kicad/common/preview_items/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/preview_utils.h>
#include <gal/graphics_abstraction_layer.h>
#include <view/view.h>
#include <common.h>
#include <base_units.h>
using namespace KIGFX::PREVIEW;
ARC_ASSISTANT::ARC_ASSISTANT( const ARC_GEOM_MANAGER& aManager ) :
EDA_ITEM( NOT_USED ),
m_constructMan( aManager )
{
}
const BOX2I ARC_ASSISTANT::ViewBBox() const
{
BOX2I tmp;
// no bounding box when no graphic shown
if( m_constructMan.IsReset() )
return tmp;
// just enclose the whle circular area
auto origin = m_constructMan.GetOrigin();
auto radius = m_constructMan.GetRadius();
VECTOR2D rVec( radius, radius );
tmp.SetOrigin( origin + rVec );
tmp.SetEnd( origin - rVec );
tmp.Normalize();
return tmp;
}
/**
* Get deci-degrees from radians, normalised to +/- 360.
*
* The normalisation is such that a negative angle will stay
* negative.
*/
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;
}
static const double ANGLE_EPSILON = 1e-9;
double angleIsSpecial( double aRadians )
{
return std::fabs( std::remainder( aRadians, M_PI_4 ) ) < ANGLE_EPSILON;
}
static void drawLineWithHilight( KIGFX::GAL& aGal,
const VECTOR2I& aStart, const VECTOR2I& aEnd, bool aDim )
{
const auto vec = aEnd - aStart;
COLOR4D strokeColor = PreviewOverlayDefaultColor();
if( angleIsSpecial( vec.Angle() ) )
strokeColor = PreviewOverlaySpecialAngleColor();
aGal.SetStrokeColor( strokeColor.WithAlpha( PreviewOverlayDeemphAlpha( aDim ) ) );
aGal.DrawLine( aStart, aEnd );
}
static void drawArcWithHilight( KIGFX::GAL& aGal,
const VECTOR2I& aOrigin, double aRad, double aStartAngle,
double aEndAngle )
{
COLOR4D color = PreviewOverlayDefaultColor();
if( angleIsSpecial( aStartAngle - aEndAngle ) )
color = PreviewOverlaySpecialAngleColor();
aGal.SetStrokeColor( color );
aGal.SetFillColor( color.WithAlpha( 0.2 ) );
// draw the angle reference arc
aGal.DrawArc( aOrigin, aRad, -aStartAngle, -aEndAngle );
}
void ARC_ASSISTANT::ViewDraw( int aLayer, KIGFX::VIEW* aView ) const
{
auto& gal = *aView->GetGAL();
// not in a position to draw anything
if( m_constructMan.IsReset() )
return;
gal.SetLineWidth( 1.0 );
gal.SetIsStroke( true );
gal.SetIsFill( true );
gal.ResetTextAttributes();
// constant text size on screen
SetConstantGlyphHeight( gal, 12.0 );
// angle reference arc size
const double innerRad = 12.0 / gal.GetWorldScale();
const auto origin = m_constructMan.GetOrigin();
// draw first radius line
bool dimFirstLine = m_constructMan.GetStep() > ARC_GEOM_MANAGER::SET_START;
drawLineWithHilight( gal, 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
auto initAngle = m_constructMan.GetStartAngle();
const auto angleRefLineEnd = m_constructMan.GetOrigin() + VECTOR2D( innerRad * 1.5, 0.0 );
gal.SetStrokeColor( PreviewOverlayDefaultColor() );
gal.DrawLine( origin, angleRefLineEnd );
// draw the angle reference arc
drawArcWithHilight( gal, origin, innerRad, initAngle, 0.0 );
double degs = getNormDeciDegFromRad( initAngle );
cursorStrings.push_back( DimensionLabel( "r", m_constructMan.GetRadius(), g_UserUnit ) );
cursorStrings.push_back( DimensionLabel( "θ", degs, DEGREES ) );
}
else
{
drawLineWithHilight( gal, origin, m_constructMan.GetEndRadiusEnd(), false );
auto start = m_constructMan.GetStartAngle();
auto subtended = m_constructMan.GetSubtended();
drawArcWithHilight( gal, origin, innerRad, start, start + subtended );
double subtendedDeg = getNormDeciDegFromRad( subtended );
double endAngleDeg = getNormDeciDegFromRad( start + subtended );
// draw dimmed extender line to cursor
drawLineWithHilight( gal, origin, m_constructMan.GetLastPoint(), true );
cursorStrings.push_back( DimensionLabel( "Δθ", subtendedDeg, DEGREES ) );
cursorStrings.push_back( DimensionLabel( "θ", endAngleDeg, DEGREES ) );
}
// FIXME: spaces choke OpenGL lp:1668455
for( auto& str : cursorStrings )
{
str.erase( std::remove( str.begin(), str.end(), ' ' ),
str.end() );
}
// place the text next to cursor, on opposite side from radius
DrawTextNextToCursor( gal, m_constructMan.GetLastPoint(),
origin - m_constructMan.GetLastPoint(),
cursorStrings );
}