Shape.PointToScreen-Methode

Artikel
05/16/2015

Rechnet die Position des angegebenen Clientpunkts in Bildschirmkoordinaten um.

Namespace: Microsoft.VisualBasic.PowerPacks
Assembly: Microsoft.VisualBasic.PowerPacks.Vs (in Microsoft.VisualBasic.PowerPacks.Vs.dll)

Syntax

'Declaration
Public Function PointToScreen ( _
    position As Point _
) As Point

public Point PointToScreen(
    Point position
)

public:
Point PointToScreen(
    Point position
)

member PointToScreen : 
        position:Point -> Point

public function PointToScreen(
    position : Point
) : Point

Parameter

position
Typ: Point

Rückgabewert

Typ: Point
Ein Point, der den konvertierten Pointp in Bildschirmkoordinaten darstellt.

Beispiele

Im folgenden Beispiel wird veranschaulicht, wie Sie die PointToScreen und RectangleToScreen Methoden zum Ändern der Farbe von einer RectangleShape bei ein Ziehvorgang endet, über den Clientbereich. In diesem Beispiel benötigen Sie eine RectangleShape Steuerelement namens RectangleShape1 in einem Formular die BackStyle -Eigenschaft Opaque.

Public isDrag As Boolean = True 
Public theRectangle As System.Drawing.Rectangle

Private Sub Form1_MouseMove(
    ByVal sender As Object, 
    ByVal e As System.Windows.Forms.MouseEventArgs
  ) Handles RectangleShape1.MouseMove

    ' If the mouse is being dragged, undraw and redraw the rectangle 
    ' while the mouse moves. 
    If (isDrag) Then 

        ' Hide the previous rectangle by calling the 
        ' DrawReversibleFrame method, using the same parameters.
        ControlPaint.DrawReversibleFrame(theRectangle, Me.BackColor, 
          FrameStyle.Dashed)

        ' Calculate the endpoint and dimensions for the new rectangle,  
        ' again by using the PointToScreen method. 
        Dim startPoint As Point = New Point(RectangleShape1.Width, 
         RectangleShape1.Height)
        Dim endPoint As Point = RectangleShape1.PointToScreen(New Point(e.X, e.Y))
        Dim width As Integer = endPoint.X - startPoint.X
        Dim height As Integer = endPoint.Y - startPoint.Y
        theRectangle = New Rectangle(startPoint.X, startPoint.Y, 
         width, height)

        ' Draw the new rectangle by calling DrawReversibleFrame again.  
        ControlPaint.DrawReversibleFrame(theRectangle, Me.BackColor, 
          FrameStyle.Dashed)
    End If 
End Sub 

Private Sub Form1_MouseUp() Handles RectangleShape1.MouseUp

    ' If the MouseUp event occurs, the user is not dragging.
    isDrag = False 
    ' Draw the rectangle to be evaluated. Set a dashed frame style  
    ' by using the FrameStyle enumeration.
    ControlPaint.DrawReversibleFrame(theRectangle, Me.BackColor, 
      FrameStyle.Dashed)
    ' Find out which controls intersect the rectangle, and change 
    ' their colors. 
    ' The method uses the RectangleToScreen method to convert the  
    ' control's client coordinates to screen coordinates. 
    Dim controlRectangle As Rectangle

    controlRectangle = RectangleShape1.RectangleToScreen(
       RectangleShape1.ClientRectangle)
    If controlRectangle.IntersectsWith(theRectangle) Then
        RectangleShape1.BackColor = Color.BurlyWood
    End If 

    ' Reset the rectangle.
    theRectangle = New Rectangle(0, 0, 0, 0)
End Sub

public bool isDrag = true;
public System.Drawing.Rectangle theRectangle;

private void Form1_MouseMove(object sender, System.Windows.Forms.MouseEventArgs e)
{

    // If the mouse is being dragged, undraw and redraw the rectangle 
    // while the mouse moves. 
    if (isDrag)

    // Hide the previous rectangle by calling the 
    // DrawReversibleFrame method, using the same parameters.
    {
        ControlPaint.DrawReversibleFrame(theRectangle, this.BackColor, FrameStyle.Dashed);

        // Calculate the endpoint and dimensions for the new rectangle,  
        // again by using the PointToScreen method.
        Point startPoint = new Point(rectangleShape1.Width, rectangleShape1.Height);
        Point endPoint = rectangleShape1.PointToScreen(new Point(e.X, e.Y));
        int width = endPoint.X - startPoint.X;
        int height = endPoint.Y - startPoint.Y;
        theRectangle = new Rectangle(startPoint.X, startPoint.Y, width, height);

        // Draw the new rectangle by calling DrawReversibleFrame again.  
        ControlPaint.DrawReversibleFrame(theRectangle, this.BackColor, FrameStyle.Dashed);
    }
}

private void Form1_MouseUp(object sender, System.Windows.Forms.MouseEventArgs e)
{

    // If the MouseUp event occurs, the user is not dragging.
    isDrag = false;
    // Draw the rectangle to be evaluated. Set a dashed frame style  
    // by using the FrameStyle enumeration.
    ControlPaint.DrawReversibleFrame(theRectangle, this.BackColor, FrameStyle.Dashed);
    // Find out which controls intersect the rectangle, and change 
    // their colors. 
    // The method uses the RectangleToScreen method to convert the  
    // control's client coordinates to screen coordinates.
    Rectangle controlRectangle;

    controlRectangle = rectangleShape1.RectangleToScreen(rectangleShape1.ClientRectangle);
    if (controlRectangle.IntersectsWith(theRectangle))
    {
        rectangleShape1.BackColor = Color.BurlyWood;
    }

    // Reset the rectangle.
    theRectangle = new Rectangle(0, 0, 0, 0);
}

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