// FrHndDlg.cpp : implementation file
//

#include "stdafx.h"
#include "MagGlass.h"
#include "FrHndDlg.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

/////////////////////////////////////////////////////////////////////////////
// CFreeHandDlg dialog


CFreeHandDlg::CFreeHandDlg(CWnd* pParent /*=NULL*/)
	: CDialog(CFreeHandDlg::IDD, pParent)
{
	//{{AFX_DATA_INIT(CFreeHandDlg)
		// NOTE: the ClassWizard will add member initialization here
	//}}AFX_DATA_INIT

   m_nStart = 0;
   m_nPoints = 0;
   m_hFreeHandRgn = NULL;
   m_pPaintWnd = NULL;
   memset(m_pPoints, 0, sizeof(m_pPoints));
}

CFreeHandDlg::~CFreeHandDlg()
{
   if (m_hFreeHandRgn)
   {
      ::DeleteRgn(m_hFreeHandRgn);
      m_hFreeHandRgn = NULL;
   }
}

void CFreeHandDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CFreeHandDlg)
		// NOTE: the ClassWizard will add DDX and DDV calls here
	//}}AFX_DATA_MAP
}


BEGIN_MESSAGE_MAP(CFreeHandDlg, CDialog)
	//{{AFX_MSG_MAP(CFreeHandDlg)
	ON_WM_LBUTTONDOWN()
	ON_WM_MOUSEMOVE()
	ON_WM_LBUTTONUP()
	ON_WM_PAINT()
	ON_BN_CLICKED(IDM_CLEAR, OnClear)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CFreeHandDlg message handlers

BOOL CFreeHandDlg::OnInitDialog() 
{
	CDialog::OnInitDialog();

   RECT PaintWndRect;

   m_pPaintWnd = GetDlgItem(IDC_PAINT);
   if (!m_pPaintWnd)
      return FALSE;

   m_pPaintWnd->GetClientRect(&m_Rect);
   m_pPaintWnd->GetWindowRect(&PaintWndRect);
   m_RectPoint.x = PaintWndRect.left;
   m_RectPoint.y = PaintWndRect.top;
   ScreenToClient(&m_RectPoint);

   return TRUE;  // return TRUE unless you set the focus to a control
	              // EXCEPTION: OCX Property Pages should return FALSE
}

void CFreeHandDlg::OnLButtonDown(UINT nFlags, CPoint point) 
{
   POINT TmpPoint;

   TmpPoint.x = point.x - m_RectPoint.x;
   TmpPoint.y = point.y - m_RectPoint.y;

   if (PtInRect(&m_Rect, TmpPoint) & (m_nStart<1))
   {
      m_PrvPoint.x = TmpPoint.x;
      m_PrvPoint.y = TmpPoint.y;
      m_nStart = 1;
      m_pPoints[m_nPoints].x = TmpPoint.x;
      m_pPoints[m_nPoints].y = TmpPoint.y;
      m_nPoints++;
   }
   SetCapture();

   CDialog::OnLButtonDown(nFlags, point);
}

void CFreeHandDlg::OnMouseMove(UINT nFlags, CPoint point) 
{
   CDC*  pDC;
   POINT TmpPoint;

   TmpPoint.x = point.x - m_RectPoint.x;
   TmpPoint.y = point.y - m_RectPoint.y;

   if (m_nStart == 1)
   {
      if (PtInRect(&m_Rect,TmpPoint) && m_nPoints < 1000)
      {
         m_pPoints[m_nPoints].x = TmpPoint.x;
         m_pPoints[m_nPoints].y = TmpPoint.y;
         m_nPoints++;

         pDC = m_pPaintWnd->GetDC();
         if (pDC)
         {
            pDC->MoveTo(m_PrvPoint.x, m_PrvPoint.y);
            pDC->LineTo(TmpPoint.x, TmpPoint.y);
            m_pPaintWnd->ReleaseDC(pDC);
            m_PrvPoint.x = TmpPoint.x;
            m_PrvPoint.y = TmpPoint.y;
         }
      }
   }

   CDialog::OnMouseMove(nFlags, point);
}

void CFreeHandDlg::OnLButtonUp(UINT nFlags, CPoint point) 
{
   if (m_nStart == 1)
      m_nStart = 2;

   ReleaseCapture();

   CDialog::OnLButtonUp(nFlags, point);
}

void CFreeHandDlg::OnPaint() 
{
   CDC*  pDC = NULL;

   pDC = m_pPaintWnd->GetDC();
   if (pDC)
   {
      if (m_nPoints)
      {
         m_pPaintWnd->InvalidateRect(NULL, TRUE);
         pDC->Polyline(m_pPoints, m_nPoints);
      }
      m_pPaintWnd->ReleaseDC(pDC);
   }
}

void CFreeHandDlg::OnClear() 
{
   memset(m_pPoints, 0, sizeof(m_pPoints));
   m_nPoints = 0;
   m_nStart = 0;
   m_pPaintWnd->InvalidateRect(NULL, TRUE);
   m_pPaintWnd->UpdateWindow();
}

void CFreeHandDlg::OnOK() 
{
   CDialog::OnOK();
   if (m_hFreeHandRgn)
   {
      ::DeleteRgn (m_hFreeHandRgn);
      m_hFreeHandRgn = NULL;
   }

   m_hFreeHandRgn = CreatePolygonRgn(m_pPoints, m_nPoints, WINDING);

   if (!m_hFreeHandRgn)
   {
      AfxMessageBox("Error While creating region!");
   }
}