GraphicsPathIterator.NextMarker Method

Definition

Namespace:

System.Drawing.Drawing2D

Assembly:

System.Drawing.Common.dll

Moves the iterator to the next marker in the path.

Overloads

NextMarker(GraphicsPath)	This GraphicsPathIterator object has a GraphicsPath object associated with it. The NextMarker(GraphicsPath) method increments the associated GraphicsPath to the next marker in its path and copies all the points contained between the current marker and the next marker (or end of path) to a second GraphicsPath object passed in to the parameter.
NextMarker(Int32, Int32)	Increments the GraphicsPathIterator to the next marker in the path and returns the start and stop indexes by way of the [out] parameters.

NextMarker(GraphicsPath)

This GraphicsPathIterator object has a GraphicsPath object associated with it. The NextMarker(GraphicsPath) method increments the associated GraphicsPath to the next marker in its path and copies all the points contained between the current marker and the next marker (or end of path) to a second GraphicsPath object passed in to the parameter.

public:
 int NextMarker(System::Drawing::Drawing2D::GraphicsPath ^ path);

public int NextMarker (System.Drawing.Drawing2D.GraphicsPath path);

member this.NextMarker : System.Drawing.Drawing2D.GraphicsPath -> int

Public Function NextMarker (path As GraphicsPath) As Integer

Parameters

path

GraphicsPath

The GraphicsPath object to which the points will be copied.

Returns

Int32

The number of points between this marker and the next.

Examples

The following example is designed for use with Windows Forms, and it requires PaintEventArgs e, an OnPaint event object. The code performs the following actions:

• Creates a GraphicsPath object.

• Adds three lines, a rectangle, an ellipse, and two markers.

• Lists the values of all the path's points to the left side of the screen.

• Creates a GraphicsPathIterator object.

• Creates a GraphicsPath object, myPathSection, to receive copied points.

• Calls the NextMarker method, which iterates to the first marker and copies all the points contained between that marker and the next to myPathSection.

• Returns the number of points copied to markerPoints.

• Lists the marker number (the first marker) and number of points it contains to the right side of the screen.

public:
   void NextMarkerExample2( 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 the values 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 for all of path points and types to
      // the left side of 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 );

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

      // Create a GraphicsPath to receive a section of myPath.
      GraphicsPath^ myPathSection = gcnew GraphicsPath;

      // Retrieve and list the number of points contained in
      // the first marker to the right side of the screen.
      int markerPoints;
      markerPoints = myPathIterator->NextMarker( myPathSection );
      e->Graphics->DrawString( String::Format( "Marker: 1  Num Points: {0}", markerPoints ), myFont, myBrush, 200, 20 );
   }

public void NextMarkerExample2(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 the values 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 for all of path points and types to
    // the left side of 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);
             
    // Rewind the iterator.
    myPathIterator.Rewind();
             
    // Create a GraphicsPath to receive a section of myPath.
    GraphicsPath myPathSection = new GraphicsPath();
             
    // Retrieve and list the number of points contained in
             
    // the first marker to the right side of the screen.
    int markerPoints;
    markerPoints = myPathIterator.NextMarker(myPathSection);
    e.Graphics.DrawString("Marker: 1" + "  Num Points: " +
        markerPoints.ToString(),  myFont, myBrush, 200, 20);
}

Public Sub NextMarkerExample2(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.
    Dim myPathIterator As New GraphicsPathIterator(myPath)

    ' Rewind the iterator.
    myPathIterator.Rewind()

    ' Create a GraphicsPath section.
    Dim myPathSection As New GraphicsPath

    ' List the points contained in the first marker
    ' to the screen.
    Dim markerPoints As Integer
    markerPoints = myPathIterator.NextMarker(myPathSection)
    e.Graphics.DrawString("Marker: 1" + "  Num Points: " + _
        markerPoints.ToString(), myFont, myBrush, 200, 20)
End Sub

Remarks

Use the SetMarkers method to set markers in a path. Markers are used to create groups of subpaths. One or more subpaths can be between two markers.

NextMarker(Int32, Int32)

Increments the GraphicsPathIterator to the next marker in the path and returns the start and stop indexes by way of the [out] parameters.

public:
 int NextMarker([Runtime::InteropServices::Out] int % startIndex, [Runtime::InteropServices::Out] int % endIndex);

public int NextMarker (out int startIndex, out int endIndex);

member this.NextMarker : int * int -> int

Public Function NextMarker (ByRef startIndex As Integer, ByRef endIndex As Integer) As Integer

Parameters

startIndex

Int32

[out] The integer reference supplied to this parameter receives the index of the point that starts a subpath.

endIndex

Int32

[out] The integer reference supplied to this parameter receives the index of the point that ends the subpath to which startIndex points.

Returns

Int32

The number of points between this marker and the next.

Examples

The following example is designed for use with Windows Forms, and it requires PaintEventArgs e, an OnPaint event object. The code performs the following actions:

• Creates a GraphicsPath object.

• Adds three lines, a rectangle, and an ellipse ¾ with markers between each.

• Draws the values for the array of points to the screen.

• Creates a GraphicsPathIterator object.

• Calls the NextMarker method.

• Uses the values returned from the iterative calls to NextMarker to draw the start and stop points for each marker to the screen.

• Draws the value for the total number of points to the screen.

private:
   void NextMarkerExample( 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->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 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;

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

      // Draw the Markers and their start and end points
      // to the screen.
      j = 20;
      for ( i = 0; i < 3; i++ )
      {
         myPathIterator->NextMarker( myStartIndex, myEndIndex );
         e->Graphics->DrawString( String::Format( "Marker {0}:  Start: {1}  End: {2}", i, myStartIndex, myEndIndex ),
               myFont, myBrush, 200, j );
         j += 20;
      }

      // Draw the total number of points to the screen.
      j += 20;
      int myPathTotalPoints = myPathIterator->Count;
      e->Graphics->DrawString( String::Format( "Total Points = {0}", myPathTotalPoints ), myFont, myBrush, 200, j );
   }

private void NextMarkerExample(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.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 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;
             
    // Rewind the Iterator.
    myPathIterator.Rewind();
             
    // Draw the Markers and their start and end points
             
    // to the screen.
    j=20;
    for(i=0;i<3;i++)
    {
        myPathIterator.NextMarker(out myStartIndex, out myEndIndex);
        e.Graphics.DrawString("Marker " + i.ToString() +
            ":  Start: " + myStartIndex.ToString()+
            "  End: " + myEndIndex.ToString(),
            myFont,
            myBrush,
            200,
            j);
        j += 20;
    }
             
    // Draw the total number of points to the screen.
    j += 20;
    int myPathTotalPoints = myPathIterator.Count;
    e.Graphics.DrawString("Total Points = " +
        myPathTotalPoints.ToString(),
        myFont,
        myBrush,
        200,
        j);
}

Public Sub NextMarkerExample(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.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.
    Dim myPathIterator As New GraphicsPathIterator(myPath)
    Dim myStartIndex As Integer
    Dim myEndIndex As Integer

    ' Rewind the Iterator.
    myPathIterator.Rewind()

    ' Draw the Markers and their start and end points to the screen.
    j = 20
    For i = 0 To 2
        myPathIterator.NextMarker(myStartIndex, myEndIndex)
        e.Graphics.DrawString("Marker " + i.ToString() + _
            ":  Start: " + myStartIndex.ToString() + "  End: " + _
            myEndIndex.ToString(), myFont, myBrush, 200, j)
        j += 20
    Next i

    ' Draw the total number of points to the screen.
    j += 20
    Dim myPathTotalPoints As Integer = myPathIterator.Count
    e.Graphics.DrawString("Total Points = " + _
        myPathTotalPoints.ToString(), myFont, myBrush, 200, j)
End Sub

Remarks

Use the SetMarkers method to set markers in a path. Markers are used to create groups of subpaths. One or more subpaths can be between two markers.