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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 | 493x 493x 493x 1x 352x 938x 9x 1x 1x 1220x 1x 1220x 1x 6x 6x 4x 4x 6x 1x 1x 6x 5x 1x 1296x 1296x 1x 1295x 1x 15x | import Cartesian3 from "../Core/Cartesian3.js";
import defined from "../Core/defined.js";
import DeveloperError from "../Core/DeveloperError.js";
import Event from "../Core/Event.js";
import JulianDate from "../Core/JulianDate.js";
import ReferenceFrame from "../Core/ReferenceFrame.js";
import PositionProperty from "./PositionProperty.js";
/**
* A {@link PositionProperty} whose value does not change in respect to the
* {@link ReferenceFrame} in which is it defined.
*
* @alias ConstantPositionProperty
* @constructor
*
* @param {Cartesian3} [value] The property value.
* @param {ReferenceFrame} [referenceFrame=ReferenceFrame.FIXED] The reference frame in which the position is defined.
*/
function ConstantPositionProperty(value, referenceFrame) {
this._definitionChanged = new Event();
this._value = Cartesian3.clone(value);
this._referenceFrame = referenceFrame ?? ReferenceFrame.FIXED;
}
Object.defineProperties(ConstantPositionProperty.prototype, {
/**
* Gets a value indicating if this property is constant. A property is considered
* constant if getValue always returns the same result for the current definition.
* @memberof ConstantPositionProperty.prototype
*
* @type {boolean}
* @readonly
*/
isConstant: {
get: function () {
return (
!defined(this._value) || this._referenceFrame === ReferenceFrame.FIXED
);
},
},
/**
* Gets the event that is raised whenever the definition of this property changes.
* The definition is considered to have changed if a call to getValue would return
* a different result for the same time.
* @memberof ConstantPositionProperty.prototype
*
* @type {Event}
* @readonly
*/
definitionChanged: {
get: function () {
return this._definitionChanged;
},
},
/**
* Gets the reference frame in which the position is defined.
* @memberof ConstantPositionProperty.prototype
* @type {ReferenceFrame}
* @default ReferenceFrame.FIXED;
*/
referenceFrame: {
get: function () {
return this._referenceFrame;
},
},
});
const timeScratch = new JulianDate();
/**
* Gets the value of the property at the provided time in the fixed frame.
*
* @param {JulianDate} [time=JulianDate.now()] The time for which to retrieve the value. If omitted, the current system time is used.
* @param {object} [result] The object to store the value into, if omitted, a new instance is created and returned.
* @returns {object} The modified result parameter or a new instance if the result parameter was not supplied.
*/
ConstantPositionProperty.prototype.getValue = function (time, result) {
if (!defined(time)) {
time = JulianDate.now(timeScratch);
}
return this.getValueInReferenceFrame(time, ReferenceFrame.FIXED, result);
};
/**
* Sets the value of the property.
*
* @param {Cartesian3} value The property value.
* @param {ReferenceFrame} [referenceFrame=this.referenceFrame] The reference frame in which the position is defined.
*/
ConstantPositionProperty.prototype.setValue = function (value, referenceFrame) {
let definitionChanged = false;
if (!Cartesian3.equals(this._value, value)) {
definitionChanged = true;
this._value = Cartesian3.clone(value);
}
if (defined(referenceFrame) && this._referenceFrame !== referenceFrame) {
definitionChanged = true;
this._referenceFrame = referenceFrame;
}
if (definitionChanged) {
this._definitionChanged.raiseEvent(this);
}
};
/**
* Gets the value of the property at the provided time and in the provided reference frame.
*
* @param {JulianDate} time The time for which to retrieve the value.
* @param {ReferenceFrame} referenceFrame The desired referenceFrame of the result.
* @param {Cartesian3} [result] The object to store the value into, if omitted, a new instance is created and returned.
* @returns {Cartesian3} The modified result parameter or a new instance if the result parameter was not supplied.
*/
ConstantPositionProperty.prototype.getValueInReferenceFrame = function (
time,
referenceFrame,
result,
) {
//>>includeStart('debug', pragmas.debug);
Iif (!defined(time)) {
throw new DeveloperError("time is required.");
}
if (!defined(referenceFrame)) {
throw new DeveloperError("referenceFrame is required.");
}
//>>includeEnd('debug');
return PositionProperty.convertToReferenceFrame(
time,
this._value,
this._referenceFrame,
referenceFrame,
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.
*/
ConstantPositionProperty.prototype.equals = function (other) {
return (
this === other ||
(other instanceof ConstantPositionProperty &&
Cartesian3.equals(this._value, other._value) &&
this._referenceFrame === other._referenceFrame)
);
};
export default ConstantPositionProperty;
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