C# Media.DrawingVisual类代码示例

        public void CreateBitmap()
        {
            int width = 100;
            int height = 100;
            int dpi = 96;

            Tracing.Log(">> CreateBitmap");
            var thread = new Thread(new ThreadStart(() => 
            {
                Tracing.Log(">> CreateBitmap - Thread start; creating drawing visual");
                //Dispatcher.Invoke(new Action(() => {
                _drawingVisual = new DrawingVisual();
                _drawingContext = _drawingVisual.RenderOpen();
                //}));

                Tracing.Log(">> CreateBitmap - Drawing to context");
                _drawingContext.DrawRectangle(new SolidColorBrush(Colors.HotPink), new Pen(), new Rect(0, 0, 50, 50));
                _drawingContext.DrawRectangle(new SolidColorBrush(Colors.Blue), new Pen(), new Rect(50, 0, 50, 50));
                _drawingContext.DrawRectangle(new SolidColorBrush(Colors.Orange), new Pen(), new Rect(0, 50, 50, 50));
                _drawingContext.DrawRectangle(new SolidColorBrush(Colors.DarkRed), new Pen(), new Rect(50, 50, 50, 50));
                _drawingContext.Close();

                Tracing.Log(">> CreateBitmap - Finished drawing; creating render target bitmap");
                _bitmap = new RenderTargetBitmap(width, height, dpi, dpi, PixelFormats.Default);
                _bitmap.Render(_drawingVisual);
                Tracing.Log(">> CreateBitmap - Finished work");
                _bitmap.Freeze();
            }));
            //thread.IsBackground = true;
            thread.SetApartmentState(ApartmentState.STA);
            thread.Start();
        }

        private void ButtonSave_Click(object sender, RoutedEventArgs e)
        {
            var rect = new Rect { Width = 512, Height = 384 };
            var dv = new DrawingVisual();

            var dc = dv.RenderOpen();
            dc.PushTransform(new TranslateTransform(-rect.X, -rect.Y));
            dc.DrawRectangle(InkCanvasMain.Background, null, rect);
            InkCanvasMain.Strokes.Draw(dc);
            dc.Close();

            var rtb = new RenderTargetBitmap((int)rect.Width, (int)rect.Height, 96, 96, PixelFormats.Default);
            rtb.Render(dv);
            var enc = new PngBitmapEncoder();
            enc.Frames.Add(BitmapFrame.Create(rtb));

            var fn = TextBoxFileName.Text;
            if (!fn.EndsWith(".png", StringComparison.OrdinalIgnoreCase)) fn += ".png";
            using (Stream s = File.Create(TegakiImageFolder + "/" + fn))
            {
                enc.Save(s);
            }
            ((TegakiWindowViewModel)DataContext).AddToMediaList(System.IO.Path.GetFullPath(TegakiImageFolder + "/" + fn));
            Close();
        }

 private void RenderMyVisual(DrawingVisual v)
 {
     using (var dc = v.RenderOpen())
     {
         RenderRectangles(dc);
     }
 }

        public DrawGraphicsOnBitmap()
        {
            Title = "Draw Graphics on Bitmap";

            // ��Ʈ���� ������� �����ϱ� ���� ����� ������.
            Background = Brushes.Khaki;

            // RenderTargetBitmap ������.
            RenderTargetBitmap renderbitmap = new RenderTargetBitmap(100, 100, 96, 96, PixelFormats.Default);

            // DrawingVisual ��ü�� ������.
            DrawingVisual drawvis = new DrawingVisual();
            DrawingContext dc = drawvis.RenderOpen();      // Render �޼ҵ� ȣ��
            dc.DrawRoundedRectangle(Brushes.Blue, new Pen(Brushes.Red, 10),
                                    new Rect(25, 25, 50, 50), 10, 10);
            dc.Close();

            // RenderTargetBitmap ���� DrawingVisual ��ü�� �׸�.
            renderbitmap.Render(drawvis);

            // �̹��� ��ä ���� -> ������Ƽ ����
            Image img = new Image();
            img.Source = renderbitmap;

            // ���
            Content = img;
        }

        protected override Effect GetEffect(FastBitmap source)
        {
            // Fill temporary graphics buffer with mask (currently always a rectangle).
            DrawingVisual dv = new DrawingVisual
            {
                Effect = new BlurEffect
                {
                    Radius = Radius,
                    KernelType = KernelType.Gaussian
                }
            };

            DrawingContext dc = dv.RenderOpen();
            dc.DrawImage(source.InnerBitmap, new Rect(0, 0, source.Width, source.Height));
            dc.Close();

            RenderTargetBitmap rtb = RenderTargetBitmapUtility.CreateRenderTargetBitmap(source.Width, source.Height);
            rtb.Render(dv);

            Brush blurredImage = new ImageBrush(rtb);

            return new UnsharpMaskEffect
            {
                BlurMask = blurredImage,
                Amount = Amount / 100.0,
                Threshold = Threshold
            };
        }

        public static RenderTargetBitmap GetImage(UIElement fe, Brush background = null, Size sz = default(Size), int dpi = 144)
        {
            if (sz.Width < alib.Math.math.ε || sz.Height < alib.Math.math.ε)
            {
                fe.Measure(util.infinite_size);
                sz = fe.DesiredSize; //VisualTreeHelper.GetContentBounds(fe).Size; //
            }

            DrawingVisual dv = new DrawingVisual();
            RenderOptions.SetEdgeMode(dv, EdgeMode.Aliased);

            using (DrawingContext ctx = dv.RenderOpen())
            {
                Rect r = new Rect(0, 0, sz.Width, sz.Height);
                if (background != null)
                    ctx.DrawRectangle(background, null, r);

                VisualBrush br = new VisualBrush(fe);
                br.AutoLayoutContent = true;
                ctx.DrawRectangle(br, null, r);
            }

            Double f = dpi / 96.0;

            RenderTargetBitmap bitmap = new RenderTargetBitmap(
                (int)(sz.Width * f) + 1,
                (int)(sz.Height * f) + 1,
                dpi,
                dpi,
                PixelFormats.Pbgra32);
            bitmap.Render(dv);
            return bitmap;
        }

        protected override sealed void CreateImage()
        {
            base.CreateImage();

            Rect bounds = new Rect(StrokeWidth / 2, StrokeWidth / 2,
                CalculatedWidth - StrokeWidth,
                CalculatedHeight - StrokeWidth);
            Brush brush = Fill.GetBrush();

            PointCollection points = GetPoints(bounds);
            PathGeometry geometry = CanonicalSplineHelper.CreateSpline(points, Roundness / 100.0, null, true, true, 0.25);

            Pen pen = GetPen();

            DrawingVisual dv = new DrawingVisual();
            DrawingContext dc = dv.RenderOpen();

            // Draw polygon.
            dc.DrawGeometry(brush, pen, geometry);

            dc.Close();

            RenderTargetBitmap rtb = RenderTargetBitmapUtility.CreateRenderTargetBitmap(CalculatedWidth, CalculatedHeight);
            rtb.Render(dv);
            Bitmap = new FastBitmap(rtb);
        }

        /// <summary>
        /// Applies the filter to the specified <paramref name="bitmap"/>. This method
        /// first calls <see cref="ImageReplacementFilter.GetDestinationDimensions(FastBitmap, out Int32, out Int32)" />
        /// to calculate the size of the destination image. Then it calls
        /// <see cref="ImageReplacementFilter.ApplyFilter(FastBitmap, DrawingContext, int, int)" /> 
        /// which is where the overridden class implements its filter algorithm.
        /// </summary>
        /// <param name="bitmap">
        /// Image to apply the <see cref="ImageReplacementFilter" /> to.
        /// </param>
        public override sealed void ApplyFilter(FastBitmap bitmap)
        {
            OnBeginApplyFilter(bitmap);

            // get destination dimensions
            int width, height;
            bool shouldContinue = GetDestinationDimensions(bitmap, out width, out height);
            if (!shouldContinue)
                return;

            DrawingVisual dv = new DrawingVisual();
            ConfigureDrawingVisual(bitmap, dv);

            DrawingContext dc = dv.RenderOpen();

            ApplyFilter(bitmap, dc, width, height);
            dc.Close();

            RenderTargetBitmap rtb = RenderTargetBitmapUtility.CreateRenderTargetBitmap(width, height);
            rtb.Render(dv);
            FastBitmap destination = new FastBitmap(rtb);

            // copy metadata
            // TODO
            /*foreach (PropertyItem propertyItem in bitmap.InnerBitmap.PropertyItems)
                destination.InnerBitmap.SetPropertyItem(propertyItem);*/

            // set new image
            bitmap.InnerBitmap = destination.InnerBitmap;

            OnEndApplyFilter();
        }

 public VisualPaginator(DrawingVisual source, Size printSize, Thickness pageMargins, Thickness originalMargin)
 {
     DrawingVisual = source;
     _printSize = printSize;
     PageMargins = pageMargins;
     _originalMargin = originalMargin;
 }

        private ImageSource CreateImage(CustomMaterial material)
        {
            var bitmapSourceBackground = material.FlyerFrontSide.ToBitmapImage();

            var visual = new DrawingVisual();
            using (var drawingContext = visual.RenderOpen())
            {
                drawingContext.PushClip(new RectangleGeometry(new Rect(0, 0, bitmapSourceBackground.Width, bitmapSourceBackground.Height)));

                drawingContext.DrawImage(bitmapSourceBackground, new Rect(0, 0, bitmapSourceBackground.Width, bitmapSourceBackground.Height));

                foreach (var textField in material.MaterialFields.Select(materialToTextFieldConverter.CreateTextField))
                {
                    drawingContext.DrawText(textField.FormattedText, textField.Origin);
                }

                if (material.CustomLogo.HasLogo)
                {
                    var flyerLogo = material.CustomLogo.Logo.ToBitmapImage();
                    drawingContext.DrawImage(flyerLogo, new Rect(material.CustomLogo.LogoLeftMargin, material.CustomLogo.LogoTopMargin, material.CustomLogo.LogoWidth, material.CustomLogo.LogoHeight));
                }
            }
            var image = new DrawingImage(visual.Drawing);

            image.Freeze();
            return image;
        }

        internal static void DrawContextualMenu(DrawingVisual drawingVisual, Dictionary<int, string> itemsList)
        {
            //draw the stuff

            //3 cases
            //menu items == 7
            //menu items < 7
            //menu items > 7

            DrawingContext context = drawingVisual.RenderOpen();
            int itemsCount = itemsList.Count;
            if (itemsCount == 7)
            {

            }

            if (itemsCount < 7)
            {

            }

            if (itemsCount > 7)
            {

            }
            // position the menu correctly
        }

        /// <summary>
        /// Construct new SelectionRectVisual object for the given rectangle
        /// </summary>
        public SelectionRectVisual(Point firstPointP, Point secondPointP, double zoomP)
        {
            DrawingGroup drawing = new DrawingGroup();
            DrawingContext context = drawing.Open();
            context.DrawRectangle(Brushes.White, null, new Rect(-1, -1, 3, 3));
            context.DrawRectangle(Brushes.Black, null, new Rect(0.25, -1, 0.5, 3));
            context.Close();
            drawing.Freeze();

            // Create a drawing brush that tiles the unit square from the drawing created above.
            // The size of the viewport and the rotation angle will be updated as we use the
            // dashed pen.
            DrawingBrush drawingBrush = new DrawingBrush(drawing);
            drawingBrush.ViewportUnits = BrushMappingMode.Absolute;
            drawingBrush.Viewport = new Rect(0, 0, _dashRepeatLength, _dashRepeatLength);
            drawingBrush.ViewboxUnits = BrushMappingMode.Absolute;
            drawingBrush.Viewbox = new Rect(0, 0, 1, 1);
            drawingBrush.Stretch = Stretch.Uniform;
            drawingBrush.TileMode = TileMode.Tile;

            // Store the drawing brush and a copy that's rotated by 90 degrees.
            _horizontalDashBrush = drawingBrush;
            _verticalDashBrush = drawingBrush.Clone();
            _verticalDashBrush.Transform = new RotateTransform(90);

            this._firstPoint = firstPointP;
            this._secondPoint = secondPointP;
            this._zoom = zoomP;
            _visualForRect = new DrawingVisual();
            this.AddVisualChild(_visualForRect);
            this.AddLogicalChild(_visualForRect);      
        }

        protected override void OnDrawMouseHover()
        {
            if (this.mouseHoverVisual != null)
            {
                this.Visuals.Remove(this.mouseHoverVisual);
                this.RemoveVisualChild(this.mouseHoverVisual);
            }

            var mouseHoverTileCoords = this.HoverTile;
            if (mouseHoverTileCoords.X < 0 || mouseHoverTileCoords.Y < 0)
            {
                this.mouseHoverVisual = null;
            }
            else
            {
                this.mouseHoverVisual = new DrawingVisual();
                var tileRect = this.GetTileRectangleFromTilePoint(mouseHoverTileCoords);

                using (var drawingContext = this.mouseHoverVisual.RenderOpen())
                {
                    if (this.DrawPressedTile)
                    {
                        drawingContext.DrawImage(this.tileSetImage, tileRect);
                    }
                    else
                    {
                        drawingContext.DrawRectangle(this.HoverBrush, null, tileRect);
                    }
                }

                this.Visuals.Add(this.mouseHoverVisual);
                this.AddVisualChild(this.mouseHoverVisual);
            }
        }

        public WaveGraph()
        {
            InitializeComponent();
            DrawingVisual ghostVisual;

            Width = 300;
            Height = 350;
            ghostVisual = new DrawingVisual();
            using (DrawingContext dc = ghostVisual.RenderOpen())
            {

                dc.DrawEllipse(Brushes.Black, new Pen(Brushes.Red, 10),
                new Point(95, 95), 15, 15);

                dc.DrawEllipse(Brushes.Black, new Pen(Brushes.Red, 10),
                new Point(170, 105), 15, 15);

                Pen p = new Pen(Brushes.Black, 10);
                p.StartLineCap = PenLineCap.Round;
                p.EndLineCap = PenLineCap.Round;
                dc.DrawLine(p, new Point(75, 160), new Point(175, 150));
            }

            this.AddVisualChild(ghostVisual);
            this.AddLogicalChild(ghostVisual);
        }

        public RadialMenu(uint nodeId, Point worldCoords, double radius, Dictionary<int, string> items,
            double startAngle, NodePart part)
        {
            this.startAngle = startAngle * Math.PI / 180;
            this.endAngle = (startAngle - 90) * Math.PI / 180; // 90: the radial menu is a quadrant
            this.nodePart = part;
            this.worldCoords = worldCoords;
            this.nodeId = nodeId;
            this.radius = radius;

            radialMenuVisual = new DrawingVisual();
            radialMenuVisual.Transform = new TranslateTransform(worldCoords.X, worldCoords.Y);

            SetAnchor();
            itemsList = items;
            reducedList = items;

            InitializeMenuItems();

            UpdateItemsArrangement(-1);
            InitializeItemWeight();

            ValidateScrollers();
            Compose();
        }