Region.MakeEmpty Method
Definition
Important
Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.
Initializes this Region to an empty interior.
public:
void MakeEmpty();
public void MakeEmpty ();
member this.MakeEmpty : unit -> unit
Public Sub MakeEmpty ()
Examples
The following code example demonstrates how to use the Region constructor and MakeEmpty method. This example is designed to be used with Windows Forms. Create a form and paste the following code into it. Call the FillEmptyRegion
method in the form's Paint event-handling method, passing e
as PaintEventArgs.
private:
void FillEmptyRegion( PaintEventArgs^ e )
{
// Create a region from a rectangle.
Rectangle originalRectangle = Rectangle(40,40,40,50);
System::Drawing::Region^ smallRegion = gcnew System::Drawing::Region( originalRectangle );
// Call MakeEmpty.
smallRegion->MakeEmpty();
// Fill the region in red and draw the original rectangle
// in black. Note there is nothing filled in.
e->Graphics->FillRegion( Brushes::Red, smallRegion );
e->Graphics->DrawRectangle( Pens::Black, originalRectangle );
}
private void FillEmptyRegion(PaintEventArgs e)
{
// Create a region from a rectangle.
Rectangle originalRectangle = new Rectangle(40, 40, 40, 50);
Region smallRegion = new Region(originalRectangle);
// Call MakeEmpty.
smallRegion.MakeEmpty();
// Fill the region in red and draw the original rectangle
// in black. Note there is nothing filled in.
e.Graphics.FillRegion(Brushes.Red, smallRegion);
e.Graphics.DrawRectangle(Pens.Black, originalRectangle);
}
Private Sub FillEmptyRegion(ByVal e As PaintEventArgs)
' Create a region from a rectangle.
Dim originalRectangle As New Rectangle(40, 40, 40, 50)
Dim smallRegion As New Region(originalRectangle)
' Call MakeEmpty.
smallRegion.MakeEmpty()
' Fill the region in red and draw the original rectangle
' in black. Note there is nothing filled in.
e.Graphics.FillRegion(Brushes.Red, smallRegion)
e.Graphics.DrawRectangle(Pens.Black, originalRectangle)
End Sub
Applies to
意見反應
https://aka.ms/ContentUserFeedback。
即將登場:在 2024 年,我們將逐步淘汰 GitHub 問題作為內容的意見反應機制,並將它取代為新的意見反應系統。 如需詳細資訊,請參閱:提交並檢視相關的意見反應