DOMPointInit.w
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 withDOMPointInit
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 asDOMPoint.fromPoint()
. - The
DOMPointReadOnly.toJSON()
method returns aDOMPointInit
object that describes the same point as the original point. By inheritance, this method is also available asDOMPoint.toJSON()
.
This value is assumed to be 1 by default if not included in the
DOMPointInit
object passed into fromPoint()
.
Specifications
Specification | Status | Comment |
---|---|---|
Geometry Interfaces Module Level 1 The definition of 'w' in that specification. |
Candidate Recommendation | Initial definition |
Browser compatibility
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