DOMPointReadOnly - Web APIs 编辑

The DOMPointReadOnly interface specifies the coordinate and perspective fields used by DOMPoint to define a 2D or 3D point in a coordinate system.

Note:

There are two ways to create a new DOMPointReadOnly instance. First, you can use its constructor, passing in the values of the parameters for each dimension and, optionally, the perspective:

/* 2D */
const point = new DOMPointReadOnly(50, 50);

/* 3D */
const point = new DOMPointReadOnly(50, 50, 25);

/* 3D with perspective */
const point = new DOMPointReadOnly(100, 100, 100, 1.0);

The other option is to use the static DOMPointReadOnly.fromPoint() method:

const point = DOMPointReadOnly.fromPoint({x: 100, y: 100, z: 50; w: 1.0});

Constructor

DOMPointReadOnly()

Creates a new DOMPointReadOnly object given the values of its coordinates and perspective. To create a point using aDOMPointInit object, you can instead use DOMPointReadOnly.fromPoint().

Properties

DOMPointReadOnly.x Read only

The point's horizontal coordinate, x.

DOMPointReadOnly.y Read only

The point's vertical coordinate, y.

DOMPointReadOnly.z Read only

The point's depth coordinate, z.

DOMPointReadOnly.w Read only

The point's perspective value, w.

Static methods

DOMPointReadOnly.fromPoint()

A static method that creates a new DOMPointReadOnly object given the coordinates provided in the specified DOMPointInit object.

Methods

matrixTransform()

Applies a matrix transform specified as a DOMMatrixInit object to the DOMPointReadOnly object.

toJSON()

Returns a JSON representation of the DOMPointReadOnly object.

Specifications

Browser compatibility

BCD tables only load in the browser

See also

• DOMPoint
• DOMRect
• DOMMatrix