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kicad/common/gr_basic.cpp

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/*
* This program source code file is part of KiCad, a free EDA CAD application.
*
* Copyright (C) 2015 Jean-Pierre Charras, jp.charras at wanadoo.fr
* Copyright (C) 2011 Wayne Stambaugh <stambaughw@gmail.com>
* Copyright (C) 1992-2021 KiCad Developers, see AUTHORS.txt for contributors.
*
* 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/>.
*/
#include <gr_basic.h>
#include <trigo.h>
#include <eda_item.h>
#include <math_for_graphics.h>
#include <wx/graphics.h>
#include <geometry/geometry_utils.h>
#include <math/util.h> // for KiROUND
#include <algorithm>
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, const VECTOR2I* 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, const COLOR4D& aColor );
/**/
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 COLOR4D s_DC_lastbrushcolor( 0, 0, 0, 0 );
static bool s_DC_lastbrushfill = false;
static wxDC* s_DC_lastDC = nullptr;
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 );
}
void GRResetPenAndBrush( wxDC* DC )
{
GRSetBrush( DC, BLACK ); // Force no fill
s_DC_lastbrushcolor = COLOR4D::UNSPECIFIED;
s_DC_lastDC = nullptr;
}
void GRSetColorPen( wxDC* DC, const COLOR4D& Color, int width, wxPenStyle style )
{
COLOR4D color = Color;
wxDash dots[2] = { 1, 3 };
// 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 = COLOR4D::BLACK;
const wxPen& curr_pen = DC->GetPen();
if( !curr_pen.IsOk() || curr_pen.GetColour() != color.ToColour()
|| curr_pen.GetWidth() != width || curr_pen.GetStyle() != style )
{
wxPen pen;
pen.SetColour( color.ToColour() );
if( style == wxPENSTYLE_DOT )
{
style = wxPENSTYLE_USER_DASH;
pen.SetDashes( 2, dots );
}
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, const COLOR4D& Color, bool fill )
{
COLOR4D color = Color;
if( s_ForceBlackPen )
color = COLOR4D::BLACK;
if( s_DC_lastbrushcolor != color || s_DC_lastbrushfill != fill || s_DC_lastDC != DC )
{
wxBrush brush;
brush.SetColour( color.ToColour() );
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;
}
}
void GRForceBlackPen( bool flagforce )
{
s_ForceBlackPen = flagforce;
}
bool GetGRForceBlackPenState( void )
{
return s_ForceBlackPen;
}
void GRLine( EDA_RECT* ClipBox, wxDC* DC, int x1, int y1, int x2, int y2, int width,
const COLOR4D& Color, wxPenStyle aStyle)
{
GRSetColorPen( DC, Color, width, aStyle );
WinClipAndDrawLine( ClipBox, DC, x1, y1, x2, y2, width );
GRLastMoveToX = x2;
GRLastMoveToY = y2;
}
void GRLine( EDA_RECT* aClipBox, wxDC* aDC, const VECTOR2I& aStart, const VECTOR2I& aEnd,
int aWidth, const COLOR4D& aColor, wxPenStyle aStyle )
{
GRLine( aClipBox, aDC, aStart.x, aStart.y, aEnd.x, aEnd.y, aWidth, aColor, aStyle );
}
void GRMoveTo( int x, int y )
{
GRLastMoveToX = x;
GRLastMoveToY = y;
}
void GRLineTo( EDA_RECT* ClipBox, wxDC* DC, int x, int y, int width, const COLOR4D& Color )
{
GRLine( ClipBox, DC, GRLastMoveToX, GRLastMoveToY, x, y, width, Color );
}
void GRCSegm( EDA_RECT* ClipBox, wxDC* DC, int x1, int y1, int x2, int y2, int width,
int aPenSize, const COLOR4D& 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,
const COLOR4D& Color )
{
GRCSegm( ClipBox, DC, x1, y1, x2, y2, width, 0, Color );
}
void GRCSegm( EDA_RECT* aClipBox, wxDC* aDC, const VECTOR2I& aStart, const VECTOR2I& aEnd,
int aWidth, const COLOR4D& aColor )
{
GRCSegm( aClipBox, aDC, aStart.x, aStart.y, aEnd.x, aEnd.y, aWidth, 0, aColor );
}
void GRFillCSegm( EDA_RECT* ClipBox, wxDC* DC, int x1, int y1, int x2, int y2, int width,
const COLOR4D& Color )
{
GRSetColorPen( DC, Color, width );
WinClipAndDrawLine( ClipBox, DC, x1, y1, x2, y2, width );
}
void GRFilledSegment( EDA_RECT* aClipBox, wxDC* aDC, const VECTOR2I& aStart, const VECTOR2I& aEnd,
int aWidth, const COLOR4D& 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, const VECTOR2I* 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, const VECTOR2I* Points, bool Fill,
int width, const COLOR4D& Color, const COLOR4D& 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
{
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, const VECTOR2I* aPoints,
bool aFill, int aWidth, const COLOR4D& aColor, const COLOR4D& 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
{
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, const VECTOR2I* Points, bool Fill, int width,
const COLOR4D& Color, const COLOR4D& 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, const VECTOR2I* Points, bool Fill,
const COLOR4D& Color, const COLOR4D& BgColor )
{
GRClosedPoly( ClipBox, DC, n, Points, Fill, 0, Color, BgColor );
}
void GRClosedPoly( EDA_RECT* ClipBox, wxDC* DC, int n, const VECTOR2I* Points, bool Fill, int width,
const COLOR4D& Color, const COLOR4D& BgColor )
{
GRSClosedPoly( ClipBox, DC, n, Points, Fill, width, Color, BgColor );
}
static bool clipCircle( EDA_RECT* aClipBox, int xc, int yc, int r, int aWidth )
{
// Clip circles that are outside the ClipBox.
if( aClipBox )
{
int x0, y0, xm, ym;
x0 = aClipBox->GetX();
y0 = aClipBox->GetY();
xm = aClipBox->GetRight();
ym = aClipBox->GetBottom();
r += aWidth;
if( xc < ( x0 - r ) )
return true;
if( yc < ( y0 - r ) )
return true;
if( xc > ( r + xm ) )
return true;
if( yc > ( r + ym ) )
return true;
}
return false;
}
void GRCircle( EDA_RECT* ClipBox, wxDC* DC, int xc, int yc, int r, int width, const COLOR4D& Color )
{
if( clipCircle( ClipBox, xc, yc, r, width ) || r <= 0 )
return;
GRSetBrush( DC, Color, NOT_FILLED );
GRSetColorPen( DC, Color, width );
DC->DrawEllipse( xc - r, yc - r, r + r, r + r );
}
void GRCircle( EDA_RECT* aClipBox, wxDC* aDC, const VECTOR2I& aPos, int aRadius, int aWidth,
const COLOR4D& 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,
const COLOR4D& Color, const COLOR4D& BgColor )
{
if( clipCircle( ClipBox, x, y, r, width ) || r <= 0 )
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, const VECTOR2I& aPos, int aRadius,
const COLOR4D& aColor )
{
GRFilledCircle( aClipBox, aDC, aPos.x, aPos.y, aRadius, 0, aColor, aColor );
}
void GRArc1( EDA_RECT* ClipBox, wxDC* DC, int x1, int y1, int x2, int y2, int xc, int yc,
int width, const COLOR4D& 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, const VECTOR2I& aStart, const VECTOR2I& aEnd,
const VECTOR2I& aCenter, int aWidth, const COLOR4D& aColor )
{
GRArc1( aClipBox, aDC, aStart.x, aStart.y, aEnd.x, aEnd.y, aCenter.x, aCenter.y,
aWidth, aColor );
}
void GRFilledArc1( EDA_RECT* ClipBox, wxDC* DC, const VECTOR2I& aStart, const VECTOR2I& aEnd,
const VECTOR2I& aCenter, int width, const COLOR4D& Color,
const COLOR4D& BgColor )
{
/* 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( aStart.x, aStart.y, aCenter.x, aCenter.y ) );
if( aCenter.x < ( x0 - r ) )
return;
if( aCenter.y < ( y0 - r ) )
return;
if( aCenter.x > ( r + xm ) )
return;
if( aCenter.y > ( r + ym ) )
return;
}
GRSetBrush( DC, BgColor, FILLED );
GRSetColorPen( DC, Color, width );
DC->DrawArc( aStart.x, aStart.y, aEnd.x, aEnd.y, aCenter.x, aCenter.y );
}
void GRArc( EDA_RECT* ClipBox, wxDC* DC, int xc, int yc, double StAngle, double EndAngle, int r,
const COLOR4D& 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 );
}
void GRArc( EDA_RECT* ClipBox, wxDC* DC, int x, int y, double StAngle, double EndAngle, int r,
int width, const COLOR4D& 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 );
}
void GRRect( EDA_RECT* ClipBox, wxDC* DC, int x1, int y1, int x2, int y2, int width,
const COLOR4D& Color )
{
GRSRect( ClipBox, DC, x1, y1, x2, y2, width, Color );
}
void GRFilledRect( EDA_RECT* ClipBox, wxDC* DC, int x1, int y1, int x2, int y2,
const COLOR4D& Color, const COLOR4D& BgColor )
{
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,
const COLOR4D& Color, const COLOR4D& BgColor )
{
GRSFilledRect( ClipBox, DC, x1, y1, x2, y2, width, Color, BgColor );
}
void GRSRect( EDA_RECT* aClipBox, wxDC* aDC, int x1, int y1, int x2, int y2, int aWidth,
const COLOR4D& aColor )
{
VECTOR2I points[5];
points[0] = VECTOR2I( x1, y1 );
points[1] = VECTOR2I( x1, y2 );
points[2] = VECTOR2I( x2, y2 );
points[3] = VECTOR2I( 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,
const COLOR4D& aColor, const COLOR4D& aBgColor )
{
VECTOR2I points[5];
points[0] = VECTOR2I( x1, y1 );
points[1] = VECTOR2I( x1, y2 );
points[2] = VECTOR2I( x2, y2 );
points[3] = VECTOR2I( 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 );
}
}
/**
* 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.
*/
#include <SutherlandHodgmanClipPoly.h>
static void vector2IwxDrawPolygon( wxDC* aDC, const VECTOR2I* Points, int n )
{
wxPoint* points = new wxPoint[n];
for( int i = 0; i < n; i++ )
{
points[i] = wxPoint( Points[i].x, Points[i].y );
}
aDC->DrawPolygon( n, points );
delete[] points;
}
void ClipAndDrawPoly( EDA_RECT* aClipBox, wxDC* aDC, const VECTOR2I* Points, int n )
{
if( aClipBox == nullptr )
{
vector2IwxDrawPolygon( aDC, Points, n );
return;
}
// A clip box exists: clip and draw the polygon.
static std::vector<VECTOR2I> clippedPolygon;
static pointVector inputPolygon, outputPolygon;
inputPolygon.clear();
outputPolygon.clear();
clippedPolygon.clear();
for( int ii = 0; ii < n; ii++ )
inputPolygon.push_back( PointF( (REAL) Points[ii].x, (REAL) Points[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.emplace_back( KiROUND( cit->X ), KiROUND( cit->Y ) );
}
if( clippedPolygon.size() )
vector2IwxDrawPolygon( aDC, &clippedPolygon[0], clippedPolygon.size() );
}
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