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Cómo: Usar un dibujo como el origen de una imagen

  • Artículo

En este ejemplo se muestra cómo usar como un Drawing como el Source para un control Image. Para mostrar un Drawing con un control Image, use DrawingImage como el Source del control Image y establezca la propiedad DrawingImage.Drawing del objeto DrawingImage en el dibujo que desea mostrar.

Ejemplo

En el ejemplo siguiente se usan un DrawingImage y un control Image para mostrar un GeometryDrawing. Este ejemplo produce el siguiente resultado:

A GeometryDrawing of two ellipsesObjeto GeometryDrawing de dos elipsesgraphicsmm_geodraw
DrawingImage

using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;

namespace SDKSample
{
    public class DrawingImageExample : Page
    {

        public DrawingImageExample()
        {

            //
            // Create the Geometry to draw.
            //
            GeometryGroup ellipses = new GeometryGroup();
            ellipses.Children.Add(
                new EllipseGeometry(new Point(50,50), 45, 20)
                );
            ellipses.Children.Add(
                new EllipseGeometry(new Point(50, 50), 20, 45)
                );

            //
            // Create a GeometryDrawing.
            //
            GeometryDrawing aGeometryDrawing = new GeometryDrawing();
            aGeometryDrawing.Geometry = ellipses;

            // Paint the drawing with a gradient.
            aGeometryDrawing.Brush =
                new LinearGradientBrush(
                    Colors.Blue,
                    Color.FromRgb(204,204,255),
                    new Point(0,0),
                    new Point(1,1));

            // Outline the drawing with a solid color.
            aGeometryDrawing.Pen = new Pen(Brushes.Black, 10);

            //
            // Use a DrawingImage and an Image control
            // to display the drawing.
            //
            DrawingImage geometryImage = new DrawingImage(aGeometryDrawing);

            // Freeze the DrawingImage for performance benefits.
            geometryImage.Freeze();

            Image anImage = new Image();
            anImage.Source = geometryImage;
            anImage.HorizontalAlignment = HorizontalAlignment.Left;

            //
            // Place the image inside a border and
            // add it to the page.
            //
            Border exampleBorder = new Border();
            exampleBorder.Child = anImage;
            exampleBorder.BorderBrush = Brushes.Gray;
            exampleBorder.BorderThickness = new Thickness(1);
            exampleBorder.HorizontalAlignment = HorizontalAlignment.Left;
            exampleBorder.VerticalAlignment = VerticalAlignment.Top;
            exampleBorder.Margin = new Thickness(10);

            this.Margin = new Thickness(20);
            this.Background = Brushes.White;
            this.Content = exampleBorder;
        }
    }
}

<Page 
  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
  xmlns:PresentationOptions="http://schemas.microsoft.com/winfx/2006/xaml/presentation/options" 
  xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
  mc:Ignorable="PresentationOptions"
  Background="White" Margin="20">

  <Border BorderBrush="Gray" BorderThickness="1" 
    HorizontalAlignment="Left" VerticalAlignment="Top"
    Margin="10">

    <!-- This image uses a Drawing object for its source. -->
    <Image>
      <Image.Source>
        <DrawingImage PresentationOptions:Freeze="True">
          <DrawingImage.Drawing>
            <GeometryDrawing>
              <GeometryDrawing.Geometry>
                <GeometryGroup>
                  <EllipseGeometry Center="50,50" RadiusX="45" RadiusY="20" />
                  <EllipseGeometry Center="50,50" RadiusX="20" RadiusY="45" />
                </GeometryGroup>
              </GeometryDrawing.Geometry>
              <GeometryDrawing.Brush>
                <LinearGradientBrush>
                  <GradientStop Offset="0.0" Color="Blue" />
                  <GradientStop Offset="1.0" Color="#CCCCFF" />
                </LinearGradientBrush>
              </GeometryDrawing.Brush>
              <GeometryDrawing.Pen>
                <Pen Thickness="10" Brush="Black" />
              </GeometryDrawing.Pen>
            </GeometryDrawing>
          </DrawingImage.Drawing>
        </DrawingImage>
      </Image.Source>
    </Image>
  </Border>

</Page>

Vea también