Visual C++ .NET/2D/Buffer

Double Buffering

<source lang="csharp"> [STAThreadAttribute] int main(array<System::String ^> ^args) {

 Application::Run(gcnew Form1());
 return 0;

}

 using namespace System;
 using namespace System::ComponentModel;
 using namespace System::Collections;
 using namespace System::Windows::Forms;
 using namespace System::Data;
 using namespace System::Drawing;
 public ref class Form1 : public System::Windows::Forms::Form
 {
 public:
   Form1(void)
   {
     InitializeComponent();
           this->SetStyle(ControlStyles::Opaque, true);
           dbBitmap = nullptr;
           dbGraphics = nullptr;
           X = -250;  // Preset to be just left of window
           Form1_Resize(nullptr, EventArgs::Empty);
   }
       System::Windows::Forms::Timer^  timer1;
   Bitmap^   dbBitmap;
       Graphics^ dbGraphics;
       int X;        // Actual x coordinate of Happy face
   void InitializeComponent(void)
   {
           this->timer1 = (gcnew System::Windows::Forms::Timer());
           this->SuspendLayout();
           // 
           // timer1
           // 
           this->timer1->Enabled = true;
           this->timer1->Interval = 10;
           this->timer1->Tick += 
               gcnew System::EventHandler(this, &Form1::timer1_Tick);
           // 
           // Form1
           // 
           this->AutoScaleDimensions = System::Drawing::SizeF(6, 13);
           this->AutoScaleMode = System::Windows::Forms::AutoScaleMode::Font;
           this->ClientSize = System::Drawing::Size(500, 300);
           this->Name = L"Form1";
           this->Text = L"Sliding Happy Face";
           this->Paint += 
               gcnew System::Windows::Forms::PaintEventHandler(this, 
                                                        &Form1::Form1_Paint);
           this->Resize += 
               gcnew System::EventHandler(this, &Form1::Form1_Resize);
           this->ResumeLayout(false);
       }
       System::Void Form1_Paint(System::Object^ sender, 
                                System::Windows::Forms::PaintEventArgs^ e)
       {
            // Move image at end of line start from beginning
           if (X < ClientRectangle.Width)
           {
               X ++;
               dbGraphics->TranslateTransform(1.0, 0.0);
           }
           else
           {
               X = -250;
               dbGraphics->TranslateTransform(
                   (float)-(ClientRectangle.Width+250), 0.0);
           }
           // Clear background
           dbGraphics->Clear(Color::White);

           // redraw image from scratch
           Pen^ b4pen = gcnew Pen(Color::Black, 4);
           Drawing::Rectangle Head  = Drawing::Rectangle(0, 0, 250, 250);
           dbGraphics->FillEllipse(Brushes::Yellow, Head);
           dbGraphics->DrawEllipse(b4pen, Head);
           Drawing::Rectangle Mouth = Drawing::Rectangle(75, 150, 100, 50);
           dbGraphics->FillPie(Brushes::White, Mouth,0,180);
           dbGraphics->DrawPie(b4pen, Mouth, 0, 180);
           Drawing::Rectangle LEye  = Drawing::Rectangle(75, 75, 25, 25);
           dbGraphics->FillEllipse(Brushes::White, LEye);
           dbGraphics->DrawEllipse(b4pen, LEye);
           Drawing::Rectangle REye  = Drawing::Rectangle(150, 75, 25, 25);
           dbGraphics->FillEllipse(Brushes::White, REye);
           dbGraphics->DrawEllipse(b4pen, REye);
           // Make the buffer visible
           e->Graphics->DrawImageUnscaled(dbBitmap, 0, 0);
           delete b4pen;
       }
       System::Void Form1_Resize(System::Object^ sender, System::EventArgs^ e)
       {
            // Get rid of old stuff
           if (dbGraphics != nullptr)
           {
               delete dbGraphics;
           }
           if (dbBitmap != nullptr)
           {
               delete dbBitmap;
           }
           if (ClientRectangle.Width > 0 && ClientRectangle.Height > 0)
           {
               // Create a bitmap
               dbBitmap = gcnew Bitmap(ClientRectangle.Width,
                                       ClientRectangle.Height);
               // Grab its Graphics
               dbGraphics = Graphics::FromImage(dbBitmap);
               // Set up initial translation after resize (also at start)
               dbGraphics->TranslateTransform((float)X, 25.0);
           }
      }

       System::Void timer1_Tick(System::Object^ sender, System::EventArgs^ e)
       {
           // Move the image
           Invalidate();
      }
 };
  
 </source>

Single Buffering

<source lang="csharp">

 using namespace System;
 using namespace System::ComponentModel;
 using namespace System::Collections;
 using namespace System::Windows::Forms;
 using namespace System::Data;
 using namespace System::Drawing;
 public ref class Form1 : public System::Windows::Forms::Form
 {
 public:
   Form1(void)
   {
     InitializeComponent();
           X = -250;  // Preset to be just left of window
   }
       System::Windows::Forms::Timer^  timer1;
       float X;        // Actual x coordinate of Happy face
   void InitializeComponent(void)
   {
           this->timer1 = 
               (gcnew System::Windows::Forms::Timer());
           this->SuspendLayout();
           // 
           // timer1
           // 
           this->timer1->Enabled = true;
           this->timer1->Interval = 10;
           this->timer1->Tick += 
               gcnew System::EventHandler(this, &Form1::timer1_Tick);
           // 
           // Form1
           // 
           this->AutoScaleDimensions = System::Drawing::SizeF(6, 13);
           this->AutoScaleMode = System::Windows::Forms::AutoScaleMode::Font;
           this->ClientSize = System::Drawing::Size(500, 300);
           this->Name = L"Form1";
           this->Text = L"Form1";
           this->Paint += 
               gcnew System::Windows::Forms::PaintEventHandler(this, 
                                                        &Form1::Form1_Paint);
           this->ResumeLayout(false);
       }
       System::Void Form1_Paint(System::Object^ sender, 
                                System::Windows::Forms::PaintEventArgs^ e)
       {
           Graphics^ g = e->Graphics;
           // Move image at end of line start from beginning
           if (X < ClientRectangle.Width)
               X += 1.0;
           else
               X = -250.0;
           g->TranslateTransform(X, 25.0);
           // redraw images from scratch
           Pen^ b4pen = gcnew Pen(Color::Black, 4);

           Drawing::Rectangle Head  = Drawing::Rectangle(0, 0, 250, 250);
           g->FillEllipse(Brushes::Yellow, Head);
           g->DrawEllipse(b4pen, Head);
           Drawing::Rectangle Mouth = Drawing::Rectangle(75, 150, 100, 50);
           g->FillPie(Brushes::White, Mouth,0,180);
           g->DrawPie(b4pen, Mouth, 0, 180);
           Drawing::Rectangle LEye  = Drawing::Rectangle(75, 75, 25, 25);
           g->FillEllipse(Brushes::White, LEye);
           g->DrawEllipse(b4pen, LEye);
           Drawing::Rectangle REye  = Drawing::Rectangle(150, 75, 25, 25);
           g->FillEllipse(Brushes::White, REye);
           g->DrawEllipse(b4pen, REye);
           delete b4pen;
       }
       System::Void timer1_Tick(System::Object^ sender, System::EventArgs^ e)
       {
           // Move the image
           Invalidate();
      }
 };

[STAThreadAttribute] int main(array<System::String ^> ^args) {

 Application::Run(gcnew Form1());
 return 0;

}

 </source>