SvgUse.cs 3.42 KB
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using System;
using System.Collections.Generic;
using System.Text;
using System.Web;
using System.Xml;
using System.Xml.Serialization;
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using System.Drawing.Drawing2D;
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namespace Svg
{
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    [SvgElement("use")]
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    public class SvgUse : SvgVisualElement
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    {
        private Uri _referencedElement;

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        [SvgAttribute("href", SvgAttributeAttribute.XLinkNamespace)]
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        public virtual Uri ReferencedElement
        {
            get { return this._referencedElement; }
            set { this._referencedElement = value; }
        }

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        [SvgAttribute("x")]
        public virtual SvgUnit X
        {
            get { return this.Attributes.GetAttribute<SvgUnit>("x"); }
            set { this.Attributes["x"] = value; }
        }

        [SvgAttribute("y")]
        public virtual SvgUnit Y
        {
            get { return this.Attributes.GetAttribute<SvgUnit>("y"); }
            set { this.Attributes["y"] = value; }
        }

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        /// <summary>
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        /// Applies the required transforms to <see cref="ISvgRenderer"/>.
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        /// </summary>
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        /// <param name="renderer">The <see cref="ISvgRenderer"/> to be transformed.</param>
        protected internal override bool PushTransforms(ISvgRenderer renderer)
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        {
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            if (!base.PushTransforms(renderer)) return false;
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            renderer.TranslateTransform(this.X.ToDeviceValue(renderer, UnitRenderingType.Horizontal, this),
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                                        this.Y.ToDeviceValue(renderer, UnitRenderingType.Vertical, this));
            return true;
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        }

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        /// <summary>
        /// Initializes a new instance of the <see cref="SvgUse"/> class.
        /// </summary>
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        public SvgUse()
        {
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            this.X = 0;
            this.Y = 0;
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        }

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        public override System.Drawing.Drawing2D.GraphicsPath Path(ISvgRenderer renderer)
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        {
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            SvgVisualElement element = (SvgVisualElement)this.OwnerDocument.IdManager.GetElementById(this.ReferencedElement);
            return (element != null) ? element.Path(renderer) : null;
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        }

        public override System.Drawing.RectangleF Bounds
        {
            get { return new System.Drawing.RectangleF(); }
        }

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        protected override bool Renderable { get { return false; } }

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        protected override void Render(ISvgRenderer renderer)
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        {
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            if (this.Visible && this.Displayable && this.PushTransforms(renderer))
            {
                this.SetClip(renderer);

                var element = (SvgVisualElement)this.OwnerDocument.IdManager.GetElementById(this.ReferencedElement);
                if (element != null)
                {
                    var origParent = element.Parent;
                    element._parent = this;
                    element.RenderElement(renderer);
                    element._parent = origParent;
                }

                this.ResetClip(renderer);
                this.PopTransforms(renderer);
            }
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        }
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        public override SvgElement DeepCopy()
        {
            return DeepCopy<SvgUse>();
        }
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        public override SvgElement DeepCopy<T>()
        {
            var newObj = base.DeepCopy<T>() as SvgUse;
            newObj.ReferencedElement = this.ReferencedElement;
            newObj.X = this.X;
            newObj.Y = this.Y;
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            return newObj;
        }
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    }
}