DOMPoint

A DOMPoint represents a 2D or 3D point in a coordinate system.

In general, a positive x component represents a position right of the origin, a positive y component upwards from the origin, and a positive z component outwards from the screen (in other words, opposite the direction that the user is facing).

It inherits from its parent, DOMPointReadOnly.

Constructor

DOMPoint()

Creates a new DOMPoint object.

Methods

DOMPoint inherits methods from its parent, DOMPointReadOnly.

DOMPointReadOnly.fromPoint

Translates the position/perspective of a DOMPoint to a new position (doesn't appear to be supported anywhere yet.)

Properties

DOMPoint inherits properties from its parent, DOMPointReadOnly.

DOMPointReadOnly.x Read only

The x coordinate of the DOMPoint.

DOMPointReadOnly.y Read only

The y coordinate of the DOMPoint.

DOMPointReadOnly.z Read only

The z coordinate of the DOMPoint.

DOMPointReadOnly.w Read only

The perspective value of the DOMPoint.

Examples

In the WebVR API, DOMPoint values are used to represent points in the coordinate space that the user's head mounted display exists in. In the following snippet, the position of the VR HMD can be retrieved by first grabbing a reference to the position sensor's current state using PositionSensorVRDevice.getState, then accessing the resulting VRPositionState's position property, which returns a DOMPoint. Note below the usage of position.x, position.y, and position.z.

function setView() {
      var posState = gPositionSensor.getState();
      if(posState.hasPosition) {
        posPara.textContent = 'Position: x' + roundToTwo(posState.position.x) + " y"
                                    + roundToTwo(posState.position.y) + " z"
                                    + roundToTwo(posState.position.z);
        xPos = -posState.position.x * WIDTH * 2;
        yPos = posState.position.y * HEIGHT * 2;
        if(-posState.position.z > 0.01) {
          zPos = -posState.position.z;
        } else {
          zPos = 0.01;
        }
      }

  ...

}

Specifications

Specification	Status	Comment
Geometry Interfaces Module Level 1 The definition of 'DOMPoint' in that specification.	Candidate Recommendation	Latest spec version is an ED.

Browser compatibility

See also

• DOMRect