Merge pull request #3 from saurabhb17/master

secondary files

1 files changed, 1268 insertions, 0 deletions

diff --git a/common/gr_basic.cpp b/common/gr_basic.cpp
new file mode 100644
index 0000000..1e913cb
--- /dev/null
+++ b/common/gr_basic.cpp
@@ -0,0 +1,1268 @@
+/********************************/
+/* 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>
+#include <bezier_curves.h>
+#include <math_for_graphics.h>
+#include <wx/graphics.h>
+#if defined(__WXMAC__) && defined(USE_WX_GRAPHICS_CONTEXT)
+#include <wx/dcgraph.h>
+#endif
+
+static const bool FILLED = true;
+static const bool NOT_FILLED = false;
+
+/* Important Note:
+ * These drawing functions  clip draw item before send these items to wxDC draw
+ * functions.  For guy who asks why i did it, see a sample of problems encountered
+ * 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 clipping 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
+ */
+
+
+/* Definitions for enabling and disabling debugging features in gr_basic.cpp.
+ * Please remember to set these back to 0 before making LAUNCHPAD commits.
+ */
+#define DEBUG_DUMP_CLIP_ERROR_COORDS 0  // Set to 1 to dump clip algorithm errors.
+#define DEBUG_DUMP_CLIP_COORDS       0  // Set to 1 to dump clipped coordinates.
+
+
+// For draw mode = XOR GR_XOR or GR_NXOR by background color
+GR_DRAWMODE g_XorMode = GR_NXOR;
+
+
+static void ClipAndDrawPoly( EDA_RECT * ClipBox, wxDC * DC, wxPoint Points[],
+                             int n );
+
+/* These functions are used by corresponding functions
+ * ( GRSCircle is called by GRCircle for instance) after mapping coordinates
+ * from user units to screen units(pixels coordinates)
+ */
+static void GRSRect( EDA_RECT* aClipBox, wxDC* aDC, int x1, int y1,
+                     int x2, int y2, int aWidth, EDA_COLOR_T aColor,
+                     wxPenStyle aStyle = wxPENSTYLE_SOLID );
+
+/**/
+
+static int          GRLastMoveToX, GRLastMoveToY;
+static bool         s_ForceBlackPen;   /* if true: draws in black instead of
+                                        * color for printing. */
+static int          xcliplo = 0,
+                    ycliplo = 0,
+                    xcliphi = 2000,
+                    ycliphi = 2000;
+
+static EDA_COLOR_T   s_DC_lastcolor = UNSPECIFIED_COLOR;
+static EDA_COLOR_T   s_DC_lastbrushcolor = UNSPECIFIED_COLOR;
+static bool  s_DC_lastbrushfill  = false;
+static wxDC* s_DC_lastDC = NULL;
+
+/***
+ * Utility for the line clipping code, returns the boundary code of
+ * a point. Bit allocation is arbitrary
+ */
+static inline int clipOutCode( const EDA_RECT *aClipBox, int x, int y )
+{
+    int code;
+    if( y < aClipBox->GetY() )
+        code = 2;
+    else if( y > aClipBox->GetBottom() )
+        code = 1;
+    else
+        code = 0;
+    if( x < aClipBox->GetX() )
+        code |= 4;
+    else if( x > aClipBox->GetRight() )
+        code |= 8;
+    return code;
+}
+
+
+/**
+ * Test if any part of a line falls within the bounds of a rectangle.
+ *
+ * Please note that this is only accurate for lines that are one pixel wide.
+ *
+ * @param aClipBox - The rectangle to test.
+ * @param x1 - X coordinate of one end of a line.
+ * @param y1 - Y coordinate of one end of a line.
+ * @param x2 - X coordinate of the other end of a line.
+ * @param y2 - Y coordinate of the other  end of a line.
+ *
+ * @return - False if any part of the line lies within the rectangle.
+ */
+static bool clipLine( const EDA_RECT *aClipBox, int &x1, int &y1, int &x2, int &y2 )
+{
+    // Stock Cohen-Sutherland algorithm; check *any* CG book for details
+    int outcode1 = clipOutCode( aClipBox, x1, y1 );
+    int outcode2 = clipOutCode( aClipBox, x2, y2 );
+
+    while( outcode1 || outcode2 )
+    {
+        // Fast reject
+        if( outcode1 & outcode2 )
+            return true;
+
+        // Choose a side to clip
+        int thisoutcode, x, y;
+        if( outcode1 )
+            thisoutcode = outcode1;
+        else
+            thisoutcode = outcode2;
+
+        /* One clip round
+         * Since we use the full range of 32 bit ints, the proportion
+         * computation has to be done in 64 bits to avoid horrible
+         * results */
+        if( thisoutcode & 1 ) // Clip the bottom
+        {
+            y = aClipBox->GetBottom();
+            x = x1 + (x2 - x1) * int64_t(y - y1) / (y2 - y1);
+        }
+        else if( thisoutcode & 2 ) // Clip the top
+        {
+            y = aClipBox->GetY();
+            x = x1 + (x2 - x1) * int64_t(y - y1) / (y2 - y1);
+        }
+        else if( thisoutcode & 8 ) // Clip the right
+        {
+            x = aClipBox->GetRight();
+            y = y1 + (y2 - y1) * int64_t(x - x1) / (x2 - x1);
+        }
+        else // if( thisoutcode & 4), obviously, clip the left
+        {
+            x = aClipBox->GetX();
+            y = y1 + (y2 - y1) * int64_t(x - x1) / (x2 - x1);
+        }
+
+        // Put the result back and update the boundary code
+        // No ambiguity, otherwise it would have been a fast reject
+        if( thisoutcode == outcode1 )
+        {
+            x1 = x;
+            y1 = y;
+            outcode1 = clipOutCode( aClipBox, x1, y1 );
+        }
+        else
+        {
+            x2 = x;
+            y2 = y;
+            outcode2 = clipOutCode( aClipBox, x2, y2 );
+        }
+    }
+    return false;
+}
+
+static void WinClipAndDrawLine( EDA_RECT* ClipBox, wxDC* DC, int x1, int y1, int x2, int y2, int width )
+{
+    GRLastMoveToX = x2;
+    GRLastMoveToY = y2;
+
+    if( ClipBox )
+    {
+        EDA_RECT clipbox(*ClipBox);
+        clipbox.Inflate(width/2);
+        if( clipLine( &clipbox, x1, y1, x2, y2 ) )
+            return;
+    }
+
+    DC->DrawLine( x1, y1, x2, y2 );
+}
+
+
+/* Forcing a reset of the current pen.
+ * Must be called after changing the graphical device before any trace.
+ */
+void GRResetPenAndBrush( wxDC* DC )
+{
+    GRSetBrush( DC, BLACK );  // Force no fill
+    s_DC_lastbrushcolor = UNSPECIFIED_COLOR;
+    s_DC_lastcolor =  UNSPECIFIED_COLOR;
+    s_DC_lastDC    = NULL;
+}
+
+
+/**
+ * Function GRSetColorPen
+ * sets a pen style, width, color, and alpha into the given device context.
+ */
+void GRSetColorPen( wxDC* DC, EDA_COLOR_T Color, int width, wxPenStyle style )
+{
+    // Under OSX and while printing when wxPen is set to 0, renderer follows the request drawing
+    // nothing & in the bitmap world the minimum is enough to light a pixel, in vectorial one not
+    if( width <= 1 )
+        width = DC->DeviceToLogicalXRel( 1 );
+
+    if( s_ForceBlackPen )
+        Color = BLACK;
+
+    wxColour wx_color = MakeColour( Color );
+    const wxPen& curr_pen = DC->GetPen();
+
+    if( !curr_pen.IsOk() || curr_pen.GetColour() != wx_color
+       || curr_pen.GetWidth() != width
+       || curr_pen.GetStyle() != style )
+    {
+        wxPen pen;
+        pen.SetColour( wx_color );
+        pen.SetWidth( width );
+        pen.SetStyle( style );
+        DC->SetPen( pen );
+    }
+    else
+        // Should be not needed, but on Linux, in printing process
+        // the curr pen settings needs to be sometimes re-initialized
+        // Clearly, this is due to a bug, related to SetBrush(),
+        // but we have to live with it, at least on wxWidgets 3.0
+        DC->SetPen( curr_pen );
+}
+
+
+void GRSetBrush( wxDC* DC, EDA_COLOR_T Color, bool fill )
+{
+    if( s_ForceBlackPen )
+        Color = BLACK;
+
+    if(   s_DC_lastbrushcolor != Color
+       || s_DC_lastbrushfill  != fill
+       || s_DC_lastDC != DC )
+    {
+        wxBrush brush;
+
+        brush.SetColour( MakeColour( Color ) );
+
+        if( fill )
+            brush.SetStyle( wxBRUSHSTYLE_SOLID );
+        else
+            brush.SetStyle( wxBRUSHSTYLE_TRANSPARENT );
+
+        DC->SetBrush( brush );
+
+        s_DC_lastbrushcolor = Color;
+        s_DC_lastbrushfill  = fill;
+        s_DC_lastDC = DC;
+    }
+}
+
+
+/**
+ * Function GRForceBlackPen
+ * @param flagforce True to force a black pen whenever the asked color
+ */
+void GRForceBlackPen( bool flagforce )
+{
+    s_ForceBlackPen = flagforce;
+}
+
+
+/**
+ * Function GetGRForceBlackPenState
+ * @return s_ForceBlackPen (True if  a black pen was forced)
+ */
+bool GetGRForceBlackPenState( void )
+{
+    return s_ForceBlackPen;
+}
+
+
+/*************************************/
+/* Set the device context draw mode. */
+/*************************************/
+void GRSetDrawMode( wxDC* DC, GR_DRAWMODE draw_mode )
+{
+    if( draw_mode & GR_OR )
+#if defined(__WXMAC__) && (wxMAC_USE_CORE_GRAPHICS || wxCHECK_VERSION( 2, 9, 0 ) )
+
+        DC->SetLogicalFunction( wxCOPY );
+#elif defined( USE_WX_GRAPHICS_CONTEXT )
+
+        DC->SetLogicalFunction( wxCOPY );
+#else
+
+        DC->SetLogicalFunction( wxOR );
+#endif
+    else if( draw_mode & GR_XOR )
+#if defined( USE_WX_GRAPHICS_CONTEXT )
+
+        DC->SetLogicalFunction( wxCOPY );
+#else
+
+        DC->SetLogicalFunction( wxXOR );
+#endif
+    else if( draw_mode & GR_NXOR )
+#if defined(__WXMAC__) && (wxMAC_USE_CORE_GRAPHICS || wxCHECK_VERSION( 2, 9, 0 ) )
+
+        DC->SetLogicalFunction( wxXOR );
+#elif defined( USE_WX_GRAPHICS_CONTEXT )
+
+        DC->SetLogicalFunction( wxCOPY );
+#else
+
+        DC->SetLogicalFunction( wxEQUIV );
+#endif
+    else if( draw_mode & GR_INVERT )
+#if defined( USE_WX_GRAPHICS_CONTEXT )
+
+        DC->SetLogicalFunction( wxCOPY );
+#else
+
+        DC->SetLogicalFunction( wxINVERT );
+#endif
+    else if( draw_mode & GR_COPY )
+        DC->SetLogicalFunction( wxCOPY );
+
+#ifdef USE_WX_OVERLAY
+    DC->SetLogicalFunction( wxCOPY );
+#endif
+}
+
+
+void GRPutPixel( EDA_RECT* ClipBox, wxDC* DC, int x, int y, EDA_COLOR_T Color )
+{
+    if( ClipBox && !ClipBox->Contains( x, y ) )
+        return;
+
+    GRSetColorPen( DC, Color );
+    DC->DrawPoint( x, y );
+}
+
+
+/*
+ * Draw a line, in object space.
+ */
+void GRLine( EDA_RECT* ClipBox,
+             wxDC*     DC,
+             int       x1,
+             int       y1,
+             int       x2,
+             int       y2,
+             int       width,
+             EDA_COLOR_T       Color )
+{
+    GRSetColorPen( DC, Color, width );
+    WinClipAndDrawLine( ClipBox, DC, x1, y1, x2, y2, width );
+    GRLastMoveToX = x2;
+    GRLastMoveToY = y2;
+}
+
+
+void GRLine( EDA_RECT* aClipBox, wxDC* aDC, wxPoint aStart, wxPoint aEnd, int aWidth, EDA_COLOR_T aColor )
+{
+    GRLine( aClipBox, aDC, aStart.x, aStart.y, aEnd.x, aEnd.y, aWidth, aColor );
+}
+
+
+void GRDashedLine( EDA_RECT* ClipBox, wxDC*     DC,
+                   int x1, int y1, int x2, int  y2,
+                   int       width, EDA_COLOR_T Color )
+{
+    GRLastMoveToX  = x2;
+    GRLastMoveToY  = y2;
+    s_DC_lastcolor = UNSPECIFIED_COLOR;
+    GRSetColorPen( DC, Color, width, wxPENSTYLE_SHORT_DASH );
+    WinClipAndDrawLine( ClipBox, DC, x1, y1, x2, y2, width );
+    s_DC_lastcolor = UNSPECIFIED_COLOR;
+    GRSetColorPen( DC, Color, width );
+}
+
+
+/*
+ * Move to a new position, in object space.
+ */
+void GRMoveTo( int x, int y )
+{
+    GRLastMoveToX = x;
+    GRLastMoveToY = y;
+}
+
+
+/*
+ * Draw line to a new position, in object space.
+ */
+void GRLineTo( EDA_RECT* ClipBox, wxDC* DC, int x, int y, int width, EDA_COLOR_T Color )
+{
+    GRLine( ClipBox, DC, GRLastMoveToX, GRLastMoveToY, x, y, width, Color );
+}
+
+
+void GRMixedLine( EDA_RECT* ClipBox, wxDC* DC, int x1, int y1, int x2, int y2,
+                  int width, EDA_COLOR_T Color )
+{
+    GRSetColorPen( DC, Color, width, wxPENSTYLE_DOT_DASH );
+    GRLine( ClipBox, DC, x1, y1, x2, y2, width, Color );
+    GRSetColorPen( DC, Color, width );
+}
+
+
+
+/**
+ * Function GRLineArray
+ * draws an array of lines (not a polygon).
+ * @param aClipBox = the clip box
+ * @param aDC = the device context into which drawing should occur.
+ * @param aLines = a list of pair of coordinate in user space: a pair for each line.
+ * @param aWidth = the width of each line.
+ * @param aColor = an index into our color table of RGB colors.
+ * @see EDA_COLOR_T and colors.h
+ */
+void GRLineArray( EDA_RECT* aClipBox, wxDC* aDC, std::vector<wxPoint>& aLines,
+                  int aWidth, EDA_COLOR_T aColor )
+{
+    GRSetColorPen( aDC, aColor, aWidth );
+
+    if( aClipBox )
+        aClipBox->Inflate(aWidth/2);
+
+#if defined( __WXMAC__ ) && defined( USE_WX_GRAPHICS_CONTEXT )
+    wxGCDC *gcdc = wxDynamicCast( aDC, wxGCDC );
+    if( gcdc )
+    {
+        wxGraphicsContext *gc = gcdc->GetGraphicsContext();
+
+        // create path
+        wxGraphicsPath path = gc->CreatePath();
+        for( unsigned i = 0; i < aLines.size(); i += 2 )
+        {
+            int x1 = aLines[i].x;
+            int y1 = aLines[i].y;
+            int x2 = aLines[i+1].x;
+            int y2 = aLines[i+1].y;
+            if( ( aClipBox == NULL ) || !clipLine( aClipBox, x1, y1, x2, y2 ) )
+            {
+                path.MoveToPoint( x1, y1 );
+                path.AddLineToPoint( x2, y2 );
+            }
+        }
+        // draw path
+        gc->StrokePath( path );
+    }
+    else
+#endif
+    {
+        for( unsigned i = 0; i < aLines.size(); i += 2 )
+        {
+            int x1 = aLines[i].x;
+            int y1 = aLines[i].y;
+            int x2 = aLines[i+1].x;
+            int y2 = aLines[i+1].y;
+            if( ( aClipBox == NULL ) || !clipLine( aClipBox, x1, y1, x2, y2 ) )
+                aDC->DrawLine( x1, y1, x2, y2 );
+        }
+    }
+    GRMoveTo( aLines[aLines.size() - 1].x, aLines[aLines.size() - 1].y );
+
+    if( aClipBox )
+        aClipBox->Inflate(-aWidth/2);
+}
+
+// Draw  the outline of a thick segment wih rounded ends
+void GRCSegm( EDA_RECT* ClipBox, wxDC* DC, int x1, int y1, int x2, int y2,
+              int width, int aPenSize, EDA_COLOR_T Color )
+{
+    GRLastMoveToX = x2;
+    GRLastMoveToY = y2;
+
+    if( ClipBox )
+    {
+        EDA_RECT clipbox(*ClipBox);
+        clipbox.Inflate(width/2);
+
+        if( clipLine( &clipbox, x1, y1, x2, y2 ) )
+            return;
+    }
+
+
+    if( width <= 2 )   /*  single line or 2 pixels */
+    {
+        GRSetColorPen( DC, Color, width );
+        DC->DrawLine( x1, y1, x2, y2 );
+        return;
+    }
+
+    GRSetBrush( DC, Color, NOT_FILLED );
+    GRSetColorPen( DC, Color, aPenSize );
+
+    int radius = (width + 1) >> 1;
+    int dx = x2 - x1;
+    int dy = y2 - y1;
+    double angle = -ArcTangente( dy, dx );
+    wxPoint start;
+    wxPoint end;
+    wxPoint org( x1, y1);
+    int len = (int) hypot( dx, dy );
+
+    // We know if the DC is mirrored, to draw arcs
+    int slx = DC->DeviceToLogicalX( 1 ) - DC->DeviceToLogicalX( 0 );
+    int sly = DC->DeviceToLogicalY( 1 ) - DC->DeviceToLogicalY( 0 );
+    bool mirrored = (slx > 0 && sly < 0) || (slx < 0 && sly > 0);
+
+    // first edge
+    start.x = 0;
+    start.y = radius;
+    end.x = len;
+    end.y = radius;
+    RotatePoint( &start, angle);
+    RotatePoint( &end, angle);
+
+    start += org;
+    end += org;
+
+    DC->DrawLine( start, end );
+
+    // first rounded end
+    end.x = 0;
+    end.y = -radius;
+    RotatePoint( &end, angle);
+    end += org;
+
+    if( !mirrored )
+        DC->DrawArc( end, start, org );
+    else
+        DC->DrawArc( start, end, org );
+
+
+    // second edge
+    start.x = len;
+    start.y = -radius;
+    RotatePoint( &start, angle);
+    start += org;
+
+    DC->DrawLine( start, end );
+
+    // second rounded end
+    end.x = len;
+    end.y = radius;
+    RotatePoint( &end, angle);
+    end += org;
+
+    if( !mirrored )
+        DC->DrawArc( end.x, end.y, start.x, start.y, x2, y2 );
+    else
+        DC->DrawArc( start.x, start.y, end.x, end.y, x2, y2 );
+}
+
+
+void GRCSegm( EDA_RECT* ClipBox, wxDC* DC, int x1, int y1, int x2, int y2,
+              int width, EDA_COLOR_T Color )
+{
+    GRCSegm( ClipBox, DC, x1, y1, x2, y2, width, 0, Color );
+}
+
+
+void GRCSegm( EDA_RECT* aClipBox, wxDC* aDC, wxPoint aStart, wxPoint aEnd,
+              int aWidth, EDA_COLOR_T aColor )
+{
+    GRCSegm( aClipBox, aDC, aStart.x, aStart.y, aEnd.x, aEnd.y, aWidth, 0, aColor );
+}
+
+
+/*
+ * Draw segment (full) with rounded ends in object space (real coords.).
+ */
+void GRFillCSegm( EDA_RECT* ClipBox, wxDC* DC, int x1, int y1, int x2, int y2,
+                  int width, EDA_COLOR_T Color )
+{
+    GRSetColorPen( DC, Color, width );
+    WinClipAndDrawLine( ClipBox, DC, x1, y1, x2, y2, width );
+}
+
+
+void GRFilledSegment( EDA_RECT* aClipBox, wxDC* aDC, wxPoint aStart, wxPoint aEnd,
+                      int aWidth, EDA_COLOR_T aColor )
+{
+    GRSetColorPen( aDC, aColor, aWidth );
+    WinClipAndDrawLine( aClipBox, aDC, aStart.x, aStart.y, aEnd.x, aEnd.y, aWidth );
+}
+
+
+static bool IsGRSPolyDrawable( EDA_RECT* ClipBox, int n, wxPoint Points[] )
+{
+    if( !ClipBox )
+        return true;
+
+    if( n <= 0 )
+        return false;
+
+    int Xmin, Xmax, Ymin, Ymax;
+
+    Xmin = Xmax = Points[0].x;
+    Ymin = Ymax = Points[0].y;
+
+    for( int ii = 1; ii < n; ii++ )     // calculate rectangle
+    {
+        Xmin = std::min( Xmin, Points[ii].x );
+        Xmax = std::max( Xmax, Points[ii].x );
+        Ymin = std::min( Ymin, Points[ii].y );
+        Ymax = std::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;
+}
+
+
+/*
+ * 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,
+                     EDA_COLOR_T Color, EDA_COLOR_T BgColor )
+{
+    if( !IsGRSPolyDrawable( ClipBox, n, Points ) )
+        return;
+
+    if( Fill && ( n > 2 ) )
+    {
+        GRSetBrush( DC, BgColor, FILLED );
+        GRSetColorPen( DC, Color, width );
+
+        /* clip before send the filled polygon to wxDC, because under linux
+         * (GTK?) polygons having large coordinates are incorrectly drawn
+         * (integer overflow in coordinates, I am guessing)
+         */
+        ClipAndDrawPoly( ClipBox, DC, Points, n );
+    }
+    else
+    {
+#if defined( __WXMAC__ ) && defined( USE_WX_GRAPHICS_CONTEXT )
+        wxGCDC *gcdc = wxDynamicCast( DC, wxGCDC );
+        if( gcdc )
+        {
+            wxGraphicsContext *gc = gcdc->GetGraphicsContext();
+
+            // set pen
+            GRSetColorPen( DC, Color, width );
+
+            // create path
+            wxGraphicsPath path = gc->CreatePath();
+            path.MoveToPoint( Points[0].x, Points[0].y );
+            for( int i = 1; i < n; ++i )
+            {
+                path.AddLineToPoint( Points[i].x, Points[i].y );
+            }
+            // draw path
+            gc->StrokePath( path );
+
+            // correctly update last position
+            GRMoveTo( Points[n - 1].x, Points[n - 1].y );
+        }
+        else
+#endif
+        {
+            GRMoveTo( Points[0].x, Points[0].y );
+            for( int i = 1; i < n; ++i )
+            {
+                GRLineTo( ClipBox, DC, Points[i].x, Points[i].y, width, Color );
+            }
+        }
+    }
+}
+
+
+/*
+ * Draw a new closed polyline and fill it if Fill, in screen space.
+ */
+static void GRSClosedPoly( EDA_RECT* aClipBox, wxDC* aDC,
+                           int       aPointCount, wxPoint aPoints[],
+                           bool      aFill, int aWidth,
+                           EDA_COLOR_T       aColor,
+                           EDA_COLOR_T       aBgColor )
+{
+    if( !IsGRSPolyDrawable( aClipBox, aPointCount, aPoints ) )
+        return;
+
+    if( aFill && ( aPointCount > 2 ) )
+    {
+        GRLastMoveToX = aPoints[aPointCount - 1].x;
+        GRLastMoveToY = aPoints[aPointCount - 1].y;
+        GRSetBrush( aDC, aBgColor, FILLED );
+        GRSetColorPen( aDC, aColor, aWidth );
+        ClipAndDrawPoly( aClipBox, aDC, aPoints, aPointCount );
+    }
+    else
+    {
+#if defined( __WXMAC__ ) && defined( USE_WX_GRAPHICS_CONTEXT )
+        wxGCDC *gcdc = wxDynamicCast( aDC, wxGCDC );
+        if( gcdc )
+        {
+            wxGraphicsContext *gc = gcdc->GetGraphicsContext();
+
+            // set pen
+            GRSetColorPen( aDC, aColor, aWidth );
+
+            // create path
+            wxGraphicsPath path = gc->CreatePath();
+            path.MoveToPoint( aPoints[0].x, aPoints[0].y );
+            for( int i = 1; i < aPointCount; ++i )
+            {
+                path.AddLineToPoint( aPoints[i].x, aPoints[i].y );
+            }
+            if( aPoints[aPointCount - 1] != aPoints[0] )
+                path.AddLineToPoint( aPoints[0].x, aPoints[0].y );
+            // draw path
+            gc->StrokePath( path );
+
+            // correctly update last position
+            GRMoveTo( aPoints[aPointCount - 1].x, aPoints[aPointCount - 1].y );
+        }
+        else
+#endif
+        {
+            GRMoveTo( aPoints[0].x, aPoints[0].y );
+            for( int i = 1; i < aPointCount; ++i )
+            {
+                GRLineTo( aClipBox, aDC, aPoints[i].x, aPoints[i].y, aWidth, aColor );
+            }
+
+            int lastpt = aPointCount - 1;
+
+            // Close the polygon
+            if( aPoints[lastpt] != aPoints[0] )
+            {
+                GRLineTo( aClipBox, aDC, aPoints[0].x, aPoints[0].y, aWidth, aColor );
+            }
+        }
+    }
+}
+
+
+/*
+ * 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, EDA_COLOR_T Color, EDA_COLOR_T BgColor )
+{
+    GRSPoly( ClipBox, DC, n, Points, Fill, width, Color, BgColor );
+}
+
+
+/*
+ * 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, EDA_COLOR_T Color, EDA_COLOR_T 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, EDA_COLOR_T Color, EDA_COLOR_T BgColor )
+{
+    GRSClosedPoly( ClipBox, DC, n, Points, Fill, width, Color, BgColor );
+}
+
+
+void GRCircle( EDA_RECT* ClipBox, wxDC* DC, int xc, int yc, int r, int width, EDA_COLOR_T Color )
+{
+    /* Clip circles off screen. */
+    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;
+    }
+
+    GRSetBrush( DC, Color, NOT_FILLED );
+    GRSetColorPen( DC, Color, width );
+    DC->DrawEllipse( xc - r, yc - r, r + r, r + r );
+}
+
+
+void GRCircle( EDA_RECT* ClipBox, wxDC* DC, int x, int y, int r, EDA_COLOR_T Color )
+{
+    GRCircle( ClipBox, DC, x, y, r, 0, Color );
+}
+
+
+void GRCircle( EDA_RECT* aClipBox, wxDC* aDC, wxPoint aPos, int aRadius, int aWidth, EDA_COLOR_T aColor )
+{
+    GRCircle( aClipBox, aDC, aPos.x, aPos.y, aRadius, aWidth, aColor );
+}
+
+
+void GRFilledCircle( EDA_RECT* ClipBox, wxDC* DC, int x, int y, int r,
+                     int width, EDA_COLOR_T Color, EDA_COLOR_T BgColor )
+{
+    /* Clip circles off screen. */
+    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;
+    }
+
+    GRSetBrush( DC, BgColor, FILLED );
+    GRSetColorPen( DC, Color, width );
+    DC->DrawEllipse( x - r, y - r, r + r, r + r );
+}
+
+
+void GRFilledCircle( EDA_RECT* aClipBox, wxDC* aDC, wxPoint aPos, int aRadius, EDA_COLOR_T aColor )
+{
+    GRFilledCircle( aClipBox, aDC, aPos.x, aPos.y, aRadius, 0, aColor, aColor );
+}
+
+
+/*
+ * Draw an arc in user space.
+ */
+void GRArc1( EDA_RECT* ClipBox, wxDC* DC, int x1, int y1, int x2, int y2,
+             int xc, int yc, EDA_COLOR_T Color )
+{
+    GRArc1( ClipBox, DC, x1, y1, x2, y2, xc, yc, 0, Color );
+}
+
+
+/*
+ * Draw an arc, width = width in user space.
+ */
+void GRArc1( EDA_RECT* ClipBox, wxDC* DC, int x1, int y1, int x2, int y2,
+             int xc, int yc, int width, EDA_COLOR_T Color )
+{
+    /* Clip arcs off screen. */
+    if( ClipBox )
+    {
+        int x0, y0, xm, ym, r;
+        x0 = ClipBox->GetX();
+        y0 = ClipBox->GetY();
+        xm = ClipBox->GetRight();
+        ym = ClipBox->GetBottom();
+        r  = KiROUND( Distance( x1, y1, xc, yc ) );
+        if( xc < ( x0 - r ) )
+            return;
+        if( yc < ( y0 - r ) )
+            return;
+        if( xc > ( r + xm ) )
+            return;
+        if( yc > ( r + ym ) )
+            return;
+    }
+
+    GRSetBrush( DC, Color );
+    GRSetColorPen( DC, Color, width );
+    DC->DrawArc( x1, y1, x2, y2, xc, yc );
+}
+
+
+void GRArc1( EDA_RECT* aClipBox, wxDC* aDC, wxPoint aStart, wxPoint aEnd,
+             wxPoint aCenter, int aWidth, EDA_COLOR_T aColor )
+{
+    GRArc1( aClipBox, aDC, aStart.x, aStart.y, aEnd.x, aEnd.y, aCenter.x, aCenter.y,
+            aWidth, aColor );
+}
+
+
+/*
+ * Draw a filled arc in drawing space.
+ */
+void GRFilledArc( EDA_RECT* ClipBox,
+                  wxDC*     DC,
+                  int       x,
+                  int       y,
+                  double    StAngle,
+                  double    EndAngle,
+                  int       r,
+                  int       width,
+                  EDA_COLOR_T       Color,
+                  EDA_COLOR_T       BgColor )
+{
+    int x1, y1, x2, y2;
+
+    /* Clip arcs off screen */
+    if( ClipBox )
+    {
+        int x0, y0, xm, ym;
+        x0 = ClipBox->GetX();
+        y0 = ClipBox->GetY();
+        xm = ClipBox->GetRight();
+        ym = ClipBox->GetBottom();
+
+        if( x < ( x0 - r - 1 ) )
+            return;
+
+        if( y < ( y0 - r - 1 ) )
+            return;
+
+        if( x > ( r + xm + 1 ) )
+            return;
+
+        if( y > ( 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( x + x1, y - y1, x + x2, y - y2, x, y );
+}
+
+
+void GRFilledArc( EDA_RECT* ClipBox, wxDC* DC, int x, int y,
+                  double StAngle, double EndAngle, int r,
+                  EDA_COLOR_T Color, EDA_COLOR_T BgColor )
+{
+    GRFilledArc( ClipBox, DC, x, y, StAngle, EndAngle, r, 0, Color, BgColor );
+}
+
+
+/*
+ * Draw an arc in drawing space.
+ */
+void GRArc( EDA_RECT* ClipBox, wxDC* DC, int xc, int yc, double StAngle,
+            double EndAngle, int r, EDA_COLOR_T Color )
+{
+    int x1, y1, x2, y2;
+
+    /* Clip arcs off screen */
+    if( ClipBox )
+    {
+        int radius = r + 1;
+        int x0, y0, xm, ym, x, y;
+        x0 = ClipBox->GetX();
+        y0 = ClipBox->GetY();
+        xm = ClipBox->GetRight();
+        ym = ClipBox->GetBottom();
+        x = xc;
+        y = yc;
+
+        if( x < ( x0 - radius ) )
+            return;
+        if( y < ( y0 - radius ) )
+            return;
+        if( x > ( xm + radius ) )
+            return;
+        if( y > ( ym + radius ) )
+            return;
+    }
+
+    x1 = r;
+    y1 = 0;
+    RotatePoint( &x1, &y1, EndAngle );
+
+    x2 = r;
+    y2 = 0;
+    RotatePoint( &x2, &y2, StAngle );
+
+    GRSetBrush( DC, Color, NOT_FILLED );
+    GRSetColorPen( DC, Color );
+    DC->DrawArc( xc + x1, yc - y1, xc + x2, yc - y2, xc, yc );
+}
+
+
+/*
+ * Draw an arc with width = width in drawing space.
+ */
+void GRArc( EDA_RECT* ClipBox,
+            wxDC*     DC,
+            int       x,
+            int       y,
+            double    StAngle,
+            double    EndAngle,
+            int       r,
+            int       width,
+            EDA_COLOR_T       Color )
+{
+    int x1, y1, x2, y2;
+
+    /* Clip arcs off screen. */
+    if( ClipBox )
+    {
+        int x0, y0, xm, ym;
+        x0 = ClipBox->GetX();
+        y0 = ClipBox->GetY();
+        xm = ClipBox->GetRight();
+        ym = ClipBox->GetBottom();
+
+        if( x < ( x0 - r - width ) )
+            return;
+
+        if( y < ( y0 - r - width ) )
+            return;
+
+        if( x > ( r + xm + width ) )
+            return;
+
+        if( y > ( r + ym + width ) )
+            return;
+    }
+
+    x1 = r;
+    y1 = 0;
+    RotatePoint( &x1, &y1, EndAngle );
+
+    x2 = r;
+    y2 = 0;
+    RotatePoint( &x2, &y2, StAngle );
+
+    GRSetBrush( DC, Color );
+    GRSetColorPen( DC, Color, width );
+    DC->DrawArc( x + x1, y - y1, x + x2, y - y2, x, y );
+}
+
+
+/*
+ * Draw a rectangle in drawing space.
+ */
+void GRRect( EDA_RECT* aClipBox, wxDC* aDC, int x1, int y1, int x2, int y2, EDA_COLOR_T aColor )
+{
+    GRSRect( aClipBox, aDC, x1, y1, x2, y2, 0, aColor );
+}
+
+
+void GRRectPs( EDA_RECT* aClipBox, wxDC* aDC, const EDA_RECT& aRect, EDA_COLOR_T aColor, wxPenStyle aStyle )
+{
+    int x1 = aRect.GetX();
+    int y1 = aRect.GetY();
+    int x2 = aRect.GetRight();
+    int y2 = aRect.GetBottom();
+
+    GRSRect( aClipBox, aDC, x1, y1, x2, y2, 0, aColor, aStyle );
+}
+
+
+/*
+ * Draw a rectangle (thick lines) in drawing space.
+ */
+void GRRect( EDA_RECT* ClipBox, wxDC* DC, int x1, int y1, int x2, int y2, int width, EDA_COLOR_T Color )
+{
+    GRSRect( ClipBox, DC, x1, y1, x2, y2, width, Color );
+}
+
+
+void GRRect( EDA_RECT* aClipBox, wxDC* aDC, const EDA_RECT& aRect, int aWidth, EDA_COLOR_T aColor )
+{
+    int x1 = aRect.GetX();
+    int y1 = aRect.GetY();
+    int x2 = aRect.GetRight();
+    int y2 = aRect.GetBottom();
+
+    GRSRect( aClipBox, aDC, x1, y1, x2, y2, aWidth, aColor );
+}
+
+
+/*
+ * Draw a rectangle (filled with AreaColor) in drawing space.
+ */
+void GRFilledRect( EDA_RECT* ClipBox, wxDC* DC, int x1, int y1, int x2, int y2,
+                   EDA_COLOR_T Color, EDA_COLOR_T BgColor )
+{
+    GRSFilledRect( ClipBox, DC, x1, y1, x2, y2, 0, Color, BgColor );
+}
+
+
+/*
+ * Draw a rectangle (filled with AreaColor) in drawing space.
+ */
+void GRFilledRect( EDA_RECT* ClipBox, wxDC* DC, int x1, int y1, int x2, int y2,
+                   int width, EDA_COLOR_T Color, EDA_COLOR_T BgColor )
+{
+    GRSFilledRect( ClipBox, DC, x1, y1, x2, y2, width, Color, BgColor );
+}
+
+
+/*
+ * Draw a rectangle in screen space.
+ */
+
+void GRSRect( EDA_RECT* aClipBox, wxDC* aDC, int x1, int y1, int x2, int y2,
+              int aWidth, EDA_COLOR_T aColor, wxPenStyle aStyle )
+{
+    wxPoint points[5];
+    points[0] = wxPoint(x1, y1);
+    points[1] = wxPoint(x1, y2);
+    points[2] = wxPoint(x2, y2);
+    points[3] = wxPoint(x2, y1);
+    points[4] = points[0];
+    GRSClosedPoly( aClipBox, aDC, 5, points, NOT_FILLED, aWidth,
+                           aColor, aColor );
+}
+
+
+void GRSFilledRect( EDA_RECT* aClipBox, wxDC* aDC, int x1, int y1, int x2, int y2,
+                    int aWidth, EDA_COLOR_T aColor, EDA_COLOR_T aBgColor )
+{
+    wxPoint points[5];
+    points[0] = wxPoint(x1, y1);
+    points[1] = wxPoint(x1, y2);
+    points[2] = wxPoint(x2, y2);
+    points[3] = wxPoint(x2, y1);
+    points[4] = points[0];
+
+    GRSetBrush( aDC, aBgColor, FILLED );
+    GRSetColorPen( aDC, aBgColor, aWidth );
+
+    if( aClipBox && (aWidth > 0) )
+    {
+        EDA_RECT clipbox(*aClipBox);
+        clipbox.Inflate(aWidth);
+        ClipAndDrawPoly(&clipbox, aDC, points, 5); // polygon approach is more accurate
+    }
+    else
+        ClipAndDrawPoly(aClipBox, aDC, points, 5 );
+}
+
+/**
+ * Function ClipAndDrawPoly
+ *  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 unnecessary.
+ */
+
+/* Note: aClipBox == NULL is legal, so if aClipBox == NULL,
+ * the polygon is drawn, but not clipped
+ */
+#include <SutherlandHodgmanClipPoly.h>
+
+void ClipAndDrawPoly( EDA_RECT* aClipBox, wxDC* aDC, wxPoint aPoints[], int n )
+{
+    if( aClipBox == NULL )
+    {
+        aDC->DrawPolygon( n, aPoints );
+        return;
+    }
+
+    // A clip box exists: clip and draw the polygon.
+    static std::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( KiROUND( cit->X ), KiROUND( cit->Y ) ) );
+    }
+
+    if( clippedPolygon.size() )
+        aDC->DrawPolygon( clippedPolygon.size(), &clippedPolygon[0] );
+}
+
+
+void GRBezier( EDA_RECT* ClipBox,
+               wxDC*     DC,
+               int       x1,
+               int       y1,
+               int       x2,
+               int       y2,
+               int       x3,
+               int       y3,
+               int       width,
+               EDA_COLOR_T       Color )
+{
+    std::vector<wxPoint> Points = Bezier2Poly( x1, y1, x2, y2, x3, y3 );
+    GRPoly( ClipBox, DC, Points.size(), &Points[0], false, width, Color, Color );
+}
+
+
+void GRBezier( EDA_RECT* ClipBox,
+               wxDC*     DC,
+               int       x1,
+               int       y1,
+               int       x2,
+               int       y2,
+               int       x3,
+               int       y3,
+               int       x4,
+               int       y4,
+               int       width,
+               EDA_COLOR_T       Color )
+{
+    std::vector<wxPoint> Points = Bezier2Poly( x1, y1, x2, y2, x3, y3, x4, y4 );
+    GRPoly( ClipBox, DC, Points.size(), &Points[0], false, width, Color, Color );
+}
+
+
+void GRDrawAnchor( EDA_RECT *aClipBox, wxDC *aDC, int x, int y,
+                   int aSize, EDA_COLOR_T aColor )
+{
+        int anchor_size = aDC->DeviceToLogicalXRel( aSize );
+
+        GRLine( aClipBox, aDC,
+                x - anchor_size, y,
+                x + anchor_size, y, 0, aColor );
+        GRLine( aClipBox, aDC,
+                x, y - anchor_size,
+                x, y + anchor_size, 0, aColor );
+}