C# DrawingGroup.SetValue方法代码示例

        public override void BeforeRender(WpfDrawingRenderer renderer)
        {
            base.BeforeRender(renderer);

            WpfDrawingContext context = renderer.Context;
            _drawGroup = new DrawingGroup();

            string elementId = this.GetElementName();
            if (!String.IsNullOrEmpty(elementId) && !context.IsRegisteredId(elementId))
            {
                _drawGroup.SetValue(FrameworkElement.NameProperty, elementId);

                context.RegisterId(elementId);

                if (context.IncludeRuntime)
                {
                    SvgObject.SetId(_drawGroup, elementId);
                }
            }

            DrawingGroup currentGroup = context.Peek();

            if (currentGroup == null)
            {
                throw new InvalidOperationException("An existing group is expected.");
            }

            currentGroup.Children.Add(_drawGroup);
            context.Push(_drawGroup);
        }

 public static void RemoveObjectNames(DrawingGroup drawingGroup)
 {
     if (drawingGroup.GetValue(FrameworkElement.NameProperty) != null)
         drawingGroup.SetValue(FrameworkElement.NameProperty, null);
     foreach (var child in drawingGroup.Children.OfType<DependencyObject>())
     {
         if (child.GetValue(FrameworkElement.NameProperty) != null)
             child.SetValue(FrameworkElement.NameProperty, null);
         if (child is DrawingGroup)
             RemoveObjectNames(child as DrawingGroup);
     }
 }

        public override void BeforeRender(WpfDrawingRenderer renderer)
        {
            _isTextPath   = false;
            _isGroupAdded = false;
            _textWidth    = 0;
            _isMeasuring  = false;

            WpfDrawingContext context = renderer.Context;

            SvgRenderingHint hint = _svgElement.RenderingHint;
            if (hint == SvgRenderingHint.Clipping)
            {
                return;
            }
            // We do not directly render the contents of the clip-path, unless specifically requested...
            if (String.Equals(_svgElement.ParentNode.LocalName, "clipPath") &&
                !context.RenderingClipRegion)
            {
                return;
            }

            string sVisibility = _textElement.GetPropertyValue("visibility");
            string sDisplay    = _textElement.GetPropertyValue("display");
            if (String.Equals(sVisibility, "hidden") || String.Equals(sDisplay, "none"))
            {
                return;
            }

            _context = renderer.Context;

            SetQuality(context);
            SetTransform(context);

            SetClip(_context);

            SetMask(_context);

            _drawGroup = new DrawingGroup();

            string elementId = this.GetElementName();
            if (!String.IsNullOrEmpty(elementId) && !context.IsRegisteredId(elementId))
            {
                _drawGroup.SetValue(FrameworkElement.NameProperty, elementId);

                context.RegisterId(elementId);

                if (context.IncludeRuntime)
                {
                    SvgObject.SetId(_drawGroup, elementId);
                }
            }

            Transform textTransform = this.Transform;
            if (textTransform != null && !textTransform.Value.IsIdentity)
            {
                _drawGroup.Transform = textTransform;
            }
            else
            {
                textTransform = null; // render any identity transform useless...
            }
            Geometry textClip = this.ClipGeometry;
            if (textClip != null && !textClip.IsEmpty())
            {
                _drawGroup.ClipGeometry = textClip;
            }
            else
            {
                textClip = null; // render any empty geometry useless...
            }
            Brush textMask = this.Masking;
            if (textMask != null)
            {
                _drawGroup.OpacityMask = textMask;
            }

            if (textTransform != null || textClip != null || textMask != null)
            {
                DrawingGroup curGroup = _context.Peek();
                Debug.Assert(curGroup != null);
                if (curGroup != null)
                {
                    curGroup.Children.Add(_drawGroup);
                    context.Push(_drawGroup);

                    _isGroupAdded = true;
                }
            }

            _drawContext = _drawGroup.Open();

            _horzRenderer.Initialize(_drawContext, _context);
            _vertRenderer.Initialize(_drawContext, _context);
            _pathRenderer.Initialize(_drawContext, _context);
        }

        public override void Render(WpfDrawingRenderer renderer)
        {
            _isAggregated = false;

            if (_isLayer)
            {
                base.Render(renderer);

                return;
            }

            WpfDrawingContext context = renderer.Context;

            Geometry clipGeom   = this.ClipGeometry;
            Transform transform = this.Transform;

            float opacityValue  = -1;

            SvgAElement element = (SvgAElement)_svgElement;
            string opacity = element.GetPropertyValue("opacity");
            if (opacity != null && opacity.Length > 0)
            {
                opacityValue = (float)SvgNumber.ParseNumber(opacity);
                opacityValue = Math.Min(opacityValue, 1);
                opacityValue = Math.Max(opacityValue, 0);
            }

            WpfLinkVisitor linkVisitor = context.LinkVisitor;

            if (linkVisitor != null || clipGeom != null || transform != null || opacityValue >= 0)
            {
                _drawGroup = new DrawingGroup();

                string elementId = this.GetElementName();
                if (!String.IsNullOrEmpty(elementId) && !context.IsRegisteredId(elementId))
                {
                    _drawGroup.SetValue(FrameworkElement.NameProperty, elementId);

                    context.RegisterId(elementId);

                    if (context.IncludeRuntime)
                    {
                        SvgObject.SetId(_drawGroup, elementId);
                    }
                }

                DrawingGroup currentGroup = context.Peek();

                if (currentGroup == null)
                {
                    throw new InvalidOperationException("An existing group is expected.");
                }

                if (linkVisitor != null && linkVisitor.Aggregates && context.Links != null)
                {
                    if (!linkVisitor.Exists(elementId))
                    {
                        context.Links.Children.Add(_drawGroup);
                    }
                }
                else
                {
                    currentGroup.Children.Add(_drawGroup);
                }

                context.Push(_drawGroup);

                if (clipGeom != null)
                {
                    _drawGroup.ClipGeometry = clipGeom;
                }

                if (transform != null)
                {
                    _drawGroup.Transform = transform;
                }

                if (opacityValue >= 0)
                {
                    _drawGroup.Opacity = opacityValue;
                }

                if (linkVisitor != null)
                {
                    linkVisitor.Visit(_drawGroup, element, context, opacityValue);

                    _isAggregated = linkVisitor.IsAggregate;
                }
            }

            base.Render(renderer);
        }

        public override void BeforeRender(WpfDrawingRenderer renderer)
        {
            base.BeforeRender(renderer);

            WpfDrawingContext context = renderer.Context;
            _drawGroup = new DrawingGroup();

            if (context.Count == 0)
            {
                context.Push(_drawGroup);
                context.Root = _drawGroup;
            }
            else if (context.Count == 1)
            {
                DrawingGroup currentGroup = context.Peek();

                if (currentGroup == null)
                {
                    throw new InvalidOperationException("An existing group is expected.");
                }
                if (currentGroup == context.Root && !context.IsFragment)
                {
                    _drawGroup.SetValue(FrameworkElement.NameProperty, SvgObject.DrawLayer);
                    if (context.IncludeRuntime)
                    {
                        SvgLink.SetKey(_drawGroup, SvgObject.DrawLayer);
                    }
                }

                currentGroup.Children.Add(_drawGroup);
                context.Push(_drawGroup);
            }
            else
            {
                DrawingGroup currentGroup = context.Peek();

                if (currentGroup == null)
                {
                    throw new InvalidOperationException("An existing group is expected.");
                }

                currentGroup.Children.Add(_drawGroup);
                context.Push(_drawGroup);
            }

            SvgSvgElement svgElm = (SvgSvgElement)_svgElement;

            double x      = Math.Round(svgElm.X.AnimVal.Value,      4);
            double y      = Math.Round(svgElm.Y.AnimVal.Value,      4);
            double width  = Math.Round(svgElm.Width.AnimVal.Value,  4);
            double height = Math.Round(svgElm.Height.AnimVal.Value, 4);

            Rect elmRect  = new Rect(x, y, width, height);

            //if (element.ParentNode is SvgElement)
            //{
            //    // TODO: should it be moved with x and y?
            //}

            XmlNode parentNode = _svgElement.ParentNode;

            //if (parentNode.NodeType == XmlNodeType.Document)
            {
                ISvgFitToViewBox fitToView = svgElm as ISvgFitToViewBox;
                if (fitToView != null)
                {
                    ISvgAnimatedRect animRect = fitToView.ViewBox;
                    if (animRect != null)
                    {
                        ISvgRect viewRect = animRect.AnimVal;
                        if (viewRect != null)
                        {
                            Rect wpfViewRect = WpfConvert.ToRect(viewRect);
                            if (!wpfViewRect.IsEmpty && wpfViewRect.Width > 0 && wpfViewRect.Height > 0)
                            {
                                elmRect = wpfViewRect;
                            }
                        }
                    }
                }
            }

            Transform transform = null;
            if (parentNode.NodeType != XmlNodeType.Document)
            {
                FitToViewbox(context, elmRect);

                transform = this.Transform;
                if (transform != null)
                {
                    _drawGroup.Transform = transform;
                }
            }

            //if (height > 0 && width > 0)
            //{
            //    ClipGeometry = new RectangleGeometry(elmRect);
            //}
            //Geometry clipGeom = this.ClipGeometry;
            //if (clipGeom != null)
//.........这里部分代码省略.........

        /// <summary>
        /// Returns the thumbnail image for use outside of the control. 
        /// </summary>
        /// <param name="width">Required width of the bitmap</param>
        /// <param name="height">Required height of the bitmap</param>
        /// <returns>The bitmap depicting the thumbnail.</returns>
        public Image GetImage(int width = THUMB_WIDTH, int height = THUMB_HEIGHT)
        {
            var drawing = new DrawingGroup();
            drawing.SetValue(RenderOptions.BitmapScalingModeProperty, BitmapScalingMode.HighQuality);
            using (var context = drawing.Open())
            {
                DrawThumb(context, width, height);
            }

            return Booster.DrawingToBitmap(drawing, width, height);
        }