two_point_assistant.cpp

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/*
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2020 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/two_point_assistant.h>
#include <preview_items/draw_context.h>
#include <preview_items/preview_utils.h>
#include <view/view.h>


using namespace KIGFX::PREVIEW;

TWO_POINT_ASSISTANT::TWO_POINT_ASSISTANT( const TWO_POINT_GEOMETRY_MANAGER& aManager,
 EDA_UNITS aUnits, GEOM_SHAPE aShape ) :
 EDA_ITEM( NOT_USED ),
 m_constructMan( aManager ),
 m_units( aUnits ),
 m_shape( aShape )
{
}


const BOX2I TWO_POINT_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;
}


void TWO_POINT_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;

 const VECTOR2I origin = m_constructMan.GetOrigin();
 const VECTOR2I end = m_constructMan.GetEnd();
 const VECTOR2I radVec = end - origin;

 if( radVec.x == 0 && radVec.y == 0 )
 {
 return; // text next to cursor jumps around a lot in this corner case
 }

 gal.ResetTextAttributes();

 std::vector<wxString> cursorStrings;

 if( m_shape == GEOM_SHAPE::SEGMENT )
 {
 cursorStrings.push_back( DimensionLabel( "l", radVec.EuclideanNorm(), m_units ) );
 }
 else if( m_shape == GEOM_SHAPE::RECT )
 {
 cursorStrings.push_back( DimensionLabel( "x", std::abs( radVec.x ), m_units ) );
 cursorStrings.push_back( DimensionLabel( "y", std::abs( radVec.y ), m_units ) );
 }
 else if( m_shape == GEOM_SHAPE::CIRCLE )
 {
 KIGFX::PREVIEW::DRAW_CONTEXT preview_ctx( *aView );
 preview_ctx.DrawLine( origin, end, false );

 cursorStrings.push_back( DimensionLabel( "r", radVec.EuclideanNorm(), m_units ) );
 }

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