graphics_abstraction_layer.cpp

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/*
 * This program source code file is part of KICAD, a free EDA CAD application.
 *
 * Copyright (C) 2012 Torsten Hueter, torstenhtr <at> gmx.de
 * Copyright (C) 2012-2017 Kicad Developers, see change_log.txt for contributors.
 *
 * Graphics Abstraction Layer (GAL) - base class
 *
 * 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 <wx/log.h>
 
#include <gal/graphics_abstraction_layer.h>
#include <gal/definitions.h>
#include <font/font.h>
 
#include <math/util.h> // for KiROUND
 
#include <cmath>
 
using namespace KIGFX;
 
 
GAL::GAL( GAL_DISPLAY_OPTIONS& aDisplayOptions ) :
 m_options( aDisplayOptions ),
 // m_currentNativeCursor is initialized with KICURSOR::DEFAULT value to avoid
 // if comparison with uninitialized value on SetNativeCursorStyle method.
 // Some classes inheriting from GAL has different SetNativeCursorStyle method
 // implementation and therefore it's called also on constructor
 // to change the value from DEFAULT to KICURSOR::ARROW
 m_currentNativeCursor( KICURSOR::DEFAULT )
{
 // Set the default values for the internal variables
 SetIsFill( false );
 SetIsStroke( true );
 SetFillColor( COLOR4D( 0.0, 0.0, 0.0, 0.0 ) );
 SetStrokeColor( COLOR4D( 1.0, 1.0, 1.0, 1.0 ) );
 SetLookAtPoint( VECTOR2D( 0, 0 ) );
 SetZoomFactor( 1.0 );
 SetRotation( 0.0 );
 // this value for SetWorldUnitLength is only suitable for Pcbnew.
 // Other editors/viewer must call SetWorldUnitLength with their internal units
 SetWorldUnitLength( 1e-9 /* 1 nm */ / 0.0254 /* 1 inch in meters */ );
 // wxDC::GetPPI() reports 96 DPI, but somehow this value
 // is the closest match to the legacy renderer
 SetScreenDPI( 91 );
 SetDepthRange( VECTOR2D( GAL::MIN_DEPTH, GAL::MAX_DEPTH ) );
 SetLayerDepth( 0.0 );
 SetFlip( false, false );
 SetLineWidth( 1.0f );
 computeWorldScale();
 SetAxesEnabled( false );
 
 // Set grid defaults
 SetGridVisibility( true );
 SetCoarseGrid( 10 );
 m_gridLineWidth = 0.5f;
 m_gridStyle = GRID_STYLE::LINES;
 m_gridMinSpacing = 10;
 
 // Initialize the cursor shape
 SetCursorColor( COLOR4D( 1.0, 1.0, 1.0, 1.0 ) );
 m_fullscreenCursor = false;
 m_forceDisplayCursor = false;
 SetCursorEnabled( false );
 
 // Initialize the native widget to an arrow cursor
 SetNativeCursorStyle( KICURSOR::ARROW );
 
 // Initialize text properties
 ResetTextAttributes();
 
 // subscribe for settings updates
 m_observerLink = m_options.Subscribe( this );
}
 
 
GAL::~GAL()
{
}
 
 
void GAL::OnGalDisplayOptionsChanged( const GAL_DISPLAY_OPTIONS& aOptions )
{
 // defer to the child class first
 updatedGalDisplayOptions( aOptions );
 
 // there is no refresh to do at this level
}
 
 
bool GAL::updatedGalDisplayOptions( const GAL_DISPLAY_OPTIONS& aOptions )
{
 bool refresh = false;
 
 if( m_options.m_gridStyle != m_gridStyle )
 {
 m_gridStyle = m_options.m_gridStyle;
 refresh = true;
 }
 
 if( m_options.m_gridLineWidth != m_gridLineWidth )
 {
 m_gridLineWidth = m_options.m_scaleFactor * m_options.m_gridLineWidth + 0.25;
 refresh = true;
 }
 
 if( m_options.m_gridMinSpacing != m_gridMinSpacing )
 {
 m_gridMinSpacing = m_options.m_gridMinSpacing;
 refresh = true;
 }
 
 if( m_options.m_axesEnabled != m_axesEnabled )
 {
 m_axesEnabled = m_options.m_axesEnabled;
 refresh = true;
 }
 
 if( m_options.m_forceDisplayCursor != m_forceDisplayCursor )
 {
 m_forceDisplayCursor = m_options.m_forceDisplayCursor;
 refresh = true;
 }
 
 if( m_options.m_fullscreenCursor != m_fullscreenCursor )
 {
 m_fullscreenCursor = m_options.m_fullscreenCursor;
 refresh = true;
 }
 
 // tell the derived class if the base class needs an update or not
 return refresh;
}
 
 
void GAL::ResetTextAttributes()
{
 // Tiny but non-zero - this will always need setting
 // there is no built-in default
 SetGlyphSize( { 1, 1 } );
 
 SetHorizontalJustify( GR_TEXT_H_ALIGN_CENTER );
 SetVerticalJustify( GR_TEXT_V_ALIGN_CENTER );
 
 SetFontBold( false );
 SetFontItalic( false );
 SetFontUnderlined( false );
 SetTextMirrored( false );
}
 
 
void GAL::ComputeWorldScreenMatrix()
{
 computeWorldScale();
 
 MATRIX3x3D translation;
 translation.SetIdentity();
 // We're deliberately dividing integers to avoid fractional pixel offsets.
 translation.SetTranslation( VECTOR2D( m_screenSize.x/2, m_screenSize.y/2 ) );
 
 MATRIX3x3D rotate;
 rotate.SetIdentity();
 rotate.SetRotation( m_rotation );
 
 MATRIX3x3D scale;
 scale.SetIdentity();
 scale.SetScale( VECTOR2D( m_worldScale, m_worldScale ) );
 
 MATRIX3x3D flip;
 flip.SetIdentity();
 flip.SetScale( VECTOR2D( m_globalFlipX ? -1.0 : 1.0, m_globalFlipY ? -1.0 : 1.0 ) );
 
 MATRIX3x3D lookat;
 lookat.SetIdentity();
 lookat.SetTranslation( -m_lookAtPoint );
 
 m_worldScreenMatrix = translation * rotate * flip * scale * lookat;
 m_screenWorldMatrix = m_worldScreenMatrix.Inverse();
}
 
 
BOX2D GAL::GetVisibleWorldExtents() const
{
 const MATRIX3x3D& matrix = GetScreenWorldMatrix();
 
 VECTOR2D halfSize = VECTOR2D( matrix.GetScale().x * m_screenSize.x * 0.5,
 matrix.GetScale().y * m_screenSize.y * 0.5 );
 
 BOX2D extents;
 extents.SetOrigin( GetLookAtPoint() - halfSize );
 extents.SetSize( halfSize * 2 );
 
 return extents;
}
 
 
double GAL::computeMinGridSpacing() const
{
 // just return the current value. This could be cleverer and take
 // into account other settings in future
 return m_gridMinSpacing;
}
 
 
VECTOR2D GAL::GetGridPoint( const VECTOR2D& aPoint ) const
{
#if 0
 // This old code expects a non zero grid size, which can be wrong here.
 return VECTOR2D( KiROUND( ( aPoint.x - m_gridOffset.x ) / m_gridSize.x ) * m_gridSize.x + m_gridOffset.x,
 KiROUND( ( aPoint.y - m_gridOffset.y ) / m_gridSize.y ) * m_gridSize.y + m_gridOffset.y );
#else
 // if grid size == 0.0 there is no grid, so use aPoint as grid reference position
 double cx = m_gridSize.x > 0.0 ? KiROUND( ( aPoint.x - m_gridOffset.x ) / m_gridSize.x ) * m_gridSize.x + m_gridOffset.x
 : aPoint.x;
 double cy = m_gridSize.y > 0.0 ? KiROUND( ( aPoint.y - m_gridOffset.y ) / m_gridSize.y ) * m_gridSize.y + m_gridOffset.y
 : aPoint.y;
 
 return VECTOR2D( cx, cy );
#endif
}
 
const int GAL::MIN_DEPTH = -1024;
const int GAL::MAX_DEPTH = 1023;
const int GAL::GRID_DEPTH = MAX_DEPTH - 1;
 
 
COLOR4D GAL::getCursorColor() const
{
 COLOR4D color = m_cursorColor;
 
 // dim the cursor if it's only on because it was forced
 // (this helps to provide a hint for active tools)
 if( !m_isCursorEnabled )
 color.a = color.a * 0.5;
 
 return color;
}
 
 
/*
 * Fallback for implementations that don't implement bitmap text: use stroke font
 */
void GAL::BitmapText( const wxString& aText, const VECTOR2I& aPosition, const EDA_ANGLE& aAngle )
{
 KIFONT::FONT* font = KIFONT::FONT::GetFont();
 
 if( aText.IsEmpty() )
 return;
 
 TEXT_ATTRIBUTES attrs = m_attributes;
 attrs.m_Angle = aAngle;
 attrs.m_Mirrored = m_globalFlipX; // Prevent text flipping when view is flipped
 
 // Bitmap font has different metrics than the stroke font so we compensate a bit before
 // stroking
 attrs.m_Size = VECTOR2I( m_attributes.m_Size.x, m_attributes.m_Size.y * 0.95 );
 attrs.m_StrokeWidth = GetLineWidth() * 0.74;
 
 font->Draw( this, aText, aPosition, attrs, KIFONT::METRICS::Default() );
}
 
 
bool GAL::SetNativeCursorStyle( KICURSOR aCursor )
{
 if( m_currentNativeCursor == aCursor )
 return false;
 
 m_currentNativeCursor = aCursor;
 
 return true;
}