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SvgCircle.cs 3.94 KiB
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using System;
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using System.Collections.Generic;
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using System.Text;
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using System.Drawing;
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using System.Drawing.Drawing2D;
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using System.Xml;
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using System.Web.UI.WebControls;
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using System.ComponentModel;
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namespace Svg
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{
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    /// <summary>
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    /// An SVG element to render circles to the document.
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    /// </summary>
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    [SvgElement("circle")]
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    public class SvgCircle : SvgVisualElement
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    {
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        private GraphicsPath _path;
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        private SvgUnit _radius;
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        private SvgUnit _centerX;
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        private SvgUnit _centerY;
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        /// <summary>
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        /// Gets the center point of the circle.
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        /// </summary>
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        /// <value>The center.</value>
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        public SvgPoint Center
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        {
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            get { return new SvgPoint(this.CenterX, this.CenterY); }
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        }
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        [SvgAttribute("cx")]
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        public virtual SvgUnit CenterX
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        {
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            get { return this._centerX; }
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            set
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            {
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                this._centerX = value;
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                this.IsPathDirty = true;
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            }
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        }
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        [SvgAttribute("cy")]
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        public virtual SvgUnit CenterY
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        {
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            get { return this._centerY; }
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            set
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            {
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                this._centerY = value;
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                this.IsPathDirty = true;
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            }
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        }
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        [SvgAttribute("r")]
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        public virtual SvgUnit Radius
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        {
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            get { return this._radius; }
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            set { this._radius = value; this.IsPathDirty = true; }
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        }
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        /// <summary>
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        /// Gets the bounds of the circle.
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        /// </summary>
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        /// <value>The rectangular bounds of the circle.</value>
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        public override RectangleF Bounds
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        {
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            get { return this.Path.GetBounds(); }
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        }
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/// <summary> /// Gets a value indicating whether the circle requires anti-aliasing when being rendered. /// </summary> /// <value> /// <c>true</c> if the circle requires anti-aliasing; otherwise, <c>false</c>. /// </value> protected override bool RequiresSmoothRendering { get { return true; } } /// <summary> /// Gets the <see cref="GraphicsPath"/> representing this element. /// </summary> public override GraphicsPath Path { get { if (this._path == null || this.IsPathDirty) { _path = new GraphicsPath(); _path.StartFigure(); _path.AddEllipse(this.Center.ToDeviceValue().X - this.Radius.ToDeviceValue(), this.Center.ToDeviceValue().Y - this.Radius.ToDeviceValue(), 2 * this.Radius.ToDeviceValue(), 2 * this.Radius.ToDeviceValue()); _path.CloseFigure(); this.IsPathDirty = false; } return _path; } } /// <summary> /// Renders the circle to the specified <see cref="Graphics"/> object. /// </summary> /// <param name="graphics">The graphics object.</param> protected override void Render(SvgRenderer renderer) { // Don't draw if there is no radius set if (this.Radius.Value > 0.0f) { base.Render(renderer); } } /// <summary> /// Initializes a new instance of the <see cref="SvgCircle"/> class. /// </summary> public SvgCircle() { CenterX = new SvgUnit(0.0f); CenterY = new SvgUnit(0.0f); } public override SvgElement DeepCopy() { return DeepCopy<SvgCircle>(); } public override SvgElement DeepCopy<T>() { var newObj = base.DeepCopy<T>() as SvgCircle; newObj.CenterX = this.CenterX; newObj.CenterY = this.CenterY; newObj.Radius = this.Radius; return newObj; } } }