bufferingexamples.cpp

#using <System.Drawing.dll>
#using <System.Windows.Forms.dll>
#using <System.dll>

usingnamespaceSystem;
usingnamespaceSystem::ComponentModel;
usingnamespaceSystem::Drawing;
usingnamespaceSystem::Windows::Forms;
usingnamespaceSystem::Security::Permissions;

public ref classBufferingExamples: publicForm
{
private:
 BufferedGraphicsContext^ appDomainBufferedGraphicsContext;
 BufferedGraphics^ grafx;

public:
 [SecurityPermission(SecurityAction::Demand, Flags=SecurityPermissionFlag::UnmanagedCode)]
BufferingExamples() : Form()
 {
//<Snippet1>
// Retrieves the BufferedGraphicsContext for the 
// current application domain.
 BufferedGraphicsContext^ appDomainGraphicsContext =
 BufferedGraphicsManager::Current;
//</Snippet1>

 appDomainGraphicsContext->MaximumBuffer = System::Drawing::Size( 400, 400 );
 appDomainBufferedGraphicsContext = BufferedGraphicsManager::Current;

//<Snippet2>
// Sets the maximum size for the graphics buffer 
// of the buffered graphics context. Any allocation 
// requests for a buffer larger than this will create 
// a temporary buffered graphics context to host 
// the graphics buffer.
 appDomainBufferedGraphicsContext->MaximumBuffer = System::Drawing::Size( 400, 400 );
//</Snippet2>

//<Snippet3>
// Allocates a graphics buffer using the pixel format 
// of the specified Graphics object.
 grafx = appDomainBufferedGraphicsContext->Allocate( this->CreateGraphics(),
Rectangle( 0, 0, 400, 400 ) );
//</Snippet3>

//<Snippet4>
// Allocates a graphics buffer using the pixel format 
// of the specified handle to a device context.
 grafx = appDomainBufferedGraphicsContext->Allocate( this->Handle,
Rectangle( 0, 0, 400, 400 ) );
//</Snippet4>
 }

//<Snippet5>
private:
voidRenderToGraphics( Graphics^ g )
 {
 grafx->Render( g );
 }
//</Snippet5>

//<Snippet6>
private:
voidRenderToDeviceContextHandle( IntPtr hDC )
 {
 grafx->Render( hDC );
 }
//</Snippet6>
};

[STAThread]
intmain()
{
Application::Run( gcnew BufferingExamples );
}