/*
* Copyright 2015-2017 WorldWind Contributors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* @exports Touch
*/
define([],
function () {
"use strict";
/**
* Constructs a touch point.
* @alias Touch
* @constructor
* @classdesc Represents a touch point.
* @param {Color} identifier A number uniquely identifying the touch point
* @param {Number} clientX The X coordinate of the touch point's location.
* @param {Number} clientY The Y coordinate of the touch point's location.
*/
var Touch = function (identifier, clientX, clientY) {
/**
* A number uniquely identifying this touch point.
* @type {Number}
* @readonly
*/
this.identifier = identifier;
// Intentionally not documented.
this._clientX = clientX;
// Intentionally not documented.
this._clientY = clientY;
// Intentionally not documented.
this._clientStartX = clientX;
// Intentionally not documented.
this._clientStartY = clientY;
};
Object.defineProperties(Touch.prototype, {
/**
* Indicates the X coordinate of this touch point's location.
* @type {Number}
* @memberof Touch.prototype
*/
clientX: {
get: function () {
return this._clientX;
},
set: function (value) {
this._clientX = value;
}
},
/**
* Indicates the Y coordinate of this touch point's location.
* @type {Number}
* @memberof Touch.prototype
*/
clientY: {
get: function () {
return this._clientY;
},
set: function (value) {
this._clientY = value;
}
},
/**
* Indicates this touch point's translation along the X axis since the touch started.
* @type {Number}
* @memberof Touch.prototype
*/
translationX: {
get: function () {
return this._clientX - this._clientStartX;
},
set: function (value) {
this._clientStartX = this._clientX - value;
}
},
/**
* Indicates this touch point's translation along the Y axis since the touch started.
* @type {Number}
* @memberof Touch.prototype
*/
translationY: {
get: function () {
return this._clientY - this._clientStartY;
},
set: function (value) {
this._clientStartY = this._clientY - value;
}
}
});
return Touch;
});