/********************************/
/* Low level graphics routines  */
/********************************/


#include "fctsys.h"
#include "gr_basic.h"
#include "common.h"
#include "trigo.h"
#include "macros.h"
#include "base_struct.h"
#include "class_base_screen.h"

#ifndef FILLED
#define FILLED 1
#endif

/* Important Note:
 * These drawing functions  clip draw item before send these items to wxDC draw functions.
 * For guy who aks why i did it, see a sample of problems encounted when pixels
 * coordinates overflow 16 bits values:
 * http://trac.wxwidgets.org/ticket/10446
 * Problems can be found under Windows **and** Linux (mainly when drawing arcs)
 * (mainly at low zoom values (2, 1 or 0.5), in pcbnew)
 * some of these problems could be now fixed in recent distributions.
 *
 * Currently (feb 2009) there are overflow problems when drawing solid (filled) polygons under linux without clipping
 *
 * So before removing cliping functions, be aware these bug (they are not in kicad or wxWidgets)
 * are fixed by testing how are drawn complex lines arcs and solid polygons under Windows and Linux
 * and remember users can have old versions with bugs
 */

/* variables generales */

// pour les tracés en mode XOR = GR_XOR ou GR_NXOR selon couleur de fond
int g_XorMode = GR_NXOR;
// couleur de fond de la frame de dessin
int g_DrawBgColor = WHITE;


#define USE_CLIP_FILLED_POLYGONS

#ifdef USE_CLIP_FILLED_POLYGONS
void ClipAndDrawFilledPoly( EDA_Rect * ClipBox, wxDC * DC, wxPoint Points[], int n );
#endif

/* global variables */
extern BASE_SCREEN* ActiveScreen;

/* Variables locales */
static int   GRLastMoveToX, GRLastMoveToY;
static int   PenMinWidth = 1; /* largeur minimum de la plume (DOIT etre > 0)
                               *  (utile pour trace sur imprimante) */
static bool  ForceBlackPen;   /* si != 0 : traces en noir (utilise pour trace
                               *  sur imprimante */
static int   xcliplo = 0,
             ycliplo = 0,
             xcliphi = 2000,
             ycliphi = 2000;     /* coord de la surface de trace */
static int   lastcolor      = -1;
static int   lastwidth      = -1;
static int   s_Last_Pen_Style = -1;
static wxDC* lastDC = NULL;

/*
 *  Macro de clipping du trace d'une ligne:
 *  la ligne (x1,y1 x2,y2) est clippee pour rester dans le cadre
 *  (xcliplo,ycliplo xcliphi,ycliphi) (variables globales,locales a ce fichier)
 *  Ceci est necessaire sous WIN95 car les coord de trace
 *  (bien que en int 32bits) sont tronquees en 16 bits (stupide BG)
 */
#ifndef us
#define us unsigned int
#endif

static inline int USCALE( us arg, us num, us den )
{
#ifndef WX_ZOOM
    int ii;
    ii = (int) ( ( (float) arg * num ) / den );
    return ii;
#else
    return arg;
#endif
}


static int inline ZoomValue( int val )
{
    return ActiveScreen->Scale( val );
}


/****************************************/
/* External reference for the mappings. */
/****************************************/
int GRMapX( int x )
{
#ifndef WX_ZOOM
    int coord = x - ActiveScreen->m_DrawOrg.x;
    coord  = ZoomValue( coord );
    coord -= ActiveScreen->m_StartVisu.x;
    return coord;
#else
    return x;
#endif
}


int GRMapY( int y )
{
#ifndef WX_ZOOM
    int coord = y - ActiveScreen->m_DrawOrg.y;
    coord  = ZoomValue( coord );
    coord -= ActiveScreen->m_StartVisu.y;
    return coord;
#else
    return y;
#endif
}


#define WHEN_OUTSIDE return true;
#define WHEN_INSIDE


/**
 * Function clip_line
 * @return bool - true when WHEN_OUTSIDE fires, else false.
 */
static inline bool clip_line( int& x1, int& y1, int& x2, int& y2 )
{
    int temp;

    if( x1 > x2 )
    {
        EXCHG( x1, x2 );
        EXCHG( y1, y2 );
    }
    if( (x2 < xcliplo) || (x1 > xcliphi) )
    {
        WHEN_OUTSIDE;
    }
    if( y1 < y2 )
    {
        if( (y2 < ycliplo) || (y1 > ycliphi) )
        {
            WHEN_OUTSIDE;
        }
        if( y1 < ycliplo )
        {
            temp = USCALE( (x2 - x1), (ycliplo - y1), (y2 - y1) );
            if( (x1 += temp) > xcliphi )
            {
                WHEN_OUTSIDE;
            }
            y1 = ycliplo;
            WHEN_INSIDE;
        }
        if( y2 > ycliphi )
        {
            temp = USCALE( (x2 - x1), (y2 - ycliphi), (y2 - y1) );
            if( (x2 -= temp) < xcliplo )
            {
                WHEN_OUTSIDE;
            }
            y2 = ycliphi;
            WHEN_INSIDE;
        }
        if( x1 < xcliplo )
        {
            temp = USCALE( (y2 - y1), (xcliplo - x1), (x2 - x1) );
            y1  += temp;
            x1   = xcliplo;
            WHEN_INSIDE;
        }
        if( x2 > xcliphi )
        {
            temp = USCALE( (y2 - y1), (x2 - xcliphi), (x2 - x1) );
            y2  -= temp;
            x2   = xcliphi;
            WHEN_INSIDE;
        }
    }
    else
    {
        if( (y1 < ycliplo) || (y2 > ycliphi) )
        {
            WHEN_OUTSIDE;
        }
        if( y1 > ycliphi )
        {
            temp = USCALE( (x2 - x1), (y1 - ycliphi), (y1 - y2) );
            if( (x1 += temp) > xcliphi )
            {
                WHEN_OUTSIDE;
            }
            y1 = ycliphi;
            WHEN_INSIDE;
        }
        if( y2 < ycliplo )
        {
            temp = USCALE( (x2 - x1), (ycliplo - y2), (y1 - y2) );
            if( (x2 -= temp) < xcliplo )
            {
                WHEN_OUTSIDE;
            }
            y2 = ycliplo;
            WHEN_INSIDE;
        }
        if( x1 < xcliplo )
        {
            temp = USCALE( (y1 - y2), (xcliplo - x1), (x2 - x1) );
            y1  -= temp;
            x1   = xcliplo;
            WHEN_INSIDE;
        }
        if( x2 > xcliphi )
        {
            temp = USCALE( (y1 - y2), (x2 - xcliphi), (x2 - x1) );
            y2  += temp;
            x2   = xcliphi;
            WHEN_INSIDE;
        }
    }

    return false;
}


static void WinClipAndDrawLine( EDA_Rect* ClipBox, wxDC* DC,
                                int x1, int y1, int x2, int y2,
                                int Color, int width = 1 )
{
    GRLastMoveToX = x2;
    GRLastMoveToY = y2;

    if( ClipBox )
    {
        xcliplo = ClipBox->GetX();
        ycliplo = ClipBox->GetY();
        xcliphi = ClipBox->GetRight();
        ycliphi = ClipBox->GetBottom();

        xcliplo -= width;
        ycliplo -= width;

        xcliphi += width;
        ycliphi += width;

        if( clip_line( x1, y1, x2, y2 ) )
            return;
    }

    GRSetColorPen( DC, Color, width );
    DC->DrawLine( x1, y1, x2, y2 );
}


/* Routine de forcage de la reinit de la plume courante.
 *  Doit etre appelee par securite apres changement de contexte graphique
 *  avant tout trace
 */
void GRResetPenAndBrush( wxDC* DC )
{
    lastcolor = -1;
    GRSetBrush( DC, BLACK );  // Force no fill
    lastDC = NULL;
}


/* routine d'ajustage de la largeur mini de plume */
void SetPenMinWidth( int minwidth )
{
    PenMinWidth = minwidth;
    if( PenMinWidth < 1 )
        PenMinWidth = 1;
}


/**
 * Function GRSetColorPen
 * sets a pen style, width, color, and alpha into the given device context.
 */
void GRSetColorPen( wxDC* DC, int Color, int width, int style )
{
    if( width < PenMinWidth )
        width = PenMinWidth;

    if( ForceBlackPen )
    {
        Color = BLACK;
    }

    if(   lastcolor != Color
          || lastwidth != width
          || s_Last_Pen_Style != style
          || lastDC != DC  )
    {
        wxPen    pen;

        wxColour wx_color = MakeColour( Color );

        pen.SetColour( wx_color );
        pen.SetWidth( width );
        pen.SetStyle( style );

        DC->SetPen( pen );

        lastcolor = Color;
        lastwidth = width;
        lastDC    = DC;

        s_Last_Pen_Style = style;
    }
}


/***********************************************/
void GRSetBrush( wxDC* DC, int Color, int fill )
/***********************************************/
{
    if( ForceBlackPen )
        Color = BLACK;
    wxBrush DrawBrush;
    DrawBrush.SetColour( MakeColour( Color ) );

    if( fill )
        DrawBrush.SetStyle( wxSOLID );
    else
        DrawBrush.SetStyle( wxTRANSPARENT );
    DC->SetBrush( DrawBrush );
}


/*************************************/
void GRForceBlackPen( bool flagforce )
/*************************************/

/** function GRForceBlackPen
 * @param flagforce True to force a black pen whenever the asked color
 */
{
    ForceBlackPen = flagforce;
}


/***********************************/
bool GetGRForceBlackPenState( void )
/***********************************/

/** function GetGRForceBlackPenState
 * @return ForceBlackPen (True if  a black pen was forced)
 */
{
    return ForceBlackPen;
}


/**********************************************/
/* Routine pour selectionner le mode de trace */
/**********************************************/
void GRSetDrawMode( wxDC* DC, int draw_mode )
{
    if( draw_mode & GR_OR )
#if defined(__WXMAC__) && wxMAC_USE_CORE_GRAPHICS
        DC->SetLogicalFunction( wxCOPY );
#else
        DC->SetLogicalFunction( wxOR );
#endif
    else if( draw_mode & GR_XOR )
        DC->SetLogicalFunction( wxXOR );
    else if( draw_mode & GR_NXOR )
#if defined (__WXMAC__) && wxMAC_USE_CORE_GRAPHICS
    DC->SetLogicalFunction( wxXOR );
#else
    DC->SetLogicalFunction( wxEQUIV );
#endif
   else
        DC->SetLogicalFunction( wxCOPY );
}


/*********************************************************************/
void GRPutPixel( EDA_Rect* ClipBox, wxDC* DC, int x, int y, int Color )
/*********************************************************************/
{
    GRSPutPixel( ClipBox, DC, GRMapX( x ), GRMapY( y ), Color );
}


/********************************************************************/
void GRSPutPixel( EDA_Rect* ClipBox, wxDC* DC, int x, int y, int Color )
/********************************************************************/
{
    if( ClipBox && !ClipBox->Inside( x, y ) )
        return;

    GRSetColorPen( DC, Color );
    DC->DrawPoint( x, y );
}


/*******************************************/
/* int GRGetPixel(wxDC * DC, int x, int y) */
/*******************************************/

int GRGetPixel( wxDC* DC, int x, int y )
{
    wxColour      colour;
    unsigned char r, g, b;
    int           ii;

    DC->GetPixel( (long) x, (long) y, &colour );
    r = colour.Red();
    b = colour.Blue();
    g = colour.Green();
    for( ii = 0; ii < NBCOLOR; ii++ )
    {
        if( ( r == ColorRefs[ii].m_Red )
           && ( g == ColorRefs[ii].m_Green )
           && ( b == ColorRefs[ii].m_Blue ) )
            break;
    }

    return ii;
}


/****************************************************************************
* Routine to draw a line, in Object spaces.						  *
****************************************************************************/
void GRLine( EDA_Rect* ClipBox, wxDC* DC, int x1, int y1, int x2, int y2, int width, int Color )
{
    GRSLine( ClipBox, DC, GRMapX( x1 ), GRMapY( y1 ), GRMapX( x2 ), GRMapY( y2 ), ZoomValue(
                 width ), Color );
}

void GRLine(EDA_Rect * aClipBox, wxDC * aDC, wxPoint aStart, wxPoint aEnd, int aWidth, int aColor)
{
    GRSLine( aClipBox, aDC, GRMapX( aStart.x ), GRMapY( aStart.y ), GRMapX( aEnd.x ), GRMapY( aEnd.y ),
            ZoomValue( aWidth ), aColor );
}

/***************************************************/
/* Routine to draw a Dashed line, in Screen space. */
/***************************************************/
void GRSDashedLine( EDA_Rect* ClipBox,
                    wxDC*     DC,
                    int       x1,
                    int       y1,
                    int       x2,
                    int       y2,
                    int       width,
                    int       Color )
{
    GRLastMoveToX = x2;
    GRLastMoveToY = y2;
    lastcolor     = -1;
    GRSetColorPen( DC, Color, width, wxSHORT_DASH );
    GRSLine( ClipBox, DC, x1, y1, x2, y2, width, Color );
    lastcolor = -1;
    GRSetColorPen( DC, Color, width );
}


void GRSDashedLineTo( EDA_Rect* ClipBox, wxDC* DC, int x2, int y2, int width, int Color )
{
    lastcolor = -1;
    GRSetColorPen( DC, Color, width, wxSHORT_DASH );
    GRSLine( ClipBox, DC, GRLastMoveToX, GRLastMoveToY, x2, y2, width, Color );
    lastcolor = -1;
    GRSetColorPen( DC, Color, width );
    GRLastMoveToX = x2;
    GRLastMoveToY = y2;
}


/****************************************************************************
* Routine to draw a Dashed line, in Object spaces.						  *
****************************************************************************/
void GRDashedLineTo( EDA_Rect* ClipBox, wxDC* DC, int x2, int y2, int width, int Color )
{
    GRSDashedLineTo( ClipBox, DC, GRMapX( x2 ), GRMapY( y2 ), ZoomValue( width ), Color );
}


void GRDashedLine( EDA_Rect* ClipBox,
                   wxDC*     DC,
                   int       x1,
                   int       y1,
                   int       x2,
                   int       y2,
                   int       width,
                   int       Color )
{
    GRSDashedLine( ClipBox, DC, GRMapX( x1 ), GRMapY( y1 ), GRMapX( x2 ), GRMapY( y2 ),
                   ZoomValue( width ), Color );
}


/****************************************************************************
* Routine to move to a new position, in Object space.				*
****************************************************************************/
void GRMoveTo( int x, int y )
{
    GRLastMoveToX = GRMapX( x );
    GRLastMoveToY = GRMapY( y );
}


/*******************************************************/
/* Routine to draw to a new position, in Object space. */
/*******************************************************/
void GRLineTo( EDA_Rect* ClipBox, wxDC* DC, int x, int y, int width, int Color )
{
    int GRLineToX, GRLineToY;

    GRLineToX = GRMapX( x ); GRLineToY = GRMapY( y );
    GRSLine( ClipBox, DC, GRLastMoveToX, GRLastMoveToY, GRLineToX, GRLineToY, ZoomValue(
                 width ), Color );
}


/*************************************************/
/* Routine to draw a Mixed line, in Object space */
/*************************************************/
void GRMixedLine( EDA_Rect* ClipBox,
                  wxDC*     DC,
                  int       x1,
                  int       y1,
                  int       x2,
                  int       y2,
                  int       width,
                  int       Color )
{
    GRSMixedLine( ClipBox, DC, GRMapX( x1 ), GRMapY( y1 ), GRMapX( x2 ), GRMapY( y2 ),
                  ZoomValue( width ), Color );
}


/***********************************************************/
/* Routine to draw a Mixed line, in Screen (Pixels)  space */
/***********************************************************/
void GRSMixedLine( EDA_Rect* ClipBox,
                   wxDC*     DC,
                   int       x1,
                   int       y1,
                   int       x2,
                   int       y2,
                   int       width,
                   int       Color )
{
    GRSetColorPen( DC, Color, width, wxDOT_DASH );
    GRSLine( ClipBox, DC, x1, y1, x2, y2, width, Color );
    GRSetColorPen( DC, Color, width );
}


/****************************************************************************
* Routine to move to a new position, in Screen (pixels) space.			*
****************************************************************************/
void GRSMoveTo( int x, int y )
{
    GRLastMoveToX = x;
    GRLastMoveToY = y;
}


/****************************************************************************
* Routine to draw to a new position, in Screen (pixels) space.			*
****************************************************************************/
void GRSLineTo( EDA_Rect* ClipBox, wxDC* DC, int x, int y, int width, int Color )
{
    GRSLine( ClipBox, DC, GRLastMoveToX, GRLastMoveToY, x, y, width, Color );
    GRLastMoveToX = x; GRLastMoveToY = y;
}


/****************************************************************************
* Routine to draw to a new position, in Screen (pixels) space.			*
****************************************************************************/
void GRSLine( EDA_Rect* ClipBox, wxDC* DC, int x1, int y1, int x2, int y2, int width, int Color )
{
    WinClipAndDrawLine( ClipBox, DC, x1, y1, x2, y2, Color, width );
    GRLastMoveToX = x2; GRLastMoveToY = y2;
}


/****************************************************************************/
/* Routine to move to a new position relative to current one, as in Object	*/
/* space.																	*/
/****************************************************************************/
void GRMoveRel( int x, int y )
{
    GRLastMoveToX += ZoomValue( x );
    GRLastMoveToY += ZoomValue( y );
}


/****************************************************************************
* Routine to line to a new position relative to current one, as in Object	*
* space.									*
****************************************************************************/
void GRLineRel( EDA_Rect* ClipBox, wxDC* DC, int x, int y, int width, int Color )
{
    int GRLineToX = GRLastMoveToX,
        GRLineToY = GRLastMoveToY;

    GRLineToX += ZoomValue( x );
    GRLineToY += ZoomValue( y );

    GRSLine( ClipBox, DC, GRLastMoveToX, GRLastMoveToY, GRLineToX, GRLineToY, ZoomValue(
                 width ), Color );
}


/****************************************************************************
* Routine to move to a new position relative to current one, as in Screen	*
* space (pixel coords.).							  *
****************************************************************************/
void GRSMoveRel( int x, int y )
{
    GRLastMoveToX += x;
    GRLastMoveToY += y;
}


/****************************************************************************
* Routine to line to a new position relative to current one, as in Screen	*
* space (pixel coords.).							  *
****************************************************************************/
void GRSLineRel( EDA_Rect* ClipBox, wxDC* DC, int x, int y, int width, int Color )
{
    long GRLineToX = GRLastMoveToX + x,
         GRLineToY = GRLastMoveToY + y;

    GRSLine( ClipBox, DC, GRLastMoveToX, GRLastMoveToY, GRLineToX, GRLineToY, width, Color );
    GRLastMoveToX = GRLineToX;
    GRLastMoveToY = GRLineToY;
}


/**************************************************/
/* Routine de trace d'un segment a bouts arrondis */
/* Object space  = real coords.).				  */
/**************************************************/
void GRCSegm( EDA_Rect* ClipBox, wxDC* DC, int x1, int y1, int x2, int y2,
              int width, int Color )
{
    GRSCSegm( ClipBox, DC, GRMapX( x1 ), GRMapY( y1 ), GRMapX( x2 ), GRMapY( y2 ),
              ZoomValue( width ), Color );
}


/*******************************************************************
 * Routine de trace d'un segment (plein) a bouts arrondis in Object *
 * space (real coords.).												 *
 ********************************************************************/
void GRFillCSegm( EDA_Rect* ClipBox, wxDC* DC, int x1, int y1, int x2, int y2,
                  int width, int Color )
{
    GRSFillCSegm( ClipBox, DC, GRMapX( x1 ), GRMapY( y1 ), GRMapX( x2 ), GRMapY( y2 ),
                  ZoomValue( width ), Color );
}


/**********************************************************/
/* Routine de trace d'un segment (plein) a bouts arrondis */
/* ( Screen  space = pixel coords.).					  */
/**********************************************************/

void GRSFillCSegm( EDA_Rect* ClipBox,
                   wxDC*     DC,
                   int       x1,
                   int       y1,
                   int       x2,
                   int       y2,
                   int       width,
                   int       Color )
{
    WinClipAndDrawLine( ClipBox, DC, x1, y1, x2, y2, Color, width );
}


/****************************************************************/
/* Routine de trace d'un segment a bouts arrondis (Mode SKETCH) */
/* Screen space (pixel coords.).								*/
/****************************************************************/
void GRSCSegm( EDA_Rect* ClipBox, wxDC* DC, int x1, int y1, int x2, int y2, int width, int Color )
{
    long rayon;
    int  dwx, dwy;
    long dx, dy, dwx2, dwy2;
    long sx1, sy1, ex1, ey1;    /* coord du 1er bord */
    long sx2, sy2, ex2, ey2;    /* coord du 1eme bord */
    bool swap_ends = FALSE;


    GRLastMoveToX = x2;
    GRLastMoveToY = y2;

    if( ClipBox )
    {
        xcliplo = ClipBox->GetX();
        ycliplo = ClipBox->GetY();
        xcliphi = ClipBox->GetRight();
        ycliphi = ClipBox->GetHeight();

        xcliplo -= width;
        ycliplo -= width;

        xcliphi += width;
        ycliphi += width;

        if( clip_line( x1, y1, x2, y2 ) )
            return;
    }


    if( width <= 2 )   /* ligne simple ou epaisse de 2 pixels*/
    {
        GRSetColorPen( DC, Color, width );
        DC->DrawLine( x1, y1, x2, y2 );
        return;
    }

    GRSetColorPen( DC, Color );
    GRSetBrush( DC, Color, FALSE );

    rayon = (width + 1) >> 1;

    dx = x2 - x1;
    dy = y2 - y1;

    if( dx == 0 )  /* segment vertical */
    {
        dwx = rayon;
        if( dy >= 0 )
            dwx = -dwx;

        sx1 = x1 - dwx;
        sy1 = y1;

        ex1 = x2 - dwx;
        ey1 = y2;

        DC->DrawLine( sx1, sy1, ex1, ey1 );

        sx2 = x1 + dwx;
        sy2 = y1;

        ex2 = x2 + dwx;
        ey2 = y2;

        DC->DrawLine( sx2, sy2, ex2, ey2 );
    }
    else if( dy == 0 ) /* segment horizontal */
    {
        dwy = rayon;
        if( dx < 0 )
            dwy = -dwy;

        sx1 = x1;
        sy1 = y1 - dwy;

        ex1 = x2;
        ey1 = y2 - dwy;

        DC->DrawLine( sx1, sy1, ex1, ey1 );

        sx2 = x1;
        sy2 = y1 + dwy;

        ex2 = x2;
        ey2 = y2 + dwy;

        DC->DrawLine( sx2, sy2, ex2, ey2 );
    }
    else
    {
        if( ABS( dx ) == ABS( dy ) )                /* segment a 45 degre */
        {
            dwx = dwy = ( (width * 5) + 4 ) / 7;    // = width/2 * 0.707
            if( dy < 0 )
            {
                if( dx <= 0 )
                {
                    dwx = -dwx; swap_ends = TRUE;
                }
            }
            else
            {
                if( dx > 0 )
                {
                    dwy = -dwy; swap_ends = TRUE;
                }
            }
        }
        else
        {
            int delta_angle = ArcTangente( dy, dx );
            dwx = 0;
            dwy = width;
            RotatePoint( &dwx, &dwy, -delta_angle );
        }
        dwx2 = dwx >> 1;
        dwy2 = dwy >> 1;

        sx1 = x1 - dwx2;
        sy1 = y1 - dwy2;

        ex1 = x2 - dwx2;
        ey1 = y2 - dwy2;

        DC->DrawLine( sx1, sy1, ex1, ey1 );

        sx2 = x1 + dwx2;
        sy2 = y1 + dwy2;

        ex2 = x2 + dwx2;
        ey2 = y2 + dwy2;

        DC->DrawLine( sx2, sy2, ex2, ey2 );
    }

    if( swap_ends )
    {
        DC->DrawArc( sx2, sy2, sx1, sy1, x1, y1 );
        DC->DrawArc( ex1, ey1, ex2, ey2, x2, y2 );
    }
    else
    {
        DC->DrawArc( sx1, sy1, sx2, sy2, x1, y1 );
        DC->DrawArc( ex2, ey2, ex1, ey1, x2, y2 );
    }
}


static bool IsGRSPolyDrawable( EDA_Rect* ClipBox, int n, wxPoint Points[] )
{
    int Xmin, Xmax, Ymin, Ymax;

    Xmin = Xmax = Points[0].x;
    Ymin = Ymax = Points[0].y;

    for( int ii = 1; ii < n; ii++ )     // calcul du rectangle d'encadrement
    {
        Xmin = MIN( Xmin, Points[ii].x );
        Xmax = MAX( Xmax, Points[ii].x );
        Ymin = MIN( Ymin, Points[ii].y );
        Ymax = MAX( Ymax, Points[ii].y );
    }

    xcliplo = ClipBox->GetX();
    ycliplo = ClipBox->GetY();
    xcliphi = ClipBox->GetRight();
    ycliphi = ClipBox->GetBottom();

    if( Xmax < xcliplo )
        return FALSE;
    if( Xmin > xcliphi )
        return FALSE;
    if( Ymax < ycliplo )
        return FALSE;
    if( Ymin > ycliphi )
        return FALSE;

    return TRUE;
}


/************************************************************************/
/* Routine to draw a new polyline and fill it if Fill, in screen space. */
/************************************************************************/
static void GRSPoly( EDA_Rect* ClipBox, wxDC* DC, int n, wxPoint Points[], bool Fill,
                     int width, int Color, int BgColor )
{
    if( !IsGRSPolyDrawable( ClipBox, n, Points ) )
        return;

    GRSetColorPen( DC, Color, width );

    if( Fill && ( n > 2 ) )
    {
        GRSetBrush( DC, BgColor, FILLED );


        /* clip before send the filled polygon to wxDC, because under linux (GTK?)
         *  polygonsl having large coordinates are incorrectly drawn
         */
#ifdef USE_CLIP_FILLED_POLYGONS
        ClipAndDrawFilledPoly( ClipBox, DC, Points, n );
#else
         DC->DrawPolygon( n, Points ); //does not work very well under linux
#endif
    }
    else
    {
        wxPoint endPt = Points[n - 1];

        GRSetBrush( DC, Color );
        DC->DrawLines( n, Points );

        // The last point is not drawn by DrawLine and DrawLines
        // Add it if the polygon is not closed
        if( endPt != Points[0] )
            DC->DrawPoint( endPt.x, endPt.y );
    }
}


/******************************************************************************/
/* Routine to draw a new closed polyline and fill it if Fill, in screen space */
/******************************************************************************/
static void GRSClosedPoly( EDA_Rect* ClipBox, wxDC* DC, int aPointCount, wxPoint aPoints[],
                           bool Fill, int width, int Color, int BgColor )
{
    if( !IsGRSPolyDrawable( ClipBox, aPointCount, aPoints ) )
        return;

    GRSetColorPen( DC, Color, width );

    if( Fill && ( aPointCount > 2 ) )
    {
        GRSMoveTo( aPoints[aPointCount - 1].x, aPoints[aPointCount - 1].y );
        GRSetBrush( DC, BgColor, FILLED );
        DC->DrawPolygon( aPointCount, aPoints, 0, 0, wxODDEVEN_RULE );
    }
    else
    {
        GRSetBrush( DC, BgColor );
        DC->DrawLines( aPointCount, aPoints );

        /* Fermeture du polygone */
        if( aPoints[aPointCount - 1] != aPoints[0] )
        {
            GRSLine( ClipBox, DC, aPoints[0].x, aPoints[0].y,
                     aPoints[aPointCount - 1].x, aPoints[aPointCount - 1].y, width, Color );
        }
    }
}


/* not used
 * static void GRSClosedPoly( EDA_Rect* ClipBox, wxDC* DC, int n, wxPoint Points[],
 *                 bool Fill, int Color, int BgColor )
 * {
 * GRSClosedPoly( ClipBox, DC, n, Points, Fill, 0, Color, BgColor );
 * }
 */


/************************************************************************/
/* Routine to draw a new polyline and fill it if Fill, in drawing space. */
/************************************************************************/
void GRPoly( EDA_Rect* ClipBox, wxDC* DC, int n, wxPoint Points[],
             bool Fill, int width, int Color, int BgColor )
{
    for( int i = 0; i<n; ++i )
    {
        Points[i].x = GRMapX( Points[i].x );
        Points[i].y = GRMapY( Points[i].y );
    }

    width = ZoomValue( width );
    GRSPoly( ClipBox, DC, n, Points, Fill, width, Color, BgColor );
}


/**************************************************************************/
/* Routine to draw a closed polyline and fill it if Fill, in object space */
/**************************************************************************/
void GRClosedPoly( EDA_Rect* ClipBox, wxDC* DC, int n, wxPoint Points[],
                   bool Fill, int Color, int BgColor )
{
    GRClosedPoly( ClipBox, DC, n, Points, Fill, 0, Color, BgColor );
}


void GRClosedPoly( EDA_Rect* ClipBox, wxDC* DC, int n, wxPoint Points[],
                   bool Fill, int width, int Color, int BgColor )
{
    for( int i = 0; i<n; ++i )
    {
        Points[i].x = GRMapX( Points[i].x );
        Points[i].y = GRMapY( Points[i].y );
    }

    width = ZoomValue( width );
    GRSClosedPoly( ClipBox, DC, n, Points, Fill, width, Color, BgColor );
}


/***********************************************/
/* Routine to draw a circle, in object space. */
/***********************************************/
void GRCircle( EDA_Rect* ClipBox, wxDC* DC, int x, int y, int r, int Color )
{
    int cx    = GRMapX( x );
    int cy    = GRMapY( y );
    int rayon = ZoomValue( r );

    GRSCircle( ClipBox, DC, cx, cy, rayon, 0, Color );
}


/*****************************************************/
/* Routine to draw a Filled circle, in object space. */
/*****************************************************/
void GRFilledCircle( EDA_Rect* ClipBox, wxDC* DC, int x, int y, int r,
                     int width, int Color, int BgColor )
{
    r     = ZoomValue( r );
    width = ZoomValue( width );
    GRSFilledCircle( ClipBox, DC, GRMapX( x ), GRMapY( y ), r, width, Color, BgColor );
}


/******************************************************/
/* Routine to draw a FILLED circle, in drawing space. */
/******************************************************/
void GRSFilledCircle( EDA_Rect* ClipBox, wxDC* DC, int x, int y, int r,
                      int width, int Color, int BgColor )
{
    /* suppression des cercles hors ecran */
    if( ClipBox )
    {
        int x0, y0, xm, ym;
        x0 = ClipBox->GetX();
        y0 = ClipBox->GetY();
        xm = ClipBox->GetRight();
        ym = ClipBox->GetBottom();
        if( x < (x0 - r) )
            return;
        if( y < (y0 - r) )
            return;
        if( x > (r + xm) )
            return;
        if( y > (r + ym) )
            return;
    }

    GRSetColorPen( DC, Color, width );
    GRSetBrush( DC, BgColor, FILLED );
    DC->DrawEllipse( x - r, y - r, r + r, r + r );
}


/***********************************************************/
/* Routine to draw a circle, in object space. */
/***********************************************************/
void GRCircle( EDA_Rect* ClipBox, wxDC* DC, int x, int y, int r, int width, int Color )
{
    r     = ZoomValue( r );
    width = ZoomValue( width );
    GRSCircle( ClipBox, DC, GRMapX( x ), GRMapY( y ), r, width, Color );
}


/***********************************************/
/* Routine to draw a circle, in drawing space. */
/***********************************************/
void GRSCircle( EDA_Rect* ClipBox, wxDC* DC, int xc, int yc, int r, int width, int Color )
{
    /* suppression des cercles hors ecran */
    if( ClipBox )
    {
        int x0, y0, xm, ym;
        x0 = ClipBox->GetX();
        y0 = ClipBox->GetY();
        xm = ClipBox->GetRight();
        ym = ClipBox->GetBottom();
        if( xc < (x0 - r - width) )
            return;
        if( yc < (y0 - r - width) )
            return;
        if( xc > (r + xm + width) )
            return;
        if( yc > (r + ym + width) )
            return;
    }

    GRSetColorPen( DC, Color, width );
    GRSetBrush( DC, Color, FALSE );
    DC->DrawEllipse( xc - r, yc - r, r + r, r + r );
}


/************************************************/
/* Routine to draw an arc, in USER space.		*/
/* Debut et fin de l'arc donnes par leur coord. */
/************************************************/
void GRArc1( EDA_Rect* ClipBox, wxDC* DC, int x1, int y1, int x2, int y2,
             int xc, int yc, int Color )
{
    GRSArc1( ClipBox, DC,
             GRMapX( x1 ), GRMapY( y1 ), GRMapX( x2 ), GRMapY( y2 ),
             GRMapX( xc ), GRMapY( yc ), 0, Color );
}


/************************************************/
/* Routine to draw an arc, width = width in USER space.		*/
/* Debut et fin de l'arc donnes par leur coord. */
/************************************************/
void GRArc1( EDA_Rect* ClipBox, wxDC* DC, int x1, int y1, int x2, int y2,
             int xc, int yc, int width, int Color )
{
    GRSArc1( ClipBox, DC,
             GRMapX( x1 ), GRMapY( y1 ), GRMapX( x2 ), GRMapY( y2 ),
             GRMapX( xc ), GRMapY( yc ), ZoomValue( width ), Color );
}


/************************************************/
/* Routine to draw an arc, width = width, in screen space.		*/
/* Debut et fin de l'arc donnes par leur coord. */
/************************************************/
void GRSArc1( EDA_Rect* ClipBox, wxDC* DC, int x1, int y1, int x2, int y2,
              int xc, int yc, int width, int Color )
{
    /* suppression des cercles hors ecran */
    if( ClipBox )
    {
        int x0, y0, xm, ym, r;
        x0 = ClipBox->GetX();
        y0 = ClipBox->GetY();
        xm = ClipBox->GetRight();
        ym = ClipBox->GetBottom();
        r  = (int) hypot( x1 - xc, y1 - yc );
        if( xc < (x0 - r) )
            return;
        if( yc < (y0 - r) )
            return;
        if( xc > (r + xm) )
            return;
        if( yc > (r + ym) )
            return;
    }

    GRSetColorPen( DC, Color, width );
    GRSetBrush( DC, Color );
    DC->DrawArc( x1, y1, x2, y2, xc, yc );
}


/********************************************************************/
/* Routine to draw an arc, in screen space.							*/
/* As the Y axe is inverted the Angles should be inverted as well. */
/********************************************************************/
void GRSArc( EDA_Rect* ClipBox, wxDC* DC, int xc, int yc, int StAngle, int EndAngle,
             int r, int width, int Color )
{
    int x1, y1, x2, y2;

    /* suppression des cercles hors ecran */
    if( ClipBox )
    {
        int x0, y0, xm, ym;
        x0 = ClipBox->GetX();
        y0 = ClipBox->GetY();
        xm = ClipBox->GetRight();
        ym = ClipBox->GetBottom();
        if( xc < (x0 - r - width) )
            return;
        if( yc < (y0 - r - width) )
            return;
        if( xc > (r + xm + width) )
            return;
        if( yc > (r + ym + width) )
            return;
    }

    x1 = r; y1 = 0;
    RotatePoint( &x1, &y1, EndAngle );

    x2 = r; y2 = 0;
    RotatePoint( &x2, &y2, StAngle );

    GRSetColorPen( DC, Color, width );
    GRSetBrush( DC, Color );
    DC->DrawArc( xc + x1, yc - y1, xc + x2, yc - y2, xc, yc );
}


/********************************************************************/
/* Routine to draw an Filled arc, in screen space.					*/
/* As the Y axes is inverted the Angles should be inverted as well. */
/********************************************************************/
void GRSFilledArc( EDA_Rect* ClipBox, wxDC* DC, int xc, int yc,
                   int StAngle, int EndAngle, int r, int width, int Color, int BgColor )
{
    int x1, y1, x2, y2;

    /* suppression des cercles hors ecran */
    if( ClipBox )
    {
        int x0, y0, xm, ym;
        x0 = ClipBox->GetX();
        y0 = ClipBox->GetY();
        xm = ClipBox->GetRight();
        ym = ClipBox->GetBottom();
        if( xc < (x0 - r - 1) )
            return;
        if( yc < (y0 - r - 1) )
            return;
        if( xc > (r + xm + 1) )
            return;
        if( yc > (r + ym + 1) )
            return;
    }

    x1 = r; y1 = 0;
    RotatePoint( &x1, &y1, EndAngle );

    x2 = r; y2 = 0;
    RotatePoint( &x2, &y2, StAngle );

    GRSetBrush( DC, BgColor, FILLED );
    GRSetColorPen( DC, Color, width );
    DC->DrawArc( xc + x1, yc - y1, xc + x2, yc - y2, xc, yc );
}


/********************************************************************/
/* Routine to draw a Filled arc, in drawing space.						  */
/* As the Y axes is inverted the Angles should be inverted as well. */
/********************************************************************/
void GRFilledArc( EDA_Rect* ClipBox, wxDC* DC, int x, int y,
                  int StAngle, int EndAngle, int r, int width, int Color, int BgColor )
{
    width = ZoomValue( width );
    GRSFilledArc( ClipBox, DC, GRMapX( x ), GRMapY( y ),
                  StAngle, EndAngle,
                  ZoomValue( r ), width, Color, BgColor );
}


void GRFilledArc( EDA_Rect* ClipBox, wxDC* DC, int x, int y,
                  int StAngle, int EndAngle, int r, int Color, int BgColor )
{
    GRSFilledArc( ClipBox, DC, GRMapX( x ), GRMapY( y ),
                  StAngle, EndAngle,
                  ZoomValue( r ), 0, Color, BgColor );
}


/********************************************************************/
/* Routine to draw an arc, in drawing space.						*/
/* As the Y axes is inverted the Angles should be inverted as well. */
/********************************************************************/
void GRArc( EDA_Rect* ClipBox, wxDC* DC, int xc, int yc, int StAngle,
            int EndAngle, int r, int Color )
{
    int x1, y1, x2, y2;

    /* suppression des cercles hors ecran */
    if( ClipBox )
    {
        int rayon = ZoomValue( r ) + 1;
        int x0, y0, xm, ym, x, y;
        x0 = ClipBox->GetX();
        y0 = ClipBox->GetY();
        xm = ClipBox->GetRight();
        ym = ClipBox->GetBottom();
        x  = GRMapX( xc ); y = GRMapY( yc );
        if( x < (x0 - rayon) )
            return;
        if( y < (y0 - rayon) )
            return;
        if( x > (xm + rayon) )
            return;
        if( y > (ym + rayon) )
            return;
    }

    x1 = r; y1 = 0;
    RotatePoint( &x1, &y1, EndAngle );

    x2 = r; y2 = 0;
    RotatePoint( &x2, &y2, StAngle );

    GRSetColorPen( DC, Color );
    GRSetBrush( DC, Color, FALSE );
    DC->DrawArc( GRMapX( xc + x1 ), GRMapY( yc - y1 ),
                GRMapX( xc + x2 ), GRMapY( yc - y2 ),
                GRMapX( xc ), GRMapY( yc ) );
}


/********************************************************************/
/* Routine to draw an arc, width = width, in drawing space.						*/
/* As the Y axes is inverted the Angles should be inverted as well. */
/********************************************************************/
void GRArc( EDA_Rect* ClipBox, wxDC* DC, int x, int y, int StAngle, int EndAngle,
            int r, int width, int Color )
{
    GRSArc( ClipBox, DC, GRMapX( x ), GRMapY( y ),
            StAngle, EndAngle,
            ZoomValue( r ),
            ZoomValue( width ),
            Color );
}


/**************************************************/
/* Routine to draw a Rectangle, in drawing space. */
/**************************************************/
void GRRect( EDA_Rect* ClipBox, wxDC* DC, int x1, int y1, int x2, int y2, int Color )
{
    x1 = GRMapX( x1 ); y1 = GRMapY( y1 );
    x2 = GRMapX( x2 ); y2 = GRMapY( y2 );

    GRSRect( ClipBox, DC, x1, y1, x2, y2, Color );
}


/**************************************************/
/* Routine to draw a Rectangle, in drawing space. */
/**************************************************/
void GRRect( EDA_Rect* ClipBox, wxDC* DC, int x1, int y1, int x2, int y2, int width, int Color )
{
    x1    = GRMapX( x1 ); y1 = GRMapY( y1 );
    x2    = GRMapX( x2 ); y2 = GRMapY( y2 );
    width = ZoomValue( width );

    GRSRect( ClipBox, DC, x1, y1, x2, y2, width, Color );
}


/************************************************************************************/
void GRFilledRect( EDA_Rect* ClipBox, wxDC* DC, int x1, int y1, int x2, int y2,
                   int Color, int BgColor )
/************************************************************************************/
/* Routine to draw a Rectangle (filled with AreaColor), in drawing space. */
{
    x1 = GRMapX( x1 ); y1 = GRMapY( y1 );
    x2 = GRMapX( x2 ); y2 = GRMapY( y2 );

    GRSFilledRect( ClipBox, DC, x1, y1, x2, y2, 0, Color, BgColor );
}


/************************************************************************************/
void GRFilledRect( EDA_Rect* ClipBox, wxDC* DC, int x1, int y1, int x2, int y2,
                   int width, int Color, int BgColor )
/************************************************************************************/
/* Routine to draw a Rectangle (filled with AreaColor), in drawing space. */
{
    x1    = GRMapX( x1 ); y1 = GRMapY( y1 );
    x2    = GRMapX( x2 ); y2 = GRMapY( y2 );
    width = ZoomValue( width );

    GRSFilledRect( ClipBox, DC, x1, y1, x2, y2, width, Color, BgColor );
}


/*************************************************/
/* Routine to draw a Rectangle, in screen space. */
/*************************************************/
void GRSRect( EDA_Rect* ClipBox, wxDC* DC, int x1, int y1, int x2, int y2, int Color )
{
    GRSRect( ClipBox, DC, x1, y1, x2, y2, 0, Color );
}


void GRSRect( EDA_Rect* ClipBox, wxDC* DC, int x1, int y1, int x2, int y2,
              int width, int Color )
{
    if( x1 > x2 )
        EXCHG( x1, x2 );
    if( y1 > y2 )
        EXCHG( y1, y2 );

    /* Clipping des coordonnees */
    if( ClipBox )
    {
        int xmin = ClipBox->GetX();
        int ymin = ClipBox->GetY();
        int xmax = ClipBox->GetRight();
        int ymax = ClipBox->GetBottom();

        if( x1 > xmax )
            return;
        if( x2 < xmin )
            return;
        if( y1 > ymax )
            return;
        if( y2 < ymin )
            return;
    }

    GRSetColorPen( DC, Color, width );
    if( (x1 == x2) || (y1 == y2) )
        DC->DrawLine( x1, y1, x2, y2 );
    else
    {
        GRSetBrush( DC, BLACK );
        DC->DrawRectangle( x1, y1, x2 - x1, y2 - y1 );
    }
}


/* Routine to draw a Filled Rectangle, in screen space. */
/***************************************************************************************/
void GRSFilledRect( EDA_Rect* ClipBox, wxDC* DC, int x1, int y1, int x2, int y2,
                    int Color, int BgColor )
/***************************************************************************************/
{
    GRSFilledRect( ClipBox, DC, x1, y1, x2, y2, 0, Color, BgColor );
}


/***************************************************************************************/
void GRSFilledRect( EDA_Rect* ClipBox, wxDC* DC, int x1, int y1, int x2, int y2,
                    int width, int Color, int BgColor )
/***************************************************************************************/
{
    if( x1 > x2 )
        EXCHG( x1, x2 );
    if( y1 > y2 )
        EXCHG( y1, y2 );
    if( ClipBox )
    {
        int xmin = ClipBox->GetX();
        int ymin = ClipBox->GetY();
        int xmax = ClipBox->GetRight();
        int ymax = ClipBox->GetBottom();

        if( x1 > xmax )
            return;
        if( x2 < xmin )
            return;
        if( y1 > ymax )
            return;
        if( y2 < ymin )
            return;

        // Clipping coordinates
        if( x1 < xmin )
            x1 = xmin - 1;
        if( y1 < ymin )
            y1 = ymin - 1;
        if( x2 > xmax )
            x2 = xmax + 1;
        if( y2 > ymax )
            y2 = ymax + 1;
    }

    GRSetColorPen( DC, Color, width );
    if( (x1 == x2) || (y1 == y2) )
        DC->DrawLine( x1, y1, x2, y2 );
    else
    {
        GRSetBrush( DC, BgColor, FILLED );
        DC->DrawRectangle( x1, y1, x2 - x1, y2 - y1 );
    }
}


#ifdef USE_CLIP_FILLED_POLYGONS

/** Function ClipAndDrawFilledPoly
 *  Used to clip a polygon and draw it as Filled Polygon
 *  uses the Sutherland and Hodgman algo to clip the given poly against a rectangle.
 *  This rectangle is the drawing area
 *  this is useful under Linux (2009) because filled polygons are incorrectly drawn
 *  if they have too large coordinates (seems due to integer overflows in calculations)
 *  Could be removed in some years, if become unnecesary.
 */
#include "SutherlandHodgmanClipPoly.h"
void ClipAndDrawFilledPoly( EDA_Rect* aClipBox, wxDC* aDC, wxPoint aPoints[], int n )
{
    static vector<wxPoint> clippedPolygon;
    static pointVector     inputPolygon, outputPolygon;

    inputPolygon.clear();
    outputPolygon.clear();
    clippedPolygon.clear();
    for( int ii = 0; ii < n; ii++ )
        inputPolygon.push_back( PointF( (REAL)aPoints[ii].x, (REAL)aPoints[ii].y ) );

    RectF             window( (REAL) aClipBox->GetX(), (REAL) aClipBox->GetY(),
                             (REAL) aClipBox->GetWidth(), (REAL) aClipBox->GetHeight() );

    SutherlandHodgman sh( window );
    sh.Clip( inputPolygon, outputPolygon );

    for( cpointIterator cit = outputPolygon.begin(); cit != outputPolygon.end(); ++cit )
    {
        clippedPolygon.push_back( wxPoint( wxRound( cit->X ), wxRound( cit->Y ) ) );
    }

    if ( clippedPolygon.size() )
        aDC->DrawPolygon( clippedPolygon.size(), &clippedPolygon[0] );
}
#endif