GraphicsPathIterator.NextPathType(Byte, Int32, Int32) Metodo
Definizione
Importante
Alcune informazioni sono relative alla release non definitiva del prodotto, che potrebbe subire modifiche significative prima della release definitiva. Microsoft non riconosce alcuna garanzia, espressa o implicita, in merito alle informazioni qui fornite.
Ottiene l'indice iniziale e l'indice finale del gruppo successivo di punti dati con lo stesso tipo.
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 -> intPublic Function NextPathType (ByRef pathType As Byte, ByRef startIndex As Integer, ByRef endIndex As Integer) As IntegerParametri
- pathType
- Byte
[out] Riceve il tipo di punto condiviso da tutti i punti del gruppo. I tipi possibili possono essere recuperati dall'enumerazione PathPointType.
- startIndex
- Int32
[out] Riceve l'indice iniziale del gruppo di punti.
- endIndex
- Int32
[out] Riceve l'indice finale del gruppo di punti.
Restituisce
Questo metodo restituisce il numero di punti dati nel gruppo. Se nel percorso non sono presenti più gruppi, questo metodo restituisce 0.
Esempio
L'esempio seguente è progettato per l'uso con Windows Form e richiede PaintEventArgse, un oggetto evento OnPaint. Il codice esegue le azioni seguenti:
Crea un oggetto GraphicsPath.
Aggiunge tre righe, un rettangolo e un'ellisse.
Elenca i valori di tutti i punti a sinistra dello schermo.
Crea un GraphicsPathIterator e lo riavvolge.
In un ciclo
forscorre i punti usando i metodi NextPathType e NextPathType.Usa i valori restituiti dalle chiamate iterative per elencare il numero del sottopercorso, il numero di punti in esso contenuti e il tipo del percorso punta al lato destro dello schermo.
Visualizza il valore per il numero totale di punti sullo schermo.
Si noti che ListPathPoints è una funzione helper che separa la maggior parte (non tutti) del codice di visualizzazione dal codice del percorso grafico.
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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