org.bytedeco.skia

Class sk_matrix_t

java.lang.Object

org.bytedeco.javacpp.Pointer

org.bytedeco.skia.sk_matrix_t

All Implemented Interfaces:

AutoCloseable

@Properties(inherit=Skia.class)
public class sk_matrix_t
extends Pointer

The sk_matrix_t struct holds a 3x3 perspective matrix for transforming coordinates:

(X,Y) = T[M]((x,y)) X = (M[0] * x + M[1] * y + M[2]) / (M[6] * x + M[7] * y + M[8]); Y = (M[3] * x + M[4] * y + M[5]) / (M[6] * x + M[7] * y + M[8]);

Therefore, the identity matrix is

sk_matrix_t identity = {{1, 0, 0, 0, 1, 0, 0, 0, 1}};

A matrix that scales by sx and sy is:

sk_matrix_t scale = {{sx, 0, 0, 0, sy, 0, 0, 0, 1}};

A matrix that translates by tx and ty is:

sk_matrix_t translate = {{1, 0, tx, 0, 1, ty, 0, 0, 1}};

A matrix that rotates around the origin by A radians:

sk_matrix_t rotate = {{cos(A), -sin(A), 0, sin(A), cos(A), 0, 0, 0, 1}};

Two matrixes can be concatinated by:

void concat_matrices(sk_matrix_t* dst, const sk_matrix_t* matrixU, const sk_matrix_t* matrixV) { const float* u = matrixU->mat; const float* v = matrixV->mat; sk_matrix_t result = {{ u[0] * v[0] + u[1] * v[3] + u[2] * v[6], u[0] * v[1] + u[1] * v[4] + u[2] * v[7], u[0] * v[2] + u[1] * v[5] + u[2] * v[8], u[3] * v[0] + u[4] * v[3] + u[5] * v[6], u[3] * v[1] + u[4] * v[4] + u[5] * v[7], u[3] * v[2] + u[4] * v[5] + u[5] * v[8], u[6] * v[0] + u[7] * v[3] + u[8] * v[6], u[6] * v[1] + u[7] * v[4] + u[8] * v[7], u[6] * v[2] + u[7] * v[5] + u[8] * v[8] }}; dst = result; }

Nested Class Summary

Nested classes/interfaces inherited from class org.bytedeco.javacpp.Pointer

Pointer.CustomDeallocator, Pointer.Deallocator, Pointer.NativeDeallocator, Pointer.ReferenceCounter

Field Summary

Fields inherited from class org.bytedeco.javacpp.Pointer

address, capacity, limit, position

Constructor Summary

Constructors

Constructor and Description
sk_matrix_t() Default native constructor.
sk_matrix_t(long size) Native array allocator.
sk_matrix_t(Pointer p) Pointer cast constructor.

Method Summary

Modifier and Type	Method and Description
float	persp0()
sk_matrix_t	persp0(float setter)
float	persp1()
sk_matrix_t	persp1(float setter)
float	persp2()
sk_matrix_t	persp2(float setter)
sk_matrix_t	position(long position)
float	scaleX()
sk_matrix_t	scaleX(float setter)
float	scaleY()
sk_matrix_t	scaleY(float setter)
float	skewX()
sk_matrix_t	skewX(float setter)
float	skewY()
sk_matrix_t	skewY(float setter)
float	transX()
sk_matrix_t	transX(float setter)
float	transY()
sk_matrix_t	transY(float setter)

Methods inherited from class org.bytedeco.javacpp.Pointer

address, asBuffer, asByteBuffer, availablePhysicalBytes, calloc, capacity, capacity, close, deallocate, deallocate, deallocateReferences, deallocator, deallocator, equals, fill, formatBytes, free, hashCode, isNull, isNull, limit, limit, malloc, maxBytes, maxPhysicalBytes, memchr, memcmp, memcpy, memmove, memset, offsetof, parseBytes, physicalBytes, position, put, realloc, referenceCount, releaseReference, retainReference, setNull, sizeof, toString, totalBytes, totalPhysicalBytes, withDeallocator, zero

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

sk_matrix_t

public sk_matrix_t()

Default native constructor.

sk_matrix_t

public sk_matrix_t(long size)

Native array allocator. Access with Pointer.position(long).

sk_matrix_t

public sk_matrix_t(Pointer p)

Pointer cast constructor. Invokes Pointer.Pointer(Pointer).

Method Detail

position

public sk_matrix_t position(long position)

Overrides:

position in class Pointer

scaleX

public float scaleX()

scaleX

public sk_matrix_t scaleX(float setter)

skewX

public float skewX()

skewX

public sk_matrix_t skewX(float setter)

transX

public float transX()

transX

public sk_matrix_t transX(float setter)

skewY

public float skewY()

skewY

public sk_matrix_t skewY(float setter)

scaleY

public float scaleY()

scaleY

public sk_matrix_t scaleY(float setter)

transY

public float transY()

transY

public sk_matrix_t transY(float setter)

persp0

public float persp0()

persp0

public sk_matrix_t persp0(float setter)

persp1

public float persp1()

persp1

public sk_matrix_t persp1(float setter)

persp2

public float persp2()

persp2

public sk_matrix_t persp2(float setter)