107 lines
3.0 KiB
C++
107 lines
3.0 KiB
C++
/*
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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) 2017 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 <preview_items/centreline_rect_item.h>
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#include <preview_items/two_point_geom_manager.h>
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#include <gal/graphics_abstraction_layer.h>
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#include <view/view.h>
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using namespace KIGFX::PREVIEW;
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static SHAPE_POLY_SET getRectangleAlongCentreLine( const VECTOR2D& aClStart,
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const VECTOR2D& aClEnd, double aAspect )
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{
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SHAPE_POLY_SET poly;
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poly.NewOutline();
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/*
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* The point layout of the rectangle goes like this,
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* but start/end don't have to be horz/vert
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*
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* 0 ---------------- 1 -----
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* | | ^
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* s--------cl------->e |cl|/aspect
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* | | v
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* 3----------------- 2 -----
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*/
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// vector down the centre line of the rectangle
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VECTOR2D cl = aClEnd - aClStart;
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// don't allow degenerate polygons
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if( cl.x == 0 && cl.y == 0 )
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cl.x = 1.0;
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// the "side" of the rectangle is the centre line rotated by 90 deg
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// and scaled by the aspect ratio
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VECTOR2D side = cl.Rotate( M_PI / 2.0 ) * aAspect;
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VECTOR2D pt = aClStart + ( side / 2.0 );
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poly.Append( pt );
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pt += cl;
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poly.Append( pt );
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pt -= side;
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poly.Append( pt );
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pt -= cl;
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poly.Append( pt );
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return poly;
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}
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CENTRELINE_RECT_ITEM::CENTRELINE_RECT_ITEM(
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const TWO_POINT_GEOMETRY_MANAGER& aGeomMgr,
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double aAspect ):
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m_geomMgr( aGeomMgr ),
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m_aspect( aAspect )
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{
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}
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SHAPE_POLY_SET CENTRELINE_RECT_ITEM::getOutline() const
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{
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return getRectangleAlongCentreLine( m_geomMgr.GetOrigin(),
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m_geomMgr.GetEnd(),
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m_aspect );
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}
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const BOX2I CENTRELINE_RECT_ITEM::ViewBBox() const
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{
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return getOutline().BBox();
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}
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void CENTRELINE_RECT_ITEM::drawPreviewShape( KIGFX::VIEW* aView ) const
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{
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auto& gal = *aView->GetGAL();
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gal.DrawLine( m_geomMgr.GetOrigin(), m_geomMgr.GetEnd() );
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gal.DrawPolygon( getOutline() );
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}
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