cesium
Version:
Cesium is a JavaScript library for creating 3D globes and 2D maps in a web browser without a plugin.
328 lines (288 loc) • 11.9 kB
JavaScript
/*global define*/
define([
'./Cartesian2',
'./Cartographic',
'./defaultValue',
'./defined',
'./DeveloperError',
'./GeographicProjection',
'./Intersect',
'./Rectangle'
], function(
Cartesian2,
Cartographic,
defaultValue,
defined,
DeveloperError,
GeographicProjection,
Intersect,
Rectangle) {
'use strict';
/**
* A bounding rectangle given by a corner, width and height.
* @alias BoundingRectangle
* @constructor
*
* @param {Number} [x=0.0] The x coordinate of the rectangle.
* @param {Number} [y=0.0] The y coordinate of the rectangle.
* @param {Number} [width=0.0] The width of the rectangle.
* @param {Number} [height=0.0] The height of the rectangle.
*
* @see BoundingSphere
*/
function BoundingRectangle(x, y, width, height) {
/**
* The x coordinate of the rectangle.
* @type {Number}
* @default 0.0
*/
this.x = defaultValue(x, 0.0);
/**
* The y coordinate of the rectangle.
* @type {Number}
* @default 0.0
*/
this.y = defaultValue(y, 0.0);
/**
* The width of the rectangle.
* @type {Number}
* @default 0.0
*/
this.width = defaultValue(width, 0.0);
/**
* The height of the rectangle.
* @type {Number}
* @default 0.0
*/
this.height = defaultValue(height, 0.0);
}
/**
* Computes a bounding rectangle enclosing the list of 2D points.
* The rectangle is oriented with the corner at the bottom left.
*
* @param {Cartesian2[]} positions List of points that the bounding rectangle will enclose. Each point must have <code>x</code> and <code>y</code> properties.
* @param {BoundingRectangle} [result] The object onto which to store the result.
* @returns {BoundingRectangle} The modified result parameter or a new BoundingRectangle instance if one was not provided.
*/
BoundingRectangle.fromPoints = function(positions, result) {
if (!defined(result)) {
result = new BoundingRectangle();
}
if (!defined(positions) || positions.length === 0) {
result.x = 0;
result.y = 0;
result.width = 0;
result.height = 0;
return result;
}
var length = positions.length;
var minimumX = positions[0].x;
var minimumY = positions[0].y;
var maximumX = positions[0].x;
var maximumY = positions[0].y;
for ( var i = 1; i < length; i++) {
var p = positions[i];
var x = p.x;
var y = p.y;
minimumX = Math.min(x, minimumX);
maximumX = Math.max(x, maximumX);
minimumY = Math.min(y, minimumY);
maximumY = Math.max(y, maximumY);
}
result.x = minimumX;
result.y = minimumY;
result.width = maximumX - minimumX;
result.height = maximumY - minimumY;
return result;
};
var defaultProjection = new GeographicProjection();
var fromRectangleLowerLeft = new Cartographic();
var fromRectangleUpperRight = new Cartographic();
/**
* Computes a bounding rectangle from an rectangle.
*
* @param {Rectangle} rectangle The valid rectangle used to create a bounding rectangle.
* @param {Object} [projection=GeographicProjection] The projection used to project the rectangle into 2D.
* @param {BoundingRectangle} [result] The object onto which to store the result.
* @returns {BoundingRectangle} The modified result parameter or a new BoundingRectangle instance if one was not provided.
*/
BoundingRectangle.fromRectangle = function(rectangle, projection, result) {
if (!defined(result)) {
result = new BoundingRectangle();
}
if (!defined(rectangle)) {
result.x = 0;
result.y = 0;
result.width = 0;
result.height = 0;
return result;
}
projection = defaultValue(projection, defaultProjection);
var lowerLeft = projection.project(Rectangle.southwest(rectangle, fromRectangleLowerLeft));
var upperRight = projection.project(Rectangle.northeast(rectangle, fromRectangleUpperRight));
Cartesian2.subtract(upperRight, lowerLeft, upperRight);
result.x = lowerLeft.x;
result.y = lowerLeft.y;
result.width = upperRight.x;
result.height = upperRight.y;
return result;
};
/**
* Duplicates a BoundingRectangle instance.
*
* @param {BoundingRectangle} rectangle The bounding rectangle to duplicate.
* @param {BoundingRectangle} [result] The object onto which to store the result.
* @returns {BoundingRectangle} The modified result parameter or a new BoundingRectangle instance if one was not provided. (Returns undefined if rectangle is undefined)
*/
BoundingRectangle.clone = function(rectangle, result) {
if (!defined(rectangle)) {
return undefined;
}
if (!defined(result)) {
return new BoundingRectangle(rectangle.x, rectangle.y, rectangle.width, rectangle.height);
}
result.x = rectangle.x;
result.y = rectangle.y;
result.width = rectangle.width;
result.height = rectangle.height;
return result;
};
/**
* Computes a bounding rectangle that is the union of the left and right bounding rectangles.
*
* @param {BoundingRectangle} left A rectangle to enclose in bounding rectangle.
* @param {BoundingRectangle} right A rectangle to enclose in a bounding rectangle.
* @param {BoundingRectangle} [result] The object onto which to store the result.
* @returns {BoundingRectangle} The modified result parameter or a new BoundingRectangle instance if one was not provided.
*/
BoundingRectangle.union = function(left, right, result) {
//>>includeStart('debug', pragmas.debug);
if (!defined(left)) {
throw new DeveloperError('left is required.');
}
if (!defined(right)) {
throw new DeveloperError('right is required.');
}
//>>includeEnd('debug');
if (!defined(result)) {
result = new BoundingRectangle();
}
var lowerLeftX = Math.min(left.x, right.x);
var lowerLeftY = Math.min(left.y, right.y);
var upperRightX = Math.max(left.x + left.width, right.x + right.width);
var upperRightY = Math.max(left.y + left.height, right.y + right.height);
result.x = lowerLeftX;
result.y = lowerLeftY;
result.width = upperRightX - lowerLeftX;
result.height = upperRightY - lowerLeftY;
return result;
};
/**
* Computes a bounding rectangle by enlarging the provided rectangle until it contains the provided point.
*
* @param {BoundingRectangle} rectangle A rectangle to expand.
* @param {Cartesian2} point A point to enclose in a bounding rectangle.
* @param {BoundingRectangle} [result] The object onto which to store the result.
* @returns {BoundingRectangle} The modified result parameter or a new BoundingRectangle instance if one was not provided.
*/
BoundingRectangle.expand = function(rectangle, point, result) {
//>>includeStart('debug', pragmas.debug);
if (!defined(rectangle)) {
throw new DeveloperError('rectangle is required.');
}
if (!defined(point)) {
throw new DeveloperError('point is required.');
}
//>>includeEnd('debug');
result = BoundingRectangle.clone(rectangle, result);
var width = point.x - result.x;
var height = point.y - result.y;
if (width > result.width) {
result.width = width;
} else if (width < 0) {
result.width -= width;
result.x = point.x;
}
if (height > result.height) {
result.height = height;
} else if (height < 0) {
result.height -= height;
result.y = point.y;
}
return result;
};
/**
* Determines if two rectangles intersect.
*
* @param {BoundingRectangle} left A rectangle to check for intersection.
* @param {BoundingRectangle} right The other rectangle to check for intersection.
* @returns {Intersect} <code>Intersect.INTESECTING</code> if the rectangles intersect, <code>Intersect.OUTSIDE</code> otherwise.
*/
BoundingRectangle.intersect = function(left, right) {
//>>includeStart('debug', pragmas.debug);
if (!defined(left)) {
throw new DeveloperError('left is required.');
}
if (!defined(right)) {
throw new DeveloperError('right is required.');
}
//>>includeEnd('debug');
var leftX = left.x;
var leftY = left.y;
var rightX = right.x;
var rightY = right.y;
if (!(leftX > rightX + right.width ||
leftX + left.width < rightX ||
leftY + left.height < rightY ||
leftY > rightY + right.height)) {
return Intersect.INTERSECTING;
}
return Intersect.OUTSIDE;
};
/**
* Compares the provided BoundingRectangles componentwise and returns
* <code>true</code> if they are equal, <code>false</code> otherwise.
*
* @param {BoundingRectangle} [left] The first BoundingRectangle.
* @param {BoundingRectangle} [right] The second BoundingRectangle.
* @returns {Boolean} <code>true</code> if left and right are equal, <code>false</code> otherwise.
*/
BoundingRectangle.equals = function(left, right) {
return (left === right) ||
((defined(left)) &&
(defined(right)) &&
(left.x === right.x) &&
(left.y === right.y) &&
(left.width === right.width) &&
(left.height === right.height));
};
/**
* Duplicates this BoundingRectangle instance.
*
* @param {BoundingRectangle} [result] The object onto which to store the result.
* @returns {BoundingRectangle} The modified result parameter or a new BoundingRectangle instance if one was not provided.
*/
BoundingRectangle.prototype.clone = function(result) {
return BoundingRectangle.clone(this, result);
};
/**
* Determines if this rectangle intersects with another.
*
* @param {BoundingRectangle} right A rectangle to check for intersection.
* @returns {Intersect} <code>Intersect.INTESECTING</code> if the rectangles intersect, <code>Intersect.OUTSIDE</code> otherwise.
*/
BoundingRectangle.prototype.intersect = function(right) {
return BoundingRectangle.intersect(this, right);
};
/**
* Compares this BoundingRectangle against the provided BoundingRectangle componentwise and returns
* <code>true</code> if they are equal, <code>false</code> otherwise.
*
* @param {BoundingRectangle} [right] The right hand side BoundingRectangle.
* @returns {Boolean} <code>true</code> if they are equal, <code>false</code> otherwise.
*/
BoundingRectangle.prototype.equals = function(right) {
return BoundingRectangle.equals(this, right);
};
return BoundingRectangle;
});