402 lines
12 KiB
C++
402 lines
12 KiB
C++
/*
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* This program source code file is part of KICAD, a free EDA CAD application.
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*
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* Copyright (C) 2012 Torsten Hueter, torstenhtr <at> gmx.de
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* Copyright (C) 2012 Kicad Developers, see change_log.txt for contributors.
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* Copyright (C) 2013 CERN
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* @author Maciej Suminski <maciej.suminski@cern.ch>
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*
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* Stroke font class
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, you may find one here:
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* http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
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* or you may search the http://www.gnu.org website for the version 2 license,
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* or you may write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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#include <gal/stroke_font.h>
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#include <gal/graphics_abstraction_layer.h>
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#include <wx/string.h>
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using namespace KIGFX;
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const double STROKE_FONT::OVERBAR_HEIGHT = 1.22;
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const double STROKE_FONT::BOLD_FACTOR = 1.3;
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const double STROKE_FONT::HERSHEY_SCALE = 1.0 / 21.0;
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STROKE_FONT::STROKE_FONT( GAL* aGal ) :
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m_gal( aGal ),
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m_bold( false ),
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m_italic( false ),
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m_mirrored( false ),
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m_overbar( false )
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{
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// Default values
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m_glyphSize = VECTOR2D( 10.0, 10.0 );
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m_verticalJustify = GR_TEXT_VJUSTIFY_BOTTOM;
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m_horizontalJustify = GR_TEXT_HJUSTIFY_LEFT;
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}
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bool STROKE_FONT::LoadNewStrokeFont( const char* const aNewStrokeFont[], int aNewStrokeFontSize )
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{
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m_glyphs.clear();
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m_glyphBoundingBoxes.clear();
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m_glyphs.resize( aNewStrokeFontSize );
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m_glyphBoundingBoxes.resize( aNewStrokeFontSize );
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for( int j = 0; j < aNewStrokeFontSize; j++ )
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{
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GLYPH glyph;
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double glyphStartX = 0.0;
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double glyphEndX = 0.0;
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VECTOR2D glyphBoundingX;
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std::deque<VECTOR2D> pointList;
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int i = 0;
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while( aNewStrokeFont[j][i] )
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{
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VECTOR2D point( 0.0, 0.0 );
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char coordinate[2] = { 0, };
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for( int k = 0; k < 2; k++ )
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{
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coordinate[k] = aNewStrokeFont[j][i + k];
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}
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if( i < 2 )
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{
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// The first two values contain the width of the char
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glyphStartX = ( coordinate[0] - 'R' ) * HERSHEY_SCALE;
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glyphEndX = ( coordinate[1] - 'R' ) * HERSHEY_SCALE;
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glyphBoundingX = VECTOR2D( 0, glyphEndX - glyphStartX );
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}
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else if( ( coordinate[0] == ' ' ) && ( coordinate[1] == 'R' ) )
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{
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// Raise pen
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if( pointList.size() > 0 )
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glyph.push_back( pointList );
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pointList.clear();
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}
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else
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{
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// Every coordinate description of the Hershey format has an offset,
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// it has to be subtracted
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point.x = (double) ( coordinate[0] - 'R' ) * HERSHEY_SCALE - glyphStartX;
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// -10 is here to keep GAL rendering consistent with the legacy gfx stuff
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point.y = (double) ( coordinate[1] - 'R' - 10) * HERSHEY_SCALE;
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pointList.push_back( point );
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}
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i += 2;
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}
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if( pointList.size() > 0 )
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glyph.push_back( pointList );
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m_glyphs[j] = glyph;
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// Compute the bounding box of the glyph
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m_glyphBoundingBoxes[j] = computeBoundingBox( glyph, glyphBoundingX );
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}
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return true;
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}
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int STROKE_FONT::getInterline() const
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{
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return ( m_glyphSize.y * 14 ) / 10 + m_gal->GetLineWidth();
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}
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BOX2D STROKE_FONT::computeBoundingBox( const GLYPH& aGLYPH, const VECTOR2D& aGLYPHBoundingX ) const
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{
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BOX2D boundingBox;
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std::deque<VECTOR2D> boundingPoints;
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boundingPoints.push_back( VECTOR2D( aGLYPHBoundingX.x, 0 ) );
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boundingPoints.push_back( VECTOR2D( aGLYPHBoundingX.y, 0 ) );
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for( GLYPH::const_iterator pointListIt = aGLYPH.begin(); pointListIt != aGLYPH.end(); ++pointListIt )
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{
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for( std::deque<VECTOR2D>::const_iterator pointIt = pointListIt->begin();
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pointIt != pointListIt->end(); ++pointIt )
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{
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boundingPoints.push_back( VECTOR2D( aGLYPHBoundingX.x, pointIt->y ) );
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}
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}
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boundingBox.Compute( boundingPoints );
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return boundingBox;
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}
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void STROKE_FONT::Draw( const UTF8& aText, const VECTOR2D& aPosition, double aRotationAngle )
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{
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if( aText.empty() )
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return;
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// Context needs to be saved before any transformations
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m_gal->Save();
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m_gal->Translate( aPosition );
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m_gal->Rotate( -aRotationAngle );
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// Single line height
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int lineHeight = getInterline( );
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int lineCount = linesCount( aText );
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// align the 1st line of text
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switch( m_verticalJustify )
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{
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case GR_TEXT_VJUSTIFY_TOP:
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m_gal->Translate( VECTOR2D( 0, m_glyphSize.y ) );
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break;
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case GR_TEXT_VJUSTIFY_CENTER:
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m_gal->Translate( VECTOR2D( 0, m_glyphSize.y / 2.0 ) );
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break;
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case GR_TEXT_VJUSTIFY_BOTTOM:
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break;
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default:
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break;
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}
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if( lineCount > 1 )
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{
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switch( m_verticalJustify )
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{
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case GR_TEXT_VJUSTIFY_TOP:
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break;
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case GR_TEXT_VJUSTIFY_CENTER:
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m_gal->Translate( VECTOR2D(0, -( lineCount - 1 ) * lineHeight / 2) );
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break;
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case GR_TEXT_VJUSTIFY_BOTTOM:
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m_gal->Translate( VECTOR2D(0, -( lineCount - 1 ) * lineHeight ) );
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break;
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}
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}
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m_gal->SetIsStroke( true );
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m_gal->SetIsFill( false );
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if( m_bold )
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m_gal->SetLineWidth( m_gal->GetLineWidth() * BOLD_FACTOR );
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// Split multiline strings into separate ones and draw them line by line
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size_t begin = 0;
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size_t newlinePos = aText.find( '\n' );
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while( newlinePos != aText.npos )
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{
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size_t length = newlinePos - begin;
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drawSingleLineText( aText.substr( begin, length ) );
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m_gal->Translate( VECTOR2D( 0.0, lineHeight ) );
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begin = newlinePos + 1;
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newlinePos = aText.find( '\n', begin );
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}
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// Draw the last (or the only one) line
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if( !aText.empty() )
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drawSingleLineText( aText.substr( begin ) );
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m_gal->Restore();
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}
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void STROKE_FONT::drawSingleLineText( const UTF8& aText )
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{
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// By default the overbar is turned off
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m_overbar = false;
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double xOffset;
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VECTOR2D glyphSize( m_glyphSize );
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double overbar_italic_comp = 0.0;
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// Compute the text size
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VECTOR2D textSize = computeTextSize( aText );
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m_gal->Save();
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// Adjust the text position to the given alignment
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switch( m_horizontalJustify )
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{
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case GR_TEXT_HJUSTIFY_CENTER:
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m_gal->Translate( VECTOR2D( -textSize.x / 2.0, 0 ) );
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break;
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case GR_TEXT_HJUSTIFY_RIGHT:
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if( !m_mirrored )
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m_gal->Translate( VECTOR2D( -textSize.x, 0 ) );
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break;
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case GR_TEXT_HJUSTIFY_LEFT:
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if( m_mirrored )
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m_gal->Translate( VECTOR2D( -textSize.x, 0 ) );
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break;
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default:
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break;
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}
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if( m_mirrored )
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{
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// In case of mirrored text invert the X scale of points and their X direction
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// (m_glyphSize.x) and start drawing from the position where text normally should end
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// (textSize.x)
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xOffset = textSize.x;
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glyphSize.x = -m_glyphSize.x;
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}
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else
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{
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xOffset = 0.0;
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}
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// The overbar is indented inward at the beginning of an italicized section, but
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// must not be indented on subsequent letters to ensure that the bar segments
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// overlap.
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bool last_had_overbar = false;
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for( UTF8::uni_iter chIt = aText.ubegin(), end = aText.uend(); chIt < end; ++chIt )
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{
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// Toggle overbar
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if( *chIt == '~' )
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{
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if( ++chIt >= end )
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break;
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if( *chIt != '~' ) // It was a single tilda, it toggles overbar
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m_overbar = !m_overbar;
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// If it is a double tilda, just process the second one
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}
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int dd = *chIt - ' ';
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if( dd >= (int) m_glyphBoundingBoxes.size() || dd < 0 )
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dd = '?' - ' ';
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GLYPH& glyph = m_glyphs[dd];
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BOX2D& bbox = m_glyphBoundingBoxes[dd];
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if( m_overbar && m_italic )
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{
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if( m_mirrored )
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{
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overbar_italic_comp = (-m_glyphSize.y * OVERBAR_HEIGHT) / 8;
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}
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else
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{
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overbar_italic_comp = (m_glyphSize.y * OVERBAR_HEIGHT) / 8;
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}
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}
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if( m_overbar )
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{
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double overbar_start_x = xOffset;
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double overbar_start_y = -m_glyphSize.y * OVERBAR_HEIGHT;
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double overbar_end_x = xOffset + glyphSize.x * bbox.GetEnd().x;
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double overbar_end_y = -m_glyphSize.y * OVERBAR_HEIGHT;
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if( !last_had_overbar )
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{
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overbar_start_x += overbar_italic_comp;
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last_had_overbar = true;
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}
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VECTOR2D startOverbar( overbar_start_x, overbar_start_y );
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VECTOR2D endOverbar( overbar_end_x, overbar_end_y );
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m_gal->DrawLine( startOverbar, endOverbar );
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}
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else
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{
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last_had_overbar = false;
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}
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for( GLYPH::iterator pointListIt = glyph.begin(); pointListIt != glyph.end();
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++pointListIt )
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{
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std::deque<VECTOR2D> pointListScaled;
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for( std::deque<VECTOR2D>::iterator pointIt = pointListIt->begin();
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pointIt != pointListIt->end(); ++pointIt )
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{
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VECTOR2D pointPos( pointIt->x * glyphSize.x + xOffset, pointIt->y * glyphSize.y );
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if( m_italic )
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{
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// FIXME should be done other way - referring to the lowest Y value of point
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// because now italic fonts are translated a bit
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if( m_mirrored )
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pointPos.x += pointPos.y * 0.1;
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else
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pointPos.x -= pointPos.y * 0.1;
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}
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pointListScaled.push_back( pointPos );
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}
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m_gal->DrawPolyline( pointListScaled );
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}
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xOffset += glyphSize.x * bbox.GetEnd().x;
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}
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m_gal->Restore();
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}
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VECTOR2D STROKE_FONT::computeTextSize( const UTF8& aText ) const
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{
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VECTOR2D result = VECTOR2D( 0.0, m_glyphSize.y );
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for( UTF8::uni_iter it = aText.ubegin(), end = aText.uend(); it < end; ++it )
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{
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wxASSERT_MSG( *it != '\n',
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wxT( "This function is intended to work with single line strings" ) );
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// If it is double tilda, then it is displayed as a single tilda
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// If it is single tilda, then it is toggling overbar, so we need to skip it
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if( *it == '~' )
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{
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if( ++it >= end )
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break;
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}
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// Index in the bounding boxes table
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int dd = *it - ' ';
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if( dd >= (int) m_glyphBoundingBoxes.size() || dd < 0 )
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dd = '?' - ' ';
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result.x += m_glyphSize.x * m_glyphBoundingBoxes[dd].GetEnd().x;
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}
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return result;
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}
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