OrientationSensor
The OrientationSensor
interface of the Sensor APIs is the base class for orientation sensors. This interface cannot be used directly. Instead it provides properties and methods accessed by interfaces that inherit from it.
This feature may be blocked by a Permissions Policy set on your server.
Interfaces based on OrientationSensor
Below is a list of interfaces based on the OrientationSensor interface.
Instance properties
OrientationSensor.quaternion
-
Returns a four element
Array
whose elements contain the components of the unit quaternion representing the device's orientation.
Instance methods
OrientationSensor.populateMatrix()
-
Populates the given object with the rotation matrix based on the latest sensor reading. The rotation matrix is shown below.
Examples
Basic Example
The following example, which is loosely based on Intel's Orientation Phone demo, instantiates an AbsoluteOrientationSensor
with a frequency of 60 times a second. On each reading it uses OrientationSensor.quaternion
to rotate a visual model of a phone.
js
const options = { frequency: 60, referenceFrame: "device" };
const sensor = new AbsoluteOrientationSensor(options);
sensor.addEventListener("reading", () => {
// model is a Three.js object instantiated elsewhere.
model.quaternion.fromArray(sensor.quaternion).inverse();
});
sensor.addEventListener("error", (error) => {
if (event.error.name === "NotReadableError") {
console.log("Sensor is not available.");
}
});
sensor.start();
Permissions Example
Using orientation sensors requires requesting permissions for multiple device sensors. Because the Permissions
interface uses promises, a good way to request permissions is to use Promise.all
.
js
const sensor = new AbsoluteOrientationSensor();
Promise.all([
navigator.permissions.query({ name: "accelerometer" }),
navigator.permissions.query({ name: "magnetometer" }),
navigator.permissions.query({ name: "gyroscope" }),
]).then((results) => {
if (results.every((result) => result.state === "granted")) {
sensor.start();
// …
} else {
console.log("No permissions to use AbsoluteOrientationSensor.");
}
});
Specifications
Specification |
---|
Orientation Sensor # orientationsensor-interface |
Browser compatibility
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