Comment : définir un stylet

Mise à jour : novembre 2007

Cet exemple montre comment utiliser un Pen pour esquisser une forme. Pour créer un Pen simple, vous devez uniquement spécifier son Thickness et son Brush. Vous pouvez créer un stylet plus complexe en spécifiant des objets DashStyle, DashCap, LineJoin, StartLineCap et EndLineCap.

Exemple

L'exemple suivant utilise un Pen pour esquisser une forme définie par un GeometryDrawing.

using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;
namespace SDKSample
{
    public partial class PenExample : Page
    {
        public PenExample()
        {
            // Create several geometries.
            RectangleGeometry myRectangleGeometry = new RectangleGeometry();
            myRectangleGeometry.Rect = new Rect(0, 0, 50, 50);
            EllipseGeometry myEllipseGeometry = new EllipseGeometry();
            myEllipseGeometry.Center = new Point(75, 75);
            myEllipseGeometry.RadiusX = 50;
            myEllipseGeometry.RadiusY = 50;
            LineGeometry myLineGeometry = new LineGeometry();
            myLineGeometry.StartPoint = new Point(75, 75);
            myLineGeometry.EndPoint = new Point(75, 0);

            // Create a GeometryGroup and add the geometries to it.
            GeometryGroup myGeometryGroup = new GeometryGroup();
            myGeometryGroup.Children.Add(myRectangleGeometry);
            myGeometryGroup.Children.Add(myEllipseGeometry);
            myGeometryGroup.Children.Add(myLineGeometry);

            // Create a GeometryDrawing and use the GeometryGroup to specify
            // its geometry.
            GeometryDrawing myGeometryDrawing = new GeometryDrawing();
            myGeometryDrawing.Geometry = myGeometryGroup;

            // Add the GeometryDrawing to a DrawingGroup.
            DrawingGroup myDrawingGroup = new DrawingGroup();
            myDrawingGroup.Children.Add(myGeometryDrawing);

            // Create a Pen to add to the GeometryDrawing created above.
            Pen myPen = new Pen();
            myPen.Thickness = 10;
            myPen.LineJoin = PenLineJoin.Round;
            myPen.EndLineCap = PenLineCap.Round;

            // Create a gradient to use as a value for the Pen's Brush property.
            GradientStop firstStop = new GradientStop();
            firstStop.Offset = 0.0;
            Color c1 = new Color();
            c1.A = 255;
            c1.R = 204;
            c1.G = 204;
            c1.B = 255;
            firstStop.Color = c1;
            GradientStop secondStop = new GradientStop();
            secondStop.Offset = 1.0;
            secondStop.Color = Colors.Purple;

            LinearGradientBrush myLinearGradientBrush = new LinearGradientBrush();
            myLinearGradientBrush.GradientStops.Add(firstStop);
            myLinearGradientBrush.GradientStops.Add(secondStop);

            myPen.Brush = myLinearGradientBrush;
            myGeometryDrawing.Pen = myPen;

            // Create an Image and set its DrawingImage to the Geometry created above.
            Image myImage = new Image();
            myImage.Stretch = Stretch.None;
            myImage.Margin = new Thickness(10);

            DrawingImage myDrawingImage = new DrawingImage();
            myDrawingImage.Drawing = myDrawingGroup;
            myImage.Source = myDrawingImage;

            this.Content = myImage;

        }      
    }
}

<Page 
  xmlns="https://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="https://schemas.microsoft.com/winfx/2006/xaml"
  Background="White">

  <Image Stretch="None" Margin="20">
    <Image.Source>
      <DrawingImage>
        <DrawingImage.Drawing>
          <DrawingGroup>
            <GeometryDrawing>
              <GeometryDrawing.Geometry>
                <GeometryGroup>
                  <RectangleGeometry Rect="0,0,50,50" />
                  <EllipseGeometry Center="75,75" RadiusX="50" RadiusY="50" />
                  <LineGeometry StartPoint="75,75" EndPoint="75,0" />
                </GeometryGroup>
              </GeometryDrawing.Geometry>
              <GeometryDrawing.Pen>
                <Pen 
                  Thickness="10" 
                  LineJoin="Round" 
                  EndLineCap="Triangle"
                  StartLineCap="Round">
                  <Pen.Brush>
                    <LinearGradientBrush>
                      <GradientStop Offset="0.0" Color="#CCCCFF" />
                      <GradientStop Offset="1.0" Color="Purple" />
                    </LinearGradientBrush>
                  </Pen.Brush>
                </Pen>
              </GeometryDrawing.Pen>
            </GeometryDrawing>
          </DrawingGroup>
        </DrawingImage.Drawing>
      </DrawingImage>
    </Image.Source>
  </Image>






</Page>

GeometryDrawing