如何：建立複合圖案

此範例顯示如何使用 Geometry 物件來建立複合圖形，然後使用 Path 元素予以顯示。 在下列範例中，搭配使用 LineGeometry、EllipseGeometry 和 RectangleGeometry 與 GeometryGroup，以建立複合圖形。 然後使用 Path 元素來繪製幾何。

範例

<!-- Displays the geometry. --> 
<Path Stroke="Black" StrokeThickness="1" Fill="#CCCCFF">
  <Path.Data>
  
    <!-- Creates a composite shape from three geometries. -->
    <GeometryGroup FillRule="EvenOdd">
      <LineGeometry StartPoint="10,10" EndPoint="50,30" />
      <EllipseGeometry Center="40,70" RadiusX="30" RadiusY="30" />              
      <RectangleGeometry Rect="30,55 100 30" />
    </GeometryGroup>
  </Path.Data>
</Path>

// Create a Path to be drawn to the screen.
Path myPath = new Path();
myPath.Stroke = Brushes.Black;
myPath.StrokeThickness = 1;
SolidColorBrush mySolidColorBrush = new SolidColorBrush();
mySolidColorBrush.Color = Color.FromArgb(255, 204, 204, 255);
myPath.Fill = mySolidColorBrush;

// Create the line geometry to add to the Path
LineGeometry myLineGeometry = new LineGeometry();
myLineGeometry.StartPoint = new Point(10, 10);
myLineGeometry.EndPoint = new Point(50, 30);

// Create the ellipse geometry to add to the Path
EllipseGeometry myEllipseGeometry = new EllipseGeometry();
myEllipseGeometry.Center = new Point(40, 70);
myEllipseGeometry.RadiusX = 30;
myEllipseGeometry.RadiusY = 30;

// Create a rectangle geometry to add to the Path
RectangleGeometry myRectGeometry = new RectangleGeometry();
myRectGeometry.Rect = new Rect(30, 55, 100, 30);

// Add all the geometries to a GeometryGroup.
GeometryGroup myGeometryGroup = new GeometryGroup();
myGeometryGroup.Children.Add(myLineGeometry);
myGeometryGroup.Children.Add(myEllipseGeometry);
myGeometryGroup.Children.Add(myRectGeometry);

myPath.Data = myGeometryGroup;

// Add path shape to the UI.
StackPanel mainPanel = new StackPanel();
mainPanel.Children.Add(myPath);
this.Content = mainPanel;

' Create a Path to be drawn to the screen.
Dim myPath As New Path()
myPath.Stroke = Brushes.Black
myPath.StrokeThickness = 1
Dim mySolidColorBrush As New SolidColorBrush()
mySolidColorBrush.Color = Color.FromArgb(255, 204, 204, 255)
myPath.Fill = mySolidColorBrush

' Create the line geometry to add to the Path
Dim myLineGeometry As New LineGeometry()
myLineGeometry.StartPoint = New Point(10, 10)
myLineGeometry.EndPoint = New Point(50, 30)

' Create the ellipse geometry to add to the Path
Dim myEllipseGeometry As New EllipseGeometry()
myEllipseGeometry.Center = New Point(40, 70)
myEllipseGeometry.RadiusX = 30
myEllipseGeometry.RadiusY = 30

' Create a rectangle geometry to add to the Path
Dim myRectGeometry As New RectangleGeometry()
myRectGeometry.Rect = New Rect(30, 55, 100, 30)

' Add all the geometries to a GeometryGroup.
Dim myGeometryGroup As New GeometryGroup()
myGeometryGroup.Children.Add(myLineGeometry)
myGeometryGroup.Children.Add(myEllipseGeometry)
myGeometryGroup.Children.Add(myRectGeometry)

myPath.Data = myGeometryGroup

' Add path shape to the UI.
Dim mainPanel As New StackPanel()
mainPanel.Children.Add(myPath)
Me.Content = mainPanel

下圖顯示上一個範例中所建立的圖案。

複合幾何

使用 PathGeometry 可以建立更複雜的圖形 (例如多邊形) 以及具有弧形線段的圖形。 如需顯示如何使用 PathGeometry 來建立圖形的範例，請參閱使用 PathGeometry 建立圖形。 雖然此範例使用 Path 元素以將圖形轉譯至畫面，但也可能會使用 Geometry 物件來描述 GeometryDrawing 或 DrawingContext 的內容。 其也可能用於裁剪和點擊測試。

這個範例屬於較大型的範例；如需完整範例，請參閱幾何範例。