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GraphicsPathIterator.NextPathType(Byte, Int32, Int32) Metoda

Definice

Získá počáteční index a koncový index další skupiny datových bodů, které mají stejný typ.

public:
 int NextPathType([Runtime::InteropServices::Out] System::Byte % pathType, [Runtime::InteropServices::Out] int % startIndex, [Runtime::InteropServices::Out] int % endIndex);
public int NextPathType (out byte pathType, out int startIndex, out int endIndex);
member this.NextPathType : byte * int * int -> int
Public Function NextPathType (ByRef pathType As Byte, ByRef startIndex As Integer, ByRef endIndex As Integer) As Integer

Parametry

pathType
Byte

[ven] Přijme typ bodu sdílený všemi body ve skupině. Možné typy lze načíst z PathPointType výčtu.

startIndex
Int32

[ven] Přijme počáteční index skupiny bodů.

endIndex
Int32

[ven] Získá koncový index skupiny bodů.

Návraty

Tato metoda vrátí počet datových bodů ve skupině. Pokud cesta neobsahuje žádné další skupiny, vrátí tato metoda hodnotu 0.

Příklady

Následující příklad je navržený pro použití s Windows Forms a vyžaduje PaintEventArgse, objekt události OnPaint. Kód provede následující akce:

  • Vytvoří objekt GraphicsPath.

  • Přidá tři čáry, obdélník a tři tečky.

  • Zobrazí hodnoty všech bodů na levou stranu obrazovky.

  • Vytvoří GraphicsPathIterator a převinou se zpět.

  • Ve smyčce for prochází body pomocí NextPathType a NextPathType metod.

  • Používá hodnoty vrácené z iterativních volání k výpisu čísla dílčí cesty, počtu bodů v něm a typu cesty odkazuje na pravou stranu obrazovky.

  • Zobrazí hodnotu celkového počtu bodů na obrazovku.

Všimněte si, že ListPathPoints je pomocná funkce, která odděluje většinu (ne všechny) kódu zobrazení od kódu grafické cesty.

public:
   void NextPathTypeExample( 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, and an ellipse.
      myPath->AddLines( myPoints );
      myPath->AddRectangle( myRect );
      myPath->AddEllipse( 220, 220, 100, 100 );

      // List all of the path points to the screen.
      ListPathPoints( e, myPath, nullptr, 20, 1 );

      // Create a GraphicsPathIterator.
      GraphicsPathIterator^ myPathIterator = gcnew GraphicsPathIterator( myPath );

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

      // Iterate the subpaths and types, and list the results to
      // the screen.
            int i;
      int j = 20;
      int mySubPaths;
      int subPathStartIndex;
      int subPathEndIndex;
      Boolean IsClosed;
      Byte subPathPointType;
      int pointTypeStartIndex;
      int pointTypeEndIndex;
      int numPointsFound;
      System::Drawing::Font^ myFont = gcnew System::Drawing::Font( "Arial",8 );
      SolidBrush^ myBrush = gcnew SolidBrush( Color::Black );
      j = 20;
      for ( i = 0; i < 3; i++ )
      {
         mySubPaths = myPathIterator->NextSubpath( subPathStartIndex, subPathEndIndex, IsClosed );
         numPointsFound = myPathIterator->NextPathType( subPathPointType, pointTypeStartIndex, pointTypeEndIndex );
         e->Graphics->DrawString( String::Format( "SubPath: {0}  Points Found: {1}  Type of Points: {2}", i,
               numPointsFound, subPathPointType ), myFont, myBrush, 200.0f, (float)j );
         j += 20;
      }

      // List the total number of path points to the screen.
      ListPathPoints( e, myPath, myPathIterator, 200, 2 );
   }

   //-------------------------------------------------------
   //This function is a helper function used by
   // NextPathTypeExample.
   //-------------------------------------------------------
   void ListPathPoints( PaintEventArgs^ e, GraphicsPath^ myPath, GraphicsPathIterator^ myPathIterator, int xOffset, int listType )
   {
      // 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 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 );
      if ( listType == 1 )
      {
         // 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, (float)xOffset, (float)j );
            j += 20;
         }
      }
      else
      if ( listType == 2 )
      {
         // Draw the total number of points to the screen.
         int myPathTotalPoints = myPathIterator->Count;
         e->Graphics->DrawString( String::Format( "Total Points = {0}", myPathTotalPoints ), myFont, myBrush, (float)xOffset, 100.0f );
      }
      else
      {
         e->Graphics->DrawString( "Wrong or no list type argument.", myFont, myBrush, (float)xOffset, 200.0f );
      }
   }
public void NextPathTypeExample(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, and an ellipse.
    myPath.AddLines(myPoints);
    myPath.AddRectangle(myRect);
    myPath.AddEllipse(220, 220, 100, 100);
             
    // List all of the path points to the screen.
    ListPathPoints(e, myPath, null, 20, 1);
             
    // Create a GraphicsPathIterator.
    GraphicsPathIterator myPathIterator = new
        GraphicsPathIterator(myPath);
             
    // Rewind the Iterator.
    myPathIterator.Rewind();
             
    // Iterate the subpaths and types, and list the results to
             
    // the screen.
    int i, j = 20;
    int mySubPaths, subPathStartIndex, subPathEndIndex;
    Boolean IsClosed;
    byte subPathPointType;
    int pointTypeStartIndex,  pointTypeEndIndex, numPointsFound;
    Font myFont = new Font("Arial", 8);
    SolidBrush myBrush = new SolidBrush(Color.Black);
    j = 20;
    for(i = 0;i < 3; i++)
    {
        mySubPaths = myPathIterator.NextSubpath(
            out subPathStartIndex,
            out subPathEndIndex,
            out IsClosed);
        numPointsFound = myPathIterator.NextPathType(
            out subPathPointType,
            out pointTypeStartIndex,
            out pointTypeEndIndex);
        e.Graphics.DrawString(
            "SubPath: " + i +
            "  Points Found: " + numPointsFound.ToString() +
            "  Type of Points: " + subPathPointType.ToString(),
            myFont,
            myBrush,
            200,
            j);
        j+=20;
    }
             
    // List the total number of path points to the screen.
    ListPathPoints(e, myPath, myPathIterator, 200, 2);
}
             
//-------------------------------------------------------
//This function is a helper function used by
// NextPathTypeExample.
//-------------------------------------------------------
public void ListPathPoints(
    PaintEventArgs e,
    GraphicsPath myPath,
    GraphicsPathIterator myPathIterator,
    int xOffset,
    int listType)
{
             
    // 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 points to the screen.
    int i;
    float j = 20;
    Font myFont = new Font("Arial", 8);
    SolidBrush myBrush = new SolidBrush(Color.Black);
    if (listType == 1) 
        // List all the path points to the screen.
    {
             
        // 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,
                xOffset,
                j);
            j+=20;
        }
    }
    else if (listType == 2) 
        // Display the total number of path points.
    {
             
        // Draw the total number of points to the screen.
        int myPathTotalPoints = myPathIterator.Count;
        e.Graphics.DrawString("Total Points = " +
            myPathTotalPoints.ToString(),
            myFont,
            myBrush,
            xOffset,
            100);
    }
    else
    {
        e.Graphics.DrawString("Wrong or no list type argument.",
            myFont, myBrush, xOffset, 200);
    }
}
Public Sub NextPathTypeExample(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, and an ellipse.
    myPath.AddLines(myPoints)
    myPath.AddRectangle(myRect)
    myPath.AddEllipse(220, 220, 100, 100)

    ' List all of the path points to the screen.
    ListPathPointsHelper(e, myPath, Nothing, 20, 1)

    ' Create a GraphicsPathIterator.
    Dim myPathIterator As New GraphicsPathIterator(myPath)

    ' Rewind the Iterator.
    myPathIterator.Rewind()

    ' Iterate the subpaths and types, and list the results
    ' to the screen.
    Dim j As Integer = 20
    Dim i As Integer
    Dim mySubPaths, subPathStartIndex, subPathEndIndex As Integer
    Dim IsClosed As [Boolean]
    Dim subPathPointType As Byte
    Dim pointTypeStartIndex, pointTypeEndIndex, _
    numPointsFound As Integer
    Dim myFont As New Font("Arial", 8)
    Dim myBrush As New SolidBrush(Color.Black)
    j = 20
    For i = 0 To 2
        mySubPaths = myPathIterator.NextSubpath(subPathStartIndex, _
            subPathEndIndex, IsClosed)
        numPointsFound = myPathIterator.NextPathType(subPathPointType, _
            pointTypeStartIndex, pointTypeEndIndex)
        e.Graphics.DrawString("SubPath: " & i & "  Points Found: " & _
            numPointsFound.ToString() & "  Type of Points: " & _
        subPathPointType.ToString(), myFont, myBrush, 200, j)
        j += 20
    Next i

    ' List the total number of path points to the screen.
    ListPathPointsHelper(e, myPath, myPathIterator, 200, 2)
End Sub

' This is a helper function used by NextPathTypeExample.
Public Sub ListPathPointsHelper(ByVal e As PaintEventArgs, _
ByVal myPath As GraphicsPath, ByVal myPathIterator As GraphicsPathIterator, _
ByVal xOffset As Integer, ByVal listType As Integer)

    ' 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 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)
    If listType = 1 Then
        ' List all the path points to the screen.

        ' 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, xOffset, j)
            j += 20
        Next i
    Else
        If listType = 2 Then
            ' Display the total number of path points.

            ' Draw the total number of points to the screen.
            Dim myPathTotalPoints As Integer = myPathIterator.Count
            e.Graphics.DrawString("Total Points = " + _
                myPathTotalPoints.ToString(), myFont, myBrush, xOffset, _
                100)
        Else
            e.Graphics.DrawString("Wrong or no list type argument.", _
                myFont, myBrush, xOffset, 200)
        End If
    End If
End Sub

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