C# Media.VisualBrush类代码示例

 /// <summary>
 /// Constructor.
 /// </summary>
 /// <param name="pieceNumber">Which piece number this piece contains.</param>
 /// <param name="pieceShape">The shape of the pieces.</param>
 /// <param name="brush">The image and viewbox to use as this piece's visual.</param>
 public PuzzlePiece(int pieceNumber, Geometry pieceShape, VisualBrush brush) 
 {
     clipShape = pieceShape;
     imageBrush = brush;
     pieces = new HashSet<int>();
     pieces.Add(pieceNumber);
 }

        public DragAdorner(UIElement owner, UIElement adornElement, bool useVisualBrush, double opacity)
            : base(owner)
        {
            System.Diagnostics.Debug.Assert(owner != null);
            System.Diagnostics.Debug.Assert(adornElement != null);
            _owner = owner;
            if (useVisualBrush)
            {
                VisualBrush _brush = new VisualBrush(adornElement);
                _brush.Opacity = opacity;
                Rectangle r = new Rectangle();
                r.RadiusX = 3;
                r.RadiusY = 3;

                //TODO: questioning DesiredSize vs. Actual 
                r.Width = adornElement.DesiredSize.Width;
                r.Height = adornElement.DesiredSize.Height;

                XCenter = adornElement.DesiredSize.Width / 2;
                YCenter = adornElement.DesiredSize.Height / 2;

                r.Fill = _brush;
                _child = r;

            }
            else
                _child = adornElement;


        }

 private static byte[] GetPngImage(FrameworkElement element)
 {
     var size = new Size(double.PositiveInfinity, double.PositiveInfinity);
     element.Measure(size);
     element.Arrange(new Rect(element.DesiredSize));
     var renderTarget =
       new RenderTargetBitmap((int)element.RenderSize.Width,
                              (int)element.RenderSize.Height,
                              96, 96,
                              PixelFormats.Pbgra32);
     var sourceBrush = new VisualBrush(element);
     var drawingVisual = new DrawingVisual();
     using (DrawingContext drawingContext = drawingVisual.RenderOpen())
     {
         drawingContext.DrawRectangle(
             sourceBrush, null, new Rect(
                                    new Point(0, 0),
                                    new Point(element.RenderSize.Width,
                                    element.RenderSize.Height)));
     }
     renderTarget.Render(drawingVisual);
     var pngEncoder = new PngBitmapEncoder();
     pngEncoder.Frames.Add(BitmapFrame.Create(renderTarget));
     using (var outputStream = new MemoryStream())
     {
         pngEncoder.Save(outputStream);
         return outputStream.ToArray();
     }
 }

        public Tile(ICase tile, TileFactory tileFactory, List<Unite> listUnite, SolidColorBrush playerBrush)
        {
            InitializeComponent();
            this.tile = tile;
            this.nbUnite = listUnite.Count;
            VisualBrush myBrush = new VisualBrush();
            aPanel = new Grid();

            aPanel.Background = tileFactory.getViewTile(tile);

            // Create some text.
            TextBlock backText = new TextBlock();
            Canvas.SetZIndex(backText, 3);
            if (listUnite != null && listUnite.Count > 0)
            {
                backText.Text = " " + listUnite.Count.ToString() + " ";
                backText.Background = (SolidColorBrush)new BrushConverter().ConvertFromString(listUnite[0].Proprietaire.Couleur);
                backText.Foreground = Brushes.White;
            }
            FontSizeConverter fSizeConverter = new FontSizeConverter();
            backText.FontSize = (double)fSizeConverter.ConvertFromString("10pt");
            backText.Margin = new Thickness(10);
            Grid.SetColumn(backText, 0);
            Grid.SetRow(backText, 0);
            DropShadowEffect myDropShadowEffect  = new DropShadowEffect();
            myDropShadowEffect.BlurRadius = 1;
            myDropShadowEffect.Color = Color.FromRgb(0,0,0);
            myDropShadowEffect.ShadowDepth = 2;
            backText.Effect=myDropShadowEffect;
            aPanel.Children.Add(backText);
            myBrush.Visual = aPanel;
            rect.Fill = myBrush;
            rect1.Stroke = playerBrush;
        }

        private static Border BuildGrid(int cellWidth = 50, int cellHeight = 50)
        {
            var gridBorder = new Border();

            var cellRect = new Rectangle
            {
                Stroke = Brushes.DarkGray,
                StrokeThickness = 1,
                Height = 50,
                Width = 50,
                StrokeDashArray = new DoubleCollection(new double[] {5, 3})
            };

            var vb = new VisualBrush(cellRect)
            {
                TileMode = TileMode.Tile,
                Viewport = new System.Windows.Rect(0, 0, cellHeight, cellWidth),
                ViewportUnits = BrushMappingMode.Absolute,
                Viewbox = new System.Windows.Rect(0, 0, cellHeight, cellWidth),
                ViewboxUnits = BrushMappingMode.Absolute
            };
            gridBorder.Background = vb;

            return gridBorder;
        }

        public static TextDecoration Squiggly(Color color, TextDecorationLocation location = TextDecorationLocation.Underline)
        {
            var penVisual = new Path
            {
                Stroke = new SolidColorBrush(color),
                StrokeThickness = 0.2,
                StrokeEndLineCap = PenLineCap.Square,
                StrokeStartLineCap = PenLineCap.Square,
                Data = new PathGeometry(new[] { new PathFigure(new Point(0, 1), new[] { new BezierSegment(new Point(1, 0), new Point(2, 2), new Point(3, 1), true) }, false) })
            };

            var penBrush = new VisualBrush
            {
                Viewbox = new Rect(0, 0, 3, 2),
                ViewboxUnits = BrushMappingMode.Absolute,
                Viewport = new Rect(0, 0.8, 6, 3),
                ViewportUnits = BrushMappingMode.Absolute,
                TileMode = TileMode.Tile,
                Visual = penVisual
            };

            var pen = new Pen
            {
                Brush = penBrush,
                Thickness = 6
            };

            return new TextDecoration(location, pen, 0, TextDecorationUnit.FontRecommended, TextDecorationUnit.FontRecommended);
        }

        public fullscreen(VisualBrush vb, MW_ViewModel vm)
        {
            this.DataContext = vm;
            InitializeComponent();

            display.Fill = vb;
        }

        public ParticleSystem(int maxCount, System.Windows.Media.Color color)
        {
            this.maxParticleCount = maxCount;

            this.particleList = new List<Particle>();

            this.particleModel = new GeometryModel3D();
            this.particleModel.Geometry = new MeshGeometry3D();

            Ellipse e = new Ellipse();
            e.Width = 32.0;
            e.Height = 32.0;
            RadialGradientBrush b = new RadialGradientBrush();
            b.GradientStops.Add(new GradientStop(System.Windows.Media.Color.FromArgb(0xFF, color.R, color.G, color.B), 0.25));
            b.GradientStops.Add(new GradientStop(System.Windows.Media.Color.FromArgb(0x00, color.R, color.G, color.B), 1.0));
            e.Fill = b;
            e.Measure(new System.Windows.Size(32, 32));
            e.Arrange(new Rect(0, 0, 32, 32));

            var brush = new VisualBrush(e);

            DiffuseMaterial material = new DiffuseMaterial(brush);

            this.particleModel.Material = material;

            this.rand = new Random(brush.GetHashCode());
        }

        public DragAdorner(UIElement owner, UIElement adornElement, bool useVisualBrush, double opacity, double scaleRatio)
            : base(owner)
        {
            _owner = owner;
            if (useVisualBrush)
            {
                VisualBrush brush = new VisualBrush(adornElement);
                brush.Opacity = opacity;
                Rectangle r = new Rectangle();
                r.RadiusX = 3;
                r.RadiusY = 3;

                r.Width = adornElement.DesiredSize.Width * scaleRatio;
                r.Height = adornElement.DesiredSize.Height * scaleRatio;

                _xCenter = r.Width / 2;
                _yCenter = r.Height / 2;

                r.Fill = brush;
                _child = r;

            }
            else
                _child = adornElement;
        }

        public DragAdorner(UIElement owner, UIElement adornElement, bool useVisualBrush, double opacity)
            : base(owner)
        {
            Debug.Assert(owner != null);
            Debug.Assert(adornElement != null);
            Owner = owner;
            if (useVisualBrush)
            {
                var brush = new VisualBrush(adornElement) {Opacity = opacity};
                var r = new Rectangle
                            {
                                RadiusX = 3,
                                RadiusY = 3,
                                Width = adornElement.DesiredSize.Width,
                                Height = adornElement.DesiredSize.Height
                            };

                XCenter = adornElement.DesiredSize.Width/2;
                YCenter = adornElement.DesiredSize.Height/2;

                r.Fill = brush;
                Child = r;
            }
            else
                Child = adornElement;
        }

        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;
        }

        public DiagramCanvas()
        {
            this.selectedItems = new List<ISelectable>();

            // Create ParentDiagram grdi visual brush
            //<VisualBrush x:Key="DiagramDotFillBrush"
            //		TileMode="Tile"
            //		Viewport="0,0,10,10"
            //		ViewportUnits="Absolute"
            //		Viewbox="0,0,12,12"
            //		ViewboxUnits="Absolute">
            //	<VisualBrush.Visual>
            //		<Ellipse Fill="#777" Width="1" Height="1" />
            //	</VisualBrush.Visual>
            //</VisualBrush>
            var brushViewport = new Rect(0, 0, DiagramCanvas.DiagramViewPadding, DiagramCanvas.DiagramViewPadding);
            this.diagramGridBrush = new VisualBrush(
                new Ellipse() {
                    Fill = new SolidColorBrush(new Color() {R = 119, G = 119, B = 119, A = 255}),
                    Width = 1.0,
                    Height = 1.0
                }) {
                    TileMode = TileMode.Tile,
                    ViewboxUnits = BrushMappingMode.Absolute,
                    ViewportUnits = BrushMappingMode.Absolute,
                    Viewbox = brushViewport,
                    Viewport = brushViewport
                };
            this.ShowDiagramGrid = true;
            this.StickToDiagramGrid = true;
        }

        public void SaveToPng( Canvas surface, string file )
        {
            // Save current canvas transform
            var transform = surface.LayoutTransform;
            // reset current transform (in case it is scaled or rotated)
            surface.LayoutTransform = null;

            var size = new Size( 1600, 900 );

            // Attentation: Measure and arrange the surface !
            surface.Measure( size );
            surface.Arrange( new Rect( size ) );

            var renderBitmap = new RenderTargetBitmap( (int)size.Width, (int)size.Height, 96d, 96d, PixelFormats.Pbgra32 );

            var bounds = VisualTreeHelper.GetDescendantBounds( surface );
            var dv = new DrawingVisual();
            using ( var ctx = dv.RenderOpen() )
            {
                var vb = new VisualBrush( surface );
                ctx.DrawRectangle( vb, null, new Rect( new Point(), bounds.Size ) );
            }

            renderBitmap.Render( dv );
            using ( var outStream = new FileStream( file, FileMode.OpenOrCreate, FileAccess.Write ) )
            {
                var encoder = new PngBitmapEncoder();
                encoder.Frames.Add( BitmapFrame.Create( renderBitmap ) );
                encoder.Save( outStream );
            }

            // Restore previously saved layout
            surface.LayoutTransform = transform;
        }

        private void MouseOnMove(object sender, MouseEventArgs e)
        {
            if (e.LeftButton == MouseButtonState.Pressed)
            {
                endPoint = e.GetPosition(canvas);
                Rect targetRect = new Rect(originPoint, endPoint);
                rect.Width = targetRect.Width;
                rect.Height = targetRect.Height;

                //获取装饰元素作为VisualBrush的来源
                VisualBrush vb = new VisualBrush(DecoratedElement);
                vb.Viewbox = targetRect;
                vb.ViewboxUnits = BrushMappingMode.Absolute;

                rect.Fill = vb;

                Canvas.SetTop(rect, targetRect.Top);
                Canvas.SetLeft(rect, targetRect.Left);
                if (canvas.Children.Count==0)
                {
                    canvas.Children.Add(rect);
                }

               Debug.WriteLine(string.Format("endPoint x:{0},y:{1}", endPoint.X, endPoint.Y));
            }
        }

        public static RenderTargetBitmap GetRenderTargetBitmap(this UIElement source, double scale)
        {
            if (source.RenderSize.Height == 0 || source.RenderSize.Width == 0)
                return null;

            double actualHeight = source.RenderSize.Height;
            double actualWidth = source.RenderSize.Width;

            double renderHeight = actualHeight*scale;
            double renderWidth = actualWidth*scale;

            var renderTarget = new RenderTargetBitmap((int) renderWidth, (int) renderHeight, 96, 96,
                                                      PixelFormats.Pbgra32);
            var sourceBrush = new VisualBrush(source);

            var drawingVisual = new DrawingVisual();
            DrawingContext drawingContext = drawingVisual.RenderOpen();

            using (drawingContext)
            {
                drawingContext.PushTransform(new ScaleTransform(scale, scale));
                drawingContext.DrawRectangle(sourceBrush, null,
                                             new Rect(new Point(0, 0), new Point(actualWidth, actualHeight)));
            }
            renderTarget.Render(drawingVisual);
            return renderTarget;
        }