Matrix

Matrix

Class representing an affine transformation 3x3 matrix: 
     [ a  c  tx
A =    b  d  ty
       0  0  1  ]

Constructor

new Matrix(a, b, c, d, tx, ty)

Construct new instance of affine transformation matrix
If parameters omitted, construct identity matrix a = 1, d = 1
Source:
Parameters:
Name Type Default Description
a number 1 position(0,0) sx*cos(alpha)
b number 0 position (0,1) sx*sin(alpha)
c number 0 position (1,0) -sy*sin(alpha)
d number 1 position (1,1) sy*cos(alpha)
tx number 0 position (2,0) translation by x
ty number 0 position (2,1) translation by y

Classes

Matrix

Methods

clone() → {Matrix}

Return new cloned instance of matrix
Source:
Returns:
Type:
Matrix

equalTo(matrix) → {boolean}

Returns true if two matrix are equal parameter by parameter
Source:
Parameters:
Name Type Description
matrix Matrix other matrix
Returns:
Type:
boolean
true if equal, false otherwise

multiply(other_matrix) → {Matrix}

Returns result of multiplication of this matrix by other matrix
Source:
Parameters:
Name Type Description
other_matrix Matrix matrix to multiply by
Returns:
Type:
Matrix

rotate(angle, centerX, centerY) → {Matrix}

Return new matrix as a result of multiplication of the current matrix by the matrix that defines rotation by given angle (in radians) around center of rotation (centerX,centerY) in counterclockwise direction
Source:
Parameters:
Name Type Default Description
angle number angle in radians
centerX number 0 center of rotation
centerY number 0 center of rotation
Returns:
Type:
Matrix

scale(sx, sy) → {Matrix}

Return new matrix as a result of multiplication of the current matrix by the matrix (sx,0,0,sy,0,0) that defines scaling
Source:
Parameters:
Name Type Description
sx number
sy number
Returns:
Type:
Matrix

transform(vector) → {Array.<number>}

Transform vector [x,y] using transformation matrix.
Vector [x,y] is an abstract array[2] of numbers and not a FlattenJS object
The result is also an abstract vector [x',y'] = A * [x,y]: [x' [ ax + by + tx y' = cx + dy + ty 1] 1 ]
Source:
Parameters:
Name Type Description
vector Array.<number> array[2] of numbers
Returns:
Type:
Array.<number>
transformation result - array[2] of numbers

translate(vector, tx, ty) → {Matrix}

Return new matrix as a result of multiplication of the current matrix by the matrix(1,0,0,1,tx,ty)
Source:
Parameters:
Name Type Description
vector Vector Translation by vector or
tx number translation by x-axis
ty number translation by y-axis
Returns:
Type:
Matrix