SharpVectors - SVG# Reloaded: An Introduction

// <developer>niklas@protocol7.com</developer>
// <developer>kevin@kevlindev.com</developer>
// <completed>100</completed>

using System;
using System.Globalization;
using System.Text.RegularExpressions;

namespace SharpVectors.Dom.Svg
{
	/// <summary>
	/// Rectangles are defined as consisting of a (x,y) coordinate pair 
	/// identifying a minimum X value, a minimum Y value, and a width 
	/// and height, which are usually constrained to be non-negative. 
	/// </summary>
    public sealed class SvgRect : ISvgRect
	{
        #region Static Fields

        public static readonly SvgRect Empty = new SvgRect(0,0,0,0);
        
        #endregion

        #region Private Fields

        private double x;
        private double y;
        private double width;
        private double height;
		
        #endregion

		#region Constructors

        public SvgRect(double x, double y, double width, double height)
        {
            this.x      = x;
            this.y      = y;
            this.width  = width;
            this.height = height;
        }

		public SvgRect(string str)
		{
			string replacedStr = Regex.Replace(str, @"(\s|,)+", ",");
			string[] tokens = replacedStr.Split(new char[]{','});
			if (tokens.Length == 2)
			{
				this.x      = 0;
				this.y      = 0;
				this.width  = SvgNumber.ParseNumber(tokens[0]);
				this.height = SvgNumber.ParseNumber(tokens[1]);
			}
            else if (tokens.Length == 4)
            {
                this.x      = SvgNumber.ParseNumber(tokens[0]);
                this.y      = SvgNumber.ParseNumber(tokens[1]);
                this.width  = SvgNumber.ParseNumber(tokens[2]);
                this.height = SvgNumber.ParseNumber(tokens[3]);
            }
			else
			{
				throw new SvgException(SvgExceptionType.SvgInvalidValueErr, 
                    "Invalid SvgRect value: " + str);
			}
		}

        #endregion

		#region Public Properties

		public bool IsEmpty
		{
			get
			{
				return (width <= 0 || height <= 0);
			}
		}

		#endregion

        #region Public Methods

        public override string ToString()
		{
            return ("{X=" + this.X.ToString(CultureInfo.CurrentCulture) 
                + ",Y=" + this.Y.ToString(CultureInfo.CurrentCulture) 
                + ",Width=" + this.Width.ToString(CultureInfo.CurrentCulture) 
                + ",Height=" + this.Height.ToString(CultureInfo.CurrentCulture) + "}");
        }

        #endregion

        #region ISvgRect Interface

        public double X
		{
			get
			{
				return x;
			}
			set
			{
				x = value;
			}
		}

		public double Y
		{
			get
			{
				return y;
			}
			set
			{
				y = value;
			}
		}

		public double Width
		{
			get
			{
				return width;
			}
			set
			{
				width = value;
			}
		}

		public double Height
		{
			get
			{
				return height;
			}
			set
			{
				height = value;
			}
		}

		#endregion
	}
}