DOMMatrix

DOMMatrix interface represents 4×4 matrices, suitable for 2D and 3D operations including rotation and translation. It is a mutable version of the DOMMatrixReadOnly 接口。

This interface should be available inside web workers , though some implementations don't allow it yet.

构造函数

DOMMatrix()
Creates and returns a new DOMMatrix 对象。

特性

This interface inherits properties from DOMMatrixReadOnly , though some of these properties are altered to be mutable.

is2D 只读
A Boolean flag whose value is true if the matrix was initialized as a 2D matrix. If false , the matrix is 3D.
isIdentity 只读
A Boolean whose value is true if the matrix is the identity matrix . The identity matrix is one in which every value is 0 except those on the main diagonal from top-left to bottom-right corner (in other words, where the offsets in each direction are equal).
m11 , m12 , m13 , m14 , m21 , m22 , m23 , m24 , m31 , m32 , m33 , m34 , m41 , m42 , m43 , m44
Double-precision floating-point values representing each component of a 4×4 matrix, where m11 through m14 are the first column, m21 through m24 are the second column, and so forth.
a , b , c , d , e , f

Double-precision floating-point values representing the components of a 4×4 matrix which are required in order to perform 2D rotations and translations. These are aliases for specific components of a 4×4 matrix, as shown below.

2D 3D equivalent
a m11
b m12
c m21
d m22
e m41
f m42

方法

This interface includes the following methods, as well as the methods it inherits from DOMMatrixReadOnly .

DOMMatrix.invertSelf()
Modifies the matrix by inverting it. If the matrix can't be inverted, its components are all set to NaN ,和 is2D 返回 false .
DOMMatrix.multiplySelf()
Modifies the matrix by post-multiplying it with the specified DOMMatrix . This is equivalent to the dot product A⋅B , where matrix A is the source matrix and B is the matrix given as an input to the method. Returns itself.
DOMMatrix.preMultiplySelf()
Modifies the matrix by pre-multiplying it with the specified DOMMatrix . This is equivalent to the dot product B⋅A , where matrix A is the source matrix and B is the matrix given as an input to the method. Returns itself.
DOMMatrix.translateSelf()
Modifies the matrix by applying the specified vector. The default vector is [0, 0, 0] . Returns itself.
DOMMatrix.scaleNonUniformSelf()
Modifies the matrix by applying the specified scaling on the X, Y, and Z axes, centered at the given origin. By default, the Y and Z axes' scaling factors are both 1 , but the scaling factor for X must be specified. The default origin is (0, 0, 0) . Returns itself.
DOMMatrix.scaleSelf()
Modifies the matrix by applying the specified scaling factors, with the center located at the specified origin. Also returns itself. By default, the scaling factor is 1 for all three axes, and the origin is (0, 0, 0) . Returns itself.
DOMMatrix.scale3dSelf()
Modifies the matrix by applying the specified scaling factor to all three axes, centered on the given origin. Returns itself.
DOMMatrix.rotateSelf()
Modifies the matrix by rotating itself around each axis by the specified number of degrees. Returns itself.
DOMMatrix.rotateAxisAngleSelf()
Modifies the matrix by rotating it by the specified angle around the given vector. Returns itself.
DOMMatrix.rotateFromVectorSelf()
Modifies the matrix by rotating it by the angle between the specified vector and (1, 0) . Returns itself.
DOMMatrix.setMatrixValue()
Replaces the contents of the matrix with the matrix described by the specified transform or transforms. Returns itself.
DOMMatrix.skewXSelf()
Modifies the matrix by applying the specified skew transformation along the X-axis. Returns itself.
DOMMatrix.skewYSelf()
Modifies the matrix by applying the specified skew transformation along the Y-axis. Returns itself.

静态方法

This interface inherits methods from DOMMatrixReadOnly .

fromFloat32Array()
Creates a new mutable DOMMatrix object given an array of single-precision (32-bit) floating-point values. If the array has six values, the result is a 2D matrix; if the array has 16 values, the result is a 3D matrix. Otherwise, a TypeError exception is thrown.
fromFloat64Array()
Creates a new mutable DOMMatrix object given an array of double-precision (64-bit) floating-point values. If the array has six values, the result is a 2D matrix; if the array has 16 values, the result is a 3D matrix. Otherwise, a TypeError exception is thrown.
fromMatrix()
Creates a new mutable DOMMatrix object given an existing matrix or a DOMMatrixInit dictionary which provides the values for its properties.

Usage notes

The matrix defined by the DOMMatrix interface is comprised of four rows of four columns each. While it's beyond the scope of this article to explain the mathematics involved, this 4×4 size is enough to describe any transformation you might apply to either 2D or 3D geometries.

[ m 11 m 21 m 31 m 41 m 12 m 22 m 32 m 42 m 13 m 23 m 33 m 43 m 14 m 24 m 34 m 44 ] \left [ \begin{matrix} m_{11} & m_{21} & m_{31} & m_{41} \\ m_{12} & m_{22} & m_{32} & m_{42} \\ m_{13} & m_{23} & m_{33} & m_{43} \\ m_{14} & m_{24} & m_{34} & m_{44} \end{matrix} \right ]
The positions of the 16 elements (m 11 through m 44 ) which comprise the 4×4 abstract matrix.

DOMMatrix interface is designed with the intent that it will be used for all matrices within markup, supplanting the SVGMatrix and CSSMatrix 接口。

规范

规范 状态 Comment
Geometry Interfaces Module Level 1
The definition of 'DOMMatrix' in that specification.
候选推荐 初始定义

浏览器兼容性

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DOMMatrix Chrome 61
61
45
Disabled
Disabled From version 45: this feature is behind the --enable-blink-features=GeometryInterfaces runtime flag.
Edge 79
79
79
Disabled
Disabled From version 79: this feature is behind the --enable-blink-features=GeometryInterfaces runtime flag.
Firefox 33 IE No Opera 48
48
32
Disabled
Disabled From version 32: this feature is behind the --enable-blink-features=GeometryInterfaces runtime flag.
Safari 11 WebView Android 61 Chrome Android 61
61
45
Disabled
Disabled From version 45: this feature is behind the --enable-blink-features=GeometryInterfaces runtime flag.
Firefox Android 33 Opera Android 48
48
32
Disabled
Disabled From version 32: this feature is behind the --enable-blink-features=GeometryInterfaces runtime flag.
Safari iOS 11 Samsung Internet Android 8.0
DOMMatrix() 构造函数 Chrome 45 Edge 79 Firefox 33 IE No Opera 32 Safari 11 WebView Android 61 Chrome Android 45 Firefox Android 33 Opera Android 32 Safari iOS 11 Samsung Internet Android 8.0
scale3dSelf() Chrome 45 Edge 79 Firefox 33
33
Starting in Firefox 69, the first parameter ( scale ) is now optional with a default value of 1, per the specification. Previously it was required.
IE No Opera 32 Safari 11 WebView Android 61 Chrome Android 45 Firefox Android 33
33
Firefox for Android requires the first parameter ( scale ).
Opera Android 32 Safari iOS 11 Samsung Internet Android 8.0
scaleSelf() Chrome 45 Edge 79 Firefox 33
33
Firefox 69 introduced support for the modern six-parameter syntax for scaleSelf() . Previously, it only supported the older three-parameter syntax: scale( scaleX [, originX ][, originY ]]]) .
IE No Opera 32 Safari 11 WebView Android 61 Chrome Android 45 Firefox Android 部分支持 33
部分支持 33
Firefox for Android only supports the older three-parameter syntax for scaleSelf() : scale( scaleX [, originX ][, originY ]]]) , and not the six-parameter syntax.
Opera Android 32 Safari iOS 11 Samsung Internet Android 8.0
Available in workers Chrome 57 Edge 79 Firefox 69 IE No Opera 44 Safari 11 WebView Android 61 Chrome Android 57 Firefox Android No Opera Android 43 Safari iOS 11 Samsung Internet Android 8.0

图例

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见实现注意事项。
用户必须明确启用此特征。
用户必须明确启用此特征。

另请参阅

  1. DOMMatrix
  2. 构造函数
    1. DOMMatrix()
  3. 继承:
    1. DOMMatrixReadOnly
  4. Related pages for Geometry Interfaces
    1. CSSMatrix
    2. DOMMatrixReadOnly
    3. Point