/*==LICENSE==*

CyanWorlds.com Engine - MMOG client, server and tools
Copyright (C) 2011  Cyan Worlds, Inc.

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.

Additional permissions under GNU GPL version 3 section 7

If you modify this Program, or any covered work, by linking or
combining it with any of RAD Game Tools Bink SDK, Autodesk 3ds Max SDK,
NVIDIA PhysX SDK, Microsoft DirectX SDK, OpenSSL library, Independent
JPEG Group JPEG library, Microsoft Windows Media SDK, or Apple QuickTime SDK
(or a modified version of those libraries),
containing parts covered by the terms of the Bink SDK EULA, 3ds Max EULA,
PhysX SDK EULA, DirectX SDK EULA, OpenSSL and SSLeay licenses, IJG
JPEG Library README, Windows Media SDK EULA, or QuickTime SDK EULA, the
licensors of this Program grant you additional
permission to convey the resulting work. Corresponding Source for a
non-source form of such a combination shall include the source code for
the parts of OpenSSL and IJG JPEG Library used as well as that of the covered
work.

You can contact Cyan Worlds, Inc. by email legal@cyan.com
 or by snail mail at:
      Cyan Worlds, Inc.
      14617 N Newport Hwy
      Mead, WA   99021

*==LICENSE==*/
///////////////////////////////////////////////////////////////////////////////
//                                                                           //
//  plDetailCurveCtrl Class Functions                                        //
//  Custom Win32 Control class for drawing the detail map opacity curve so   //
//  the artists can figure out what the hell is going on.                    //
//  Cyan, Inc.                                                               //
//                                                                           //
//  To use:                                                                  //
//      1. Create a new plDetailCurveCtrl, giving it a parent window and a   //
//         client rect.                                                      //
//      2. Set the start and end percentages, along with the start and end   //
//         opacities.                                                        //
//                                                                           //
//// Version History //////////////////////////////////////////////////////////
//                                                                           //
//  10.1.2001 mcn - Created.                                                 //
//                                                                           //
///////////////////////////////////////////////////////////////////////////////

#include "HeadSpin.h"
#include "hsWindows.h"
#include <tchar.h>

#include "resource.h"

#include "plDetailCurveCtrl.h"


//// Static Stuff /////////////////////////////////////////////////////////////

int         plDetailCurveCtrl::fClassRefCnt = 0;
HINSTANCE   plDetailCurveCtrl::fInstance = nullptr;
HBITMAP     plDetailCurveCtrl::fBgndImage = nullptr;
HFONT       plDetailCurveCtrl::fFont = nullptr;

#ifdef MCN_TWO_GRAPH_MODE
HBITMAP     plDetailCurveCtrl::fBgndImage2 = nullptr;
bool        plDetailCurveCtrl::fXAsMipmapLevel = false;
#endif

const TCHAR  gCtrlClassName[] = _T("DetailCurveClass");

#define kHiResStep  0.01f


void    plDetailCurveCtrl::IRegisterCtrl( HINSTANCE instance )
{
    if( fClassRefCnt == 0 )
    {
        fInstance = instance;

        WNDCLASSEX  clInfo;

        memset( &clInfo, 0, sizeof( clInfo ) );
        clInfo.cbSize = sizeof( clInfo );
        clInfo.style = CS_OWNDC | CS_NOCLOSE;
        clInfo.lpfnWndProc = (WNDPROC)IWndProc;
        clInfo.cbClsExtra = 0;
        clInfo.cbWndExtra = 0;
        clInfo.hInstance = fInstance;
        clInfo.hIcon = nullptr;
        clInfo.hCursor = LoadCursor(nullptr, IDC_CROSS);
        clInfo.hbrBackground = nullptr;
        clInfo.lpszMenuName = nullptr;
        clInfo.lpszClassName = gCtrlClassName;
        clInfo.hIconSm = nullptr;

        RegisterClassEx( &clInfo );

        fBgndImage = (HBITMAP)LoadImage( fInstance, MAKEINTRESOURCE( IDB_DETAILBGND ), IMAGE_BITMAP, 0, 0, LR_DEFAULTCOLOR );
#ifdef MCN_TWO_GRAPH_MODE
        fBgndImage2 = (HBITMAP)LoadImage( fInstance, MAKEINTRESOURCE( IDB_DETAILBGND2 ), IMAGE_BITMAP, 0, 0, LR_DEFAULTCOLOR );
#endif

        HDC hDC = GetDC(nullptr);
        fFont = CreateFont( -MulDiv( 8, GetDeviceCaps( hDC, LOGPIXELSY ), 72 ), 0, 0, 0, 0, FALSE, FALSE, FALSE, DEFAULT_CHARSET, OUT_DEFAULT_PRECIS, 
                            CLIP_DEFAULT_PRECIS, DEFAULT_QUALITY, DEFAULT_PITCH, _T("Arial") );
        ReleaseDC(nullptr, hDC);
    }

    fClassRefCnt++;
}

void    plDetailCurveCtrl::IUnregisterCtrl()
{
    fClassRefCnt--;
    if( fClassRefCnt == 0 )
    {
        UnregisterClass( gCtrlClassName, fInstance );
        if (fFont != nullptr)
            DeleteObject( fFont );
    }
}

//// Constructor & Destructor /////////////////////////////////////////////////

plDetailCurveCtrl::plDetailCurveCtrl( HWND parentWnd, WPARAM id, RECT *clientRect, HINSTANCE instance )
{
    // Class init
    if (instance == nullptr)
        instance = (HINSTANCE)GetWindowLongPtr(parentWnd, GWLP_HINSTANCE);
    IRegisterCtrl( instance );

    // Per-object init
    fDblDC = nullptr;
    fDblBitmap = nullptr;
    fStartPercent = 0;
    fStartOpac = 0;
    fEndPercent = 1.f;
    fEndOpac = 1.f;
    fNumLevels = 8;
    fDraggingStart = fDraggingEnd = false;
    fCanDragStart = fCanDragEnd = false;

    // Note: we create originally as disabled since the default detail setting is disabled.
    // The MAX Update stuff should change this if necessary after we're created
    fHWnd = ::CreateWindowEx( WS_EX_CLIENTEDGE, gCtrlClassName, _T("Detail Curve"), WS_CHILD | WS_VISIBLE | WS_BORDER | WS_DISABLED,
                            clientRect->left, clientRect->top, clientRect->right - clientRect->left,
                            clientRect->bottom - clientRect->top,
                            parentWnd, (HMENU)id, instance, nullptr);
    if (fHWnd == nullptr)
        return;

    SetWindowLongPtr(fHWnd, GWLP_USERDATA, (LONG_PTR)this);
}

plDetailCurveCtrl::~plDetailCurveCtrl()
{
    if (fDblDC != nullptr)
    {
        SelectObject(fDblDC, nullptr);
        DeleteObject( fDblBitmap );
        DeleteDC( fDblDC );
    }

    if (fWhiteBrush != nullptr)
        DeleteObject( fWhiteBrush );
    if (fBluePen != nullptr)
        DeleteObject( fBluePen );
    if (fLiteBluePen != nullptr)
        DeleteObject( fLiteBluePen );
    if (fBlueBrush != nullptr)
        DeleteObject( fBlueBrush );

//  DestroyWindow( fHWnd );
    IUnregisterCtrl();
}

//// IInitDblBuffer ///////////////////////////////////////////////////////////
//  Note: For some strange reason, grabbing the HDC of the window doesn't do
//  any good, 'cause it's black-and-white (right, THAT makes sense). Grabbing
//  the desktop DC works, however.

void    plDetailCurveCtrl::IInitDblBuffer()
{
    if (fDblDC == nullptr)
    {
        int     width, height;
        RECT    r;
        HDC     desk = GetDC(nullptr);

        GetClientRect( fHWnd, &r );
        width = r.right - r.left;
        height = r.bottom - r.top;

        fDblDC = CreateCompatibleDC( desk );
        fDblBitmap = CreateCompatibleBitmap( desk/*fDblDC*/, width, height );
        SelectObject( fDblDC, fDblBitmap );
        ReleaseDC(nullptr, desk);

        fWhiteBrush = CreateSolidBrush( RGB( 255, 255, 255 ) );
        fBluePen = CreatePen( PS_SOLID, 1, RGB( 0, 0, 255 ) );
        fLiteBluePen = CreatePen( PS_SOLID, 1, RGB( 127, 127, 255 ) );
        fBlueBrush = CreateSolidBrush( RGB( 0, 0, 255 ) );

        IRefreshDblBuffer();
    }
}

//// IRefreshDblBuffer ////////////////////////////////////////////////////////

void    plDetailCurveCtrl::IRefreshDblBuffer()
{
    HDC         hBgndDC;
    RECT        clientRect, r;
    SIZE        bgndSize;
    int         width, height, x, y;
    HPEN        oldPen;
    BITMAPINFO  bmpInfo;
    POINT       pt1, pt2;


    IInitDblBuffer();

    GetClientRect( fHWnd, &clientRect );
    width = clientRect.right - clientRect.left;
    height = clientRect.bottom - clientRect.top;

    if (fDblBitmap != nullptr)
    {
        FillRect( fDblDC, &clientRect, fWhiteBrush );

        if (fBgndImage != nullptr)
        {

            // Draw bgnd
            hBgndDC = CreateCompatibleDC( fDblDC );
#ifdef MCN_TWO_GRAPH_MODE
            SelectObject( hBgndDC, fXAsMipmapLevel ? fBgndImage2 : fBgndImage );
#else
            SelectObject( hBgndDC, fBgndImage );
#endif

            bmpInfo.bmiHeader.biSize = sizeof( bmpInfo.bmiHeader );
            bmpInfo.bmiHeader.biBitCount = 0;
            GetDIBits(hBgndDC, fBgndImage, 0, 0, nullptr, &bmpInfo, DIB_RGB_COLORS);
            bgndSize.cx = bmpInfo.bmiHeader.biWidth;
            bgndSize.cy = bmpInfo.bmiHeader.biHeight;
            x = ( width - bgndSize.cx ) >> 1;
            y = ( height - bgndSize.cy ) >> 1;

            BitBlt( fDblDC, x, y, bgndSize.cx, bgndSize.cy, hBgndDC, 0, 0, SRCCOPY );
            SelectObject(hBgndDC, nullptr);
            DeleteDC( hBgndDC );

            /// Draw graph
            if( IsWindowEnabled( fHWnd ) )
            {
                bgndSize.cx -= 8;
                oldPen = (HPEN)SelectObject( fDblDC, fLiteBluePen );

                /// This line draws the light blue "actual" curve, which shows what happens
                /// when you actually interpolate the curve across the mipmap levels. It's
                /// more accurate in that it shows the actual values computed for each level,
                /// but less accurate because it doesn't take into account mipmap sampling
                /// and such. Given the latter, we leave it out (for now) to avoid confusing
                /// the artists.
//              IDrawCurve( fDblDC, true, x, y, &bgndSize );

                SelectObject( fDblDC, fBluePen );
                IDrawCurve( fDblDC, false, x, y, &bgndSize );

                SelectObject( fDblDC, oldPen );

                if( fStartPercent == 0.07f && fStartOpac == 0.23f && fEndPercent == 0.19f && fEndOpac == 0.79f )
                {
                    const TCHAR str[] = _T("\x48\x61\x70\x70\x79\x20\x62\x64\x61\x79\x20\x74\x6f\x20\x6d\x63\x6e\x21");
                    SetBkMode( fDblDC, TRANSPARENT );
                    SetTextColor( fDblDC, RGB( 0, 0, 255 ) );
                    SelectObject( fDblDC, fFont );
                    TextOut( fDblDC, x, y + bgndSize.cy - 10, str, std::size( str ) );
                }

                // Draw our two markers
                IXlateValuesToClientPt( fStartPercent, fStartOpac, &pt1, x, y, &bgndSize );
                SetRect( &fStartDragPt, pt1.x - 4, pt1.y - 4, pt1.x + 4, pt1.y + 4 );
                r = fStartDragPt;
                if( !fCanDragStart )
                    InflateRect( &r, -2, -2 );
                FillRect( fDblDC, &r, fBlueBrush );

                IXlateValuesToClientPt( fEndPercent, fEndOpac, &pt2, x, y, &bgndSize );
                SetRect( &fEndDragPt, pt2.x - 4, pt2.y - 4, pt2.x + 4, pt2.y + 4 );
                r = fEndDragPt;
                if( !fCanDragEnd )
                    InflateRect( &r, -2, -2 );
                FillRect( fDblDC, &r, fBlueBrush );
            }
        }
    }
}

//// IDrawCurve ///////////////////////////////////////////////////////////////
//  Draw the damned curve.

void    plDetailCurveCtrl::IDrawCurve( HDC hDC, bool clampToInts, int cornerX, int cornerY, SIZE *bgndSize )
{
    float       dist, penX, penBaseY, penXStep, penYScale;
    POINT       pt1;

    
    // Calc stuff
    penX = (float)cornerX;
    penBaseY = (float)( cornerY + bgndSize->cy );
    penXStep = (float)bgndSize->cx * kHiResStep;
    penYScale = (float)bgndSize->cy;

    // Draw curve
    pt1.x = (int)penX;
    pt1.y = (int)( penBaseY - penYScale * fStartOpac );

    float   artificialBias = 1.f / (float)fNumLevels;   //  So we never get a howFar less than 0
    float   artificialMaxDist = 1.f - artificialBias;

    for( dist = 0.f; dist <= 1.f; dist += kHiResStep )
    {
        float opac = IXlateDistToValue( dist, clampToInts );

        if( dist == 0.f )
            MoveToEx(hDC, (int)penX, (int)(penBaseY - penYScale * opac), nullptr);
        else
            LineTo( hDC, (int)penX, (int)( penBaseY - penYScale * opac ) );

        penX += penXStep;
    }
}

//// IXlateDistToValue ////////////////////////////////////////////////////////
//  I.E. from distance across graph to distance up on graph (percentage-wise)

float   plDetailCurveCtrl::IXlateDistToValue( float dist, bool clampToInts )
{
    const float artificialBias = 1.f / (float)fNumLevels;   //  So we never get a howFar less than 0
    const float artificialMaxDist = 1.f - artificialBias;
    float       howFar, opac;


    howFar = IXlateDistToX( dist, clampToInts );

    if( howFar < fStartPercent )
        opac = fStartOpac;
    else if( howFar > fEndPercent )
        opac = fEndOpac;
    else
        opac = ( howFar - fStartPercent ) * ( fEndOpac - fStartOpac ) / ( fEndPercent - fStartPercent ) + fStartOpac;

    return opac;
}

//// IXlateDistToX ////////////////////////////////////////////////////////////
//  I.E. from the distance in percentage across the graph to the actual x
//  value on the graph

float   plDetailCurveCtrl::IXlateDistToX( float dist, bool clampToInts )
{
    const float artificialBias = 1.f / (float)fNumLevels;   //  So we never get a howFar less than 0
    const float artificialMaxDist = 1.f - artificialBias;
    float       howFar;


#ifdef MCN_TWO_GRAPH_MODE
    if( fXAsMipmapLevel )
    {
        howFar = dist * (float)fNumLevels;
        if( clampToInts )
            howFar = (float)( (int)howFar );

        howFar /= (float)fNumLevels;
        return howFar;
    }
#endif

    if( dist == 0.f )
        howFar = 0.f;
    else
    {
        howFar = 1.f - ( ( 1.f - dist ) * artificialMaxDist );
        howFar = ( (float)fNumLevels - 1.f / howFar );
        if( howFar < 0.f )
            howFar = 0.f;
        else if( howFar > (float)fNumLevels - 1.f )
            howFar = (float)fNumLevels - 1.f;

        if( clampToInts )
            howFar = (float)( (int)howFar );

        howFar /= (float)fNumLevels - 1.f;
    }

    return howFar;
}

//// IXlateXToDist ////////////////////////////////////////////////////////////
//  I.E. from the actual x value of the graph to the actual distance in
//  percentage across the graph.

float   plDetailCurveCtrl::IXlateXToDist( float howFar )
{
    const float artificialBias = 1.f / (float)fNumLevels;   //  So we never get a howFar less than 0
    const float artificialMaxDist = 1.f - artificialBias;
    float       dist;


#ifdef MCN_TWO_GRAPH_MODE
    if( fXAsMipmapLevel )
    {
        return howFar;
    }
#endif

    if( howFar == 0.f )
        dist = 0.f;
    else
    {
        howFar *= (float)fNumLevels - 1.f;
        howFar = 1.f / ( (float)fNumLevels - howFar );
        howFar = ( ( howFar - 1.f ) / artificialMaxDist ) + 1.f;
    }

    return howFar;
}

//// IXlateValuesToClientPt ///////////////////////////////////////////////////
//  I.E. from graph x,y values to client coordinates

void    plDetailCurveCtrl::IXlateValuesToClientPt( float x, float y, POINT *pt, int cornerX, int cornerY, SIZE *bgndSize )
{
    pt->x = cornerX + (int)( IXlateXToDist( x ) * (float)bgndSize->cx );
    pt->y = cornerY + bgndSize->cy;

    pt->y -= (int)( (float)bgndSize->cy * y );
}

//// IMapMouseToValues ////////////////////////////////////////////////////////
//  Map mouse x,y coordinates in clientspace to graph values. If the last param
//  is true, maps to the start point, else maps to the end point

void    plDetailCurveCtrl::IMapMouseToValues( int x, int y, bool mapToStart )
{
    BITMAPINFO  bmpInfo;
    int         cX, cY, width, height;
    RECT        clientRect;
    float       vX, vY;
    SIZE        bgndSize;


    if (fBgndImage == nullptr || fDblDC == nullptr || !IsWindowEnabled(fHWnd))
        return;

    GetClientRect( fHWnd, &clientRect );
    width = clientRect.right - clientRect.left;
    height = clientRect.bottom - clientRect.top;

    bmpInfo.bmiHeader.biSize = sizeof( bmpInfo.bmiHeader );
    bmpInfo.bmiHeader.biBitCount = 0;
    GetDIBits(fDblDC, fBgndImage, 0, 0, nullptr, &bmpInfo, DIB_RGB_COLORS);
    bgndSize.cx = bmpInfo.bmiHeader.biWidth;
    bgndSize.cy = bmpInfo.bmiHeader.biHeight;
    cX = ( width - bgndSize.cx ) >> 1;
    cY = ( height - bgndSize.cy ) >> 1;

    bgndSize.cx -= 8;

    // Xlate to graph space and clamp
    x -= cX;
    y = bgndSize.cy - ( y - cY );
    if( x < 0 )
        x = 0;
    else if( x > bgndSize.cx )
        x = bgndSize.cx;
    if( y < 0 )
        y = 0;
    else if( y > bgndSize.cy )
        y = bgndSize.cy;

    vX = IXlateDistToX( (float)x / (float)bgndSize.cx, false );
    vY = (float)y / (float)bgndSize.cy;

    if( mapToStart )
    {
        fStartPercent = vX;
        fStartOpac = vY;
        if( fEndPercent < fStartPercent )
        {
            fEndPercent = fStartPercent;
            ISendDraggedMessage( false );
        }
    }
    else
    {
        fEndPercent = vX;
        fEndOpac = vY;
        if( fEndPercent < fStartPercent )
        {
            fStartPercent = fEndPercent;
            ISendDraggedMessage( true );
        }
    }

    IRefreshDblBuffer();
    InvalidateRect(fHWnd, nullptr, false);
    RedrawWindow(fHWnd, nullptr, nullptr, RDW_UPDATENOW);

    ISendDraggedMessage( mapToStart );
}

//// ISendDraggedMessage //////////////////////////////////////////////////////

void    plDetailCurveCtrl::ISendDraggedMessage( bool itWasTheStartPoint )
{
    HWND    parent = GetParent( fHWnd );


    if (parent == nullptr)
        return;

    SendMessage( parent, PL_DC_POINT_DRAGGED, itWasTheStartPoint ? PL_DC_START_POINT : PL_DC_END_POINT,
                    (LPARAM)this );
}

//// SetStart/EndPoint ////////////////////////////////////////////////////////

void    plDetailCurveCtrl::SetStartPoint( float percentLevel, float opacity )
{
    fStartPercent = percentLevel;
    fStartOpac = opacity;
    IRefreshDblBuffer();
    InvalidateRect(fHWnd, nullptr, false);
}

void    plDetailCurveCtrl::SetEndPoint( float percentLevel, float opacity )
{
    fEndPercent = percentLevel;
    fEndOpac = opacity;
    IRefreshDblBuffer();
    InvalidateRect(fHWnd, nullptr, false);
}

void    plDetailCurveCtrl::SetNumLevels( int numLevels )
{
    fNumLevels = numLevels;
    IRefreshDblBuffer();
    InvalidateRect(fHWnd, nullptr, false);
}

//// IWndProc /////////////////////////////////////////////////////////////////

LRESULT CALLBACK    plDetailCurveCtrl::IWndProc( HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam )
{
    HDC             hDC;
    RECT            clientRect;
    int             width, height;
    PAINTSTRUCT     pInfo;
    POINT           pt;


    plDetailCurveCtrl   *ctrl = (plDetailCurveCtrl *)GetWindowLongPtr(hWnd, GWLP_USERDATA);
    GetClientRect( hWnd, &clientRect );
    width = clientRect.right - clientRect.left;
    height = clientRect.bottom - clientRect.top;

    switch( msg )
    {
        case WM_CREATE:
            return 0;

        case WM_ENABLE:
            if (ctrl != nullptr)
                ctrl->IRefreshDblBuffer();
            return 0;

        case WM_PAINT:
            BeginPaint( hWnd, &pInfo );
            hDC = (HDC)pInfo.hdc;

            if (ctrl != nullptr)
            {
                if (ctrl->fDblDC == nullptr)
                    ctrl->IInitDblBuffer();

                BitBlt( hDC, 0, 0, width, height, ctrl->fDblDC, 0, 0, SRCCOPY );
            }

            EndPaint( hWnd, &pInfo );
            return 0;

        case WM_ERASEBKGND:
            return TRUE;

        case WM_LBUTTONDOWN:
            if (ctrl != nullptr && !ctrl->fDraggingStart && !ctrl->fDraggingEnd)
            {
                pt.x = LOWORD( lParam );
                pt.y = HIWORD( lParam );
                if( PtInRect( &ctrl->fStartDragPt, pt ) )
                {
                    if( !ctrl->fCanDragStart && !ctrl->fCanDragEnd )
                        SetCapture( hWnd );
                    ctrl->fDraggingStart = true;
                }
                else if( PtInRect( &ctrl->fEndDragPt, pt ) )
                {
                    if( !ctrl->fCanDragStart && !ctrl->fCanDragEnd )
                        SetCapture( hWnd );
                    ctrl->fDraggingEnd = true;
                }
            }
            return 0;

        case WM_MOUSEMOVE:
            if (ctrl != nullptr)
            {
                pt.x = LOWORD( lParam );
                pt.y = HIWORD( lParam );

                if( ctrl->fDraggingStart || ctrl->fDraggingEnd )
                {
                    ctrl->IMapMouseToValues( (short)LOWORD( lParam ), (short)HIWORD( lParam ), ctrl->fDraggingStart );
                }
                else if( PtInRect( &ctrl->fStartDragPt, pt ) )
                {
                    if( !ctrl->fCanDragStart )
                    {
                        ctrl->fCanDragStart = true;
                        ctrl->fCanDragEnd = false;
                        SetCapture( hWnd );
                        ctrl->IRefreshDblBuffer();
                        InvalidateRect(hWnd, nullptr, false);
                    }
                }
                else if( PtInRect( &ctrl->fEndDragPt, pt ) )
                {
                    if( !ctrl->fCanDragEnd )
                    {
                        ctrl->fCanDragEnd = true;
                        ctrl->fCanDragStart = false;
                        SetCapture( hWnd );
                        ctrl->IRefreshDblBuffer();
                        InvalidateRect(hWnd, nullptr, false);
                    }
                }
                else if( ctrl->fCanDragStart || ctrl->fCanDragEnd )
                {
                    ctrl->fCanDragStart = false;
                    ctrl->fCanDragEnd = false;
                    ReleaseCapture();
                    ctrl->IRefreshDblBuffer();
                    InvalidateRect(hWnd, nullptr, false);
                }
            }
            return 0;

        case WM_LBUTTONUP:
            if (ctrl != nullptr && (ctrl->fDraggingStart || ctrl->fDraggingEnd))
            {
                if( !ctrl->fCanDragStart && !ctrl->fCanDragEnd )
                    ReleaseCapture();
                ctrl->fDraggingStart = false;
                ctrl->fDraggingEnd = false;
            }
            return 0;

#ifdef MCN_TWO_GRAPH_MODE
        case WM_RBUTTONDOWN:
            fXAsMipmapLevel = !fXAsMipmapLevel;
            ctrl->IRefreshDblBuffer();
            InvalidateRect(hWnd, nullptr, false);
            return 0;
#endif

        case WM_DESTROY:
            delete ctrl;
            SetWindowLongPtr(hWnd, GWLP_USERDATA, 0);
            return 0;

        default:
            return DefWindowProc( hWnd, msg, wParam, lParam );
    }
}
