draw_context.cpp

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/*
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2019-2023 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 <gal/graphics_abstraction_layer.h>
#include <preview_items/draw_context.h>
#include <preview_items/preview_utils.h>
#include <view/view.h>
 
using namespace KIGFX::PREVIEW;
 
using KIGFX::COLOR4D;
 
 
static constexpr double ANGLE_EPSILON = 1e-9;
 
static bool angleIsSpecial( EDA_ANGLE aAngle )
{
 return std::fabs( std::remainder( aAngle.AsRadians(), M_PI_4 ) ) < ANGLE_EPSILON;
}
 
 
static COLOR4D deemphasise( const COLOR4D& aColor, bool aDeEmphasised )
{
 return aColor.WithAlpha( PreviewOverlayDeemphAlpha( aDeEmphasised ) );
}
 
 
DRAW_CONTEXT::DRAW_CONTEXT( KIGFX::VIEW& aView )
 : m_gal( *aView.GetGAL() ),
 m_render_settings( *aView.GetPainter()->GetSettings() ),
 m_currLayer( LAYER_AUX_ITEMS ),
 m_lineWidth( 1.0f )
{
}
 
 
void DRAW_CONTEXT::DrawCircle( const VECTOR2I& aOrigin, double aRad, bool aDeEmphasised )
{
 const COLOR4D& color = m_render_settings.GetLayerColor( m_currLayer );
 
 m_gal.SetLineWidth( m_lineWidth );
 m_gal.SetStrokeColor( deemphasise( color, aDeEmphasised ) );
 m_gal.SetIsStroke( true );
 m_gal.SetIsFill( false );
 m_gal.DrawCircle( aOrigin, aRad );
}
 
 
void DRAW_CONTEXT::DrawCircleDashed( const VECTOR2I& aOrigin, double aRad, double aStepAngle,
 double aFillAngle, bool aDeEmphasised )
{
 const COLOR4D& color = m_render_settings.GetLayerColor( m_currLayer );
 
 m_gal.SetLineWidth( m_lineWidth );
 m_gal.SetStrokeColor( deemphasise( color, aDeEmphasised ) );
 m_gal.SetIsStroke( true );
 m_gal.SetIsFill( false );
 
 for( int i = 0; i < 360; i += aStepAngle )
 {
 m_gal.DrawArc( aOrigin, aRad, EDA_ANGLE( i, DEGREES_T ),
 EDA_ANGLE( i + aFillAngle, DEGREES_T ) );
 }
}
 
 
void DRAW_CONTEXT::DrawLine( const VECTOR2I& aStart, const VECTOR2I& aEnd, bool aDeEmphasised )
{
 COLOR4D strokeColor = m_render_settings.GetLayerColor( m_currLayer );
 
 m_gal.SetLineWidth( m_lineWidth );
 m_gal.SetIsStroke( true );
 m_gal.SetStrokeColor( deemphasise( strokeColor, aDeEmphasised ) );
 m_gal.DrawLine( aStart, aEnd );
}
 
 
void DRAW_CONTEXT::DrawLineDashed( const VECTOR2I& aStart, const VECTOR2I& aEnd, int aDashStep,
 int aDashFill, bool aDeEmphasised )
{
 COLOR4D strokeColor = m_render_settings.GetLayerColor( m_currLayer );
 
 m_gal.SetLineWidth( m_lineWidth );
 m_gal.SetIsStroke( true );
 m_gal.SetStrokeColor( deemphasise( strokeColor, aDeEmphasised ) );
 
 VECTOR2I delta = aEnd - aStart;
 int vecLen = delta.EuclideanNorm();
 
 for( int i = 0; i < vecLen; i += aDashStep )
 {
 VECTOR2I a = aStart + delta.Resize( i );
 VECTOR2I b = aStart + delta.Resize( std::min( i + aDashFill, vecLen ) );
 
 m_gal.DrawLine( a, b );
 }
}
 
 
void DRAW_CONTEXT::DrawLineWithAngleHighlight( const VECTOR2I& aStart, const VECTOR2I& aEnd,
 bool aDeEmphasised )
{
 const VECTOR2I vec = aEnd - aStart;
 COLOR4D strokeColor = m_render_settings.GetLayerColor( m_currLayer );
 
 if( angleIsSpecial( EDA_ANGLE( vec ) ) )
 strokeColor = getSpecialAngleColour();
 
 m_gal.SetLineWidth( m_lineWidth );
 m_gal.SetIsStroke( true );
 m_gal.SetStrokeColor( deemphasise( strokeColor, aDeEmphasised ) );
 m_gal.DrawLine( aStart, aEnd );
}
 
 
COLOR4D DRAW_CONTEXT::getSpecialAngleColour() const
{
 return m_render_settings.IsBackgroundDark() ? COLOR4D( 0.5, 1.0, 0.5, 1.0 ) :
 COLOR4D( 0.0, 0.7, 0.0, 1.0 );
}