#pragma once
#define PI 3.14159265

namespace Triangle {

    using namespace System;
    using namespace System::ComponentModel;
    using namespace System::Collections;
    using namespace System::Windows::Forms;
    using namespace System::Data;
    using namespace System::Drawing;

    float GetDistance(Point A, Point B)
    {
        return sqrtf(powf((A.X-B.X),2) + powf((A.Y-B.Y),2));
    }

    public ref struct Triangle
    {
        Triangle()
        {
            LinePen = gcnew Pen(Color::Black, 3.0f);
            PointA = Point(300, 100);
            PointB = Point(200, 200);
            PointC = Point(400, 200);
            Update();
        }

        void Update()
        {
            SideA = GetDistance(PointB, PointC);
            SideB = GetDistance(PointC, PointA);
            SideC = GetDistance(PointA, PointB);

            AngleA = GetAngle(PointA);
            AngleB = GetAngle(PointB);
            AngleC = GetAngle(PointC);
        }


        float GetAngle(Point X)
        {
            if(X == PointA)
                return acos((powf(SideC, 2) + powf(SideB, 2) - powf(SideA, 2))/(2*SideB*SideC)) * 180 / PI;
            if(X == PointB)
                return acos((powf(SideA, 2) + powf(SideC, 2) - powf(SideB, 2))/(2*SideA*SideC)) * 180 / PI;
            if(X == PointC)
                return acos((powf(SideA, 2) + powf(SideB, 2) - powf(SideC, 2))/(2*SideA*SideB)) * 180 / PI;
        }

        void Draw(Graphics^ Graphic)
        {
            Graphic->Clear(Color::White);
            Graphic->DrawLine(LinePen, PointA, PointB);
            Graphic->DrawLine(LinePen, PointB, PointC);
            Graphic->DrawLine(LinePen, PointC, PointA);
        }

    private:
        Pen ^LinePen;

    public:
        Point PointA, PointB, PointC;
        float AngleA, AngleB, AngleC;
        float SideA, SideB, SideC;
    };

    /// <summary>
    /// Zusammenfassung für MainWindow
    /// </summary>
    public ref class MainWindow : public System::Windows::Forms::Form
    {
    public:
        MainWindow(void)
        {
            InitializeComponent();
            //
            //TODO: Konstruktorcode hier hinzufügen.
            //

            Tri = gcnew Triangle();
            PictureA = gcnew Bitmap(600, 300);
            PictureB = gcnew Bitmap(600, 300);

        }

    protected:
        /// <summary>
        /// Verwendete Ressourcen bereinigen.
        /// </summary>
        ~MainWindow()
        {
            if (components)
            {
                delete components;
            }
        }

    protected: Triangle^ Tri;
    protected: Bitmap ^PictureA, ^PictureB;

    private: System::Void MainWindow_Load(System::Object^  sender, System::EventArgs^  e)
             {

                 Tri->Draw(Graphics::FromImage(PictureA));
                 pbDrawing->Image = PictureA;

                 tbSideA->Text = Tri->SideA.ToString();
                 tbSideB->Text = Tri->SideB.ToString();
                 tbSideC->Text = Tri->SideC.ToString();
                 tbAngleA->Text = Tri->AngleA.ToString();
                 tbAngleB->Text = Tri->AngleB.ToString();
                 tbAngleC->Text = Tri->AngleC.ToString();
                 tbPointA->Text = Tri->PointA.ToString();
                 tbPointB->Text = Tri->PointB.ToString();
                 tbPointC->Text = Tri->PointC.ToString();
             }

    private: System::Void MainWindow_FormClosing(System::Object^  sender, System::Windows::Forms::FormClosingEventArgs^  e)
             {
             }

    private: System::Void pbDrawing_MouseDown(System::Object^  sender, System::Windows::Forms::MouseEventArgs^  e)
             {
                 if(GetDistance(Point(e->X, e->Y), Tri->PointA) <= 10)
                    this->pbDrawing->MouseMove += gcnew System::Windows::Forms::MouseEventHandler(this, &MainWindow::pbDrawing_MouseMove_PA);
                 else if(GetDistance(Point(e->X, e->Y), Tri->PointB) <= 10)
                    this->pbDrawing->MouseMove += gcnew System::Windows::Forms::MouseEventHandler(this, &MainWindow::pbDrawing_MouseMove_PB);
                 else if(GetDistance(Point(e->X, e->Y), Tri->PointC) <= 10)
                    this->pbDrawing->MouseMove += gcnew System::Windows::Forms::MouseEventHandler(this, &MainWindow::pbDrawing_MouseMove_PC);
             }
    private: System::Void pbDrawing_MouseUp(System::Object^  sender, System::Windows::Forms::MouseEventArgs^  e)
             {
                 this->pbDrawing->MouseMove -= gcnew System::Windows::Forms::MouseEventHandler(this, &MainWindow::pbDrawing_MouseMove_PA);
                 this->pbDrawing->MouseMove -= gcnew System::Windows::Forms::MouseEventHandler(this, &MainWindow::pbDrawing_MouseMove_PB);
                 this->pbDrawing->MouseMove -= gcnew System::Windows::Forms::MouseEventHandler(this, &MainWindow::pbDrawing_MouseMove_PC);
             }
    private: System::Void pbDrawing_MouseMove_PA(System::Object^  sender, System::Windows::Forms::MouseEventArgs^  e)
             {
                 Tri->PointA = Point(e->X, e->Y);
                 Tri->Update();

                 if(pbDrawing->Image == PictureB)
                 {
                     Tri->Draw(Graphics::FromImage(PictureA));
                     pbDrawing->Image = PictureA;
                 }
                 else
                 {
                     Tri->Draw(Graphics::FromImage(PictureB));
                     pbDrawing->Image = PictureB;
                 }

                 tbSideB->Text = Tri->SideB.ToString();
                 tbSideC->Text = Tri->SideC.ToString();
                 tbAngleA->Text = Tri->AngleA.ToString();
                 tbAngleB->Text = Tri->AngleB.ToString();
                 tbAngleC->Text = Tri->AngleC.ToString();
                 tbPointA->Text = Tri->PointA.ToString();
             }
    private: System::Void pbDrawing_MouseMove_PB(System::Object^  sender, System::Windows::Forms::MouseEventArgs^  e)
             {
                 Tri->PointB = Point(e->X, e->Y);
                 Tri->Update();

                 if(pbDrawing->Image == PictureB)
                 {
                     Tri->Draw(Graphics::FromImage(PictureA));
                     pbDrawing->Image = PictureA;
                 }
                 else
                 {
                     Tri->Draw(Graphics::FromImage(PictureB));
                     pbDrawing->Image = PictureB;
                 }

                 tbSideA->Text = Tri->SideA.ToString();
                 tbSideC->Text = Tri->SideC.ToString();
                 tbAngleA->Text = Tri->AngleA.ToString();
                 tbAngleB->Text = Tri->AngleB.ToString();
                 tbAngleC->Text = Tri->AngleC.ToString();
                 tbPointB->Text = Tri->PointB.ToString();
             }
    private: System::Void pbDrawing_MouseMove_PC(System::Object^  sender, System::Windows::Forms::MouseEventArgs^  e)
             {
                 Tri->PointC = Point(e->X, e->Y);
                 Tri->Update();

                 if(pbDrawing->Image == PictureB)
                 {
                     Tri->Draw(Graphics::FromImage(PictureA));
                     pbDrawing->Image = PictureA;
                 }
                 else
                 {
                     Tri->Draw(Graphics::FromImage(PictureB));
                     pbDrawing->Image = PictureB;
                 }

                 tbSideA->Text = Tri->SideA.ToString();
                 tbSideB->Text = Tri->SideB.ToString();
                 tbAngleA->Text = Tri->AngleA.ToString();
                 tbAngleB->Text = Tri->AngleB.ToString();
                 tbAngleC->Text = Tri->AngleC.ToString();
                 tbPointC->Text = Tri->PointC.ToString();
             }

    };
}