Shape.PointToScreen 方法

發行項
05/16/2015

將指定的工作區點的位置計算為螢幕座標。

命名空間： Microsoft.VisualBasic.PowerPacks
組件： Microsoft.VisualBasic.PowerPacks.Vs (在 Microsoft.VisualBasic.PowerPacks.Vs.dll 中)

語法

'宣告
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

參數

position
類型：Point

傳回值

類型：Point
Point，以螢幕座標表示的轉換後 Point (p)。

範例

下列範例示範如何使用PointToScreen和RectangleToScreen方法來變更色彩的RectangleShape透過其工作區的拖曳作業結束時。此範例中您需要RectangleShape控制項上的表單，名為 RectangleShape1 其BackStyle屬性設定為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);
}