Rectangle.IsEmpty 属性

定义

命名空间:
System.Drawing
程序集:
netstandard.dll, System.Drawing.Primitives.dll
程序集:
System.Drawing.Primitives.dll
程序集:
System.Drawing.dll
程序集:
netstandard.dll
Source:
Rectangle.cs
Source:
Rectangle.cs
Source:
Rectangle.cs
Source:
Rectangle.cs
Source:
Rectangle.cs

测试此 Rectangle 值的所有数值属性是否为零。

public:
 property bool IsEmpty { bool get(); };
[System.ComponentModel.Browsable(false)]
public bool IsEmpty { get; }
public bool IsEmpty { get; }
[<System.ComponentModel.Browsable(false)>]
member this.IsEmpty : bool
member this.IsEmpty : bool
Public ReadOnly Property IsEmpty As Boolean

属性值

Boolean

如果此属性的true值为零，则Width返回Height这X两个属性的值为YRectangle零;否则为 false。

属性
BrowsableAttribute

示例

下面的代码示例演示了成员IntersectIsEmpty和IntersectsWith成员。 此示例应与Windows窗体一起使用。 将此代码粘贴到窗体中，并在处理表单 Paint 的事件时调用此方法，并传递 e 为 PaintEventArgs。

private:
   void InstanceRectangleIntersection( PaintEventArgs^ e )
   {
      Rectangle rectangle1 = Rectangle(50,50,200,100);
      Rectangle rectangle2 = Rectangle(70,20,100,200);
      e->Graphics->DrawRectangle( Pens::Black, rectangle1 );
      e->Graphics->DrawRectangle( Pens::Red, rectangle2 );
      if ( rectangle1.IntersectsWith( rectangle2 ) )
      {
         rectangle1.Intersect( rectangle2 );
         if (  !rectangle1.IsEmpty )
         {
            e->Graphics->FillRectangle( Brushes::Green, rectangle1 );
         }
      }
   }

private void InstanceRectangleIntersection(PaintEventArgs e)
{

    Rectangle rectangle1 = new Rectangle(50, 50, 200, 100);
    Rectangle rectangle2 = new Rectangle(70, 20, 100, 200);

    e.Graphics.DrawRectangle(Pens.Black, rectangle1);
    e.Graphics.DrawRectangle(Pens.Red, rectangle2);

    if (rectangle1.IntersectsWith(rectangle2))
    {
        rectangle1.Intersect(rectangle2);
        if (!rectangle1.IsEmpty)
        {
            e.Graphics.FillRectangle(Brushes.Green, rectangle1);
        }
    }
}

  Private Sub InstanceRectangleIntersection( _
      ByVal e As PaintEventArgs)

      Dim rectangle1 As New Rectangle(50, 50, 200, 100)
      Dim rectangle2 As New Rectangle(70, 20, 100, 200)

      e.Graphics.DrawRectangle(Pens.Black, rectangle1)
      e.Graphics.DrawRectangle(Pens.Red, rectangle2)

      If (rectangle1.IntersectsWith(rectangle2)) Then
          rectangle1.Intersect(rectangle2)
          If Not (rectangle1.IsEmpty) Then
              e.Graphics.FillRectangle(Brushes.Green, rectangle1)
          End If
      End If
  End Sub

适用于