C# Media.GradientStop类代码示例

        /// <summary>Creates a gradient brush with the given colors flowing in the specified direction.</summary>
        /// <param name="direction">The direction of the gradient.</param>
        /// <param name="start">The starting color.</param>
        /// <param name="end">The ending color.</param>
        public static LinearGradientBrush ToGradient(this Direction direction, Color start, Color end)
        {
            // Create the brush.
            var brush = new LinearGradientBrush();
            switch (direction)
            {
                case Direction.Down:
                case Direction.Up:
                    brush.StartPoint = new Point(0.5, 0);
                    brush.EndPoint = new Point(0.5, 1);
                    break;
                case Direction.Right:
                case Direction.Left:
                    brush.StartPoint = new Point(0, 0.5);
                    brush.EndPoint = new Point(1, 0.5);
                    break;
            }

            // Configure colors.
            var gradientStart = new GradientStop { Color = start };
            var gradientEnd = new GradientStop { Color = end };

            gradientStart.Offset = direction == Direction.Up || direction == Direction.Left ? 1 : 0;
            gradientEnd.Offset = direction == Direction.Down || direction == Direction.Right ? 1 : 0;

            // Insert colors.
            brush.GradientStops.Add(gradientStart);
            brush.GradientStops.Add(gradientEnd);

            // Finish up.
            return brush;
            
        }

        public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            var isKeyboardFocusWithin = (bool)value;

            if (isKeyboardFocusWithin)
            {
                LinearGradientBrush linGrBrush = new LinearGradientBrush();

                linGrBrush.StartPoint = new Point(0.5, 0);
                linGrBrush.EndPoint = new Point(0.5, 1);

                GradientStop firstGrStop = new GradientStop();
                firstGrStop.Color = Color.FromArgb(255, 253, 211, 168);
                GradientStop secondGrStop = new GradientStop();
                secondGrStop.Color = Color.FromArgb(255, 252, 231, 159);

                linGrBrush.GradientStops.Add(firstGrStop);
                linGrBrush.GradientStops.Add(secondGrStop);

                return linGrBrush;
            }
            else
            {
                return new SolidColorBrush(Colors.LightGray);
            }
        }

        public static Brush LinearGradientColorBrush(string status)
        {
            LinearGradientBrush tempBrush = new LinearGradientBrush();
            tempBrush.StartPoint = new Point(0, 0);
            tempBrush.EndPoint = new Point(10, 10);
            tempBrush.Opacity = .5;

            tempBrush.MappingMode = BrushMappingMode.Absolute;
            tempBrush.SpreadMethod = GradientSpreadMethod.Repeat;

            GradientStop stop1 = new GradientStop();
            stop1.Color = StatusStringToColorObject(status);
            tempBrush.GradientStops.Add(stop1);

            GradientStop stop2 = new GradientStop();
            stop2.Color = StatusStringToColorObject(status);
            stop2.Offset = 0.49;
            tempBrush.GradientStops.Add(stop2);

            GradientStop stop3 = new GradientStop();
            stop3.Color = Colors.Transparent;
            stop3.Offset = 0.51;
            tempBrush.GradientStops.Add(stop3);

            GradientStop stop4 = new GradientStop();
            stop3.Color = Colors.Transparent;
            stop3.Offset = 1;
            tempBrush.GradientStops.Add(stop4);

            return tempBrush;
        }

        /// <summary>
        /// Retrieves the color that most closely represents what would be found on the scale offset.
        /// </summary>
        /// <param name="ramp">The color scale the return value is derived from.</param>
        /// <param name="offset">The offset on the color scale for which a color is to be found..</param>
        /// <param name="maxR">The maximum R-channel value.</param>
        /// <param name="maxG">The maximum G-channel value.</param>
        /// <param name="maxB">The maximum B-channel value.</param>
        /// <param name="alphaEnabled">Whether or not value-matching for the alpha channel is enabled.</param>
        /// <returns>The color closest to the specified offset on the specified color scale.</returns>
        public static Color MatchOffsetToColor(this GradientStopCollection ramp, double offset, int maxR, int maxG, int maxB, bool alphaEnabled)
        {
            double startBoundaryOffset = 0.0;
            double finishBoundaryOffset = 1.0;

            GradientStop startBoundary = new GradientStop();
            GradientStop finishBoundary = new GradientStop();

            foreach (GradientStop boundary in ramp)
            {
                if (boundary.Offset <= offset && boundary.Offset > startBoundaryOffset)
                {
                    startBoundary = boundary;
                }
                if (boundary.Offset > offset && boundary.Offset <= finishBoundaryOffset)
                {
                    finishBoundary = boundary;
                    break;
                }
            }

            var color = Color.FromScRgb(
                (alphaEnabled) ? CalculateChannelValue(startBoundary, finishBoundary, "ScA", offset, 255) : (float)1.0,
                CalculateChannelValue(startBoundary, finishBoundary, "ScR", offset, maxR),
                CalculateChannelValue(startBoundary, finishBoundary, "ScG", offset, maxG),
                CalculateChannelValue(startBoundary, finishBoundary, "ScB", offset, maxB)
                );

            return color;
        }

        public RSSFeed()
        {
            InitializeComponent();
            schoolInfo = new MySchoolInfo();
            ApplicationBar.Opacity = 0.5;

            Rectangle verticalFillRectangle = new Rectangle();

            verticalFillRectangle.Width = 200;
            verticalFillRectangle.Height = 100;

            //'Create a vertical linear gradient

            LinearGradientBrush myVerticalGradient = new LinearGradientBrush();
            myVerticalGradient.StartPoint = new Point(0.5, 0);
            myVerticalGradient.EndPoint = new Point(0.5, 1);

            GradientStop stop1 = new GradientStop();
            stop1.Color = schoolInfo.Color1.Color;
            stop1.Offset = 0.33;

            GradientStop stop2 = new GradientStop();
            stop2.Color = schoolInfo.Color2.Color;
            stop2.Offset = 0.66;

            myVerticalGradient.GradientStops.Add(stop1);
            myVerticalGradient.GradientStops.Add(stop2);

            listboxRSSFeedItems.Background = myVerticalGradient;
        }

        public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture){
            int valor = (int)value;

            LinearGradientBrush brocha = new LinearGradientBrush();
            GradientStop color1 = new GradientStop();
            GradientStop color2 = new GradientStop();

            brocha.StartPoint.Offset(-0.041,-0.005);
            brocha.EndPoint.Offset(0.782,1.123);

            color1.Offset = 0;
            if(valor == 0){
                color1.Color = Colors.IndianRed;
            }else {
                color1.Color = Colors.LightBlue;
            }
            
            color2.Offset = 0.645;

            brocha.GradientStops.Add(color1);
            brocha.GradientStops.Add(color2);
            
            return brocha;
 
        }

        private void drawPoint(Point p, Canvas testCanvas)
        {
            //create shape
            System.Diagnostics.Debug.WriteLine("Creating shape");
            Shape userShape;

            Shape shape = new Ellipse();
            shape.SetValue(Canvas.LeftProperty, p.X);
            shape.SetValue(Canvas.TopProperty, p.Y);
            //shape.HorizontalAlignment = HorizontalAlignment.Left;
            //shape.VerticalAlignment = VerticalAlignment.Center;
            shape.Width = 4;
            shape.Height = 4;
            shape.Stroke = new SolidColorBrush(Colors.Black);
            shape.StrokeThickness = 3.0;

            GradientBrush gb = new LinearGradientBrush();
            gb.GradientStops = new GradientStopCollection();
            GradientStop g1 = new GradientStop();
            g1.Color = Colors.Red;
            gb.GradientStops.Add(g1);
            g1 = new GradientStop();
            g1.Color = Colors.Blue;
            g1.Offset = 2;
            gb.GradientStops.Add(g1);

            shape.Fill = gb;

            shape.Visibility = System.Windows.Visibility.Visible;
            shape.Opacity = 0.5;

            testCanvas.Children.Add(shape);
        }

        public static LinearGradientBrush GetLineBrush()
        {
            //<LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
            //<GradientStop Color="#FFCCCCCC" Offset="0"/>
            //<GradientStop Color="Black" Offset="1"/>
            //<GradientStop Color="#FFABABAB" Offset="0.457"/>
            //<GradientStop Color="Black" Offset="0.53"/>
            //</LinearGradientBrush>
            LinearGradientBrush brush = new LinearGradientBrush();
            brush.EndPoint = new Point(0.5, 1);
            brush.StartPoint = new Point(0.5, 0);

            GradientStop gs = new GradientStop();
            gs.Color = ConvertColor("#FFCCCCCC");
            gs.Offset = 0;
            brush.GradientStops.Add(gs);

            gs = new GradientStop();
            gs.Color = Colors.Black;
            gs.Offset = 1;
            brush.GradientStops.Add(gs);

            gs = new GradientStop();
            gs.Color = ConvertColor("#FFABABAB");
            gs.Offset = 0.457;
            brush.GradientStops.Add(gs);

            gs = new GradientStop();
            gs.Color = Colors.Black;
            gs.Offset = 0.53;
            brush.GradientStops.Add(gs);

            return brush;
        }

 void System.Windows.Markup.IComponentConnector.Connect(int connectionId, object target) {
     switch (connectionId)
     {
     case 1:
     this.Animirani = ((System.Windows.Media.GradientStop)(target));
     return;
     }
     this._contentLoaded = true;
 }

 public void InitializeComponent() {
     if (_contentLoaded) {
         return;
     }
     _contentLoaded = true;
     System.Windows.Application.LoadComponent(this, new System.Uri("/MQuter-eLabApp;component/View/Components/Activity/IOGateComponent.xaml", System.UriKind.Relative));
     this.Gate = ((System.Windows.Shapes.Ellipse)(this.FindName("Gate")));
     this.GateBrush = ((System.Windows.Media.GradientStop)(this.FindName("GateBrush")));
 }

 public void InitializeComponent() {
     if (_contentLoaded) {
         return;
     }
     _contentLoaded = true;
     System.Windows.Application.LoadComponent(this, new System.Uri("/MQuter-eLabApp;component/View/ParamIOGate.xaml", System.UriKind.Relative));
     this.ParamConnecctor = ((System.Windows.Shapes.Rectangle)(this.FindName("ParamConnecctor")));
     this.GateBrush = ((System.Windows.Media.GradientStop)(this.FindName("GateBrush")));
 }

 public void InitializeComponent() {
     if (_contentLoaded) {
         return;
     }
     _contentLoaded = true;
     System.Windows.Application.LoadComponent(this, new System.Uri("/Tetris7;component/Piece/Block.xaml", System.UriKind.Relative));
     this.rectangle = ((System.Windows.Shapes.Rectangle)(this.FindName("rectangle")));
     this.gradientStop = ((System.Windows.Media.GradientStop)(this.FindName("gradientStop")));
 }

 private void OnButtonClick(object sender, RoutedEventArgs e)
 {
     GradientStop[] gradientStops = new GradientStop[]
     {
         new GradientStop(Colors.DarkGreen, 0),
         new GradientStop(Colors.White, 1)
     };
     this.Resources["myBrush"] = new LinearGradientBrush(
         new GradientStopCollection(gradientStops));
 }

 public void ShowPopUp(UserControl abc, Point x)
 {
     LinearGradientBrush brush = new LinearGradientBrush();
     GradientStop stop = new GradientStop(Colors.Azure, 0.0);
     GradientStop stop2 = new GradientStop(Colors.Black, 1.0);
     brush.GradientStops.Add(stop);
     brush.GradientStops.Add(stop2);
     this.g.Background = brush;
     this.popUp = new Window();
     this.popUp.Title = "Dispositon Render";
     this.popUp.Name = "PopUp";
     this.popUp.AllowsTransparency = true;
     this.popUp.Background = Brushes.Transparent;
     this.popUp.WindowStyle = WindowStyle.None;
     this.popUp.ShowInTaskbar = true;
     //this.popUp.Topmost = true;
     this.popUp.Height = 400.0;
     this.popUp.Width = 230.0;
     
     this.popUp.MouseLeave += new MouseEventHandler(this.popUp_MouseLeave);
     double primaryScreenWidth = SystemParameters.PrimaryScreenWidth;
     double primaryScreenHeight = SystemParameters.PrimaryScreenHeight;
     double num3 = primaryScreenWidth - x.X;
     double num4 = primaryScreenHeight - x.Y;
     if (num3 < this.popUp.Width)
     {
         this.popUp.Left = primaryScreenWidth - this.popUp.Width;
     }
     else
     {
         this.popUp.Left = x.X - 80.0;
         if (this.popUp.Left < 0.0)
         {
             this.popUp.Left = 0.0;
         }
     }
     if (num4 < this.popUp.Height)
     {
         this.popUp.Top = primaryScreenHeight - this.popUp.Height;
     }
     else
     {
         this.popUp.Top = x.Y - 30.0;
         if (this.popUp.Top < 0.0)
         {
             this.popUp.Top = 0.0;
         }
     }           
     
     this.g.Children.Add(abc);
    
     this.popUp.Content = this.g;
     this.popUp.Show();
 }

        //==========================================================================
        public GradientStop ToGradientStop()
        {
            Color color = Color.ToColor();
              color.A = (byte)Math.Round(Opacity.ToDouble() * 255);

              GradientStop stop = new GradientStop();
              stop.Color = color;
              stop.Offset = Offset.ToDouble();

              return stop;
        }