Use a VisualBrush to magnify a portion of the screen. : Brush « Windows Presentation Foundation « C# / CSharp Tutorial

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C# / CSharp Tutorial » Windows Presentation Foundation » Brush 
24.81.7.Use a VisualBrush to magnify a portion of the screen.
<Page xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
  x:Class="Microsoft.Samples.Graphics.UsingVisualBrush.MagnifyingGlassExample"
  Background="White">
  <Page.Resources>
    <Style TargetType="{x:Type Paragraph}">
      <Setter Property="Margin" Value="10" />
    </Style>
    <DrawingBrush x:Key="MyGridBackgroundBrushResource"
      Viewport="0,0,10,10" ViewportUnits="Absolute" TileMode="Tile">
      <DrawingBrush.Drawing>
        <DrawingGroup>
          <DrawingGroup.Children>
            <GeometryDrawing Brush="White">
              <GeometryDrawing.Geometry>
                <RectangleGeometry Rect="0,0,1,1" />
              </GeometryDrawing.Geometry>
            </GeometryDrawing>
            <GeometryDrawing Brush="#E6E8F6"
              Geometry="M 0,0 L 0,1 0.1,1 0.1,0.1 1,0.1 1,0 Z" />                      
          </DrawingGroup.Children>
        </DrawingGroup>
      </DrawingBrush.Drawing>
    </DrawingBrush>   
    
  </Page.Resources>

  <Grid>  
    <ScrollViewer>
      <StackPanel Name="magnifiedPanel" 
        VerticalAlignment="Stretch"
        MouseMove="updateMagnifyingGlass" 
        Background="{StaticResource MyGridBackgroundBrushResource}">
        
        <FlowDocumentScrollViewer>
        <FlowDocument>
<Paragraph><Button></Button></Paragraph>

<Paragraph><Border BorderBrush="Black" BorderThickness="1"><Image Source="c:\image.jpg" Stretch="None" /></Border></Paragraph>

<Paragraph>this is a test</Paragraph> 
        </FlowDocument>
        </FlowDocumentScrollViewer>
      </StackPanel>
    </ScrollViewer>
    <Canvas Name="magnifyingGlassCanvas">
      <Ellipse Name="magnifyingGlassEllipse" Width="100" Height="100" Stroke="Black">
        <Ellipse.Fill>
          <DrawingBrush>
            <DrawingBrush.Drawing>
              <DrawingGroup>
                <DrawingGroup.Children>
                   <GeometryDrawing Brush="White">
                    <GeometryDrawing.Geometry>
                      <RectangleGeometry Rect="0,0,1,1" />
                    </GeometryDrawing.Geometry>
                  </GeometryDrawing>
                   <GeometryDrawing>
                    <GeometryDrawing.Brush>
                       <VisualBrush x:Name="myVisualBrush" ViewboxUnits="Absolute"
                        Visual="{Binding ElementName=magnifiedPanel}"/>
                    </GeometryDrawing.Brush>
                    <GeometryDrawing.Geometry>
                      <RectangleGeometry Rect="0,0,1,1" />
                    </GeometryDrawing.Geometry>
                  </GeometryDrawing>
                </DrawingGroup.Children>
              </DrawingGroup>
            </DrawingBrush.Drawing>
          </DrawingBrush>
        </Ellipse.Fill>
      </Ellipse>
    </Canvas>
  </Grid>
</Page>

//File:Window.xaml.cs
using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Navigation;
using System.Windows.Shapes;
using System.Windows.Media;
using System.Windows.Input;

namespace Microsoft.Samples.Graphics.UsingVisualBrush
{
    public partial class MagnifyingGlassExample : Page
    {
        private static readonly double distanceFromMouse = 5;
        
        public MagnifyingGlassExample()
        {
        }
        private void updateMagnifyingGlass(object sender, MouseEventArgs args)
        {
            Mouse.SetCursor(Cursors.Cross);
            Point currentMousePosition = args.GetPosition(this);
            if (this.ActualWidth - currentMousePosition.X > magnifyingGlassEllipse.Width + distanceFromMouse)
            {
                Canvas.SetLeft(magnifyingGlassEllipse, currentMousePosition.X + distanceFromMouse);
            }
            else
            {
                Canvas.SetLeft(magnifyingGlassEllipse, currentMousePosition.X - distanceFromMouse - magnifyingGlassEllipse.Width);
            }
            
            if (this.ActualHeight - currentMousePosition.Y > magnifyingGlassEllipse.Height + distanceFromMouse)
            {
                Canvas.SetTop(magnifyingGlassEllipse, currentMousePosition.Y + distanceFromMouse);
            }
            else
            {
                Canvas.SetTop(magnifyingGlassEllipse, currentMousePosition.Y - distanceFromMouse - magnifyingGlassEllipse.Height);
            }
            myVisualBrush.Viewbox = new Rect(currentMousePosition.X - 10, currentMousePosition.Y  - 102020);
        }
    }
}
WPF Use A Visual Brush To Magnify A Portion Of The Screen
24.81.Brush
24.81.1.Set color for SolidColorBrushSet color for SolidColorBrush
24.81.2.Paint with system brushes and colors.Paint with system brushes and colors.
24.81.3.Uses a predefined SolidColorBrush, defined by the System.Windows.Media.Brushes classUses a predefined SolidColorBrush, defined by the System.Windows.Media.Brushes class
24.81.4.Gradient brushes within a DrawingBrush. Two overlapping gradients are layeredGradient brushes within a DrawingBrush. Two overlapping gradients are layered
24.81.5.OpacityMask, LinearGradientBrush, RenderTransformOpacityMask, LinearGradientBrush, RenderTransform
24.81.6.Brush resourceBrush resource
24.81.7.Use a VisualBrush to magnify a portion of the screen.Use a VisualBrush to magnify a portion of the screen.
24.81.8.Predefined brush in Brushes ClassPredefined brush in Brushes Class
24.81.9.Solid Color Brush In Code with predefined brushSolid Color Brush In Code with predefined brush
24.81.10.Solid Color Brush In Code with SolidColorBrushSolid Color Brush In Code with SolidColorBrush
24.81.11.Solid Color Brush In Code with SolidColorBrush and RGB colorSolid Color Brush In Code with SolidColorBrush and RGB color
24.81.12.Get all public static properties from Brush
24.81.13.Change the Window background with a Brush
24.81.14.Using Brushes.AliceBlue
24.81.15.Color map Brush
24.81.16.Create Vector from width and height
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