Proprietà Stroke.PolylineCusps
Aggiornamento: novembre 2007
Ottiene una matrice che contiene gli indici delle cuspidi dell'oggetto Stroke.
Spazio dei nomi: Microsoft.Ink
Assembly: Microsoft.Ink (in Microsoft.Ink.dll)
Sintassi
'Dichiarazione
Public ReadOnly Property PolylineCusps As Integer()
'Utilizzo
Dim instance As Stroke
Dim value As Integer()
value = instance.PolylineCusps
public int[] PolylineCusps { get; }
public:
property array<int>^ PolylineCusps {
array<int>^ get ();
}
/** @property */
public int[] get_PolylineCusps()
public function get PolylineCusps () : int[]
Valore proprietà
Tipo: array<System.Int32[]
Matrice degli indici dei punti che costituiscono le cuspidi dell'oggetto Stroke.
Note
La matrice restituita dalla proprietà PolylineCusps è un indice nella matrice restituita dal metodo GetPoints. Ogni indice nella proprietà PolylineCusps corrisponde a un punto nella matrice restituita dal metodo GetPoints che rappresenta un cuspide dei punti del tratto.
Un cuspide è un punto del tratto in cui la direzione della scrittura cambia in modo discontinuo. Ad esempio, se il tratto rappresenta la lettera maiuscola "L", questa proprietà restituisce tre cuspidi: due corrispondenti al primo e all'ultimo punto di controllo del tratto e la terza corrispondente all'angolo della "L".
La posizione di un cuspide può essere determinata utilizzando il cuspide come un indice della matrice restituita dal metodo GetPoints.
Esempi
In questo esempio di C# vengono illustrati diversi tipi di informazioni registrate con ogni oggetto Stroke. Nel programma chiamante vengono utilizzate voci di menu per attivare o disattivare la visualizzazione di punti, cuspidi di polilinea, punti e cuspidi di Bézier e autointersezioni di ogni tratto. Il metodo InkSpaceToPixel dell'oggetto Renderer viene utilizzato per convertire i punti per la visualizzazione. Il metodo LocatePoint viene utilizzato per interpolare le posizioni delle autointersezioni.
Microsoft.Ink.InkCollector theInkCollector;
// Event handler for the form's load event.
private void Form1_Load(object sender, System.EventArgs e)
{
// Create the InkCollector.
theInkCollector = new InkCollector(this.Handle);
// Attach an event handler for the Stroke event.
theInkCollector.Stroke += new InkCollectorStrokeEventHandler(theInkCollector_Stroke);
// Enable the InkCollector.
theInkCollector.Enabled = true;
}
// Event handler for the InkCollector's Stroke event.
private void theInkCollector_Stroke(object sender, InkCollectorStrokeEventArgs e)
{
// Force the form to repaint.
Refresh();
}
// Event handler for the Clear menu's Click event.
private void menuClear_Click(object sender, System.EventArgs e)
{
// Delete the strokes in the InkCollector.
theInkCollector.Ink.DeleteStrokes();
// Force the form to repaint.
Refresh();
}
private void menuExit_Click(object sender, System.EventArgs e)
{
this.Close();
}
// Event handler for the Click event for subitems of the Display menu.
private void menuDisplayItem_Click(object sender, System.EventArgs e)
{
// Check each subitem to see if it was clicked.
foreach (System.Windows.Forms.MenuItem menu in menuDisplay.MenuItems)
{
if (sender == menu)
{
// Toggle the menu item's checked property.
menu.Checked = !menu.Checked;
}
}
// Force the form to repaint.
this.Refresh();
}
// Event handler for the form's Paint event.
private void Form1_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
{
Graphics g = e.Graphics;
// Highlight specific points or cusps of each stroke.
Strokes theStrokes = theInkCollector.Ink.Strokes;
foreach (Stroke theStroke in theStrokes)
{
// Convert the stroke's points and Bezier points from ink space to pixel coordinates.
Point [] ptBezierPoints = theStroke.BezierPoints;
Point [] ptStrokePoints = theStroke.GetPoints();
theInkCollector.Renderer.InkSpaceToPixel(g, ref ptBezierPoints);
theInkCollector.Renderer.InkSpaceToPixel(g, ref ptStrokePoints);
// If all points is checked, highlight the points of the stroke.
if (menuAllPoints.Checked)
{
foreach (Point pt in ptStrokePoints)
{
// draw a little diagonal line from each point
g.DrawEllipse(Pens.Magenta, pt.X-2, pt.Y-2, 4, 4);
}
}
// If polyline cusps is checked, highlight the cusps of the stroke.
if (menuPolylineCusps.Checked)
{
int[] theCusps = theStroke.PolylineCusps;
foreach (int i in theCusps)
{
// Draw a little rectangle around each polyline cusp.
g.DrawEllipse(Pens.BlueViolet, ptStrokePoints[i].X - 3, ptStrokePoints[i].Y - 3, 6, 6);
}
}
// If Bezier points is checked, highlight the Bezier points of the stroke.
if (menuBezierPoints.Checked)
{
foreach (Point pt in ptBezierPoints)
{
// Draw a little diagonal line from each Bezier point.
g.DrawEllipse(Pens.Goldenrod, pt.X-4, pt.Y-4, 8, 8);
}
}
// If Bezier cusps is checked, highlight the Bezier cusps of the stroke.
if (menuBezierCusps.Checked)
{
int [] theCusps = theStroke.BezierCusps;
foreach (int i in theCusps)
{
// Draw a little rectangle around each Bezier cusp.
g.DrawEllipse(Pens.Blue,
ptBezierPoints[i].X-5, ptBezierPoints[i].Y-5, 10, 10);
}
}
// If self intersections is checked, highlight the self intersections of the stroke.
if (menuSelfIntersections.Checked)
{
float [] theSelfIntersectionLocationsArray = theStroke.SelfIntersections;
foreach (float f in theSelfIntersectionLocationsArray)
{
Point pt = LocatePoint(theStroke, f);
theInkCollector.Renderer.InkSpaceToPixel(g, ref pt);
// Draw a little circle around each intersection.
g.DrawEllipse(Pens.Red, pt.X-7, pt.Y-7, 14, 14);
}
}
}
}
// This function returns the approximate point along
// a stroke represented by a float, as a Point.
private Point LocatePoint(Stroke theStroke, float theFIndex)
{
// Get the two nearest points to the point of interest.
Point [] ptStrokePoints = theStroke.GetPoints((int)Math.Floor(theFIndex), 2);
// Get fractional part to interpolate the distance between the points.
float theFraction = theFIndex - (float)Math.Floor(theFIndex);
int deltaX = (int)((ptStrokePoints[1].X - ptStrokePoints[0].X) * theFraction);
int deltaY = (int)((ptStrokePoints[1].Y - ptStrokePoints[0].Y) * theFraction);
// Return the interpolated point.
return new Point(ptStrokePoints[0].X + deltaX, ptStrokePoints[0].Y + deltaY);
}
In questo esempio di Microsoft Visual Basic .NET vengono illustrati diversi tipi di informazioni registrate con ogni oggetto Stroke. Nel programma chiamante vengono utilizzate voci di menu per attivare o disattivare la visualizzazione di punti, cuspidi di polilinea, punti e cuspidi di Bézier e autointersezioni di ogni tratto. Il metodo InkSpaceToPixel dell'oggetto Renderer viene utilizzato per convertire i punti per la visualizzazione. Il metodo LocatePoint viene utilizzato per interpolare le posizioni delle autointersezioni.
Dim WithEvents theInkCollector As Microsoft.Ink.InkCollector
' Event handler for the form's Load event.
Private Sub Form1_Load(ByVal sender As System.Object, _
ByVal e As System.EventArgs) Handles MyBase.Load
' Create and enable the InkCollector
theInkCollector = New Microsoft.Ink.InkCollector(Me.Handle)
theInkCollector.Enabled = True
' Associate the Click event handler with subitems of the Display menu.
AddHandler menuAllPoints.Click, AddressOf menuDisplayItem_Click
AddHandler menuPolylineCusps.Click, AddressOf menuDisplayItem_Click
AddHandler menuBezierPoints.Click, AddressOf menuDisplayItem_Click
AddHandler menuBezierCusps.Click, AddressOf menuDisplayItem_Click
AddHandler menuSelfIntersections.Click, AddressOf menuDisplayItem_Click
End Sub
' Event handler for the InkCollector's Stroke event.
Private Sub theInkCollector_Stroke(ByVal sender As Object, _
ByVal e As Microsoft.Ink.InkCollectorStrokeEventArgs) Handles theInkCollector.Stroke
' Force the form to repaint.
Me.Refresh()
End Sub
' Event handler for the Clear menu's Click event.
Private Sub menuClear_Click(ByVal sender As Object, _
ByVal e As System.EventArgs) Handles menuClear.Click
' Delete the strokes in the InkCollector.
theInkCollector.Ink.DeleteStrokes()
' Force the form to repaint.
Me.Refresh()
End Sub
' Event handler for the Click event for subitems of the Display menu.
Private Sub menuDisplayItem_Click(ByVal sender As Object, _
ByVal e As System.EventArgs)
' Check each subitem to see if it was clicked.
For Each menu As System.Windows.Forms.MenuItem In menuDisplay.MenuItems
If (sender Is menu) Then
' Toggle the menu item's checked property.
menu.Checked = Not menu.Checked
End If
Next
' Force the form to repaint.
Me.Refresh()
End Sub
' Event handler for the form's Paint event.
Private Sub Form1_Paint(ByVal sender As Object, _
ByVal e As System.Windows.Forms.PaintEventArgs) Handles MyBase.Paint
Dim g As Graphics = e.Graphics
' Highlight specific points or cusps of each stroke.
Dim theStrokes As Microsoft.Ink.Strokes = theInkCollector.Ink.Strokes
For Each theStroke As Microsoft.Ink.Stroke In theStrokes
' Convert the stroke's points and Bezier points from ink space to pixel coordinates.
Dim ptBezierPoints() As Point = theStroke.BezierPoints
Dim ptStrokePoints() As Point = theStroke.GetPoints()
theInkCollector.Renderer.InkSpaceToPixel(g, ptBezierPoints)
theInkCollector.Renderer.InkSpaceToPixel(g, ptStrokePoints)
' If all points is checked, highlight the points of the stroke.
If (menuAllPoints.Checked) Then
For Each pt As Point In ptStrokePoints
' draw a little diagonal line from each point
g.DrawEllipse(Pens.Magenta, pt.X - 2, pt.Y - 2, 4, 4)
Next
End If
' If polyline cusps is checked, highlight the cusps of the stroke.
If (menuPolylineCusps.Checked) Then
Dim theCusps() As Integer = theStroke.PolylineCusps
For Each i As Integer In theCusps
' Draw a little rectangle around each polyline cusp.
g.DrawEllipse(Pens.BlueViolet, ptStrokePoints(i).X - 3, ptStrokePoints(i).Y - 3, 6, 6)
Next
End If
' If Bezier points is checked, highlight the Bezier points of the stroke.
If (menuBezierPoints.Checked) Then
For Each pt As Point In ptBezierPoints
' Draw a little diagonal line from each Bezier point.
g.DrawEllipse(Pens.Goldenrod, pt.X - 4, pt.Y - 4, 8, 8)
Next
End If
' If Bezier cusps is checked, highlight the Bezier cusps of the stroke.
If (menuBezierCusps.Checked) Then
Dim theCusps() As Integer = theStroke.BezierCusps
For Each i As Integer In theCusps
' Draw a little rectangle around each Bezier cusp.
g.DrawEllipse(Pens.Blue, ptBezierPoints(i).X - 5, ptBezierPoints(i).Y - 5, 10, 10)
Next
End If
' If self intersections is checked, highlight the self intersections of the stroke.
If (menuSelfIntersections.Checked) Then
Dim theSelfIntersectionLocationsArray() As Single = theStroke.SelfIntersections
For Each f As Single In theSelfIntersectionLocationsArray
Dim pt As Point = LocatePoint(theStroke, f)
theInkCollector.Renderer.InkSpaceToPixel(g, pt)
' Draw a little circle around each intersection.
g.DrawEllipse(Pens.Red, pt.X - 7, pt.Y - 7, 14, 14)
Next
End If
Next
End Sub
' This function returns the approximate point along
' a stroke represented by a float, as a Point.
Private Function LocatePoint(ByVal theStroke As Microsoft.Ink.Stroke, _
ByVal theFIndex As Single) As Point
' Get the two nearest points to the point of interest.
Dim ptStrokePoints() As Point = theStroke.GetPoints(Math.Floor(theFIndex), 2)
' Get fractional part to interpolate the distance between the points.
Dim theFraction As Single = theFIndex - Math.Floor(theFIndex)
Dim deltaX As Integer = (ptStrokePoints(1).X - ptStrokePoints(0).X) * theFraction
Dim deltaY As Integer = (ptStrokePoints(1).Y - ptStrokePoints(0).Y) * theFraction
' Return the interpolated point.
LocatePoint = New Point(ptStrokePoints(0).X + deltaX, ptStrokePoints(0).Y + deltaY)
End Function
Piattaforme
Windows Vista
.NET Framework e .NET Compact Framework non supportano tutte le versioni di ciascuna piattaforma. Per un elenco delle versioni supportate, vedere Requisiti di sistema di .NET Framework.
Informazioni sulla versione
.NET Framework
Supportato in: 3.0