arc_assistant.cpp

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/*
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2017 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 2
 * 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, you may find one here:
 * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
 * or you may search the http://www.gnu.org website for the version 2 license,
 * or you may write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
 */

#include <preview_items/arc_assistant.h>

#include <preview_items/draw_context.h>
#include <preview_items/preview_utils.h>

#include <gal/graphics_abstraction_layer.h>
#include <view/view.h>

#include <base_units.h>
#include <trigo.h>

using namespace KIGFX::PREVIEW;

ARC_ASSISTANT::ARC_ASSISTANT( const ARC_GEOM_MANAGER& aManager, EDA_UNITS aUnits ) :
 EDA_ITEM( NOT_USED ),
 m_constructMan( aManager ),
 m_units( aUnits )
{
}


const BOX2I ARC_ASSISTANT::ViewBBox() const
{
 BOX2I tmp;

 // no bounding box when no graphic shown
 if( m_constructMan.IsReset() )
 return tmp;

 // this is an edit-time artefact; no reason to try and be smart with the bounding box
 // (besides, we can't tell the text extents without a view to know what the scale is)
 tmp.SetMaximum();
 return tmp;
}


double getNormDeciDegFromRad( double aRadians )
{
 double degs = RAD2DECIDEG( aRadians );

 // normalise to +/- 360
 while( degs < -3600.0 )
 degs += 3600.0;

 while( degs > 3600.0 )
 degs -= 3600.0;

 return degs;
}


void ARC_ASSISTANT::ViewDraw( int aLayer, KIGFX::VIEW* aView ) const
{
 KIGFX::GAL& gal = *aView->GetGAL();

 // not in a position to draw anything
 if( m_constructMan.IsReset() )
 return;

 gal.ResetTextAttributes();

 const VECTOR2I origin = m_constructMan.GetOrigin();

 KIGFX::PREVIEW::DRAW_CONTEXT preview_ctx( *aView );

 // draw first radius line
 bool dimFirstLine = m_constructMan.GetStep() > ARC_GEOM_MANAGER::SET_START;

 preview_ctx.DrawLineWithAngleHighlight( origin, m_constructMan.GetStartRadiusEnd(),
 dimFirstLine );

 std::vector<wxString> cursorStrings;

 if( m_constructMan.GetStep() == ARC_GEOM_MANAGER::SET_START )
 {
 // haven't started the angle selection phase yet

 double initAngle = m_constructMan.GetStartAngle();

 // draw the radius guide circle
 preview_ctx.DrawCircle( origin, m_constructMan.GetRadius(), true );

 double degs = getNormDeciDegFromRad( initAngle );

 cursorStrings.push_back( DimensionLabel( wxT( "r" ), m_constructMan.GetRadius(), m_units ) );
 cursorStrings.push_back( DimensionLabel( wxString::FromUTF8( "θ" ), degs,
 EDA_UNITS::DEGREES ) );
 }
 else
 {
 preview_ctx.DrawLineWithAngleHighlight( origin, m_constructMan.GetEndRadiusEnd(), false );

 double start = m_constructMan.GetStartAngle();
 double subtended = m_constructMan.GetSubtended();
 double subtendedDeg = getNormDeciDegFromRad( subtended );
 double endAngleDeg = getNormDeciDegFromRad( start + subtended );

 // draw dimmed extender line to cursor
 preview_ctx.DrawLineWithAngleHighlight( origin, m_constructMan.GetLastPoint(), true );

 cursorStrings.push_back( DimensionLabel( wxString::FromUTF8( "Δθ" ), subtendedDeg,
 EDA_UNITS::DEGREES ) );
 cursorStrings.push_back( DimensionLabel( wxString::FromUTF8( "θ" ), endAngleDeg,
 EDA_UNITS::DEGREES ) );
 }

 // place the text next to cursor, on opposite side from radius
 DrawTextNextToCursor( aView, m_constructMan.GetLastPoint(),
 origin - m_constructMan.GetLastPoint(), cursorStrings,
 aLayer == LAYER_SELECT_OVERLAY );
}