如何：设置 TileBrush 的水平对齐方式和垂直对齐方式
本示例演示如何控制平铺内容的水平对齐方式和垂直对齐方式。 若要控制 TileBrush 的水平和垂直对齐方式，请使用其 AlignmentX 和 AlignmentY 属性。
当满足以下任一条件时，将使用 TileBrush 的 AlignmentX 和 AlignmentY 属性：
Stretch 属性为 Uniform 或 UniformToFill，且 Viewbox 和 Viewport 具有不同的纵横比。
将 TileBrush 与左上角对齐
下面的示例将 DrawingBrush 的内容（一种 TileBrush）与其磁贴的左上角对齐。 为了对齐内容，该示例将 DrawingBrush 的 AlignmentX 属性设置为 Left，将 AlignmentY 属性设置为 Top。 本示例生成以下输出。
内容与左上角对齐的 TileBrush
//
// Create a TileBrush and align its
// content to the top-left of its tile.
//
DrawingBrush topLeftAlignedTileBrush = new DrawingBrush();
topLeftAlignedTileBrush.AlignmentX = AlignmentX.Left;
topLeftAlignedTileBrush.AlignmentY = AlignmentY.Top;
// Set Stretch to None so that the brush's
// content doesn't automatically expand to
// fill the entire tile.
topLeftAlignedTileBrush.Stretch = Stretch.None;
// Define the brush's content.
GeometryGroup ellipses = new GeometryGroup();
ellipses.Children.Add(new EllipseGeometry(new Point(50, 50), 20, 45));
ellipses.Children.Add(new EllipseGeometry(new Point(50, 50), 45, 20));
Pen drawingPen = new Pen(Brushes.Gray, 10);
GeometryDrawing ellipseDrawing = new GeometryDrawing(Brushes.Blue, drawingPen, ellipses);
topLeftAlignedTileBrush.Drawing = ellipseDrawing;
// Use the brush to paint a rectangle.
Rectangle rectangle1 = new Rectangle();
rectangle1.Width = 150;
rectangle1.Height = 150;
rectangle1.Stroke = Brushes.Red;
rectangle1.StrokeThickness = 2;
rectangle1.Margin = new Thickness(20);
rectangle1.Fill = topLeftAlignedTileBrush;
'
' Create a TileBrush and align its
' content to the top-left of its tile.
'
Dim topLeftAlignedTileBrush As New DrawingBrush()
topLeftAlignedTileBrush.AlignmentX = AlignmentX.Left
topLeftAlignedTileBrush.AlignmentY = AlignmentY.Top
' Set Stretch to None so that the brush's
' content doesn't automatically expand to
' fill the entire tile.
topLeftAlignedTileBrush.Stretch = Stretch.None
' Define the brush's content.
Dim ellipses As New GeometryGroup()
ellipses.Children.Add(New EllipseGeometry(New Point(50, 50), 20, 45))
ellipses.Children.Add(New EllipseGeometry(New Point(50, 50), 45, 20))
Dim drawingPen As New Pen(Brushes.Gray, 10)
Dim ellipseDrawing As New GeometryDrawing(Brushes.Blue, drawingPen, ellipses)
topLeftAlignedTileBrush.Drawing = ellipseDrawing
' Use the brush to paint a rectangle.
Dim rectangle1 As New Rectangle()
With rectangle1
.Width = 150
.Height = 150
.Stroke = Brushes.Red
.StrokeThickness = 2
.Margin = New Thickness(20)
.Fill = topLeftAlignedTileBrush
End With
<Rectangle
Width="150" Height="150"
Stroke="Red" StrokeThickness="2"
Margin="20">
<Rectangle.Fill>
<!-- This brush's content is aligned to the top-left
of its tile. -->
<DrawingBrush
Stretch="None"
AlignmentX="Left"
AlignmentY="Top">
<DrawingBrush.Drawing>
<GeometryDrawing Brush="MediumBlue">
<GeometryDrawing.Geometry>
<GeometryGroup>
<EllipseGeometry RadiusX="20" RadiusY="45" Center="50,50" />
<EllipseGeometry RadiusX="45" RadiusY="20" Center="50,50" />
</GeometryGroup>
</GeometryDrawing.Geometry>
<GeometryDrawing.Pen>
<Pen Brush="Gray" Thickness="10" />
</GeometryDrawing.Pen>
</GeometryDrawing>
</DrawingBrush.Drawing>
</DrawingBrush>
</Rectangle.Fill>
</Rectangle>
将 DrawingBrush 与右下角对齐
下一个示例通过将 AlignmentX 属性设置为 Right 并将 AlignmentY 属性设置为 Bottom，将 DrawingBrush 的内容与其磁贴的右下角对齐。 该示例生成以下输出。
内容与右下角对齐的 TileBrush
//
// Create a TileBrush and align its
// content to the bottom-right of its tile.
//
DrawingBrush bottomRightAlignedTileBrush = new DrawingBrush();
bottomRightAlignedTileBrush.AlignmentX = AlignmentX.Right;
bottomRightAlignedTileBrush.AlignmentY = AlignmentY.Bottom;
bottomRightAlignedTileBrush.Stretch = Stretch.None;
// Define the brush's content.
bottomRightAlignedTileBrush.Drawing = ellipseDrawing;
// Use the brush to paint a rectangle.
Rectangle rectangle2 = new Rectangle();
rectangle2.Width = 150;
rectangle2.Height = 150;
rectangle2.Stroke = Brushes.Red;
rectangle2.StrokeThickness = 2;
rectangle2.Margin = new Thickness(20);
rectangle2.Fill = bottomRightAlignedTileBrush;
'
' Create a TileBrush and align its
' content to the bottom-right of its tile.
'
Dim bottomRightAlignedTileBrush As New DrawingBrush()
With bottomRightAlignedTileBrush
.AlignmentX = AlignmentX.Right
.AlignmentY = AlignmentY.Bottom
.Stretch = Stretch.None
' Define the brush's content.
.Drawing = ellipseDrawing
End With
' Use the brush to paint a rectangle.
Dim rectangle2 As New Rectangle()
With rectangle2
.Width = 150
.Height = 150
.Stroke = Brushes.Red
.StrokeThickness = 2
.Margin = New Thickness(20)
.Fill = bottomRightAlignedTileBrush
End With
<Rectangle
Width="150" Height="150"
Stroke="Red" StrokeThickness="2"
Margin="20">
<Rectangle.Fill>
<!-- This brush's content is aligned to the bottom right
of its tile. -->
<DrawingBrush
Stretch="None"
AlignmentX="Right"
AlignmentY="Bottom">
<DrawingBrush.Drawing>
<GeometryDrawing Brush="MediumBlue">
<GeometryDrawing.Geometry>
<GeometryGroup>
<EllipseGeometry RadiusX="20" RadiusY="45" Center="50,50" />
<EllipseGeometry RadiusX="45" RadiusY="20" Center="50,50" />
</GeometryGroup>
</GeometryDrawing.Geometry>
<GeometryDrawing.Pen>
<Pen Brush="Gray" Thickness="10" />
</GeometryDrawing.Pen>
</GeometryDrawing>
</DrawingBrush.Drawing>
</DrawingBrush>
</Rectangle.Fill>
</Rectangle>
将 DrawingBrush 与左上角对齐
下一个示例通过将 AlignmentX 属性设置为 Left 并将 AlignmentY 属性设置为 Top，将 DrawingBrush 的内容与其磁贴的左上角对齐。 它还设置 DrawingBrush 的 Viewport 和 TileMode 以生成磁贴模式。 该示例生成以下输出。
内容与基本平铺图案的左上角对齐的平铺图案
上图突出显示了基本平铺图案，以便显示其内容的对齐方式。 请注意，AlignmentX 设置不起作用，因为 DrawingBrush 的内容完全水平填充基本磁贴。
//
// Create a TileBrush that generates a
// tiled pattern and align its
// content to the top-left of its tile.
//
DrawingBrush tiledTopLeftAlignedTileBrush = new DrawingBrush();
tiledTopLeftAlignedTileBrush.AlignmentX = AlignmentX.Left;
tiledTopLeftAlignedTileBrush.AlignmentY = AlignmentY.Top;
tiledTopLeftAlignedTileBrush.Stretch = Stretch.Uniform;
// Set the brush's Viewport and TileMode to produce a
// tiled pattern.
tiledTopLeftAlignedTileBrush.Viewport = new Rect(0, 0, 0.25, 0.5);
tiledTopLeftAlignedTileBrush.TileMode = TileMode.Tile;
// Define the brush's content.
tiledTopLeftAlignedTileBrush.Drawing = ellipseDrawing;
// Use the brush to paint a rectangle.
Rectangle rectangle3 = new Rectangle();
rectangle3.Width = 150;
rectangle3.Height = 150;
rectangle3.Stroke = Brushes.Black;
rectangle3.StrokeThickness = 2;
rectangle3.Margin = new Thickness(20);
rectangle3.Fill = tiledTopLeftAlignedTileBrush;
'
' Create a TileBrush that generates a
' tiled pattern and align its
' content to the top-left of its tile.
'
Dim tiledTopLeftAlignedTileBrush As New DrawingBrush()
With tiledTopLeftAlignedTileBrush
.AlignmentX = AlignmentX.Left
.AlignmentY = AlignmentY.Top
.Stretch = Stretch.Uniform
' Set the brush's Viewport and TileMode to produce a
' tiled pattern.
.Viewport = New Rect(0, 0, 0.25, 0.5)
.TileMode = TileMode.Tile
' Define the brush's content.
.Drawing = ellipseDrawing
End With
' Use the brush to paint a rectangle.
Dim rectangle3 As New Rectangle()
With rectangle3
.Width = 150
.Height = 150
.Stroke = Brushes.Black
.StrokeThickness = 2
.Margin = New Thickness(20)
.Fill = tiledTopLeftAlignedTileBrush
End With
<Rectangle
Width="150" Height="150"
Stroke="Black" StrokeThickness="2"
Margin="20">
<Rectangle.Fill>
<!-- This brush's content is aligned to the top left
of its tile. -->
<DrawingBrush
Stretch="Uniform"
Viewport="0,0,0.25,0.5"
TileMode="Tile"
AlignmentX="Left"
AlignmentY="Top">
<DrawingBrush.Drawing>
<GeometryDrawing Brush="MediumBlue">
<GeometryDrawing.Geometry>
<GeometryGroup>
<EllipseGeometry RadiusX="20" RadiusY="45" Center="50,50" />
<EllipseGeometry RadiusX="45" RadiusY="20" Center="50,50" />
</GeometryGroup>
</GeometryDrawing.Geometry>
<GeometryDrawing.Pen>
<Pen Brush="Gray" Thickness="10" />
</GeometryDrawing.Pen>
</GeometryDrawing>
</DrawingBrush.Drawing>
</DrawingBrush>
</Rectangle.Fill>
</Rectangle>
将平铺的 DrawingBrush 与右下角对齐
最后一个示例通过将 AlignmentX 属性设置为 Right 并将 AlignmentY 属性设置为 Bottom，将平铺的 DrawingBrush 的内容与其基本磁贴的右下角对齐。 该示例生成以下输出。
内容与基本平铺图案的右下角对齐的平铺图案
同样，AlignmentX 设置不起作用，因为 DrawingBrush 的内容完全水平填充基本磁贴。
//
// Create a TileBrush and align its
// content to the bottom-right of its tile.
//
DrawingBrush bottomRightAlignedTileBrush = new DrawingBrush();
bottomRightAlignedTileBrush.AlignmentX = AlignmentX.Right;
bottomRightAlignedTileBrush.AlignmentY = AlignmentY.Bottom;
bottomRightAlignedTileBrush.Stretch = Stretch.None;
// Define the brush's content.
bottomRightAlignedTileBrush.Drawing = ellipseDrawing;
// Use the brush to paint a rectangle.
Rectangle rectangle2 = new Rectangle();
rectangle2.Width = 150;
rectangle2.Height = 150;
rectangle2.Stroke = Brushes.Red;
rectangle2.StrokeThickness = 2;
rectangle2.Margin = new Thickness(20);
rectangle2.Fill = bottomRightAlignedTileBrush;
'
' Create a TileBrush and align its
' content to the bottom-right of its tile.
'
Dim bottomRightAlignedTileBrush As New DrawingBrush()
With bottomRightAlignedTileBrush
.AlignmentX = AlignmentX.Right
.AlignmentY = AlignmentY.Bottom
.Stretch = Stretch.None
' Define the brush's content.
.Drawing = ellipseDrawing
End With
' Use the brush to paint a rectangle.
Dim rectangle2 As New Rectangle()
With rectangle2
.Width = 150
.Height = 150
.Stroke = Brushes.Red
.StrokeThickness = 2
.Margin = New Thickness(20)
.Fill = bottomRightAlignedTileBrush
End With
<Rectangle
Width="150" Height="150"
Stroke="Red" StrokeThickness="2"
Margin="20">
<Rectangle.Fill>
<!-- This brush's content is aligned to the bottom right
of its tile. -->
<DrawingBrush
Stretch="None"
AlignmentX="Right"
AlignmentY="Bottom">
<DrawingBrush.Drawing>
<GeometryDrawing Brush="MediumBlue">
<GeometryDrawing.Geometry>
<GeometryGroup>
<EllipseGeometry RadiusX="20" RadiusY="45" Center="50,50" />
<EllipseGeometry RadiusX="45" RadiusY="20" Center="50,50" />
</GeometryGroup>
</GeometryDrawing.Geometry>
<GeometryDrawing.Pen>
<Pen Brush="Gray" Thickness="10" />
</GeometryDrawing.Pen>
</GeometryDrawing>
</DrawingBrush.Drawing>
</DrawingBrush>
</Rectangle.Fill>
</Rectangle>
这些示例使用 DrawingBrush 对象来演示如何使用 AlignmentX 和 AlignmentY 属性。 这些属性对于所有磁贴画笔（DrawingBrush、ImageBrush 和 VisualBrush）的行为相同。 有关平铺画笔的详细信息，请参阅使用图像、绘图和视觉对象进行绘制。
