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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 | 16x 16x 16x 16x 16x 16x 16x 6x 1x 2x 9x 2x 5x 2x 20x 20x 19x 19x 1x 1x 1x 1x 1x 11x 1x 11x 11x 6x 5x 5x 1x 8x | import Cartesian3 from "../Core/Cartesian3.js";
import defined from "../Core/defined.js";
import Ellipsoid from "../Core/Ellipsoid.js";
import Event from "../Core/Event.js";
import JulianDate from "../Core/JulianDate.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.default] The ellipsoid used to determine which way is up.
*
* @example
* //Create an entity with position and orientation.
* const position = new Cesium.SampledProperty();
* position.addSamples(...);
* const 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 = ellipsoid ?? Ellipsoid.default;
const 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) {
const oldValue = this._ellipsoid;
if (oldValue !== value) {
this._ellipsoid = value;
this._definitionChanged.raiseEvent(this);
}
},
},
});
const positionScratch = new Cartesian3();
const velocityScratch = new Cartesian3();
const rotationScratch = new Matrix3();
const timeScratch = new JulianDate();
/**
* Gets the value of the property at the provided time.
*
* @param {JulianDate} [time=JulianDate.now()] The time for which to retrieve the value. If omitted, the current system time is used.
* @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) {
if (!defined(time)) {
time = JulianDate.now(timeScratch);
}
const 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;
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