The DOMPoint static method fromPoint() creates and returns a new mutable DOMPoint object given a source point.

You can also create a new DOMPoint object using the new DOMPoint() constructor.

Although this interface is based on DOMPointReadOnly, it is not read-only; the properties within may be changed at will.

sourcePoint

A DOMPoint or DOMPointReadOnly instance, or an object containing the following properties, from which to take the values of the new point's properties:

x

An unrestricted floating-point value indicating the x-coordinate of the point in space. This is generally the horizontal coordinate, with positive values being to the right and negative values to the left. The default value is 0.

y

An unrestricted floating-point number providing the point's y-coordinate. This is the vertical coordinate, and barring any transforms applied to the coordinate system, positive values are downward and negative values upward toward the top of the screen. The default is 0.

z

An unrestricted floating-point value which gives the point's z-coordinate, which is (assuming no transformations that alter the situation) the depth coordinate; positive values are closer to the user and negative values retreat back into the screen. The default value is 0.

w

The point's w perspective value, given as an unrestricted floating-point number. The default is 1.

A new DOMPoint object whose coordinate and perspective values are identical to those in the source point. The point's properties are mutable and may be changed at any time.

If you have a DOMPointReadOnly object, you can easily create a mutable copy of that point:

const mutablePoint = DOMPoint.fromPoint(readOnlyPoint);

This sample creates a 2D point, specifying an inline object that includes the values to use for x and y. The z and w properties are allowed to keep their default values (0 and 1 respectively).

const center = DOMPoint.fromPoint({ x: 75, y: -50, z: -55, w: 0.25 });