//---------------------------------------------------------------------------

#include <vcl.h>
#pragma hdrstop

#include "Unit_Magnifying.h"
#include "Unit_Main.h"
#include "Unit_Task.h"
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"

TMagnifying        *Magnifying;

//---------------------------------------------------------------------------

__fastcall TMagnifying::TMagnifying(TComponent* Owner) : TForm(Owner)
{
}

//---------------------------------------------------------------------------

void __fastcall TMagnifying::FormCreate(TObject *Sender)
{

 // Bitmap 생성
 MAGNIFYING   = new Graphics::TBitmap();
 ZOOMVALUE    = 2;

 CURSOR_GAB_X = DEFAULT_CURSOR_GAB_X;
 CURSOR_GAB_Y = DEFAULT_CURSOR_GAB_Y;

 DoubleBuffered = true;

 SetWindowSize();
 
}

//---------------------------------------------------------------------------

void __fastcall TMagnifying::SetWindowSize()
{

 MAGNIFYING->Width  = _imMagnifying->Width  / ZOOMVALUE;
 MAGNIFYING->Height = _imMagnifying->Height / ZOOMVALUE;

}

//---------------------------------------------------------------------------

void __fastcall TMagnifying::FormDestroy(TObject *Sender)
{

 delete MAGNIFYING;

}

//---------------------------------------------------------------------------

void __fastcall TMagnifying::_tiTickTimer(TObject *Sender)
{

 tagPOINT          tpPosition;
 HWND              itDC;
 int               itSourceX, itSourceY, itWinX, itWinY, itWindowPosition;
 int               itSwapSpace;        // 좌표가 바뀌면 연산을 한번 더 함
 int               itMagnifyX, itMagnifyY;
 TCursor           tcCursor;


/*
 화면 좌표에 대하여 바꾸는 루틴
 int               POSITION[4][2] = { 20, Main->_imToolbarL->Height + 15,
                                      Screen->Width - Magnifying->Width - 30, Main->_imToolbarL->Height + 10,
                                      20, Screen->Height - Magnifying->Height - Task->Height - 35,
                                      Screen->Width - Magnifying->Width - 30, Screen->Height - Magnifying->Height - Task->Height - 35};
*/

 GetCursorPos(&tpPosition);

 if(PREVIOUS_X != tpPosition.x || PREVIOUS_Y != tpPosition.y) {
   PREVIOUS_X = tpPosition.x;
   PREVIOUS_Y = tpPosition.y;


/*
 화면 좌표에 대하여 바꾸는 루틴
   // 윈도우 위치 설정
   itWindowPosition = 0;
   if(PREVIOUS_X < Screen->Width  / 2) itWindowPosition = itWindowPosition | 1;
                                  else itWindowPosition = itWindowPosition | 0;
   if(PREVIOUS_Y < Screen->Height / 2) itWindowPosition = itWindowPosition | 2;
                                  else itWindowPosition = itWindowPosition | 0;

   Magnifying->Left = POSITION[itWindowPosition][0];
   Magnifying->Top  = POSITION[itWindowPosition][1];
*/

   itWinX      = PREVIOUS_X + MAGNIFYING_INTERVAL;
   itWinY      = PREVIOUS_Y + MAGNIFYING_INTERVAL;
   itSwapSpace = 0;

   if(itWinX + Magnifying->Width  > Screen->Width)
     itWinX = PREVIOUS_X - Magnifying->Width - MAGNIFYING_INTERVAL;
   if(itWinY + Magnifying->Height + Task->Height + 10 > Screen->Height) {
     itWinY = PREVIOUS_Y - Magnifying->Height - MAGNIFYING_INTERVAL;
     // 윈도우가 더이상 내려가지 않게 하는 위치에서, 윈도우 위치가 마우스
     // 커서 위치로 인하여 바뀌게 되면, 연산을 바뀐 위치만큼 더 해주어야 한다
     itSwapSpace = MAGNIFYING->Height;
   }


   if(itWinX < MAGNIFYING->Width)  itWinX = MAGNIFYING->Width;
   if(itWinY < MAGNIFYING->Height) itWinY = MAGNIFYING->Height;
   if(itWinY > Screen->Height - Task->Height - Magnifying->Height - itSwapSpace)
     itWinY = Screen->Height - Task->Height - Magnifying->Height - itSwapSpace;

   Magnifying->Left = itWinX;
   Magnifying->Top  = itWinY;


   // 화면을 캡쳐한 후 Zoom 시킴
   itSourceX = PREVIOUS_X - (_imMagnifying->Width  / 2 / ZOOMVALUE);
   itSourceY = PREVIOUS_Y - (_imMagnifying->Height / 2 / ZOOMVALUE);

   if(itSourceX < 0) itSourceX = 0;
   if(itSourceY < 0) itSourceY = 0;
   if(itSourceX + MAGNIFYING->Width  > Screen->Width)  itSourceX = Screen->Width  - MAGNIFYING->Width;
   if(itSourceY + MAGNIFYING->Height > Screen->Height) itSourceY = Screen->Height - MAGNIFYING->Height;
   

   itMagnifyX = ((PREVIOUS_X - itSourceX) * ZOOMVALUE) + _imMagnifying->Left;
   itMagnifyY = ((PREVIOUS_Y - itSourceY) * ZOOMVALUE) + _imMagnifying->Top;

   itDC = GetDC(0);
   BitBlt(MAGNIFYING->Canvas->Handle, 0, 0,
          MAGNIFYING->Width, MAGNIFYING->Height, itDC,
          itSourceX, itSourceY,
          SRCCOPY);
   ReleaseDC(0, itDC);

   _imMagnifying->Picture->Bitmap->Assign(MAGNIFYING);

   
   _imMagnifying->Picture->Bitmap->Canvas->Draw(
     (itMagnifyX / ZOOMVALUE - 15) + CURSOR_GAB_X,
     (itMagnifyY / ZOOMVALUE - 15) + CURSOR_GAB_Y,
     _imCursor->Picture->Graphic
   );

// 커서를 다시 그리는 루틴
// OS에 따라 틀려진다는 단점이 있음
/*
   DrawIcon(_imMagnifying->Picture->Bitmap->Canvas->Handle,
            (itMagnifyX / ZOOMVALUE - 15) + CURSOR_GAB_X,
            (itMagnifyY / ZOOMVALUE - 15) + CURSOR_GAB_Y,
            LoadCursor(HInstance, IDC_ARROW));
*/
 }

}

//---------------------------------------------------------------------------