netDxf/BoundingRectangle.cs

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#region netDxf, Copyright(C) 2014 Daniel Carvajal, Licensed under LGPL.

//                        netDxf library
// Copyright (C) 2014 Daniel Carvajal (haplokuon@gmail.com)
// 
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
// 
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
// FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
// IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 

#endregion

using System;
using System.Collections.Generic;

namespace netDxf
{
    /// <summary>
    /// Represents an axis aligned bounding rectangle.
    /// </summary>
    public class BoundingRectangle
    {

        #region private fields

        protected Vector2 min;
        protected Vector2 max;

        #endregion

        #region constructors

        /// <summary>
        /// Initializes a new axis aligned bounding rectangle from a rotated ellipse.
        /// </summary>
        /// <param name="center">Center of the ellipse.</param>
        /// <param name="majorAxis">Major axis of the ellipse.</param>
        /// <param name="minorAxis">Minor axis of the ellipse.</param>
        /// <param name="rotation">Rotation in degrees of the ellipse.</param>
        public BoundingRectangle(Vector2 center, double majorAxis, double minorAxis, double rotation)
        {
            double rot = rotation*MathHelper.DegToRad;
            double a = majorAxis * 0.5 * Math.Cos(rot);
            double b = minorAxis * 0.5 * Math.Sin(rot);
            double c = majorAxis * 0.5 * Math.Sin(rot);
            double d = minorAxis * 0.5 * Math.Cos(rot);

            double width = Math.Sqrt(a * a + b * b) * 2;
            double height = Math.Sqrt(c * c + d * d) * 2;
            this.min = new Vector2(center.X - width * 0.5, center.Y - height * 0.5);