Graphics.IsVisible Método

Definición

Indica si el punto especificado por un par de coordenadas se halla contenido en la región de recorte visible de este Graphics.Indicates whether the point specified by a pair of coordinates is contained within the visible clip region of this Graphics.

Sobrecargas

IsVisible(Point)

Indica si la estructura Point especificada está dentro de la región de recorte visible de este Graphics.Indicates whether the specified Point structure is contained within the visible clip region of this Graphics.

IsVisible(PointF)

Indica si la estructura PointF especificada está dentro de la región de recorte visible de este Graphics.Indicates whether the specified PointF structure is contained within the visible clip region of this Graphics.

IsVisible(Rectangle)

Indica si el rectángulo especificado por una estructura Rectangle está dentro de la región de recorte visible de este Graphics.Indicates whether the rectangle specified by a Rectangle structure is contained within the visible clip region of this Graphics.

IsVisible(RectangleF)

Indica si el rectángulo especificado por una estructura RectangleF está dentro de la región de recorte visible de este Graphics.Indicates whether the rectangle specified by a RectangleF structure is contained within the visible clip region of this Graphics.

IsVisible(Int32, Int32)

Indica si el punto especificado por un par de coordenadas se halla contenido en la región de recorte visible de este Graphics.Indicates whether the point specified by a pair of coordinates is contained within the visible clip region of this Graphics.

IsVisible(Single, Single)

Indica si el punto especificado por un par de coordenadas se halla contenido en la región de recorte visible de este Graphics.Indicates whether the point specified by a pair of coordinates is contained within the visible clip region of this Graphics.

IsVisible(Int32, Int32, Int32, Int32)

Indica si el rectángulo especificado por un par de coordenadas, un valor de ancho y un valor de alto se halla contenido en la región de recorte visible de este Graphics.Indicates whether the rectangle specified by a pair of coordinates, a width, and a height is contained within the visible clip region of this Graphics.

IsVisible(Single, Single, Single, Single)

Indica si el rectángulo especificado por un par de coordenadas, un valor de ancho y un valor de alto se halla contenido en la región de recorte visible de este Graphics.Indicates whether the rectangle specified by a pair of coordinates, a width, and a height is contained within the visible clip region of this Graphics.

IsVisible(Point)

Indica si la estructura Point especificada está dentro de la región de recorte visible de este Graphics.Indicates whether the specified Point structure is contained within the visible clip region of this Graphics.

public:
 bool IsVisible(System::Drawing::Point point);
public bool IsVisible (System.Drawing.Point point);
member this.IsVisible : System.Drawing.Point -> bool

Parámetros

point
Point

Estructura Point cuya visibilidad se va a comprobar.Point structure to test for visibility.

Devoluciones

true si el punto especificado por el parámetro point está dentro de la región de recorte visible de este Graphics; de lo contrario, false.true if the point specified by the point parameter is contained within the visible clip region of this Graphics; otherwise, false.

Ejemplos

El siguiente ejemplo de código está diseñado para su uso con Windows Forms y requiere PaintEventArgs e, que Paint es un parámetro del controlador de eventos.The following code example is designed for use with Windows Forms, and it requires PaintEventArgse, which is a parameter of the Paint event handler. El código realiza las siguientes acciones:The code performs the following actions:

  • Crea una región de recorte rectangular y la establece como la región de recorte para el objeto gráfico Replacedel formulario mediante.Creates a rectangular clipping region and sets it as the clipping region for the graphics object of the form using Replace.

  • Crea dos puntos, uno dentro de la región de recorte y otro fuera.Creates two points, one inside the clipping region and one outside.

  • Comprueba cada uno de los puntos para ver su visibilidad y dibuja solo el visible.Tests each of the points for visibility and draws only the visible one.

El resultado es un pequeño círculo rojo, que está dentro de la región de recorte.The result is one small red circle, which is within the clip region.

public:
   void IsVisiblePoint( PaintEventArgs^ e )
   {
      // Set clip region.
      System::Drawing::Region^ clipRegion = gcnew System::Drawing::Region( Rectangle(50,50,100,100) );
      e->Graphics->SetClip( clipRegion, CombineMode::Replace );

      // Set up coordinates of points.
      int x1 = 100;
      int y1 = 100;
      int x2 = 200;
      int y2 = 200;
      Point point1 = Point(x1,y1);
      Point point2 = Point(x2,y2);

      // If point is visible, fill ellipse that represents it.
      if ( e->Graphics->IsVisible( point1 ) )
      {
         e->Graphics->FillEllipse( gcnew SolidBrush( Color::Red ), x1, y1, 10, 10 );
      }

      if ( e->Graphics->IsVisible( point2 ) )
      {
         e->Graphics->FillEllipse( gcnew SolidBrush( Color::Blue ), x2, y2, 10, 10 );
      }
   }
private void IsVisiblePoint(PaintEventArgs e)
{

    // Set clip region.
    Region clipRegion = new Region(new Rectangle(50, 50, 100, 100));
    e.Graphics.SetClip(clipRegion, CombineMode.Replace);

    // Set up coordinates of points.
    int x1 = 100;
    int y1 = 100;
    int x2 = 200;
    int y2 = 200;
    Point point1 = new Point(x1, y1);
    Point point2 = new Point(x2, y2);

    // If point is visible, fill ellipse that represents it.
    if (e.Graphics.IsVisible(point1))
    {
        e.Graphics.FillEllipse(new SolidBrush(Color.Red), x1, y1, 10, 10);
    }
    if (e.Graphics.IsVisible(point2))
    {
        e.Graphics.FillEllipse(new SolidBrush(Color.Blue), x2, y2, 10, 10);
    }
}
Private Sub IsVisiblePoint(ByVal e As PaintEventArgs)

    ' Set clip region.
    Dim clipRegion As New [Region](New Rectangle(50, 50, 100, 100))
    e.Graphics.SetClip(clipRegion, CombineMode.Replace)

    ' Set up coordinates of points.
    Dim x1 As Integer = 100
    Dim y1 As Integer = 100
    Dim x2 As Integer = 200
    Dim y2 As Integer = 200
    Dim point1 As New Point(x1, y1)
    Dim point2 As New Point(x2, y2)

    ' If point is visible, fill ellipse that represents it.
    If e.Graphics.IsVisible(point1) Then
        e.Graphics.FillEllipse(New SolidBrush(Color.Red), x1, y1, _
        10, 10)
    End If
    If e.Graphics.IsVisible(point2) Then
        e.Graphics.FillEllipse(New SolidBrush(Color.Blue), x2, y2, _
        10, 10)
    End If
End Sub

IsVisible(PointF)

Indica si la estructura PointF especificada está dentro de la región de recorte visible de este Graphics.Indicates whether the specified PointF structure is contained within the visible clip region of this Graphics.

public:
 bool IsVisible(System::Drawing::PointF point);
public bool IsVisible (System.Drawing.PointF point);
member this.IsVisible : System.Drawing.PointF -> bool
Public Function IsVisible (point As PointF) As Boolean

Parámetros

point
PointF

Estructura PointF cuya visibilidad se va a comprobar.PointF structure to test for visibility.

Devoluciones

true si el punto especificado por el parámetro point está dentro de la región de recorte visible de este Graphics; de lo contrario, false.true if the point specified by the point parameter is contained within the visible clip region of this Graphics; otherwise, false.

Ejemplos

El siguiente ejemplo de código está diseñado para su uso con Windows Forms y requiere PaintEventArgs e, que Paint es un parámetro del controlador de eventos.The following code example is designed for use with Windows Forms, and it requires PaintEventArgse, which is a parameter of the Paint event handler. El código realiza las siguientes acciones:The code performs the following actions:

  • Crea una región de recorte rectangular y la establece como la región de recorte para los gráficos Replacedel formulario mediante.Creates a rectangular clipping region and sets it as the clipping region for the graphics of the form using Replace.

  • Crea dos puntos, uno dentro de la región de recorte y otro fuera.Creates two points, one inside the clipping region and one outside.

  • Comprueba cada uno de los puntos para ver su visibilidad y dibuja solo el visible.Tests each of the points for visibility and draws only the visible one.

El resultado es un pequeño círculo rojo, que está dentro de la región de recorte.The result is one small red circle, which is within the clip region.

public:
   void IsVisiblePointF( PaintEventArgs^ e )
   {
      // Set clip region.
      System::Drawing::Region^ clipRegion = gcnew System::Drawing::Region( Rectangle(50,50,100,100) );
      e->Graphics->SetClip( clipRegion, CombineMode::Replace );

      // Set up coordinates of points.
      float x1 = 100.0F;
      float y1 = 100.0F;
      float x2 = 200.0F;
      float y2 = 200.0F;
      PointF point1 = PointF(x1,y1);
      PointF point2 = PointF(x2,y2);

      // If point is visible, fill ellipse that represents it.
      if ( e->Graphics->IsVisible( point1 ) )
      {
         e->Graphics->FillEllipse( gcnew SolidBrush( Color::Red ), x1, y1, 10.0F, 10.0F );
      }

      if ( e->Graphics->IsVisible( point2 ) )
      {
         e->Graphics->FillEllipse( gcnew SolidBrush( Color::Blue ), x2, y2, 10.0F, 10.0F );
      }
   }
private void IsVisiblePointF(PaintEventArgs e)
{

    // Set clip region.
    Region clipRegion = new Region(new Rectangle(50, 50, 100, 100));
    e.Graphics.SetClip(clipRegion, CombineMode.Replace);

    // Set up coordinates of points.
    float x1 = 100.0F;
    float y1 = 100.0F;
    float x2 = 200.0F;
    float y2 = 200.0F;
    PointF point1 = new PointF(x1, y1);
    PointF point2 = new PointF(x2, y2);

    // If point is visible, fill ellipse that represents it.
    if (e.Graphics.IsVisible(point1))
    {
        e.Graphics.FillEllipse(new SolidBrush(Color.Red), x1, y1, 10.0F, 10.0F);
    }
    if (e.Graphics.IsVisible(point2))
    {
        e.Graphics.FillEllipse(new SolidBrush(Color.Blue), x2, y2, 10.0F, 10.0F);
    }
}
Private Sub IsVisiblePointF(ByVal e As PaintEventArgs)

    ' Set clip region.
    Dim clipRegion As New [Region](New Rectangle(50, 50, 100, 100))
    e.Graphics.SetClip(clipRegion, CombineMode.Replace)

    ' Set up coordinates of points.
    Dim x1 As Single = 100.0F
    Dim y1 As Single = 100.0F
    Dim x2 As Single = 200.0F
    Dim y2 As Single = 200.0F
    Dim point1 As New PointF(x1, y1)
    Dim point2 As New PointF(x2, y2)

    ' If point is visible, fill ellipse that represents it.
    If e.Graphics.IsVisible(point1) Then
        e.Graphics.FillEllipse(New SolidBrush(Color.Red), x1, y1, _
        10.0F, 10.0F)
    End If
    If e.Graphics.IsVisible(point2) Then
        e.Graphics.FillEllipse(New SolidBrush(Color.Blue), x2, y2, _
        10.0F, 10.0F)
    End If
End Sub

IsVisible(Rectangle)

Indica si el rectángulo especificado por una estructura Rectangle está dentro de la región de recorte visible de este Graphics.Indicates whether the rectangle specified by a Rectangle structure is contained within the visible clip region of this Graphics.

public:
 bool IsVisible(System::Drawing::Rectangle rect);
public bool IsVisible (System.Drawing.Rectangle rect);
member this.IsVisible : System.Drawing.Rectangle -> bool
Public Function IsVisible (rect As Rectangle) As Boolean

Parámetros

rect
Rectangle

Estructura Rectangle cuya visibilidad se va a comprobar.Rectangle structure to test for visibility.

Devoluciones

true si el rectángulo especificado por el parámetro rect está dentro de la región de recorte visible de este Graphics; de lo contrario, false.true if the rectangle specified by the rect parameter is contained within the visible clip region of this Graphics; otherwise, false.

Ejemplos

El siguiente ejemplo de código está diseñado para su uso con Windows Forms y requiere PaintEventArgs e, que Paint es un parámetro del controlador de eventos.The following code example is designed for use with Windows Forms, and it requires PaintEventArgse, which is a parameter of the Paint event handler. El código realiza las siguientes acciones:The code performs the following actions:

  • Crea una región de recorte rectangular y la establece como la región de recorte para el objeto gráfico Replacedel formulario mediante.Creates a rectangular clipping region and sets it as the clipping region for the graphics object of the form using Replace.

  • Crea la ubicación y el tamaño de dos rectángulos, uno dentro de la región de recorte y otro fuera.Creates the location and size of two rectangles, one inside the clipping region and one outside.

  • Comprueba cada uno de los rectángulos para ver su visibilidad y dibuja solo el visible.Tests each of the rectangles for visibility and draws only the visible one.

El resultado es un pequeño rectángulo rojo, que está dentro de la región de recorte.The result is one small red rectangle, which is within the clip region.

public:
   void IsVisibleRectangle( PaintEventArgs^ e )
   {
      // Set clip region.
      System::Drawing::Region^ clipRegion = gcnew System::Drawing::Region( Rectangle(50,50,100,100) );
      e->Graphics->SetClip( clipRegion, CombineMode::Replace );

      // Set up coordinates of rectangles.
      Rectangle rect1 = Rectangle(100,100,20,20);
      Rectangle rect2 = Rectangle(200,200,20,20);

      // If rectangle is visible, fill it.
      if ( e->Graphics->IsVisible( rect1 ) )
      {
         e->Graphics->FillRectangle( gcnew SolidBrush( Color::Red ), rect1 );
      }

      if ( e->Graphics->IsVisible( rect2 ) )
      {
         e->Graphics->FillRectangle( gcnew SolidBrush( Color::Blue ), rect2 );
      }
   }
private void IsVisibleRectangle(PaintEventArgs e)
{

    // Set clip region.
    Region clipRegion = new Region(new Rectangle(50, 50, 100, 100));
    e.Graphics.SetClip(clipRegion, CombineMode.Replace);

    // Set up coordinates of rectangles.
    Rectangle rect1 = new Rectangle(100, 100, 20, 20);
    Rectangle rect2 = new Rectangle(200, 200, 20, 20);

    // If rectangle is visible, fill it.
    if (e.Graphics.IsVisible(rect1))
    {
        e.Graphics.FillRectangle(new SolidBrush(Color.Red), rect1);
    }
    if (e.Graphics.IsVisible(rect2))
    {
        e.Graphics.FillRectangle(new SolidBrush(Color.Blue), rect2);
    }
}
Private Sub IsVisibleRectangle(ByVal e As PaintEventArgs)

    ' Set clip region.
    Dim clipRegion As New [Region](New Rectangle(50, 50, 100, 100))
    e.Graphics.SetClip(clipRegion, CombineMode.Replace)

    ' Set up coordinates of rectangles.
    Dim rect1 As New Rectangle(100, 100, 20, 20)
    Dim rect2 As New Rectangle(200, 200, 20, 20)

    ' If rectangle is visible, fill it.
    If e.Graphics.IsVisible(rect1) Then
        e.Graphics.FillRectangle(New SolidBrush(Color.Red), rect1)
    End If
    If e.Graphics.IsVisible(rect2) Then
        e.Graphics.FillRectangle(New SolidBrush(Color.Blue), rect2)
    End If
End Sub

IsVisible(RectangleF)

Indica si el rectángulo especificado por una estructura RectangleF está dentro de la región de recorte visible de este Graphics.Indicates whether the rectangle specified by a RectangleF structure is contained within the visible clip region of this Graphics.

public:
 bool IsVisible(System::Drawing::RectangleF rect);
public bool IsVisible (System.Drawing.RectangleF rect);
member this.IsVisible : System.Drawing.RectangleF -> bool
Public Function IsVisible (rect As RectangleF) As Boolean

Parámetros

rect
RectangleF

Estructura RectangleF cuya visibilidad se va a comprobar.RectangleF structure to test for visibility.

Devoluciones

true si el rectángulo especificado por el parámetro rect está dentro de la región de recorte visible de este Graphics; de lo contrario, false.true if the rectangle specified by the rect parameter is contained within the visible clip region of this Graphics; otherwise, false.

Ejemplos

El siguiente ejemplo de código está diseñado para su uso con Windows Forms y requiere PaintEventArgs e, que Paint es un parámetro del controlador de eventos.The following code example is designed for use with Windows Forms, and it requires PaintEventArgse, which is a parameter of the Paint event handler. El código realiza las siguientes acciones:The code performs the following actions:

  • Crea una región de recorte rectangular y la establece como la región de recorte para el objeto gráfico Replacedel formulario mediante.Creates a rectangular clipping region and sets it as the clipping region for the graphics object of the form using Replace.

  • Crea dos rectángulos, uno dentro de la región de recorte y otro fuera.Creates two rectangles, one inside the clipping region and one outside.

  • Comprueba cada uno de los rectángulos para ver su visibilidad y dibuja solo el visible.Tests each of the rectangles for visibility and draws only the visible one.

El resultado es un pequeño rectángulo rojo, que está dentro de la región de recorte.The result is one small red rectangle, which is within the clip region.

public:
   void IsVisibleRectangleF( PaintEventArgs^ e )
   {
      // Set clip region.
      System::Drawing::Region^ clipRegion = gcnew System::Drawing::Region( Rectangle(50,50,100,100) );
      e->Graphics->SetClip( clipRegion, CombineMode::Replace );

      // Set up coordinates of rectangles.
      RectangleF rect1 = RectangleF(100.0F,100.0F,20.0F,20.0F);
      RectangleF rect2 = RectangleF(200.0F,200.0F,20.0F,20.0F);

      // If rectangle is visible, fill it.
      if ( e->Graphics->IsVisible( rect1 ) )
      {
         e->Graphics->FillRectangle( gcnew SolidBrush( Color::Red ), rect1 );
      }

      if ( e->Graphics->IsVisible( rect2 ) )
      {
         e->Graphics->FillRectangle( gcnew SolidBrush( Color::Blue ), rect2 );
      }
   }
private void IsVisibleRectangleF(PaintEventArgs e)
{

    // Set clip region.
    Region clipRegion = new Region(new Rectangle(50, 50, 100, 100));
    e.Graphics.SetClip(clipRegion, CombineMode.Replace);

    // Set up coordinates of rectangles.
    RectangleF rect1 = new RectangleF(100.0F, 100.0F, 20.0F, 20.0F);
    RectangleF rect2 = new RectangleF(200.0F, 200.0F, 20.0F, 20.0F);

    // If rectangle is visible, fill it.
    if (e.Graphics.IsVisible(rect1))
    {
        e.Graphics.FillRectangle(new SolidBrush(Color.Red), rect1);
    }
    if (e.Graphics.IsVisible(rect2))
    {
        e.Graphics.FillRectangle(new SolidBrush(Color.Blue), rect2);
    }
}
Private Sub IsVisibleRectangleF(ByVal e As PaintEventArgs)

    ' Set clip region.
    Dim clipRegion As New [Region](New Rectangle(50, 50, 100, 100))
    e.Graphics.SetClip(clipRegion, CombineMode.Replace)

    ' Set up coordinates of rectangles.
    Dim rect1 As New RectangleF(100.0F, 100.0F, 20.0F, 20.0F)
    Dim rect2 As New RectangleF(200.0F, 200.0F, 20.0F, 20.0F)

    ' If rectangle is visible, fill it.
    If e.Graphics.IsVisible(rect1) Then
        e.Graphics.FillRectangle(New SolidBrush(Color.Red), rect1)
    End If
    If e.Graphics.IsVisible(rect2) Then
        e.Graphics.FillRectangle(New SolidBrush(Color.Blue), rect2)
    End If
End Sub

IsVisible(Int32, Int32)

Indica si el punto especificado por un par de coordenadas se halla contenido en la región de recorte visible de este Graphics.Indicates whether the point specified by a pair of coordinates is contained within the visible clip region of this Graphics.

public:
 bool IsVisible(int x, int y);
public bool IsVisible (int x, int y);
member this.IsVisible : int * int -> bool
Public Function IsVisible (x As Integer, y As Integer) As Boolean

Parámetros

x
Int32

Coordenada x del punto cuya visibilidad se va a comprobar.The x-coordinate of the point to test for visibility.

y
Int32

Coordenada y del punto cuya visibilidad se va a comprobar.The y-coordinate of the point to test for visibility.

Devoluciones

true si el punto definido por los parámetros x e y está dentro de la región de recorte visible de este Graphics; de lo contrario, false.true if the point defined by the x and y parameters is contained within the visible clip region of this Graphics; otherwise, false.

Ejemplos

El siguiente ejemplo de código está diseñado para su uso con Windows Forms y requiere PaintEventArgs e, que Paint es un parámetro del controlador de eventos.The following code example is designed for use with Windows Forms, and it requires PaintEventArgse, which is a parameter of the Paint event handler. El código realiza las siguientes acciones:The code performs the following actions:

  • Crea una región de recorte rectangular y la establece como la región de recorte para el objeto gráfico Replacedel formulario mediante.Creates a rectangular clipping region and sets it as the clipping region for the graphics object of the form using Replace.

  • Crea dos puntos, uno dentro de la región de recorte y otro fuera.Creates two points, one inside the clipping region and one outside.

  • Comprueba cada uno de los puntos para ver su visibilidad y dibuja solo el visible.Tests each of the points for visibility and draws only the visible one.

El resultado es un pequeño círculo rojo, que está dentro de la región de recorte.The result is one small red circle, which is within the clip region.

public:
   void IsVisibleInt( PaintEventArgs^ e )
   {
      // Set clip region.
      System::Drawing::Region^ clipRegion = gcnew System::Drawing::Region( Rectangle(50,50,100,100) );
      e->Graphics->SetClip( clipRegion, CombineMode::Replace );

      // Set up coordinates of points.
      int x1 = 100;
      int y1 = 100;
      int x2 = 200;
      int y2 = 200;

      // If point is visible, fill ellipse that represents it.
      if ( e->Graphics->IsVisible( x1, y1 ) )
      {
         e->Graphics->FillEllipse( gcnew SolidBrush( Color::Red ), x1, y1, 10, 10 );
      }

      if ( e->Graphics->IsVisible( x2, y2 ) )
      {
         e->Graphics->FillEllipse( gcnew SolidBrush( Color::Blue ), x2, y2, 10, 10 );
      }
   }
private void IsVisibleInt(PaintEventArgs e)
{

    // Set clip region.
    Region clipRegion = new Region(new Rectangle(50, 50, 100, 100));
    e.Graphics.SetClip(clipRegion, CombineMode.Replace);

    // Set up coordinates of points.
    int x1 = 100;
    int y1 = 100;
    int x2 = 200;
    int y2 = 200;

    // If point is visible, fill ellipse that represents it.
    if (e.Graphics.IsVisible(x1, y1))
    {
        e.Graphics.FillEllipse(new SolidBrush(Color.Red), x1, y1, 10, 10);
    }
    if (e.Graphics.IsVisible(x2, y2))
    {
        e.Graphics.FillEllipse(new SolidBrush(Color.Blue), x2, y2, 10, 10);
    }
}
Private Sub IsVisibleInt(ByVal e As PaintEventArgs)

    ' Set clip region.
    Dim clipRegion As New [Region](New Rectangle(50, 50, 100, 100))
    e.Graphics.SetClip(clipRegion, CombineMode.Replace)

    ' Set up coordinates of points.
    Dim x1 As Integer = 100
    Dim y1 As Integer = 100
    Dim x2 As Integer = 200
    Dim y2 As Integer = 200

    ' If point is visible, fill ellipse that represents it.
    If e.Graphics.IsVisible(x1, y1) Then
        e.Graphics.FillEllipse(New SolidBrush(Color.Red), x1, y1, _
        10, 10)
    End If
    If e.Graphics.IsVisible(x2, y2) Then
        e.Graphics.FillEllipse(New SolidBrush(Color.Blue), x2, y2, _
        10, 10)
    End If
End Sub

IsVisible(Single, Single)

Indica si el punto especificado por un par de coordenadas se halla contenido en la región de recorte visible de este Graphics.Indicates whether the point specified by a pair of coordinates is contained within the visible clip region of this Graphics.

public:
 bool IsVisible(float x, float y);
public bool IsVisible (float x, float y);
member this.IsVisible : single * single -> bool
Public Function IsVisible (x As Single, y As Single) As Boolean

Parámetros

x
Single

Coordenada x del punto cuya visibilidad se va a comprobar.The x-coordinate of the point to test for visibility.

y
Single

Coordenada y del punto cuya visibilidad se va a comprobar.The y-coordinate of the point to test for visibility.

Devoluciones

true si el punto definido por los parámetros x e y está dentro de la región de recorte visible de este Graphics; de lo contrario, false.true if the point defined by the x and y parameters is contained within the visible clip region of this Graphics; otherwise, false.

Ejemplos

El siguiente ejemplo de código está diseñado para su uso con Windows Forms y requiere PaintEventArgs e, que Paint es un parámetro del controlador de eventos.The following code example is designed for use with Windows Forms, and it requires PaintEventArgse, which is a parameter of the Paint event handler. El código realiza las siguientes acciones:The code performs the following actions:

  • Crea una región de recorte rectangular y la establece como la región de recorte para el objeto gráfico Replacedel formulario mediante.Creates a rectangular clipping region and sets it as the clipping region for the graphics object of the form using Replace.

  • Crea dos puntos, uno dentro de la región de recorte y otro fuera.Creates two points, one inside the clipping region and one outside.

  • Comprueba cada uno de los puntos para ver su visibilidad y dibuja solo el visible.Tests each of the points for visibility and draws only the visible one.

El resultado es un pequeño círculo rojo, que está dentro de la región de recorte.The result is one small red circle, which is within the clip region.

public:
   void IsVisibleFloat( PaintEventArgs^ e )
   {
      // Set clip region.
      System::Drawing::Region^ clipRegion = gcnew System::Drawing::Region( Rectangle(50,50,100,100) );
      e->Graphics->SetClip( clipRegion, CombineMode::Replace );

      // Set up coordinates of points.
      float x1 = 100.0F;
      float y1 = 100.0F;
      float x2 = 200.0F;
      float y2 = 200.0F;

      // If point is visible, fill ellipse that represents it.
      if ( e->Graphics->IsVisible( x1, y1 ) )
      {
         e->Graphics->FillEllipse( gcnew SolidBrush( Color::Red ), x1, y1, 10.0F, 10.0F );
      }

      if ( e->Graphics->IsVisible( x2, y2 ) )
      {
         e->Graphics->FillEllipse( gcnew SolidBrush( Color::Blue ), x2, y2, 10.0F, 10.0F );
      }
   }
private void IsVisibleFloat(PaintEventArgs e)
{

    // Set clip region.
    Region clipRegion = new Region(new Rectangle(50, 50, 100, 100));
    e.Graphics.SetClip(clipRegion, CombineMode.Replace);

    // Set up coordinates of points.
    float x1 = 100.0F;
    float y1 = 100.0F;
    float x2 = 200.0F;
    float y2 = 200.0F;

    // If point is visible, fill ellipse that represents it.
    if (e.Graphics.IsVisible(x1, y1))
    {
        e.Graphics.FillEllipse(new SolidBrush(Color.Red), x1, y1, 10.0F, 10.0F);
    }
    if (e.Graphics.IsVisible(x2, y2))
    {
        e.Graphics.FillEllipse(new SolidBrush(Color.Blue), x2, y2, 10.0F, 10.0F);
    }
}
Private Sub IsVisibleFloat(ByVal e As PaintEventArgs)

    ' Set clip region.
    Dim clipRegion As New [Region](New Rectangle(50, 50, 100, 100))
    e.Graphics.SetClip(clipRegion, CombineMode.Replace)

    ' Set up coordinates of points.
    Dim x1 As Single = 100.0F
    Dim y1 As Single = 100.0F
    Dim x2 As Single = 200.0F
    Dim y2 As Single = 200.0F

    ' If point is visible, fill ellipse that represents it.
    If e.Graphics.IsVisible(x1, y1) Then
        e.Graphics.FillEllipse(New SolidBrush(Color.Red), x1, y1, _
        10.0F, 10.0F)
    End If
    If e.Graphics.IsVisible(x2, y2) Then
        e.Graphics.FillEllipse(New SolidBrush(Color.Blue), x2, y2, _
        10.0F, 10.0F)
    End If
End Sub

IsVisible(Int32, Int32, Int32, Int32)

Indica si el rectángulo especificado por un par de coordenadas, un valor de ancho y un valor de alto se halla contenido en la región de recorte visible de este Graphics.Indicates whether the rectangle specified by a pair of coordinates, a width, and a height is contained within the visible clip region of this Graphics.

public:
 bool IsVisible(int x, int y, int width, int height);
public bool IsVisible (int x, int y, int width, int height);
member this.IsVisible : int * int * int * int -> bool
Public Function IsVisible (x As Integer, y As Integer, width As Integer, height As Integer) As Boolean

Parámetros

x
Int32

Coordenada x de la esquina superior izquierda del rectángulo cuya visibilidad se va a comprobar.The x-coordinate of the upper-left corner of the rectangle to test for visibility.

y
Int32

Coordenada y de la esquina superior izquierda del rectángulo cuya visibilidad se va a comprobar.The y-coordinate of the upper-left corner of the rectangle to test for visibility.

width
Int32

Ancho del rectángulo cuya visibilidad se va a comprobar.Width of the rectangle to test for visibility.

height
Int32

Alto del rectángulo cuya visibilidad se va a comprobar.Height of the rectangle to test for visibility.

Devoluciones

true si el rectángulo definido por los parámetros x, y, width y height está dentro de la región de recorte visible de este Graphics; de lo contrario, false.true if the rectangle defined by the x, y, width, and height parameters is contained within the visible clip region of this Graphics; otherwise, false.

Ejemplos

El siguiente ejemplo de código está diseñado para su uso con Windows Forms y requiere PaintEventArgs e, que Paint es un parámetro del controlador de eventos.The following code example is designed for use with Windows Forms, and it requires PaintEventArgse, which is a parameter of the Paint event handler. El código realiza las siguientes acciones:The code performs the following actions:

  • Crea una región de recorte rectangular y la establece como la región de recorte para el objeto gráfico Replacedel formulario mediante.Creates a rectangular clipping region and sets it as the clipping region for the graphics object of the form using Replace.

  • Crea la ubicación y el tamaño de dos rectángulos, uno dentro de la región de recorte y otro fuera.Creates the location and size of two rectangles, one inside the clipping region and one outside.

  • Comprueba cada uno de los rectángulos para ver su visibilidad y dibuja solo el visible.Tests each of the rectangles for visibility and draws only the visible one.

El resultado es un pequeño rectángulo rojo, que está dentro de la región de recorte.The result is one small red rectangle, which is within the clip region.

public:
   void IsVisible4Int( PaintEventArgs^ e )
   {
      // Set clip region.
      System::Drawing::Region^ clipRegion = gcnew System::Drawing::Region( Rectangle(50,50,100,100) );
      e->Graphics->SetClip( clipRegion, CombineMode::Replace );

      // Set up coordinates of rectangles.
      int x1 = 100;
      int y1 = 100;
      int width1 = 20;
      int height1 = 20;
      int x2 = 200;
      int y2 = 200;
      int width2 = 20;
      int height2 = 20;

      // If rectangle is visible, fill it.
      if ( e->Graphics->IsVisible( x1, y1, width1, height1 ) )
      {
         e->Graphics->FillRectangle( gcnew SolidBrush( Color::Red ), x1, y1, width1, height1 );
      }

      if ( e->Graphics->IsVisible( x2, y2, width2, height2 ) )
      {
         e->Graphics->FillRectangle( gcnew SolidBrush( Color::Blue ), x2, y2, width2, height2 );
      }
   }
private void IsVisible4Int(PaintEventArgs e)
{

    // Set clip region.
    Region clipRegion = new Region(new Rectangle(50, 50, 100, 100));
    e.Graphics.SetClip(clipRegion, CombineMode.Replace);

    // Set up coordinates of rectangles.
    int x1 = 100;
    int y1 = 100;
    int width1 = 20;
    int height1 = 20;
    int x2 = 200;
    int y2 = 200;
    int width2 = 20;
    int height2 = 20;

    // If rectangle is visible, fill it.
    if (e.Graphics.IsVisible(x1, y1, width1, height1))
    {
        e.Graphics.FillRectangle(new SolidBrush(Color.Red), x1, y1, width1, height1);
    }
    if (e.Graphics.IsVisible(x2, y2, width2, height2))
    {
        e.Graphics.FillRectangle(new SolidBrush(Color.Blue), x2, y2, width2, height2);
    }
}
Private Sub IsVisible4Int(ByVal e As PaintEventArgs)

    ' Set clip region.
    Dim clipRegion As New [Region](New Rectangle(50, 50, 100, 100))
    e.Graphics.SetClip(clipRegion, CombineMode.Replace)

    ' Set up coordinates of rectangles.
    Dim x1 As Integer = 100
    Dim y1 As Integer = 100
    Dim width1 As Integer = 20
    Dim height1 As Integer = 20
    Dim x2 As Integer = 200
    Dim y2 As Integer = 200
    Dim width2 As Integer = 20
    Dim height2 As Integer = 20

    ' If rectangle is visible, fill it.
    If e.Graphics.IsVisible(x1, y1, width1, height1) Then
        e.Graphics.FillRectangle(New SolidBrush(Color.Red), x1, y1, _
        width1, height1)
    End If
    If e.Graphics.IsVisible(x2, y2, width2, height2) Then
        e.Graphics.FillRectangle(New SolidBrush(Color.Blue), x2, y2, _
        width2, height2)
    End If
End Sub

IsVisible(Single, Single, Single, Single)

Indica si el rectángulo especificado por un par de coordenadas, un valor de ancho y un valor de alto se halla contenido en la región de recorte visible de este Graphics.Indicates whether the rectangle specified by a pair of coordinates, a width, and a height is contained within the visible clip region of this Graphics.

public:
 bool IsVisible(float x, float y, float width, float height);
public bool IsVisible (float x, float y, float width, float height);
member this.IsVisible : single * single * single * single -> bool
Public Function IsVisible (x As Single, y As Single, width As Single, height As Single) As Boolean

Parámetros

x
Single

Coordenada x de la esquina superior izquierda del rectángulo cuya visibilidad se va a comprobar.The x-coordinate of the upper-left corner of the rectangle to test for visibility.

y
Single

Coordenada y de la esquina superior izquierda del rectángulo cuya visibilidad se va a comprobar.The y-coordinate of the upper-left corner of the rectangle to test for visibility.

width
Single

Ancho del rectángulo cuya visibilidad se va a comprobar.Width of the rectangle to test for visibility.

height
Single

Alto del rectángulo cuya visibilidad se va a comprobar.Height of the rectangle to test for visibility.

Devoluciones

true si el rectángulo definido por los parámetros x, y, width y height está dentro de la región de recorte visible de este Graphics; de lo contrario, false.true if the rectangle defined by the x, y, width, and height parameters is contained within the visible clip region of this Graphics; otherwise, false.

Ejemplos

El siguiente ejemplo de código está diseñado para su uso con Windows Forms y requiere PaintEventArgs e, que Paint es un parámetro del controlador de eventos.The following code example is designed for use with Windows Forms, and it requires PaintEventArgse, which is a parameter of the Paint event handler. El código realiza las siguientes acciones:The code performs the following actions:

  • Crea una región de recorte rectangular y la establece como la región de recorte para el objeto gráfico Replacedel formulario mediante.Creates a rectangular clipping region and sets it as the clipping region for the graphics object of the form using Replace.

  • Crea la ubicación y el tamaño de dos rectángulos, uno dentro de la región de recorte y otro fuera.Creates the location and size of two rectangles, one inside the clipping region and one outside.

  • Comprueba cada uno de los rectángulos para ver su visibilidad y dibuja solo el visible.Tests each of the rectangles for visibility and draws only the visible one.

El resultado es un pequeño rectángulo rojo, que está dentro de la región de recorte.The result is one small red rectangle, which is within the clip region.

public:
   void IsVisible4Float( PaintEventArgs^ e )
   {
      // Set clip region.
      System::Drawing::Region^ clipRegion = gcnew System::Drawing::Region( Rectangle(50,50,100,100) );
      e->Graphics->SetClip( clipRegion, CombineMode::Replace );

      // Set up coordinates of rectangles.
      float x1 = 100.0F;
      float y1 = 100.0F;
      float width1 = 20.0F;
      float height1 = 20.0F;
      float x2 = 200.0F;
      float y2 = 200.0F;
      float width2 = 20.0F;
      float height2 = 20.0F;

      // If rectangle is visible, fill it.
      if ( e->Graphics->IsVisible( x1, y1, width1, height1 ) )
      {
         e->Graphics->FillRectangle( gcnew SolidBrush( Color::Red ), x1, y1, width1, height1 );
      }

      if ( e->Graphics->IsVisible( x2, y2, width2, height2 ) )
      {
         e->Graphics->FillRectangle( gcnew SolidBrush( Color::Blue ), x2, y2, width2, height2 );
      }
   }
private void IsVisible4Float(PaintEventArgs e)
{

    // Set clip region.
    Region clipRegion = new Region(new Rectangle(50, 50, 100, 100));
    e.Graphics.SetClip(clipRegion, CombineMode.Replace);

    // Set up coordinates of rectangles.
    float x1 = 100.0F;
    float y1 = 100.0F;
    float width1 = 20.0F;
    float height1 = 20.0F;
    float x2 = 200.0F;
    float y2 = 200.0F;
    float width2 = 20.0F;
    float height2 = 20.0F;

    // If rectangle is visible, fill it.
    if (e.Graphics.IsVisible(x1, y1, width1, height1))
    {
        e.Graphics.FillRectangle(new SolidBrush(Color.Red), x1, y1, width1, height1);
    }
    if (e.Graphics.IsVisible(x2, y2, width2, height2))
    {
        e.Graphics.FillRectangle(new SolidBrush(Color.Blue), x2, y2, width2, height2);
    }
}
Private Sub IsVisible4Float(ByVal e As PaintEventArgs)

    ' Set clip region.
    Dim clipRegion As New [Region](New Rectangle(50, 50, 100, 100))
    e.Graphics.SetClip(clipRegion, CombineMode.Replace)

    ' Set up coordinates of rectangles.
    Dim x1 As Single = 100.0F
    Dim y1 As Single = 100.0F
    Dim width1 As Single = 20.0F
    Dim height1 As Single = 20.0F
    Dim x2 As Single = 200.0F
    Dim y2 As Single = 200.0F
    Dim width2 As Single = 20.0F
    Dim height2 As Single = 20.0F

    ' If rectangle is visible, fill it.
    If e.Graphics.IsVisible(x1, y1, width1, height1) Then
        e.Graphics.FillRectangle(New SolidBrush(Color.Red), x1, y1, _
        width1, height1)
    End If
    If e.Graphics.IsVisible(x2, y2, width2, height2) Then
        e.Graphics.FillRectangle(New SolidBrush(Color.Blue), x2, y2, _
        width2, height2)
    End If
End Sub

Se aplica a