GraphicsPathIterator.NextSubpath Método

  • Referencia

Definición

Espacio de nombres:
System.Drawing.Drawing2D
Ensamblado:
System.Drawing.Common.dll
Ensamblado:
System.Drawing.dll
Paquete:
System.Drawing.Common v8.0.7
Paquete:
System.Drawing.Common v9.0.0-preview.6.24327.6

Mueve la subruta al siguiente subpath en el GraphicsPathespecificado.

Sobrecargas

NextSubpath(GraphicsPath, Boolean)

Obtiene la siguiente figura (subpath) de la ruta de acceso asociada de este GraphicsPathIterator.
NextSubpath(Int32, Int32, Boolean)

Mueve el GraphicsPathIterator a la siguiente subruta de la ruta de acceso. El índice de inicio y el índice final de la siguiente subruta se encuentran en los parámetros [out].

NextSubpath(GraphicsPath, Boolean)

Source:
GraphicsPathIterator.cs
Source:
GraphicsPathIterator.cs
Source:
GraphicsPathIterator.cs
Source:
GraphicsPathIterator.cs
Source:
GraphicsPathIterator.cs

Obtiene la siguiente figura (subpath) de la ruta de acceso asociada de este GraphicsPathIterator.

public:
 int NextSubpath(System::Drawing::Drawing2D::GraphicsPath ^ path, [Runtime::InteropServices::Out] bool % isClosed);
public int NextSubpath (System.Drawing.Drawing2D.GraphicsPath path, out bool isClosed);
member this.NextSubpath : System.Drawing.Drawing2D.GraphicsPath * bool -> int
Public Function NextSubpath (path As GraphicsPath, ByRef isClosed As Boolean) As Integer

Parámetros

path
GraphicsPath

Un GraphicsPath que es tener sus puntos de datos establecidos para que coincidan con los puntos de datos de la figura recuperada (subpath) para este iterador.

isClosed
Boolean

[out] Indica si la subruta actual está cerrada. Es true si la figura está cerrada; de lo contrario, es false.

Devoluciones

Int32

Número de puntos de datos de la figura recuperada (subpath). Si no hay más cifras que recuperar, se devuelve cero.

Ejemplos

El ejemplo siguiente está diseñado para su uso con Windows Forms y requiere PaintEventArgse, un objeto de evento OnPaint. El código realiza las siguientes acciones:

  • Crea un objeto GraphicsPath.

  • Agrega tres líneas, un rectángulo, una elipse y dos marcadores.

  • Enumera los valores de todos los puntos de la ruta de acceso al lado izquierdo de la pantalla.

  • Crea un objeto GraphicsPathIterator.

  • Crea un objeto GraphicsPath, myPathSection, para recibir puntos copiados.

  • Llama al método NextSubpath, que recorre en iteración la tercera subruta (figura) y copia todos los puntos contenidos en esa subruta en la ruta de acceso de myPathSection, y también devuelve el número de puntos copiados en subpathPoints.

  • Enumera el número de subruta y el número de puntos que contiene al lado derecho de la pantalla.

void NextSubpathExample2( PaintEventArgs^ e )
{
   // Create a graphics path.
   GraphicsPath^ myPath = gcnew GraphicsPath;

   // Set up primitives to add to myPath.
   array<Point>^ myPoints = {Point(20,20),Point(120,120),Point(20,120),Point(20,20)};
   Rectangle myRect = Rectangle(120,120,100,100);

   // Add 3 lines, a rectangle, an ellipse, and 2 markers.
   myPath->AddLines( myPoints );
   myPath->SetMarkers();
   myPath->AddRectangle( myRect );
   myPath->SetMarkers();
   myPath->AddEllipse( 220, 220, 100, 100 );

   // Get the total number of points for the path,
   // and the 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 all of the path's
   // points to 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 values of all the path points and types to the screen.
   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 );

   // Rewind the iterator.
   myPathIterator->Rewind();

   // Create the GraphicsPath section.
   GraphicsPath^ myPathSection = gcnew GraphicsPath;

   // Iterate to the 3rd subpath and list the number of points therein
   // to the screen.
   int subpathPoints;
   bool IsClosed2;

   // Iterate to the third subpath.
   subpathPoints = myPathIterator->NextSubpath( myPathSection, IsClosed2 );
   subpathPoints = myPathIterator->NextSubpath( myPathSection, IsClosed2 );
   subpathPoints = myPathIterator->NextSubpath( myPathSection, IsClosed2 );

   // Write the number of subpath points to the screen.
   e->Graphics->DrawString( String::Format( "Subpath: 3   Num Points: {0}", subpathPoints ), myFont, myBrush, 200, 20 );
}

public void NextSubpathExample2(PaintEventArgs e)
{
         
    // Create a graphics path.
    GraphicsPath myPath = new GraphicsPath();
         
    // Set up primitives to add to myPath.
    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);
         
    // Add 3 lines, a rectangle, an ellipse, and 2 markers.
    myPath.AddLines(myPoints);
    myPath.SetMarkers();
    myPath.AddRectangle(myRect);
    myPath.SetMarkers();
    myPath.AddEllipse(220, 220, 100, 100);
         
    // Get the total number of points for the path,
         
    // and the arrays of the points and types.
    int myPathPointCount = myPath.PointCount;
    PointF[] myPathPoints = myPath.PathPoints;
    byte[] myPathTypes = myPath.PathTypes;
         
    // Set up variables for listing all of the path's
         
    // points to the screen.
    int i;
    float j = 20;
    Font myFont = new Font("Arial", 8);
    SolidBrush myBrush = new SolidBrush(Color.Black);
         
    // List the values of all the path points and types to the screen.
    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);
         
    // Rewind the iterator.
    myPathIterator.Rewind();
         
    // Create the GraphicsPath section.
    GraphicsPath myPathSection = new GraphicsPath();
         
    // Iterate to the 3rd subpath and list the number of points therein
         
    // to the screen.
    int subpathPoints;
    bool IsClosed2;
         
    // Iterate to the third subpath.
    subpathPoints = myPathIterator.NextSubpath(
        myPathSection, out IsClosed2);
    subpathPoints = myPathIterator.NextSubpath(
        myPathSection, out IsClosed2);
    subpathPoints = myPathIterator.NextSubpath(
        myPathSection, out IsClosed2);
         
    // Write the number of subpath points to the screen.
    e.Graphics.DrawString("Subpath: 3"  +
        "   Num Points: " +
        subpathPoints.ToString(),
        myFont,
        myBrush,
        200,
        20);
}

Public Sub NextSubpathExample2(ByVal e As PaintEventArgs)

    ' Create a graphics path.
    Dim myPath As New GraphicsPath

    ' Set up primitives to add to myPath.
    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)

    ' Add 3 lines, a rectangle, an ellipse, and 2 markers.
    myPath.AddLines(myPoints)
    myPath.SetMarkers()
    myPath.AddRectangle(myRect)
    myPath.SetMarkers()
    myPath.AddEllipse(220, 220, 100, 100)

    ' Get the total number of points for the path,

    ' and the 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 drawing the array
    ' of points to 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)

    ' Draw the set of path points and types to the screen.
    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)

    ' Rewind the iterator.
    myPathIterator.Rewind()

    ' Create the GraphicsPath section.
    Dim myPathSection As New GraphicsPath

    ' Draw the 3rd subpath and the number of points therein
    ' to the screen.
    Dim subpathPoints As Integer
    Dim IsClosed2 As Boolean

    ' Iterate to the third subpath.
    subpathPoints = myPathIterator.NextSubpath(myPathSection, _
        IsClosed2)
    subpathPoints = myPathIterator.NextSubpath(myPathSection, _
        IsClosed2)
    subpathPoints = myPathIterator.NextSubpath(myPathSection, _
        IsClosed2)

    ' Write the number of subpath points to the screen.
    e.Graphics.DrawString("Subpath: 3" + "   Num Points: " + _
    subpathPoints.ToString(), myFont, myBrush, 200, 20)
End Sub

Se aplica a

NextSubpath(Int32, Int32, Boolean)

Source:
GraphicsPathIterator.cs
Source:
GraphicsPathIterator.cs
Source:
GraphicsPathIterator.cs
Source:
GraphicsPathIterator.cs
Source:
GraphicsPathIterator.cs

Mueve el GraphicsPathIterator a la siguiente subruta de la ruta de acceso. El índice de inicio y el índice final de la siguiente subruta se encuentran en los parámetros [out].

public:
 int NextSubpath([Runtime::InteropServices::Out] int % startIndex, [Runtime::InteropServices::Out] int % endIndex, [Runtime::InteropServices::Out] bool % isClosed);
public int NextSubpath (out int startIndex, out int endIndex, out bool isClosed);
member this.NextSubpath : int * int * bool -> int
Public Function NextSubpath (ByRef startIndex As Integer, ByRef endIndex As Integer, ByRef isClosed As Boolean) As Integer

Parámetros

startIndex
Int32

[out] Recibe el índice inicial de la siguiente subruta.

endIndex
Int32

[out] Recibe el índice final de la siguiente subruta.

isClosed
Boolean

[out] Indica si la subruta está cerrada.

Devoluciones

Int32

Número de subrutas del objeto GraphicsPath.

Ejemplos

El ejemplo siguiente está diseñado para su uso con Windows Forms y requiere PaintEventArgse, un objeto de evento OnPaint. El código realiza las siguientes acciones:

  • Crea un objeto GraphicsPath.

  • Agrega tres líneas, un rectángulo y una elipse.

  • Dibuja los valores de la matriz de puntos a la pantalla.

  • Crea un objeto GraphicsPathIterator.

  • Llama al método NextSubpath.

  • Usa los valores devueltos desde las llamadas iterativas a NextSubpath para dibujar los valores de inicio y detención de cada subruta a la pantalla.

  • Dibuja el valor del número total de subrutas a la pantalla.

private:
   void NextSubpathExample( PaintEventArgs^ e )
   {
      // Create the GraphicsPath.
      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);

      // Add 3 lines, a rectangle, an ellipse, and 2 markers.
      myPath->AddLines( myPoints );
      myPath->AddRectangle( myRect );
      myPath->AddEllipse( 220, 220, 100, 100 );

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

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

      // Draw the set of path points and types to the screen.
      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.
      GraphicsPathIterator^ myPathIterator = gcnew GraphicsPathIterator( myPath );
      int myStartIndex;
      int myEndIndex;
      bool myIsClosed;

      // get the number of Subpaths.
      int numSubpaths = myPathIterator->NextSubpath( myPath, myIsClosed );
      numSubpaths -= 1;

      // Rewind the Iterator.
      myPathIterator->Rewind();

      // List the Subpaths to the screen.
      j = 20;
      for ( i = 0; i < numSubpaths; i++ )
      {
         myPathIterator->NextSubpath( myStartIndex, myEndIndex, myIsClosed );
         String^ s = String::Format( "Subpath {0}:  Start: {1}", i, myStartIndex );
         s = s + String::Format( "  End: {0}  IsClosed: {1}", myEndIndex, myIsClosed );
         e->Graphics->DrawString( s, myFont, myBrush, 200, j );
         j += 20;
      }

      // Draw the total number of Subpaths to the screen.
      j += 20;
      e->Graphics->DrawString( String::Format( "Number Subpaths = {0}", numSubpaths ), myFont, myBrush, 200, j );
   }

private void NextSubpathExample(PaintEventArgs e)
{
             
    // Create the GraphicsPath.
    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);
             
    // Add 3 lines, a rectangle, an ellipse, and 2 markers.
    myPath.AddLines(myPoints);
    myPath.AddRectangle(myRect);
    myPath.AddEllipse(220, 220, 100, 100);
             
    // Get the total number of points for the path,
             
    // and the arrays of the points and types.
    int myPathPointCount = myPath.PointCount;
    PointF[] myPathPoints = myPath.PathPoints;
    byte[] myPathTypes = myPath.PathTypes;
             
    // Set up variables for drawing the array of
             
    // points to the screen.
    int i;
    float j = 20;
    Font myFont = new Font("Arial", 8);
    SolidBrush myBrush = new SolidBrush(Color.Black);
             
    // Draw the set of path points and types to the screen.
    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.
    GraphicsPathIterator myPathIterator = new
        GraphicsPathIterator(myPath);
    int myStartIndex;
    int myEndIndex;
    bool myIsClosed;
             
    // get the number of Subpaths.
    int numSubpaths = myPathIterator.NextSubpath(myPath,
        out myIsClosed);
    numSubpaths -= 1;
             
    // Rewind the Iterator.
    myPathIterator.Rewind();
             
    // List the Subpaths to the screen.
    j=20;
    for(i=0;i<numSubpaths;i++)
    {
        myPathIterator.NextSubpath(out myStartIndex,
            out myEndIndex,
            out myIsClosed);
        e.Graphics.DrawString("Subpath " + i.ToString() +
            ":  Start: " + myStartIndex.ToString()+
            "  End: " + myEndIndex.ToString() +
            "  IsClosed: " + myIsClosed.ToString(),
            myFont,
            myBrush,
            200,
            j);
        j += 20;
    }
             
    // Draw the total number of Subpaths to the screen.
    j += 20;
    e.Graphics.DrawString("Number Subpaths = " +
        numSubpaths.ToString(),
        myFont,
        myBrush,
        200,
        j);
}

Public Sub NextSubpathExample(ByVal e As PaintEventArgs)

    ' Create the GraphicsPath.
    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)

    ' Add 3 lines, a rectangle, an ellipse, and 2 markers.
    myPath.AddLines(myPoints)
    myPath.AddRectangle(myRect)
    myPath.AddEllipse(220, 220, 100, 100)

    ' Get the total number of points for the path,
    ' and the 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 drawing the array of points to 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)

    ' Draw the set of path points and types to the screen.
    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.
    Dim myPathIterator As New GraphicsPathIterator(myPath)
    Dim myStartIndex As Integer
    Dim myEndIndex As Integer
    Dim myIsClosed As Boolean

    ' get the number of Subpaths.
    Dim numSubpaths As Integer = myPathIterator.NextSubpath(myPath, _
        myIsClosed)
    numSubpaths -= 1

    ' Rewind the Iterator.
    myPathIterator.Rewind()

    ' List the Subpaths to the screen.
    j = 20
    For i = 0 To numSubpaths - 1
        myPathIterator.NextSubpath(myStartIndex, myEndIndex, _
        myIsClosed)
        e.Graphics.DrawString("Subpath " + i.ToString() + _
            ":  Start: " + myStartIndex.ToString() + "  End: " + _
            myEndIndex.ToString() + "  IsClosed: " + _
            myIsClosed.ToString(), myFont, myBrush, 200, j)
        j += 20
    Next i

    ' Draw the total number of Subpaths to the screen.
    j += 20
    e.Graphics.DrawString("Number Subpaths = " + _
        numSubpaths.ToString(), myFont, myBrush, 200, j)
End Sub

Se aplica a