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
FloatPointer	mat()
float	mat(int i)
sk_matrix_t	mat(int i, float setter)
sk_matrix_t	position(long position)

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, 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

mat

public float mat(int i)

mat

public sk_matrix_t mat(int i,
                       float setter)

mat

@MemberGetter
public FloatPointer mat()