/*
* 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 SurfaceRectangle
*/
define([
'../geom/Angle',
'../error/ArgumentError',
'../geom/Location',
'../util/Logger',
'../shapes/ShapeAttributes',
'../shapes/SurfaceShape',
'../util/WWMath'
],
function (Angle,
ArgumentError,
Location,
Logger,
ShapeAttributes,
SurfaceShape,
WWMath) {
"use strict";
/**
* Constructs a surface rectangle with a specified center and size and an optional attributes bundle.
* @alias SurfaceRectangle
* @constructor
* @augments SurfaceShape
* @classdesc Represents a rectangle draped over the terrain surface.
* <p>
* SurfaceRectangle uses the following attributes from its associated shape attributes bundle:
* <ul>
* <li>Draw interior</li>
* <li>Draw outline</li>
* <li>Interior color</li>
* <li>Outline color</li>
* <li>Outline width</li>
* <li>Outline stipple factor</li>
* <li>Outline stipple pattern</li>
* </ul>
* @param {Location} center The rectangle's center location.
* @param {Number} width The rectangle's width in meters.
* @param {Number} height The rectangle's height in meters.
* @param {Number} heading The rectangle's heading.
* @param {ShapeAttributes} attributes The attributes to apply to this shape. May be null, in which case
* attributes must be set directly before the shape is drawn.
* @throws {ArgumentError} If the specified center location is null or undefined or if either specified width
* or height is negative.
*/
var SurfaceRectangle = function (center, width, height, heading, attributes) {
if (!center) {
throw new ArgumentError(
Logger.logMessage(Logger.LEVEL_SEVERE, "SurfaceRectangle", "constructor", "missingLocation"));
}
if (width < 0 || height < 0) {
throw new ArgumentError(
Logger.logMessage(Logger.LEVEL_SEVERE, "SurfaceRectangle", "constructor", "Size is negative."));
}
SurfaceShape.call(this, attributes);
// All these are documented with their property accessors below.
this._center = center;
this._width = width;
this._height = height;
this._heading = heading;
};
SurfaceRectangle.prototype = Object.create(SurfaceShape.prototype);
Object.defineProperties(SurfaceRectangle.prototype, {
/**
* This shape's center location.
* @memberof SurfaceRectangle.prototype
* @type {Location}
*/
center: {
get: function() {
return this._center;
},
set: function(value) {
this.stateKeyInvalid = true;
this.resetBoundaries();
this._center = value;
}
},
/**
* This shape's width, in meters.
* @memberof SurfaceRectangle.prototype
* @type {Number}
*/
width: {
get: function() {
return this._width;
},
set: function(value) {
this.stateKeyInvalid = true;
this.resetBoundaries();
this._width = value;
}
},
/**
* This shape's height in meters.
* @memberof SurfaceRectangle.prototype
* @type {Number}
*/
height: {
get: function() {
return this._height;
},
set: function(value) {
this.stateKeyInvalid = true;
this.resetBoundaries();
this._height = value;
}
},
/**
* The shape's heading, specified as degrees clockwise from North. This shape's height and width are
* relative to its heading.
* @memberof SurfaceRectangle.prototype
* @type {number}
* @default 0
*/
heading: {
get: function() {
return this._heading;
},
set: function(value) {
this.stateKeyInvalid = true;
this.resetBoundaries();
this._heading = value;
}
}
});
// Internal use only. Intentionally not documented.
SurfaceRectangle.staticStateKey = function(shape) {
var shapeStateKey = SurfaceShape.staticStateKey(shape);
return shapeStateKey +
" ce " + shape.center.toString() +
" wi " + shape.width.toString() +
" he " + shape.height.toString() +
" hd " + shape.heading.toString();
};
// Internal use only. Intentionally not documented.
SurfaceRectangle.prototype.computeStateKey = function() {
return SurfaceRectangle.staticStateKey(this);
};
// Internal. Intentionally not documented.
SurfaceRectangle.prototype.computeBoundaries = function(dc) {
var halfWidth = 0.5 * this.width,
halfHeight = 0.5 * this.height,
globeRadius = dc.globe.radiusAt(this.center.latitude, this.center.longitude);
this._boundaries = new Array(4);
this.addLocation(0, -halfWidth, -halfHeight, globeRadius);
this.addLocation(1, halfWidth, -halfHeight, globeRadius);
this.addLocation(2, halfWidth, halfHeight, globeRadius);
this.addLocation(3, -halfWidth, halfHeight, globeRadius);
};
SurfaceRectangle.prototype.addLocation = function(idx, xLength, yLength, globeRadius) {
var distance = Math.sqrt(xLength * xLength + yLength * yLength);
// azimuth runs positive clockwise from north and through 360 degrees.
var azimuth = (Math.PI / 2.0) - (Math.acos(xLength / distance) * WWMath.signum(yLength) - this.heading * Angle.DEGREES_TO_RADIANS);
this._boundaries[idx] = Location.greatCircleLocation(this.center, azimuth * Angle.RADIANS_TO_DEGREES,
distance / globeRadius, new Location(0, 0));
};
return SurfaceRectangle;
});