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PositionProperty.js
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PositionProperty.js
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define([
'../Core/Cartesian3',
'../Core/defined',
'../Core/defineProperties',
'../Core/DeveloperError',
'../Core/Matrix3',
'../Core/ReferenceFrame',
'../Core/Transforms'
], function(
Cartesian3,
defined,
defineProperties,
DeveloperError,
Matrix3,
ReferenceFrame,
Transforms) {
'use strict';
/**
* The interface for all {@link Property} objects that define a world
* location as a {@link Cartesian3} with an associated {@link ReferenceFrame}.
* This type defines an interface and cannot be instantiated directly.
*
* @alias PositionProperty
* @constructor
*
* @see CompositePositionProperty
* @see ConstantPositionProperty
* @see SampledPositionProperty
* @see TimeIntervalCollectionPositionProperty
*/
function PositionProperty() {
DeveloperError.throwInstantiationError();
}
defineProperties(PositionProperty.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 PositionProperty.prototype
*
* @type {Boolean}
* @readonly
*/
isConstant : {
get : DeveloperError.throwInstantiationError
},
/**
* 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 PositionProperty.prototype
*
* @type {Event}
* @readonly
*/
definitionChanged : {
get : DeveloperError.throwInstantiationError
},
/**
* Gets the reference frame that the position is defined in.
* @memberof PositionProperty.prototype
* @type {ReferenceFrame}
*/
referenceFrame : {
get : DeveloperError.throwInstantiationError
}
});
/**
* Gets the value of the property at the provided time in the fixed frame.
* @function
*
* @param {JulianDate} time The time for which to retrieve the value.
* @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.
*/
PositionProperty.prototype.getValue = DeveloperError.throwInstantiationError;
/**
* Gets the value of the property at the provided time and in the provided reference frame.
* @function
*
* @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.
*/
PositionProperty.prototype.getValueInReferenceFrame = DeveloperError.throwInstantiationError;
/**
* Compares this property to the provided property and returns
* <code>true</code> if they are equal, <code>false</code> otherwise.
* @function
*
* @param {Property} [other] The other property.
* @returns {Boolean} <code>true</code> if left and right are equal, <code>false</code> otherwise.
*/
PositionProperty.prototype.equals = DeveloperError.throwInstantiationError;
var scratchMatrix3 = new Matrix3();
/**
* @private
*/
PositionProperty.convertToReferenceFrame = function(time, value, inputFrame, outputFrame, result) {
if (!defined(value)) {
return value;
}
if (!defined(result)){
result = new Cartesian3();
}
if (inputFrame === outputFrame) {
return Cartesian3.clone(value, result);
}
var icrfToFixed = Transforms.computeIcrfToFixedMatrix(time, scratchMatrix3);
if (!defined(icrfToFixed)) {
icrfToFixed = Transforms.computeTemeToPseudoFixedMatrix(time, scratchMatrix3);
}
if (inputFrame === ReferenceFrame.INERTIAL) {
return Matrix3.multiplyByVector(icrfToFixed, value, result);
}
if (inputFrame === ReferenceFrame.FIXED) {
return Matrix3.multiplyByVector(Matrix3.transpose(icrfToFixed, scratchMatrix3), value, result);
}
};
return PositionProperty;
});