Shape.PointToScreen-Methode
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: System.Drawing.Point
Rückgabewert
Typ: System.Drawing.Point
Ein Point, der den konvertierten Pointp in Bildschirmkoordinaten darstellt.
Beispiele
Im folgenden Beispiel wird veranschaulicht, wie die PointToScreen und RectangleToScreen-Methode verwendet, um die Farbe der RectangleShape zu ändern, wenn ein Ziehvorgang über seinen Clientbereich endet.Dieses Beispiel setzt voraus, dass Sie ein RectangleShape-Steuerelement mit dem Namen RectangleShape1 in einem Formular und dessen BackStyle-Eigenschaft auf Opaquefestgelegt ist.
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);
}
.NET Framework-Sicherheit
- Volle Vertrauenswürdigkeit für den unmittelbaren Aufrufer. Dieser Member kann von nur teilweise vertrauenswürdigem Code nicht verwendet werden. Weitere Informationen finden Sie unter Verwenden von Bibliotheken aus teilweise vertrauenswürdigem Code.
Siehe auch
Referenz
Microsoft.VisualBasic.PowerPacks-Namespace
Weitere Ressourcen
Gewusst wie: Zeichnen von Linien mit dem LineShape-Steuerelement (Visual Studio)
Einführung in das Line-Steuerelement und das Shape-Steuerelement (Visual Studio)