Stroke.BezierCusps (Propiedad)
Actualización: noviembre 2007
Obtiene una matriz que contiene los índices de las cúspides de la aproximación de Bézier del objeto Stroke.
Espacio de nombres: Microsoft.Ink
Ensamblado: Microsoft.Ink (en Microsoft.Ink.dll)
Sintaxis
'Declaración
Public ReadOnly Property BezierCusps As Integer()
'Uso
Dim instance As Stroke
Dim value As Integer()
value = instance.BezierCusps
public int[] BezierCusps { get; }
public:
property array<int>^ BezierCusps {
array<int>^ get ();
}
/** @property */
public int[] get_BezierCusps()
public function get BezierCusps () : int[]
Valor de propiedad
Tipo: array<System.Int32[]
Matriz Array de los índices de los puntos que son las cúspides de la aproximación de Bézier del objeto Stroke.
Comentarios
La matriz que devuelve la propiedad BezierCusps es un subconjunto de la matriz que devuelve la propiedad BezierPoints. Cada índice en la propiedad BezierCusps se corresponde con un punto en la matriz que devuelve la propiedad BezierPoints que es una cúspide de los puntos de control de Bézier para el trazo.
Una cúspide es un punto en el trazo donde la dirección de la escritura cambia de un modo discontinuo. Por ejemplo, si el trazo representa la letra mayúscula "L", esta propiedad devuelve tres cúspides: dos que corresponden a los puntos de control primero y último del trazo, y el tercero que representa la esquina de la "L".
La ubicación de una cúspide de Bézier se puede determinar usando la cúspide como un índice en la matriz que devuelve la propiedad BezierPoints.
Ejemplos
En este ejemplo de C# se muestran los diferentes tipos de información que se registran con cada objeto Stroke. El programa que realiza la llamada usa elementos de menú para alternar la presentación de los puntos del trazo, los vértices de polilíneas, los puntos Bézier, los vértices Bézier y las autointersecciones. El método InkSpaceToPixel del objeto Renderer se usa con el fin de convertir los puntos para su presentación. El método LocatePoint se usa para interpolar las ubicaciones de las autointersecciones.
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);
}
En este ejemplo de Microsoft Visual Basic .NET se muestran los diferentes tipos de información que se registran con cada objeto Stroke. El programa que realiza la llamada usa elementos de menú para alternar la presentación de los puntos del trazo, los vértices de polilíneas, los puntos Bézier, los vértices Bézier y las autointersecciones. El método InkSpaceToPixel del objeto Renderer se usa con el fin de convertir los puntos para su presentación. El método LocatePoint se usa para interpolar las ubicaciones de las autointersecciones.
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
Plataformas
Windows Vista
.NET Framework y .NET Compact Framework no admiten todas las versiones de cada plataforma. Para obtener una lista de las versiones compatibles, vea Requisitos de sistema de .NET Framework.
Información de versión
.NET Framework
Compatible con: 3.0