GraphicsPathIterator.Enumerate(PointF[], Byte[]) 方法

定义

命名空间:

System.Drawing.Drawing2D

程序集:

System.Drawing.Common.dll

包:

System.Drawing.Common v8.0.0

Source:

GraphicsPathIterator.cs

将关联的 GraphicsPath 的 PathPoints 属性和 PathTypes 属性数组复制到两个指定的数组中。

public:
 int Enumerate(cli::array <System::Drawing::PointF> ^ % points, cli::array <System::Byte> ^ % types);

public int Enumerate (ref System.Drawing.PointF[] points, ref byte[] types);

member this.Enumerate : PointF[] * Byte[] -> int

Public Function Enumerate (ByRef points As PointF(), ByRef types As Byte()) As Integer

参数

points

PointF[]

返回时，包含 PointF 结构的数组，该数组表示路径中的点。

types

Byte[]

返回时，包含字节数组，该数组表示路径中的点类型。

返回

Int32

复制的点数。

示例

以下示例设计用于 Windows 窗体，它需要 PaintEventArgse事件OnPaint对象。 此代码执行以下操作：

• 创建图形路径。

• 使用多个基元和一些标记填充它。

• Lists屏幕左侧的路径数据。

• GraphicsPathIterator创建 并回退它。

• 将路径数据索引递增到第二个标记。

• 调用 方法， Enumerate 将路径数据复制到 points 和 types 数组。

• Lists屏幕右侧复制的此数据。

public:
   void EnumerateExample( PaintEventArgs^ e )
   {
      GraphicsPath^ myPath = gcnew GraphicsPath;
      array<Point>^ myPoints = {Point(20,20),Point(120,120),Point(20,120),Point(20,20)};
      Rectangle myRect = Rectangle(120,120,100,100);
      myPath->AddLines( myPoints );
      myPath->AddRectangle( myRect );
      myPath->AddEllipse( 220, 220, 100, 100 );

      // Get the total number of points for the path, and arrays of
      // the  points and types.
      int myPathPointCount = myPath->PointCount;
      array<PointF>^myPathPoints = myPath->PathPoints;
      array<Byte>^myPathTypes = myPath->PathTypes;

      // Set up variables for listing the array of points on the left
      // side of the screen.
      int i;
      float j = 20;
      System::Drawing::Font^ myFont = gcnew System::Drawing::Font( "Arial",8 );
      SolidBrush^ myBrush = gcnew SolidBrush( Color::Black );

      // List the set of points and types and types to the left side
      // of the screen.
      e->Graphics->DrawString( "Original Data", myFont, myBrush, 20, j );
      j += 20;
      for ( i = 0; i < myPathPointCount; i++ )
      {
         e->Graphics->DrawString( myPathPoints[ i ].X + ", " + myPathPoints[ i ].Y + ", " + myPathTypes[ i ], myFont, myBrush, 20, j );
         j += 20;
      }

      // Create a GraphicsPathIterator for myPath.
      GraphicsPathIterator^ myPathIterator = gcnew GraphicsPathIterator( myPath );
      myPathIterator->Rewind();
      array<PointF>^points = gcnew array<PointF>(myPathIterator->Count);
      array<Byte>^types = gcnew array<Byte>(myPathIterator->Count);

      // int numPoints = myPathIterator->Enumerate(&points, &types);
      // Draw the set of copied points and types to the screen.
      j = 20;
      e->Graphics->DrawString( "Copied Data", myFont, myBrush, 200, j );
      j += 20;
      for ( i = 0; i < points->Length; i++ )
      {
         e->Graphics->DrawString( String::Format( "Point: {0}, Value: {1}, Type: {2}", i, points[ i ], types[ i ] ), myFont, myBrush, 200, j );
         j += 20;
      }
   }

public void EnumerateExample(PaintEventArgs e)
{
    GraphicsPath myPath = new GraphicsPath();
    Point[] myPoints =
             {
                 new Point(20, 20),
                 new Point(120, 120),
                 new Point(20, 120),
                 new Point(20, 20)
             };
    Rectangle myRect = new Rectangle(120, 120, 100, 100);
    myPath.AddLines(myPoints);
    myPath.AddRectangle(myRect);
    myPath.AddEllipse(220, 220, 100, 100);
             
    // Get the total number of points for the path, and arrays of
    // the  points and types.
    int myPathPointCount = myPath.PointCount;
    PointF[] myPathPoints = myPath.PathPoints;
    byte[] myPathTypes = myPath.PathTypes;
             
    // Set up variables for listing the array of points on the left
    // side of the screen.
    int i;
    float j = 20;
    Font myFont = new Font("Arial", 8);
    SolidBrush myBrush = new SolidBrush(Color.Black);
             
    // List the set of points and types and types to the left side
    // of the screen.
    e.Graphics.DrawString("Original Data",
        myFont,
        myBrush,
        20,
        j);
    j += 20;
    for(i=0; i<myPathPointCount; i++)
    {
        e.Graphics.DrawString(myPathPoints[i].X.ToString()+
            ", " + myPathPoints[i].Y.ToString() + ", " +
            myPathTypes[i].ToString(),
            myFont,
            myBrush,
            20,
            j);
        j+=20;
    }
             
    // Create a GraphicsPathIterator for myPath.
    GraphicsPathIterator myPathIterator =
        new GraphicsPathIterator(myPath);
    myPathIterator.Rewind();
    PointF[] points = new PointF[myPathIterator.Count];
    byte[] types = new byte[myPathIterator.Count];
    int numPoints = myPathIterator.Enumerate(ref points, ref types);
             
    // Draw the set of copied points and types to the screen.
    j = 20;
    e.Graphics.DrawString("Copied Data",
        myFont,
        myBrush,
        200,
        j);
    j += 20;
    for(i=0; i<points.Length; i++)
    {
        e.Graphics.DrawString("Point: " + i +
            ", " + "Value: " + points[i].ToString() + ", " +
            "Type: " + types[i].ToString(),
            myFont,
            myBrush,
            200,
            j);
        j+=20;
    }
}

Public Sub EnumerateExample(ByVal e As PaintEventArgs)
    Dim myPath As New GraphicsPath
    Dim myPoints As Point() = {New Point(20, 20), _
        New Point(120, 120), New Point(20, 120), New Point(20, 20)}
    Dim myRect As New Rectangle(120, 120, 100, 100)
    myPath.AddLines(myPoints)
    myPath.AddRectangle(myRect)
    myPath.AddEllipse(220, 220, 100, 100)

    ' Get the total number of points for the path, and arrays of the
    ' points and types.
    Dim myPathPointCount As Integer = myPath.PointCount
    Dim myPathPoints As PointF() = myPath.PathPoints
    Dim myPathTypes As Byte() = myPath.PathTypes

    ' Set up variables for listing the array of points on the left side
    ' of the screen.
    Dim i As Integer
    Dim j As Single = 20
    Dim myFont As New Font("Arial", 8)
    Dim myBrush As New SolidBrush(Color.Black)

    ' List the set of points and types and types to the left side of
    ' the screen.
    e.Graphics.DrawString("Original Data", myFont, myBrush, 20, j)
    j += 20
    For i = 0 To myPathPointCount - 1
        e.Graphics.DrawString(myPathPoints(i).X.ToString() & ", " & _
        myPathPoints(i).Y.ToString() & ", " & _
        myPathTypes(i).ToString(), myFont, myBrush, 20, j)
        j += 20
    Next i

    ' Create a GraphicsPathIterator for myPath.
    Dim myPathIterator As New GraphicsPathIterator(myPath)
    myPathIterator.Rewind()
    Dim points(myPathIterator.Count) As PointF
    Dim types(myPathIterator.Count) As Byte
    Dim numPoints As Integer = myPathIterator.Enumerate(points, types)

    ' Draw the set of copied points and types to the screen.
    j = 20
    e.Graphics.DrawString("Copied Data", myFont, myBrush, 200, j)
    j += 20
    For i = 0 To points.Length - 1
        e.Graphics.DrawString("Point: " & i & ", " & "Value: " & _
            points(i).ToString() & ", " & "Type: " & _
            types(i).ToString(), myFont, myBrush, 200, j)
        j += 20
    Next i
End Sub