three.js/src/core/Rectangle.js

/**
 * @author mr.doob / http://mrdoob.com/
 */

THREE.Rectangle = function () {

	var _left, _top, _right, _bottom,
	_width, _height, _isEmpty = true;

	function resize() {

		_width = _right - _left;
		_height = _bottom - _top;

	}

	this.getX = function () {

		return _left;

	};

	this.getY = function () {

		return _top;

	};

	this.getWidth = function () {

		return _width;

	};

	this.getHeight = function () {

		return _height;

	};

	this.getLeft = function() {

		return _left;

	};

	this.getTop = function() {

		return _top;

	};

	this.getRight = function() {

		return _right;

	};

	this.getBottom = function() {

		return _bottom;

	};

	this.set = function ( left, top, right, bottom ) {

		_isEmpty = false;

		_left = left; _top = top;
		_right = right; _bottom = bottom;

		resize();

	};

	this.addPoint = function ( x, y ) {

		if ( _isEmpty ) {

			_isEmpty = false;
			_left = x; _top = y;
			_right = x; _bottom = y;

			resize();

		} else {

			_left = _left < x ? _left : x; // Math.min( _left, x );
			_top = _top < y ? _top : y; // Math.min( _top, y );
			_right = _right > x ? _right : x; // Math.max( _right, x );
			_bottom = _bottom > y ? _bottom : y; // Math.max( _bottom, y );

			resize();
		}

	};

	this.add3Points = function ( x1, y1, x2, y2, x3, y3 ) {

		if (_isEmpty) {

			_isEmpty = false;
			_left = x1 < x2 ? ( x1 < x3 ? x1 : x3 ) : ( x2 < x3 ? x2 : x3 );
			_top = y1 < y2 ? ( y1 < y3 ? y1 : y3 ) : ( y2 < y3 ? y2 : y3 );
			_right = x1 > x2 ? ( x1 > x3 ? x1 : x3 ) : ( x2 > x3 ? x2 : x3 );
			_bottom = y1 > y2 ? ( y1 > y3 ? y1 : y3 ) : ( y2 > y3 ? y2 : y3 );

			resize();

		} else {

			_left = x1 < x2 ? ( x1 < x3 ? ( x1 < _left ? x1 : _left ) : ( x3 < _left ? x3 : _left ) ) : ( x2 < x3 ? ( x2 < _left ? x2 : _left ) : ( x3 < _left ? x3 : _left ) );
			_top = y1 < y2 ? ( y1 < y3 ? ( y1 < _top ? y1 : _top ) : ( y3 < _top ? y3 : _top ) ) : ( y2 < y3 ? ( y2 < _top ? y2 : _top ) : ( y3 < _top ? y3 : _top ) );
			_right = x1 > x2 ? ( x1 > x3 ? ( x1 > _right ? x1 : _right ) : ( x3 > _right ? x3 : _right ) ) : ( x2 > x3 ? ( x2 > _right ? x2 : _right ) : ( x3 > _right ? x3 : _right ) );
			_bottom = y1 > y2 ? ( y1 > y3 ? ( y1 > _bottom ? y1 : _bottom ) : ( y3 > _bottom ? y3 : _bottom ) ) : ( y2 > y3 ? ( y2 > _bottom ? y2 : _bottom ) : ( y3 > _bottom ? y3 : _bottom ) );

			resize();

		};

	};

	this.addRectangle = function ( r ) {

		if ( _isEmpty ) {

			_isEmpty = false;
			_left = r.getLeft(); _top = r.getTop();
			_right = r.getRight(); _bottom = r.getBottom();

			resize();

		} else {

			_left = _left < r.getLeft() ? _left : r.getLeft(); // Math.min(_left, r.getLeft() );
			_top = _top < r.getTop() ? _top : r.getTop(); // Math.min(_top, r.getTop() );
			_right = _right > r.getRight() ? _right : r.getRight(); // Math.max(_right, r.getRight() );
			_bottom = _bottom > r.getBottom() ? _bottom : r.getBottom(); // Math.max(_bottom, r.getBottom() );

			resize();

		}

	};

	this.inflate = function ( v ) {

		_left -= v; _top -= v;
		_right += v; _bottom += v;

		resize();

	};

	this.minSelf = function ( r ) {

		_left = _left > r.getLeft() ? _left : r.getLeft(); // Math.max( _left, r.getLeft() );
		_top = _top > r.getTop() ? _top : r.getTop(); // Math.max( _top, r.getTop() );
		_right = _right < r.getRight() ? _right : r.getRight(); // Math.min( _right, r.getRight() );
		_bottom = _bottom < r.getBottom() ? _bottom : r.getBottom(); // Math.min( _bottom, r.getBottom() );

		resize();

	};

	this.intersects = function ( r ) {

		// http://gamemath.com/2011/09/detecting-whether-two-boxes-overlap/

		if ( _right < r.getLeft() ) return false;
		if ( _left > r.getRight() ) return false;
		if ( _bottom < r.getTop() ) return false;
		if ( _top > r.getBottom() ) return false;

		return true;

	};

	this.empty = function () {

		_isEmpty = true;

		_left = 0; _top = 0;
		_right = 0; _bottom = 0;

		resize();

	};

	this.isEmpty = function () {

		return _isEmpty;

	};

};