//---------------------------------------------------------------------------

#include <vcl.h>
#include <tchar.h>
#include <math.h>
#pragma hdrstop

#include "fPanoViewerC.h"
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma link "GLS.Objects"
#pragma link "GLS.Scene"
#pragma link "GLS.Texture"
#pragma link "GLS.SceneViewer"
#pragma link "GLS.BaseClasses"
#pragma link "GLS.Coordinates"

#pragma link "GLS.Material"
#pragma link "GLS.Keyboard"
#pragma resource "*.dfm"
TForm1* Form1;
//---------------------------------------------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner) : TForm(Owner) {}
//---------------------------------------------------------------------------

//---------------------------------------------------------------------------

void __fastcall TForm1::FormCreate(TObject* Sender)
{
  Path = GetCurrentAssetPath(); // or Path = ExtractFilePath(ParamStr(0));
  SetCurrentDir(Path + "\\panorana"); // GetDir(0, Path);
  OpenPictureDialog1->InitialDir = Path + "\\panorama";
  OpenPictureDialog1->FileName = "sejourstmathieu2048.jpg";
}

void __fastcall TForm1::BtnLoadClick(TObject* Sender)
{
	if (OpenPictureDialog1->Execute())
		GLMaterialLibrary1->Materials->Items[0]
			->Material->Texture->Image->LoadFromFile(
				OpenPictureDialog1->FileName);
}
//---------------------------------------------------------------------------
void __fastcall TForm1::TrackBar1Change(TObject* Sender)
{
	GLCamera1->FocalLength = TrackBar1->Position;
}

//---------------------------------------------------------------------------

void __fastcall TForm1::GLCadencer1Progress(
    TObject* Sender, const double deltaTime, const double newTime)
{
    const int step_size = 20;
    float delta;
    float dx, dy;
    delta = step_size * 40 / GLCamera1->FocalLength * deltaTime;
    dx = 0;
    dy = 0;
    if (IsKeyDown(VK_LEFT))
        dx = dx + delta;
    if (IsKeyDown(VK_UP))
        dy = dy + delta;
    if (IsKeyDown(VK_RIGHT))
        dx = dx - delta;
    if (IsKeyDown(VK_DOWN))
        dy = dy - delta;
    PanCameraAround(dx, dy);
}
//---------------------------------------------------------------------------
void __fastcall TForm1::FormKeyDown(
    TObject* Sender, WORD &Key, TShiftState Shift)
{
    Key = 0; // all keys handled by Form1
}
//---------------------------------------------------------------------------
void TForm1::PanCameraAround(float dx, float dy)
{
    pitch = pitch + dy;
    yaw = yaw - dx;

    if (pitch > 90)
        pitch = 90;
    if (pitch < -90)
        pitch = -90;
    if (yaw > 360)
        yaw = yaw - 360;
    if (yaw < 0)
        yaw = yaw + 360;

    GLCamera1->Up->SetVector(0, 1, 0);
    GLCamera1->Direction->SetVector(
        sin(DegToRad(yaw)), sin(DegToRad(pitch)), -cos(DegToRad(yaw)));

    LabelPitch->Caption = Format("Pitch: %3f", ARRAYOFCONST((pitch)));
    LabelYaw->Caption = Format("Yaw: %3f", ARRAYOFCONST((yaw)));
}

//---------------------------------------------------------------------------

void __fastcall TForm1::GLSceneViewer1MouseDown(
    TObject* Sender, TMouseButton Button, TShiftState Shift, int X, int Y)
{
    mx = X;
    my = Y;
}
//---------------------------------------------------------------------------
void __fastcall TForm1::GLSceneViewer1MouseMove(
    TObject* Sender, TShiftState Shift, int X, int Y)
{
    float dx, dy, f;
    if (Shift.Contains(ssLeft)) {
        f = 0.2 * 40 / GLCamera1->FocalLength;
        dx = (X - mx) * f;
        dy = (Y - my) * f;
        PanCameraAround(dx, dy);
    }
    mx = X;
    my = Y;
}

//---------------------------------------------------------------------------

//---------------------------------------------------------------------------

void __fastcall TForm1::FormMouseWheel(TObject* Sender, TShiftState Shift,
    int WheelDelta, TPoint &MousePos, bool &Handled)
{
    TrackBar1->Position = TrackBar1->Position + (int)(2 * WheelDelta / 120);
}
//---------------------------------------------------------------------------