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Convert circle to polygon: minimize rounding errors. 

Fixes: lp:1735206
https://bugs.launchpad.net/kicad/+bug/1735206
This commit is contained in:
jean-pierre charras 2018-01-19 21:10:40 +01:00
parent ab2333bcf0
commit 673f03e595
1 changed files with 5 additions and 5 deletions
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10
common/convert_basic_shapes_to_polygon.cpp
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@ -4,8 +4,8 @@
/* /*
* This program source code file is part of KiCad, a free EDA CAD application. * This program source code file is part of KiCad, a free EDA CAD application.
* *
* Copyright (C) 2012 Jean-Pierre Charras, jp.charras at wanadoo.fr * Copyright (C) 2018 Jean-Pierre Charras, jp.charras at wanadoo.fr
* Copyright (C) 1992-2012 KiCad Developers, see change_log.txt for contributors. * Copyright (C) 1992-2018 KiCad Developers, see AUTHORS.txt for contributors.
* *
* This program is free software; you can redistribute it and/or * This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License * modify it under the terms of the GNU General Public License
@ -48,8 +48,8 @@ void TransformCircleToPolygon( SHAPE_POLY_SET& aCornerBuffer,
int aCircleToSegmentsCount ) int aCircleToSegmentsCount )
{ {
wxPoint corner_position; wxPoint corner_position;
int delta = 3600 / aCircleToSegmentsCount; // rot angle in 0.1 degree double delta = 3600.0 / aCircleToSegmentsCount; // rot angle in 0.1 degree
int halfstep = 1800 / aCircleToSegmentsCount; // the starting value for rot angles double halfstep = delta/2; // the starting value for rot angles
aCornerBuffer.NewOutline(); aCornerBuffer.NewOutline();
@ -57,7 +57,7 @@ void TransformCircleToPolygon( SHAPE_POLY_SET& aCornerBuffer,
{ {
corner_position.x = aRadius; corner_position.x = aRadius;
corner_position.y = 0; corner_position.y = 0;
int angle = (ii * delta) + halfstep; double angle = (ii * delta) + halfstep;
RotatePoint( &corner_position.x, &corner_position.y, angle ); RotatePoint( &corner_position.x, &corner_position.y, angle );
corner_position += aCenter; corner_position += aCenter;
aCornerBuffer.Append( corner_position.x, corner_position.y ); aCornerBuffer.Append( corner_position.x, corner_position.y );