kicad/common/origin_viewitem.cpp

/*
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2015 CERN
 * @author Maciej Suminski <maciej.suminski@cern.ch>
 *
 * 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 <class_drawpanel.h>
#include <draw_frame.h>
#include <origin_viewitem.h>
#include <gal/graphics_abstraction_layer.h>

using namespace KIGFX;

ORIGIN_VIEWITEM::ORIGIN_VIEWITEM( const COLOR4D& aColor, MARKER_STYLE aStyle, int aSize, const VECTOR2D& aPosition ) :
    BOARD_ITEM( nullptr, NOT_USED ),   // this item is never added to a BOARD so it needs no type
    m_position( aPosition ), m_size( aSize ), m_color( aColor ), m_style( aStyle ), m_drawAtZero( false )
{
}


ORIGIN_VIEWITEM::ORIGIN_VIEWITEM( const VECTOR2D& aPosition, STATUS_FLAGS flags ) :
    BOARD_ITEM( nullptr, NOT_USED ),   // this item is never added to a BOARD so it needs no type
    m_position( aPosition ), m_size( NOT_USED ), m_color( UNSPECIFIED_COLOR ), m_style( NONE ), m_drawAtZero( false )
{
    SetFlags( flags );
}


ORIGIN_VIEWITEM* ORIGIN_VIEWITEM::Clone() const
{
    return new ORIGIN_VIEWITEM( m_color, m_style, m_size, m_position );
}


const BOX2I ORIGIN_VIEWITEM::ViewBBox() const
{
    BOX2I bbox;

    // The origin item doesn't have a fixed size.  It is constant on the screen but
    // changes the effective BBox size based on the zoom level.
    // But we can't simply set it to the maximum size as this causes a splitting degeneracy
    // when compiling for Debian i386.  By modestly adjusting the bbox, we avoid the degeneracy
    // while keeping the origin visible at all zoom levels
    bbox.SetSize( VECTOR2I( INT_MAX - 2, INT_MAX - 2 ) );
    bbox.SetOrigin( VECTOR2I( INT_MIN / 2 + 1,  INT_MIN / 2 + 1 ) );

    return bbox;
}

void ORIGIN_VIEWITEM::ViewDraw( int, VIEW* aView ) const
{
    auto gal = aView->GetGAL();
    // Nothing to do if the target shouldn't be drawn at 0,0 and that's where the target is. This
    // mimics the Legacy canvas that doesn't display most targets at 0,0
    if( !m_drawAtZero && ( m_position.x == 0 ) && ( m_position.y == 0 ) )
        return;

    gal->SetIsStroke( true );
    gal->SetIsFill( false );
    gal->SetLineWidth( 1 );
    gal->SetStrokeColor( m_color );
    VECTOR2D scaledSize = aView->ToWorld( VECTOR2D( m_size, m_size ), false );

    // Draw a circle around the marker's centre point if the style demands it
    if( ( m_style == CIRCLE_CROSS ) || ( m_style == CIRCLE_DOT ) || ( m_style == CIRCLE_X ) )
        gal->DrawCircle( m_position, fabs( scaledSize.x ) );

    switch( m_style )
    {
        case NONE:
            break;

        case CROSS:
        case CIRCLE_CROSS:
            gal->DrawLine( m_position - VECTOR2D( scaledSize.x, 0 ),
                            m_position + VECTOR2D( scaledSize.x, 0 ) );
            gal->DrawLine( m_position - VECTOR2D( 0, scaledSize.y ),
                            m_position + VECTOR2D( 0, scaledSize.y ) );
            break;

        case X:
        case CIRCLE_X:
            gal->DrawLine( m_position - scaledSize, m_position + scaledSize );
            scaledSize.y = -scaledSize.y;
            gal->DrawLine( m_position - scaledSize, m_position + scaledSize );
            break;

        case DOT:
        case CIRCLE_DOT:
            gal->DrawCircle( m_position, scaledSize.x / 4 );
            break;
    }
}