Graphics.Save Graphics.Save Graphics.Save Graphics.Save Method

定义

保存此 Graphics 的当前状态,并用 GraphicsState 标识保存的状态。Saves the current state of this Graphics and identifies the saved state with a GraphicsState.

public:
 System::Drawing::Drawing2D::GraphicsState ^ Save();
public System.Drawing.Drawing2D.GraphicsState Save ();
member this.Save : unit -> System.Drawing.Drawing2D.GraphicsState
Public Function Save () As GraphicsState

返回

此方法返回 GraphicsState,该对象表示此 Graphics 的保存状态。This method returns a GraphicsState that represents the saved state of this Graphics.

示例

下面的代码示例旨在与 Windows 窗体一起使用,并且它需要PaintEventArgs e作为Paint事件处理程序的参数。The following code example is designed for use with Windows Forms, and it requires PaintEventArgse, which is a parameter of the Paint event handler. 该代码执行下列操作:The code performs the following actions:

  • 用矢量(100,0)转换 Windows 窗体的世界转换。Translates the world transform of the Windows Form by a vector (100, 0).

  • 保存窗体的图形状态。Saves the graphics state of the form.

  • 将窗体的世界变换重置为标识(2x2 恒等矩阵和零矢量平移),并使用纯红色画笔填充矩形。Resets the world transform of the form to an identity (2x2 identity matrix plus a zero-vector translation) and fills a rectangle with a solid red brush.

  • 还原已转换的图形状态并使用纯色纯色画笔填充矩形。Restores the translated graphics state and fills a rectangle with a solid blue brush.

结果是左侧的未转换红色实心矩形和窗体右侧的已转换蓝色实心矩形。The result is an untranslated red-filled rectangle on the left and a translated blue-filled rectangle on the right of the form.

public:
   void SaveRestore3( PaintEventArgs^ e )
   {
      // Translate transformation matrix.
      e->Graphics->TranslateTransform( 100, 0 );

      // Save translated graphics state.
      GraphicsState^ transState = e->Graphics->Save();

      // Reset transformation matrix to identity and fill rectangle.
      e->Graphics->ResetTransform();
      e->Graphics->FillRectangle( gcnew SolidBrush( Color::Red ), 0, 0, 100, 100 );
      
      // Restore graphics state to translated state and fill second
      // rectangle.
      e->Graphics->Restore( transState );
      e->Graphics->FillRectangle( gcnew SolidBrush( Color::Blue ), 0, 0, 100, 100 );
   }
private void SaveRestore3(PaintEventArgs e)
{

    // Translate transformation matrix.
    e.Graphics.TranslateTransform(100, 0);

    // Save translated graphics state.
    GraphicsState transState = e.Graphics.Save();

    // Reset transformation matrix to identity and fill rectangle.
    e.Graphics.ResetTransform();
    e.Graphics.FillRectangle(new SolidBrush(Color.Red), 0, 0, 100, 100);

    // Restore graphics state to translated state and fill second

    // rectangle.
    e.Graphics.Restore(transState);
    e.Graphics.FillRectangle(new SolidBrush(Color.Blue), 0, 0, 100, 100);
}
Private Sub SaveRestore3(ByVal e As PaintEventArgs)

    ' Translate transformation matrix.
    e.Graphics.TranslateTransform(100, 0)

    ' Save translated graphics state.
    Dim transState As GraphicsState = e.Graphics.Save()

    ' Reset transformation matrix to identity and fill rectangle.
    e.Graphics.ResetTransform()
    e.Graphics.FillRectangle(New SolidBrush(Color.Red), 0, 0, 100, 100)

    ' Restore graphics state to translated state and fill second

    ' rectangle.
    e.Graphics.Restore(transState)
    e.Graphics.FillRectangle(New SolidBrush(Color.Blue), 0, 0, _
    100, 100)
End Sub

注解

调用Save的方法Graphics时,保存的Graphics状态的信息块将放在堆栈上。When you call the Save method of a Graphics, an information block that holds the state of the Graphics is put on a stack. Save 方法GraphicsState返回标识该信息块的。The Save method returns a GraphicsState that identifies that information block. 将标识GraphicsState传递Restore到方法时,将从堆栈中移除信息块,并使用将Save其还原Graphics到在方法调用时它所处的状态。When you pass the identifying GraphicsState to the Restore method, the information block is removed from the stack and is used to restore the Graphics to the state it was in at the time of the Save method call. 请注意, GraphicsState给定调用Save方法返回的仅可向Restore方法传递一次。Note that the GraphicsState returned by a given call to the Save method can be passed only once to the Restore method.

对方法的Save调用可以嵌套; 也就是说,在调用Restore方法之前,可以Save多次调用方法。Calls to the Save method can be nested; that is, you can call the Save method several times before you call the Restore method. 每次调用Save方法时,都会将信息块放在堆栈上,并GraphicsState收到信息块的。Each time you call the Save method, an information block is put on the stack, and you receive a GraphicsState for the information block. 将其中一个Restore对象传递给方法时Graphics ,将返回到它在Save方法调用时返回该特定GraphicsState的状态。When you pass one of those objects to the Restore method, the Graphics is returned to the state it was in at the time of the Save method call that returned that particular GraphicsState. 从堆栈中删除由该Save方法调用放置在堆栈上的信息块,并且也会删除该Save方法调用之后置于该堆栈上的所有信息块。The information block placed on the stack by that Save method call is removed from the stack, and all information blocks placed on that stack after that Save method call are also removed.

调用方法会将信息块放在与调用Save方法相同的堆栈上。 BeginContainerCalls to the BeginContainer method place information blocks on the same stack as calls to the Save method. 正如Restore调用Save与调用配对一样, EndContainer方法调用与BeginContainer方法调用配对。Just as a Restore call is paired with a Save call, a EndContainer method call is paired with a BeginContainer method call.

调用Restore方法时,将从堆栈中移除在调用Save方法后,在堆栈Save上放置的所有BeginContainer信息块(由方法或方法调用)。When you call the Restore method, all information blocks placed on the stack (by the Save method or by the BeginContainer method) after the corresponding call to the Save method are removed from the stack. 同样, EndContainer当调用方法时,将从堆栈中移除对BeginContainer方法的相应调用后Save放置在堆栈上BeginContainer的所有信息块(由方法或方法调用)。Likewise, When you call the EndContainer method, all information blocks placed on the stack (by the Save method or by the BeginContainer method) after the corresponding call to the BeginContainer method are removed from the stack.

适用于