Shape.PointToClient 方法

2012-10-25

将指定屏幕点的位置计算成工作区坐标。

命名空间： Microsoft.VisualBasic.PowerPacks
程序集： Microsoft.VisualBasic.PowerPacks.Vs（在 Microsoft.VisualBasic.PowerPacks.Vs.dll 中）

语法

声明
Public Function PointToClient ( _
    position As Point _
) As Point

public Point PointToClient(
    Point position
)

public:
Point PointToClient(
    Point position
)

member PointToClient : 
        position:Point -> Point

public function PointToClient(
    position : Point
) : Point

参数

position
类型：System.Drawing.Point

返回值

类型：System.Drawing.Point
一个 Point，它表示转换后的 Point、p（以工作区坐标表示）。

备注

PointToClient 方法还可用于将返回屏幕坐标到窗体的工作区坐标的值例如 DragEventArgs 。

示例

，在图像文件拖放到其上时，下面的示例演示如何使用 PointToClient 方法移动 RectangleShape 。PointToClient 方法移动 RectangleShape 相对客户端窗体。例如，因此，如果放置位置 10 像素放置和 10 像素在矩形右边的左上角，矩形将向下移到位置 10 像素、 10 像素的窗体右边的左上角。

此示例要求您具有名为在窗体的 RectangleShape1 的一个 RectangleShape 控件，并且该窗体的 AllowDrop 属性设置为 true。

Private Sub Form1_DragDrop(
    ByVal sender As Object, 
    ByVal e As System.Windows.Forms.DragEventArgs
  ) Handles Me.DragDrop

    ' Determine whether the drop is within the rectangle.
    If RectangleShape1.HitTest(e.X, e.Y) = True Then
        ' Handle file data.
        If e.Data.GetDataPresent(DataFormats.FileDrop) Then
            ' Assign the file names to a string array, in 
            ' case the user has selected multiple files.
            Dim files As String() = 
              CType(e.Data.GetData(DataFormats.FileDrop), String())
            Try
                ' Assign the first image to the BackGroundImage
                ' property.
                RectangleShape1.BackgroundImage = 
                  Image.FromFile(files(0))
                ' Set the rectangle ___location relative to the form.
                RectangleShape1.Location = 
                  RectangleShape1.PointToClient(New Point(e.X, e.Y))
            Catch ex As Exception
                MessageBox.Show(ex.Message)
                Return
            End Try
        End If
    End If
End Sub
Private Sub Form1_DragEnter(
    ByVal sender As Object, 
    ByVal e As DragEventArgs
  ) Handles MyBase.DragEnter

    ' If the data is a file, display the copy cursor.
    If e.Data.GetDataPresent(DataFormats.FileDrop) Then
        e.Effect = DragDropEffects.Copy
    Else
        e.Effect = DragDropEffects.None
    End If
End Sub

private void Form1_DragDrop(object sender, System.Windows.Forms.DragEventArgs e)
{
    // Determine whether the drop is within the rectangle.
    if (rectangleShape1.HitTest(e.X, e.Y)==true)
        // Handle file data.
    {
        if (e.Data.GetDataPresent(DataFormats.FileDrop))
            // Assign the file names to a string array, in 
            // case the user has selected multiple files.
        {
            string[] files = (string[]) e.Data.GetData(DataFormats.FileDrop);
            try
            {
                // Assign the first image to the BackGroundImage
                // property.
                rectangleShape1.BackgroundImage = Image.FromFile(files[0]);
                // Set the rectangle ___location relative to the form.
                rectangleShape1.Location = 
                    rectangleShape1.PointToClient(new Point(e.X, e.Y));
            }
            catch(Exception ex)
            {
                MessageBox.Show(ex.Message);
                return;
            }
        }
    }
}
private void Form1_DragEnter(object sender, DragEventArgs e)
{
    // If the data is a file, display the copy cursor.
    if (e.Data.GetDataPresent(DataFormats.FileDrop))
    {
        e.Effect = DragDropEffects.Copy;
    }
    else
    {
        e.Effect = DragDropEffects.None;
    }
}