DOMPointInit.w - Web APIs 编辑

The DOMPointInit dictionary's w property is used to specify the w perspective value of a point in space when either creating or serializing to JSON a DOMPoint or DOMPointReadOnly object.

Syntax

var DOMPointInit = {
  w: wPerspective
};

DOMPointInit.w = wPerspective;

var wPerspective = DOMPointInit.w;

Value

A double-precision floating-point value indicating the point's w perspective value. This value is unrestricted, meaning that it is allowed to be infinite or invalid (that is, its value may be NaN or ±Infinity).

There are two methods which use DOMPointInit:

• The static function DOMPointReadOnly.fromPoint() takes an object that complies with DOMPointInit as its sole input parameter, to specify the coordinates and perspective value of the new point to be created. This method is, by inheritance, also available as DOMPoint.fromPoint().
• The DOMPointReadOnly.toJSON() method returns a DOMPointInit object that describes the same point as the original point. By inheritance, this method is also available as DOMPoint.toJSON().

This value is assumed to be 1 by default if not included in the DOMPointInit object passed into fromPoint().

Specifications

Browser compatibility

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