
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(deep) copy the src matrix into this matrix.
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Set the matrix to the concatenation of the two specified matrices and
return true.
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Set the matrix such that the specified src points would map to the
specified dst points.
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Set the matrix to the scale and translate values that map the source
rectangle to the destination rectangle, returning true if the the result
can be represented.
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Set the matrix to rotate about (0,0) by the specified number of degrees.
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Set the matrix to rotate by the specified number of degrees, with a pivot
point at (px, py).
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Set the matrix to scale by sx and sy, with a pivot point at (px, py).
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Set the matrix to scale by sx and sy.
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Set the matrix to rotate by the specified sine and cosine values.
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Set the matrix to rotate by the specified sine and cosine values, with a
pivot point at (px, py).
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Set the matrix to skew by sx and sy, with a pivot point at (px, py).
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Set the matrix to skew by sx and sy.
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Set the matrix to translate by (dx, dy).
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Copy 9 values from the array into the matrix.
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Returns a string containing a concise, human-readable description of this
object.
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| Protected Methods | |||||||||||
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Invoked when the garbage collector has detected that this instance is no longer reachable.
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[Expand]
Inherited Methods | |||||||||||
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From class
java.lang.Object
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Create a matrix that is a (deep) copy of src
| src | The matrix to copy into this matrix |
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Returns true iff obj is a Matrix and its values equal our values.
| obj | the object to compare this instance with. |
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Developers
true if the specified object is equal to this Object; false otherwise.Copy 9 values from the matrix into the array.
Returns an integer hash code for this object. By contract, any two
objects for which equals(Object) returns true must return
the same hash code value. This means that subclasses of Object
usually override both methods or neither method.
Note that hash values must not change over time unless information used in equals comparisons also changes.
See Writing a correct
hashCode method
if you intend implementing your own hashCode method.
If this matrix can be inverted, return true and if inverse is not null, set inverse to be the inverse of this matrix. If this matrix cannot be inverted, ignore inverse and return false.
Gets whether this matrix is affine. An affine matrix preserves straight lines and has no perspective.
Returns true if the matrix is identity. This maybe faster than testing if (getType() == 0)
Apply this matrix to the array of 2D points, and write the transformed points back into the array
| pts | The array [x0, y0, x1, y1, ...] of points to transform. |
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Apply this matrix to the array of 2D points specified by src, and write the transformed points into the array of points specified by dst. The two arrays represent their "points" as pairs of floats [x, y].
| dst | The array of dst points (x,y pairs) |
|---|---|
| dstIndex | The index of the first [x,y] pair of dst floats |
| src | The array of src points (x,y pairs) |
| srcIndex | The index of the first [x,y] pair of src floats |
| pointCount | The number of points (x,y pairs) to transform |
Apply this matrix to the array of 2D points specified by src, and write the transformed points into the array of points specified by dst. The two arrays represent their "points" as pairs of floats [x, y].
| dst | The array of dst points (x,y pairs) |
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| src | The array of src points (x,y pairs) |
Return the mean radius of a circle after it has been mapped by this matrix. NOTE: in perspective this value assumes the circle has its center at the origin.
Apply this matrix to the src rectangle, and write the transformed rectangle into dst. This is accomplished by transforming the 4 corners of src, and then setting dst to the bounds of those points.
| dst | Where the transformed rectangle is written. |
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| src | The original rectangle to be transformed. |
Apply this matrix to the rectangle, and write the transformed rectangle back into it. This is accomplished by transforming the 4 corners of rect, and then setting it to the bounds of those points
| rect | The rectangle to transform. |
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Apply this matrix to the array of 2D vectors specified by src, and write
the transformed vectors into the array of vectors specified by dst. The
two arrays represent their "vectors" as pairs of floats [x, y].
Note: this method does not apply the translation associated with the matrix. Use
mapPoints(float[], float[]) if you want the translation to be applied.
| dst | The array of dst vectors (x,y pairs) |
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| src | The array of src vectors (x,y pairs) |
Apply this matrix to the array of 2D vectors, and write the transformed
vectors back into the array.
Note: this method does not apply the translation associated with the matrix. Use
mapPoints(float[]) if you want the translation to be applied.
| vecs | The array [x0, y0, x1, y1, ...] of vectors to transform. |
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Apply this matrix to the array of 2D vectors specified by src, and write
the transformed vectors into the array of vectors specified by dst. The
two arrays represent their "vectors" as pairs of floats [x, y].
Note: this method does not apply the translation associated with the matrix. Use
mapPoints(float[], int, float[], int, int) if you want the translation
to be applied.
| dst | The array of dst vectors (x,y pairs) |
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| dstIndex | The index of the first [x,y] pair of dst floats |
| src | The array of src vectors (x,y pairs) |
| srcIndex | The index of the first [x,y] pair of src floats |
| vectorCount | The number of vectors (x,y pairs) to transform |
Postconcats the matrix with the specified matrix. M' = other * M
Postconcats the matrix with the specified rotation. M' = R(degrees) * M
Postconcats the matrix with the specified rotation. M' = R(degrees, px, py) * M
Postconcats the matrix with the specified scale. M' = S(sx, sy) * M
Postconcats the matrix with the specified scale. M' = S(sx, sy, px, py) * M
Postconcats the matrix with the specified skew. M' = K(kx, ky, px, py) * M
Postconcats the matrix with the specified skew. M' = K(kx, ky) * M
Postconcats the matrix with the specified translation. M' = T(dx, dy) * M
Preconcats the matrix with the specified matrix. M' = M * other
Preconcats the matrix with the specified rotation. M' = M * R(degrees)
Preconcats the matrix with the specified rotation. M' = M * R(degrees, px, py)
Preconcats the matrix with the specified scale. M' = M * S(sx, sy)
Preconcats the matrix with the specified scale. M' = M * S(sx, sy, px, py)
Preconcats the matrix with the specified skew. M' = M * K(kx, ky, px, py)
Preconcats the matrix with the specified skew. M' = M * K(kx, ky)
Preconcats the matrix with the specified translation. M' = M * T(dx, dy)
Returns true if will map a rectangle to another rectangle. This can be true if the matrix is identity, scale-only, or rotates a multiple of 90 degrees.
(deep) copy the src matrix into this matrix. If src is null, reset this matrix to the identity matrix.
Set the matrix to the concatenation of the two specified matrices and return true.
Either of the two matrices may also be the target matrix, that is
matrixA.setConcat(matrixA, matrixB); is valid.
In GINGERBREAD_MR1 and below, this
function returns true only if the result can be represented. In
HONEYCOMB and above, it always returns true.
Set the matrix such that the specified src points would map to the specified dst points. The "points" are represented as an array of floats, order [x0, y0, x1, y1, ...], where each "point" is 2 float values.
| src | The array of src [x,y] pairs (points) |
|---|---|
| srcIndex | Index of the first pair of src values |
| dst | The array of dst [x,y] pairs (points) |
| dstIndex | Index of the first pair of dst values |
| pointCount | The number of pairs/points to be used. Must be [0..4] |
Set the matrix to the scale and translate values that map the source rectangle to the destination rectangle, returning true if the the result can be represented.
| src | the source rectangle to map from. |
|---|---|
| dst | the destination rectangle to map to. |
| stf | the ScaleToFit option |
Set the matrix to rotate about (0,0) by the specified number of degrees.
Set the matrix to rotate by the specified number of degrees, with a pivot point at (px, py). The pivot point is the coordinate that should remain unchanged by the specified transformation.
Set the matrix to scale by sx and sy, with a pivot point at (px, py). The pivot point is the coordinate that should remain unchanged by the specified transformation.
Set the matrix to scale by sx and sy.
Set the matrix to rotate by the specified sine and cosine values.
Set the matrix to rotate by the specified sine and cosine values, with a pivot point at (px, py). The pivot point is the coordinate that should remain unchanged by the specified transformation.
Set the matrix to skew by sx and sy, with a pivot point at (px, py). The pivot point is the coordinate that should remain unchanged by the specified transformation.
Set the matrix to translate by (dx, dy).
Copy 9 values from the array into the matrix. Depending on the implementation of Matrix, these may be transformed into 16.16 integers in the Matrix, such that a subsequent call to getValues() will not yield exactly the same values.
Returns a string containing a concise, human-readable description of this object. Subclasses are encouraged to override this method and provide an implementation that takes into account the object's type and data. The default implementation is equivalent to the following expression:
getClass().getName() + '@' + Integer.toHexString(hashCode())
See Writing a useful
toString method
if you intend implementing your own toString method.
Invoked when the garbage collector has detected that this instance is no longer reachable. The default implementation does nothing, but this method can be overridden to free resources.
Note that objects that override finalize are significantly more expensive than
objects that don't. Finalizers may be run a long time after the object is no longer
reachable, depending on memory pressure, so it's a bad idea to rely on them for cleanup.
Note also that finalizers are run on a single VM-wide finalizer thread,
so doing blocking work in a finalizer is a bad idea. A finalizer is usually only necessary
for a class that has a native peer and needs to call a native method to destroy that peer.
Even then, it's better to provide an explicit close method (and implement
Closeable), and insist that callers manually dispose of instances. This
works well for something like files, but less well for something like a BigInteger
where typical calling code would have to deal with lots of temporaries. Unfortunately,
code that creates lots of temporaries is the worst kind of code from the point of view of
the single finalizer thread.
If you must use finalizers, consider at least providing your own
ReferenceQueue and having your own thread process that queue.
Unlike constructors, finalizers are not automatically chained. You are responsible for
calling super.finalize() yourself.
Uncaught exceptions thrown by finalizers are ignored and do not terminate the finalizer thread. See Effective Java Item 7, "Avoid finalizers" for more.
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