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VelocityOrientationProperty.js
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VelocityOrientationProperty.js
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import Cartesian3 from "../Core/Cartesian3.js";
import defaultValue from "../Core/defaultValue.js";
import defined from "../Core/defined.js";
import Ellipsoid from "../Core/Ellipsoid.js";
import Event from "../Core/Event.js";
import Matrix3 from "../Core/Matrix3.js";
import Quaternion from "../Core/Quaternion.js";
import Transforms from "../Core/Transforms.js";
import Property from "./Property.js";
import VelocityVectorProperty from "./VelocityVectorProperty.js";
/**
* A {@link Property} which evaluates to a {@link Quaternion} rotation
* based on the velocity of the provided {@link PositionProperty}.
*
* @alias VelocityOrientationProperty
* @constructor
*
* @param {PositionProperty} [position] The position property used to compute the orientation.
* @param {Ellipsoid} [ellipsoid=Ellipsoid.WGS84] The ellipsoid used to determine which way is up.
*
* @example
* //Create an entity with position and orientation.
* var position = new Cesium.SampledProperty();
* position.addSamples(...);
* var entity = viewer.entities.add({
* position : position,
* orientation : new Cesium.VelocityOrientationProperty(position)
* }));
*/
function VelocityOrientationProperty(position, ellipsoid) {
this._velocityVectorProperty = new VelocityVectorProperty(position, true);
this._subscription = undefined;
this._ellipsoid = undefined;
this._definitionChanged = new Event();
this.ellipsoid = defaultValue(ellipsoid, Ellipsoid.WGS84);
var that = this;
this._velocityVectorProperty.definitionChanged.addEventListener(function () {
that._definitionChanged.raiseEvent(that);
});
}
Object.defineProperties(VelocityOrientationProperty.prototype, {
/**
* Gets a value indicating if this property is constant.
* @memberof VelocityOrientationProperty.prototype
*
* @type {Boolean}
* @readonly
*/
isConstant: {
get: function () {
return Property.isConstant(this._velocityVectorProperty);
},
},
/**
* Gets the event that is raised whenever the definition of this property changes.
* @memberof VelocityOrientationProperty.prototype
*
* @type {Event}
* @readonly
*/
definitionChanged: {
get: function () {
return this._definitionChanged;
},
},
/**
* Gets or sets the position property used to compute orientation.
* @memberof VelocityOrientationProperty.prototype
*
* @type {Property|undefined}
*/
position: {
get: function () {
return this._velocityVectorProperty.position;
},
set: function (value) {
this._velocityVectorProperty.position = value;
},
},
/**
* Gets or sets the ellipsoid used to determine which way is up.
* @memberof VelocityOrientationProperty.prototype
*
* @type {Property|undefined}
*/
ellipsoid: {
get: function () {
return this._ellipsoid;
},
set: function (value) {
var oldValue = this._ellipsoid;
if (oldValue !== value) {
this._ellipsoid = value;
this._definitionChanged.raiseEvent(this);
}
},
},
});
var positionScratch = new Cartesian3();
var velocityScratch = new Cartesian3();
var rotationScratch = new Matrix3();
/**
* Gets the value of the property at the provided time.
*
* @param {JulianDate} [time] The time for which to retrieve the value.
* @param {Quaternion} [result] The object to store the value into, if omitted, a new instance is created and returned.
* @returns {Quaternion} The modified result parameter or a new instance if the result parameter was not supplied.
*/
VelocityOrientationProperty.prototype.getValue = function (time, result) {
var velocity = this._velocityVectorProperty._getValue(
time,
velocityScratch,
positionScratch
);
if (!defined(velocity)) {
return undefined;
}
Transforms.rotationMatrixFromPositionVelocity(
positionScratch,
velocity,
this._ellipsoid,
rotationScratch
);
return Quaternion.fromRotationMatrix(rotationScratch, result);
};
/**
* Compares this property to the provided property and returns
* <code>true</code> if they are equal, <code>false</code> otherwise.
*
* @param {Property} [other] The other property.
* @returns {Boolean} <code>true</code> if left and right are equal, <code>false</code> otherwise.
*/
VelocityOrientationProperty.prototype.equals = function (other) {
return (
this === other || //
(other instanceof VelocityOrientationProperty &&
Property.equals(
this._velocityVectorProperty,
other._velocityVectorProperty
) &&
(this._ellipsoid === other._ellipsoid ||
this._ellipsoid.equals(other._ellipsoid)))
);
};
export default VelocityOrientationProperty;