Visual C++ .NET/2D/Coordinates

Correcting Coordinates

 
[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();
            coords = gcnew ArrayList();  // Instantiate coords array
    }
        ArrayList ^coords;
    void InitializeComponent(void)
    {
            this->SuspendLayout();
            this->AutoScaleDimensions = System::Drawing::SizeF(6, 13);
            this->AutoScaleMode = System::Windows::Forms::AutoScaleMode::Font;
            this->ClientSize = System::Drawing::Size(292, 273);
            this->Name = L"Form1";
            this->Text = L"Click and see coords";
            this->Paint += 
                gcnew System::Windows::Forms::PaintEventHandler(this, 
                                                          &Form1::Form1_Paint);
            this->MouseDown += 
                gcnew System::Windows::Forms::MouseEventHandler(this, 
                                                      &Form1::Form1_MouseDown);
            this->ResumeLayout(false);
    }
        System::Void Form1_MouseDown(System::Object^ sender, 
                                     System::Windows::Forms::MouseEventArgs^ e)
        {
            coords->Add(Point(e->X, e->Y));
            Invalidate();
        }
        System::Void Form1_Paint(System::Object^ sender, 
                                 System::Windows::Forms::PaintEventArgs^ e)
        {
            for each (Point^ p in coords)
            {
                 e->Graphics->DrawString(String::Format("({0},{1})",p->X,p->Y),
                    gcnew Drawing::Font("Courier New", 8),
                    Brushes::Black, (Single)p->X, (Single)p->Y);
            }
        }
  };

Disappearing Coordinates

 
[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)
    {
      this->SuspendLayout();
      this->AutoScaleDimensions = System::Drawing::SizeF(6, 13);
      this->AutoScaleMode = System::Windows::Forms::AutoScaleMode::Font;
      this->ClientSize = System::Drawing::Size(292, 273);
      this->Name = L"Form1";
      this->Text = L"Click and see coords";
      this->MouseDown += gcnew System::Windows::Forms::MouseEventHandler(this, &Form1::Form1_MouseDown);
      this->ResumeLayout(false);
    }
        private: 
        System::Void Form1_MouseDown(System::Object^ sender, 
                                     System::Windows::Forms::MouseEventArgs^ e)
        {
            Graphics ^g = this->CreateGraphics();
            g->DrawString(String::Format("({0},{1})", e->X, e->Y), 
                gcnew Drawing::Font("Courier New", 8),
                Brushes::Black, (Single)e->X, (Single)e->Y);
            delete g;      // we delete the Graphics object because we 
                           // created it with the CreateGraphics() method.
        }
  };