Matrix

MPERSP_0

int MPERSP_0

Constant Value: 6 (0x00000006)

MPERSP_1

int MPERSP_1

Constant Value: 7 (0x00000007)

MPERSP_2

int MPERSP_2

Constant Value: 8 (0x00000008)

MSCALE_X

int MSCALE_X

Constant Value: 0 (0x00000000)

MSCALE_Y

int MSCALE_Y

Constant Value: 4 (0x00000004)

MSKEW_X

int MSKEW_X

Constant Value: 1 (0x00000001)

MSKEW_Y

int MSKEW_Y

Constant Value: 3 (0x00000003)

MTRANS_X

int MTRANS_X

Constant Value: 2 (0x00000002)

MTRANS_Y

int MTRANS_Y

Constant Value: 5 (0x00000005)

Matrix

Matrix ()

Create an identity matrix

Matrix

Matrix (Matrix src)

Create a matrix that is a (deep) copy of src

equals

boolean equals (Object obj)

Returns true iff obj is a Matrix and its values equal our values.

getValues

void getValues (float[] values)

Copy 9 values from the matrix into the array.

hashCode

int hashCode ()

Returns a hash code value for the object. This method is supported for the benefit of hash tables such as those provided by HashMap.

The general contract of hashCode is:

• Whenever it is invoked on the same object more than once during an execution of a Java application, the hashCode method must consistently return the same integer, provided no information used in equals comparisons on the object is modified. This integer need not remain consistent from one execution of an application to another execution of the same application.
• If two objects are equal according to the equals(Object) method, then calling the hashCode method on each of the two objects must produce the same integer result.
• It is not required that if two objects are unequal according to the equals(java.lang.Object) method, then calling the hashCode method on each of the two objects must produce distinct integer results. However, the programmer should be aware that producing distinct integer results for unequal objects may improve the performance of hash tables.

As much as is reasonably practical, the hashCode method defined by class Object does return distinct integers for distinct objects. (This is typically implemented by converting the internal address of the object into an integer, but this implementation technique is not required by the Java™ programming language.)

invert

boolean invert (Matrix inverse)

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.

isAffine

boolean isAffine ()

Gets whether this matrix is affine. An affine matrix preserves straight lines and has no perspective.

isIdentity

boolean isIdentity ()

Returns true if the matrix is identity. This maybe faster than testing if (getType() == 0)

mapPoints

void mapPoints (float[] dst, 
                int dstIndex, 
                float[] src, 
                int srcIndex, 
                int pointCount)

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].

mapPoints

void mapPoints (float[] dst, 
                float[] src)

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].

mapPoints

void mapPoints (float[] pts)

Apply this matrix to the array of 2D points, and write the transformed points back into the array

mapRadius

float mapRadius (float radius)

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.

mapRect

boolean mapRect (RectF rect)

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

mapRect

boolean mapRect (RectF dst, 
                RectF src)

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.

mapVectors

void mapVectors (float[] vecs)

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.

mapVectors

void mapVectors (float[] dst, 
                int dstIndex, 
                float[] src, 
                int srcIndex, 
                int vectorCount)

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.

mapVectors

void mapVectors (float[] dst, 
                float[] src)

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.

postConcat

boolean postConcat (Matrix other)

Postconcats the matrix with the specified matrix. M' = other * M

postRotate

boolean postRotate (float degrees, 
                float px, 
                float py)

Postconcats the matrix with the specified rotation. M' = R(degrees, px, py) * M

postRotate

boolean postRotate (float degrees)

Postconcats the matrix with the specified rotation. M' = R(degrees) * M

postScale

boolean postScale (float sx, 
                float sy, 
                float px, 
                float py)

Postconcats the matrix with the specified scale. M' = S(sx, sy, px, py) * M

postScale

boolean postScale (float sx, 
                float sy)

Postconcats the matrix with the specified scale. M' = S(sx, sy) * M

postSkew

boolean postSkew (float kx, 
                float ky)

Postconcats the matrix with the specified skew. M' = K(kx, ky) * M

postSkew

boolean postSkew (float kx, 
                float ky, 
                float px, 
                float py)

Postconcats the matrix with the specified skew. M' = K(kx, ky, px, py) * M

postTranslate

boolean postTranslate (float dx, 
                float dy)

Postconcats the matrix with the specified translation. M' = T(dx, dy) * M

preConcat

boolean preConcat (Matrix other)

Preconcats the matrix with the specified matrix. M' = M * other

preRotate

boolean preRotate (float degrees)

Preconcats the matrix with the specified rotation. M' = M * R(degrees)

preRotate

boolean preRotate (float degrees, 
                float px, 
                float py)

Preconcats the matrix with the specified rotation. M' = M * R(degrees, px, py)

preScale

boolean preScale (float sx, 
                float sy)

Preconcats the matrix with the specified scale. M' = M * S(sx, sy)

preScale

boolean preScale (float sx, 
                float sy, 
                float px, 
                float py)

Preconcats the matrix with the specified scale. M' = M * S(sx, sy, px, py)

preSkew

boolean preSkew (float kx, 
                float ky)

Preconcats the matrix with the specified skew. M' = M * K(kx, ky)

preSkew

boolean preSkew (float kx, 
                float ky, 
                float px, 
                float py)

Preconcats the matrix with the specified skew. M' = M * K(kx, ky, px, py)

preTranslate

boolean preTranslate (float dx, 
                float dy)

Preconcats the matrix with the specified translation. M' = M * T(dx, dy)

rectStaysRect

boolean rectStaysRect ()

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.

reset

void reset ()

Set the matrix to identity

set

void set (Matrix src)

(deep) copy the src matrix into this matrix. If src is null, reset this matrix to the identity matrix.

setConcat

boolean setConcat (Matrix a, 
                Matrix b)

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.

setPolyToPoly

boolean setPolyToPoly (float[] src, 
                int srcIndex, 
                float[] dst, 
                int dstIndex, 
                int pointCount)

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.

setRectToRect

boolean setRectToRect (RectF src, 
                RectF dst, 
                Matrix.ScaleToFit stf)

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.

setRotate

void setRotate (float degrees, 
                float px, 
                float py)

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.

setRotate

void setRotate (float degrees)

Set the matrix to rotate about (0,0) by the specified number of degrees.

setScale

void setScale (float sx, 
                float sy)

Set the matrix to scale by sx and sy.

setScale

void setScale (float sx, 
                float sy, 
                float px, 
                float py)

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.

setSinCos

void setSinCos (float sinValue, 
                float cosValue, 
                float px, 
                float py)

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.

setSinCos

void setSinCos (float sinValue, 
                float cosValue)

Set the matrix to rotate by the specified sine and cosine values.

setSkew

void setSkew (float kx, 
                float ky)

Set the matrix to skew by sx and sy.

setSkew

void setSkew (float kx, 
                float ky, 
                float px, 
                float py)

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.

setTranslate

void setTranslate (float dx, 
                float dy)

Set the matrix to translate by (dx, dy).

setValues

void setValues (float[] values)

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.

toShortString

String toShortString ()

toString

String toString ()

Returns a string representation of the object. In general, the toString method returns a string that "textually represents" this object. The result should be a concise but informative representation that is easy for a person to read. It is recommended that all subclasses override this method.

The toString method for class Object returns a string consisting of the name of the class of which the object is an instance, the at-sign character `@', and the unsigned hexadecimal representation of the hash code of the object. In other words, this method returns a string equal to the value of:

 getClass().getName() + '@' + Integer.toHexString(hashCode())