Procedura: creare un disegno composto

In questo esempio viene illustrato come utilizzare un DrawingGroup oggetto per creare disegni complessi combinando più Drawing oggetti in un singolo disegno composito.

Esempio

Nell'esempio seguente viene utilizzato un DrawingGroup oggetto per creare un disegno composito dagli GeometryDrawing oggetti e ImageDrawing . L'immagine seguente illustra l'output generato dall'esempio.

Disegno composito creato utilizzando DrawingGroup

Si noti il bordo grigio, che mostra i limiti del disegno.

//
// Create three drawings.
//
GeometryDrawing ellipseDrawing =
    new GeometryDrawing(
        new SolidColorBrush(Color.FromArgb(102, 181, 243, 20)),
        new Pen(Brushes.Black, 4),
        new EllipseGeometry(new Point(50,50), 50, 50)
    );

ImageDrawing kiwiPictureDrawing =
    new ImageDrawing(
        new BitmapImage(new Uri(@"sampleImages\kiwi.png", UriKind.Relative)),
        new Rect(50,50,100,100));

GeometryDrawing ellipseDrawing2 =
    new GeometryDrawing(
        new SolidColorBrush(Color.FromArgb(102,181,243,20)),
        new Pen(Brushes.Black, 4),
        new EllipseGeometry(new Point(150, 150), 50, 50)
    );

// Create a DrawingGroup to contain the drawings.
DrawingGroup aDrawingGroup = new DrawingGroup();
aDrawingGroup.Children.Add(ellipseDrawing);
aDrawingGroup.Children.Add(kiwiPictureDrawing);
aDrawingGroup.Children.Add(ellipseDrawing2);

<DrawingGroup>

  <GeometryDrawing Brush="#66B5F314">
    <GeometryDrawing.Geometry>
      <EllipseGeometry Center="50,50" RadiusX="50"  RadiusY="50"/>
    </GeometryDrawing.Geometry>
    <GeometryDrawing.Pen>
      <Pen Brush="Black" Thickness="4" />
    </GeometryDrawing.Pen>
  </GeometryDrawing>
  <ImageDrawing ImageSource="sampleImages\kiwi.png" Rect="50,50,100,100"/>
  <GeometryDrawing Brush="#66B5F314">
    <GeometryDrawing.Geometry>
      <EllipseGeometry Center="150,150" RadiusX="50"  RadiusY="50"/>
    </GeometryDrawing.Geometry>
    <GeometryDrawing.Pen>
      <Pen Brush="Black" Thickness="4" />
    </GeometryDrawing.Pen>
  </GeometryDrawing>
</DrawingGroup>

È possibile utilizzare un DrawingGroup oggetto per applicare un'impostazione Transform, OpacityOpacityMask, BitmapEffect, ClipGeometry, o GuidelineSet ai disegni contenuti. DrawingGroup Poiché è anche un Drawingoggetto , può contenere altri DrawingGroup oggetti.

L'esempio seguente è simile all'esempio precedente, ad eccezione del fatto che usa oggetti aggiuntivi DrawingGroup per applicare effetti bitmap e una maschera di opacità ad alcuni dei disegni. L'immagine seguente illustra l'output generato dall'esempio.

Disegno composito con più oggetti DrawingGroup

Si noti il bordo grigio, che mostra i limiti del disegno.

// Create a DrawingGroup.
DrawingGroup mainGroup = new DrawingGroup();

//
// Create a GeometryDrawing
//
GeometryDrawing ellipseDrawing =
    new GeometryDrawing(
        new SolidColorBrush(Color.FromArgb(102, 181, 243, 20)),
        new Pen(Brushes.Black, 4),
        new EllipseGeometry(new Point(50, 50), 50, 50)
    );

//
// Use a DrawingGroup to apply a blur
// bitmap effect to the drawing.
//
DrawingGroup blurGroup = new DrawingGroup();
blurGroup.Children.Add(ellipseDrawing);
BlurBitmapEffect blurEffect = new BlurBitmapEffect();
blurEffect.Radius = 5;
blurGroup.BitmapEffect = blurEffect;

// Add the DrawingGroup to the main DrawingGroup.
mainGroup.Children.Add(blurGroup);

//
// Create an ImageDrawing.
//
ImageDrawing kiwiPictureDrawing =
    new ImageDrawing(
        new BitmapImage(new Uri(@"sampleImages\kiwi.png", UriKind.Relative)),
        new Rect(50, 50, 100, 100));

//
// Use a DrawingGroup to apply an opacity mask
// and a bevel.
//
DrawingGroup maskedAndBeveledGroup = new DrawingGroup();
maskedAndBeveledGroup.Children.Add(kiwiPictureDrawing);

// Create an opacity mask.
RadialGradientBrush rgBrush =new RadialGradientBrush();
rgBrush.GradientStops.Add(new GradientStop(Color.FromArgb(0,0,0,0), 0.55));
rgBrush.GradientStops.Add(new GradientStop(Color.FromArgb(255,0,0,0), 0.65));
rgBrush.GradientStops.Add(new GradientStop(Color.FromArgb(0,0,0,0), 0.75));
rgBrush.GradientStops.Add(new GradientStop(Color.FromArgb(255,0,0,0), 0.80));
rgBrush.GradientStops.Add(new GradientStop(Color.FromArgb(0,0,0,0), 0.90));
rgBrush.GradientStops.Add(new GradientStop(Color.FromArgb(255,0,0,0), 1.0));
maskedAndBeveledGroup.OpacityMask = rgBrush;

// Apply a bevel.
maskedAndBeveledGroup.BitmapEffect = new BevelBitmapEffect();

// Add the DrawingGroup to the main group.
mainGroup.Children.Add(maskedAndBeveledGroup);

//
// Create another GeometryDrawing.
//
GeometryDrawing ellipseDrawing2 =
  new GeometryDrawing(
      new SolidColorBrush(Color.FromArgb(102, 181, 243, 20)),
      new Pen(Brushes.Black, 4),
      new EllipseGeometry(new Point(150, 150), 50, 50)
  );

// Add the DrawingGroup to the main group.
mainGroup.Children.Add(ellipseDrawing2);

<DrawingGroup>

  <DrawingGroup>
    <GeometryDrawing Brush="#66B5F314">
      <GeometryDrawing.Geometry>
        <EllipseGeometry Center="50,50" RadiusX="50"  RadiusY="50"/>
      </GeometryDrawing.Geometry>
      <GeometryDrawing.Pen>
        <Pen Brush="Black" Thickness="4" />
      </GeometryDrawing.Pen>
    </GeometryDrawing>
    <DrawingGroup.BitmapEffect>
      <BlurBitmapEffect Radius="5" />
    </DrawingGroup.BitmapEffect>
  </DrawingGroup>

  <DrawingGroup>
    <ImageDrawing ImageSource="sampleImages\kiwi.png" Rect="50,50,100,100"/>
    <DrawingGroup.BitmapEffect>
      <BevelBitmapEffect  />
    </DrawingGroup.BitmapEffect>
    <DrawingGroup.OpacityMask>
      <RadialGradientBrush>
        <GradientStop Offset="0.55" Color="#00000000" />
        <GradientStop Offset="0.65" Color="#FF000000" />
        <GradientStop Offset="0.75" Color="#00000000" />
        <GradientStop Offset="0.80" Color="#FF000000" />
        <GradientStop Offset="0.90" Color="#00000000" />
        <GradientStop Offset="1.0" Color="#FF000000" />
      </RadialGradientBrush>
    </DrawingGroup.OpacityMask>
  </DrawingGroup>

  <GeometryDrawing Brush="#66B5F314">
    <GeometryDrawing.Geometry>
      <EllipseGeometry Center="150,150" RadiusX="50"  RadiusY="50"/>
    </GeometryDrawing.Geometry>
    <GeometryDrawing.Pen>
      <Pen Brush="Black" Thickness="4" />
    </GeometryDrawing.Pen>
  </GeometryDrawing>

</DrawingGroup>

Per altre informazioni sugli oggetti, vedere Cenni preliminari sugli Drawing oggetti disegno.

Vedi anche

• BitmapEffect
• Transform
• OpacityMask
• Opacity
• ClipGeometry
• GuidelineSet
• Cenni preliminari sugli oggetti Drawing