SvgEllipse.cs 4.45 KB
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using System;
using System.Collections.Generic;
using System.Text;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Xml;
using System.ComponentModel;

namespace Svg
{
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    /// <summary>
    /// Represents and SVG ellipse element.
    /// </summary>
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    [SvgElement("ellipse")]
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    public class SvgEllipse : SvgVisualElement
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    {
        private SvgUnit _radiusX;
        private SvgUnit _radiusY;
        private SvgUnit _centerX;
        private SvgUnit _centerY;
        private GraphicsPath _path;

        [SvgAttribute("cx")]
        public virtual SvgUnit CenterX
        {
            get { return this._centerX; }
            set
            {
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            	if(_centerX != value)
            	{
            		this._centerX = value;
            		this.IsPathDirty = true;
            		OnAttributeChanged(new AttributeEventArgs{ Attribute = "cx", Value = value });
            	}
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            }
        }

        [SvgAttribute("cy")]
        public virtual SvgUnit CenterY
        {
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        	get { return this._centerY; }
        	set
        	{
        		if(_centerY != value)
        		{
        			this._centerY = value;
        			this.IsPathDirty = true;
        			OnAttributeChanged(new AttributeEventArgs{ Attribute = "cy", Value = value });
        		}
        	}
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        }

        [SvgAttribute("rx")]
        public virtual SvgUnit RadiusX
        {
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        	get { return this._radiusX; }
        	set
        	{
        		if(_radiusX != value)
        		{
        			this._radiusX = value;
        			this.IsPathDirty = true;
        			OnAttributeChanged(new AttributeEventArgs{ Attribute = "rx", Value = value });
        		}
        	}
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        }

        [SvgAttribute("ry")]
        public virtual SvgUnit RadiusY
        {
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        	get { return this._radiusY; }
        	set
        	{
        		if(_radiusY != value)
        		{
        			this._radiusY = value;
        			this.IsPathDirty = true;
        			OnAttributeChanged(new AttributeEventArgs{ Attribute = "ry", Value = value });
        		}
        	}
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        }

        /// <summary>
        /// Gets or sets a value to determine if anti-aliasing should occur when the element is being rendered.
        /// </summary>
        /// <value></value>
        protected override bool RequiresSmoothRendering
        {
            get { return true; }
        }

        /// <summary>
        /// Gets the bounds of the element.
        /// </summary>
        /// <value>The bounds.</value>
        public override RectangleF Bounds
        {
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            get { return this.Path(null).GetBounds(); }
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        }

        /// <summary>
        /// Gets the <see cref="GraphicsPath"/> for this element.
        /// </summary>
        /// <value></value>
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        public override GraphicsPath Path(SvgRenderer renderer)
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        {
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            if (this._path == null || this.IsPathDirty)
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            {
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                var center = SvgUnit.GetDevicePoint(this._centerX, this._centerY, renderer, this);
                var radius = SvgUnit.GetDevicePoint(this._radiusX, this._radiusY, renderer, this);
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                this._path = new GraphicsPath();
                _path.StartFigure();
                _path.AddEllipse(center.X - radius.X, center.Y - radius.Y, 2 * radius.X, 2 * radius.Y);
                _path.CloseFigure();
                this.IsPathDirty = false;
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            }
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            return _path;
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        }

        /// <summary>
        /// Renders the <see cref="SvgElement"/> and contents to the specified <see cref="Graphics"/> object.
        /// </summary>
        /// <param name="graphics">The <see cref="Graphics"/> object to render to.</param>
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        protected override void Render(SvgRenderer renderer)
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        {
            if (this._radiusX.Value > 0.0f && this._radiusY.Value > 0.0f)
            {
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                base.Render(renderer);
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            }
        }

        /// <summary>
        /// Initializes a new instance of the <see cref="SvgEllipse"/> class.
        /// </summary>
        public SvgEllipse()
        {
        }
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		public override SvgElement DeepCopy()
		{
			return DeepCopy<SvgEllipse>();
		}

		public override SvgElement DeepCopy<T>()
		{
			var newObj = base.DeepCopy<T>() as SvgEllipse;
			newObj.CenterX = this.CenterX;
			newObj.CenterY = this.CenterY;
			newObj.RadiusX = this.RadiusX;
			newObj.RadiusY = this.RadiusY;
			return newObj;
		}
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    }
}