262 lines
9.3 KiB
C++
262 lines
9.3 KiB
C++
/**
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* @file convert_basic_shapes_to_polygon.cpp
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*/
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/*
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* This program source code file is part of KiCad, a free EDA CAD application.
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*
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* Copyright (C) 2012 Jean-Pierre Charras, jp.charras at wanadoo.fr
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* Copyright (C) 1992-2012 KiCad Developers, see change_log.txt for contributors.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, you may find one here:
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* http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
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* or you may search the http://www.gnu.org website for the version 2 license,
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* or you may write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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#include <vector>
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#include <fctsys.h>
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#include <trigo.h>
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#include <macros.h>
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#include <common.h>
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#include <convert_basic_shapes_to_polygon.h>
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/**
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* Function TransformCircleToPolygon
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* convert a circle to a polygon, using multiple straight lines
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* @param aCornerBuffer = a buffer to store the polygon
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* @param aCenter = the center of the circle
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* @param aRadius = the radius of the circle
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* @param aCircleToSegmentsCount = the number of segments to approximate a circle
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* Note: the polygon is inside the circle, so if you want to have the polygon
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* outside the circle, you should give aRadius calculated with a corrrection factor
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*/
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void TransformCircleToPolygon( CPOLYGONS_LIST& aCornerBuffer,
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wxPoint aCenter, int aRadius,
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int aCircleToSegmentsCount )
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{
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wxPoint corner_position;
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int delta = 3600 / aCircleToSegmentsCount; // rot angle in 0.1 degree
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int halfstep = 1800 / aCircleToSegmentsCount; // the starting value for rot angles
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for( int ii = 0; ii < aCircleToSegmentsCount; ii++ )
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{
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corner_position.x = aRadius;
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corner_position.y = 0;
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int angle = (ii * delta) + halfstep;
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RotatePoint( &corner_position.x, &corner_position.y, angle );
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corner_position += aCenter;
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CPolyPt polypoint( corner_position.x, corner_position.y );
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aCornerBuffer.Append( polypoint );
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}
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aCornerBuffer.CloseLastContour();
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}
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/**
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* Function TransformRoundedEndsSegmentToPolygon
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* convert a segment with rounded ends to a polygon
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* Convert arcs to multiple straight lines
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* @param aCornerBuffer = a buffer to store the polygon
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* @param aStart = the segment start point coordinate
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* @param aEnd = the segment end point coordinate
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* @param aCircleToSegmentsCount = the number of segments to approximate a circle
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* @param aWidth = the segment width
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* Note: the polygon is inside the arc ends, so if you want to have the polygon
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* outside the circle, you should give aStart and aEnd calculated with a correction factor
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*/
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void TransformRoundedEndsSegmentToPolygon( CPOLYGONS_LIST& aCornerBuffer,
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wxPoint aStart, wxPoint aEnd,
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int aCircleToSegmentsCount,
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int aWidth )
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{
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int radius = aWidth / 2;
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wxPoint endp = aEnd - aStart; // end point coordinate for the same segment starting at (0,0)
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wxPoint startp = aStart;
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wxPoint corner;
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CPolyPt polypoint;
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// normalize the position in order to have endp.x >= 0;
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if( endp.x < 0 )
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{
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endp = aStart - aEnd;
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startp = aEnd;
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}
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double delta_angle = ArcTangente( endp.y, endp.x ); // delta_angle is in 0.1 degrees
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int seg_len = KiROUND( EuclideanNorm( endp ) );
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int delta = 3600 / aCircleToSegmentsCount; // rot angle in 0.1 degree
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// Compute the outlines of the segment, and creates a polygon
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// add right rounded end:
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for( int ii = 0; ii < 1800; ii += delta )
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{
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corner = wxPoint( 0, radius );
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RotatePoint( &corner, ii );
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corner.x += seg_len;
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RotatePoint( &corner, -delta_angle );
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corner += startp;
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polypoint.x = corner.x;
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polypoint.y = corner.y;
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aCornerBuffer.Append( polypoint );
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}
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// Finish arc:
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corner = wxPoint( seg_len, -radius );
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RotatePoint( &corner, -delta_angle );
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corner += startp;
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polypoint.x = corner.x;
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polypoint.y = corner.y;
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aCornerBuffer.Append( polypoint );
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// add left rounded end:
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for( int ii = 0; ii < 1800; ii += delta )
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{
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corner = wxPoint( 0, -radius );
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RotatePoint( &corner, ii );
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RotatePoint( &corner, -delta_angle );
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corner += startp;
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polypoint.x = corner.x;
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polypoint.y = corner.y;
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aCornerBuffer.Append( polypoint );
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}
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// Finish arc:
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corner = wxPoint( 0, radius );
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RotatePoint( &corner, -delta_angle );
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corner += startp;
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polypoint.x = corner.x;
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polypoint.y = corner.y;
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aCornerBuffer.Append( polypoint );
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aCornerBuffer.CloseLastContour();
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}
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/**
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* Function TransformArcToPolygon
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* Creates a polygon from an Arc
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* Convert arcs to multiple straight segments
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* @param aCornerBuffer = a buffer to store the polygon
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* @param aCentre = centre of the arc or circle
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* @param aStart = start point of the arc, or a point on the circle
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* @param aArcAngle = arc angle in 0.1 degrees. For a circle, aArcAngle = 3600
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* @param aCircleToSegmentsCount = the number of segments to approximate a circle
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* @param aWidth = width (thickness) of the line
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*/
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void TransformArcToPolygon( CPOLYGONS_LIST& aCornerBuffer,
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wxPoint aCentre, wxPoint aStart, double aArcAngle,
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int aCircleToSegmentsCount, int aWidth )
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{
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wxPoint arc_start, arc_end;
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int delta = 3600 / aCircleToSegmentsCount; // rotate angle in 0.1 degree
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arc_end = arc_start = aStart;
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if( aArcAngle != 3600 )
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{
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RotatePoint( &arc_end, aCentre, -aArcAngle );
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}
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if( aArcAngle < 0 )
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{
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EXCHG( arc_start, arc_end );
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NEGATE( aArcAngle );
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}
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// Compute the ends of segments and creates poly
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wxPoint curr_end = arc_start;
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wxPoint curr_start = arc_start;
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for( int ii = delta; ii < aArcAngle; ii += delta )
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{
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curr_end = arc_start;
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RotatePoint( &curr_end, aCentre, -ii );
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TransformRoundedEndsSegmentToPolygon( aCornerBuffer, curr_start, curr_end,
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aCircleToSegmentsCount, aWidth );
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curr_start = curr_end;
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}
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if( curr_end != arc_end )
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TransformRoundedEndsSegmentToPolygon( aCornerBuffer,
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curr_end, arc_end,
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aCircleToSegmentsCount, aWidth );
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}
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/**
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* Function TransformRingToPolygon
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* Creates a polygon from a ring
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* Convert arcs to multiple straight segments
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* @param aCornerBuffer = a buffer to store the polygon
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* @param aCentre = centre of the arc or circle
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* @param aRadius = radius of the circle
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* @param aCircleToSegmentsCount = the number of segments to approximate a circle
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* @param aWidth = width (thickness) of the ring
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*/
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void TransformRingToPolygon( CPOLYGONS_LIST& aCornerBuffer,
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wxPoint aCentre, int aRadius,
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int aCircleToSegmentsCount, int aWidth )
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{
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int delta = 3600 / aCircleToSegmentsCount; // rotate angle in 0.1 degree
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// Compute the corners posituions and creates poly
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wxPoint curr_point;
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int inner_radius = aRadius - ( aWidth / 2 );
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int outer_radius = inner_radius + aWidth;
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CPolyPt polycorner;
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// Draw the inner circle of the ring
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for( int ii = 0; ii < 3600; ii += delta )
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{
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curr_point.x = inner_radius;
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curr_point.y = 0;
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RotatePoint( &curr_point, ii );
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curr_point += aCentre;
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polycorner.x = curr_point.x;
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polycorner.y = curr_point.y;
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aCornerBuffer.Append( polycorner );
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}
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// Draw the last point of inner circle
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polycorner.x = aCentre.x + inner_radius;
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polycorner.y = aCentre.y;
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aCornerBuffer.Append( polycorner );
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// Draw the outer circle of the ring
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for( int ii = 0; ii < 3600; ii += delta )
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{
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curr_point.x = outer_radius;
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curr_point.y = 0;
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RotatePoint( &curr_point, -ii );
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curr_point += aCentre;
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polycorner.x = curr_point.x;
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polycorner.y = curr_point.y;
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aCornerBuffer.Append( polycorner );
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}
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// Draw the last point of outer circle
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polycorner.x = aCentre.x + outer_radius;
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polycorner.y = aCentre.y;
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aCornerBuffer.Append( polycorner );
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// Close the polygon
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polycorner.x = aCentre.x + inner_radius;
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polycorner.end_contour = true;
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aCornerBuffer.Append( polycorner );
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}
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