kicad/include/gal/stroke_font.h

189 lines
6.1 KiB
C++

/*
* 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) 2013 CERN
* @author Maciej Suminski <maciej.suminski@cern.ch>
* Copyright (C) 2016 Kicad Developers, see change_log.txt for contributors.
*
* Stroke font 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
*/
#ifndef STROKE_FONT_H_
#define STROKE_FONT_H_
#include <deque>
#include <algorithm>
#include <utf8.h>
#include <eda_text.h>
#include <math/box2.h>
namespace KIGFX
{
class GAL;
typedef std::deque< std::deque<VECTOR2D> > GLYPH;
typedef std::vector<GLYPH> GLYPH_LIST;
/**
* @brief Class STROKE_FONT implements stroke font drawing.
*
* A stroke font is composed of lines.
*/
class STROKE_FONT
{
friend class GAL;
public:
/// Constructor
STROKE_FONT( GAL* aGal );
/**
* @brief Load the new stroke font.
*
* @param aNewStrokeFont is the pointer to the font data.
* @param aNewStrokeFontSize is the size of the font data.
* @return True, if the font was successfully loaded, else false.
*/
bool LoadNewStrokeFont( const char* const aNewStrokeFont[], int aNewStrokeFontSize );
/**
* @brief Draw a string.
*
* @param aText is the text to be drawn.
* @param aPosition is the text position in world coordinates.
* @param aRotationAngle is the text rotation angle in radians.
*/
void Draw( const UTF8& aText, const VECTOR2D& aPosition, double aRotationAngle );
/**
* Function SetGAL
* Changes Graphics Abstraction Layer used for drawing items for a new one.
* @param aGal is the new GAL instance.
*/
void SetGAL( GAL* aGal )
{
m_gal = aGal;
}
/**
* Compute the boundary limits of aText (the bounding box of all shapes).
* The overbar and alignment are not taken in account, '~' characters are skipped.
*
* @return a VECTOR2D giving the width and height of text.
*/
VECTOR2D ComputeStringBoundaryLimits( const UTF8& aText, const VECTOR2D& aGlyphSize,
double aGlyphThickness ) const;
/**
* Compute the vertical position of an overbar, sometimes used in texts.
* This is the distance between the text base line and the overbar.
* @param aGlyphHeight is the height (vertical size) of the text.
* @param aGlyphThickness is the thickness of the lines used to draw the text.
* @return the relative position of the overbar axis.
*/
double ComputeOverbarVerticalPosition( double aGlyphHeight, double aGlyphThickness ) const;
/**
* @brief Compute the distance (interline) between 2 lines of text (for multiline texts).
*
* @param aGlyphHeight is the height (vertical size) of the text.
* @return the interline.
*/
static double GetInterline( double aGlyphHeight );
private:
GAL* m_gal; ///< Pointer to the GAL
GLYPH_LIST m_glyphs; ///< Glyph list
std::vector<BOX2D> m_glyphBoundingBoxes; ///< Bounding boxes of the glyphs
/**
* @brief Compute the X and Y size of a given text. The text is expected to be
* a only one line text.
*
* @param aText is the text string (one line).
* @return the text size.
*/
VECTOR2D computeTextLineSize( const UTF8& aText ) const;
/**
* Compute the vertical position of an overbar, sometimes used in texts.
* This is the distance between the text base line and the overbar.
* @return the relative position of the overbar axis.
*/
double computeOverbarVerticalPosition() const;
/**
* @brief Compute the bounding box of a given glyph.
*
* @param aGlyph is the glyph.
* @param aGlyphBoundingX is the x-component of the bounding box size.
* @return is the complete bounding box size.
*/
BOX2D computeBoundingBox( const GLYPH& aGlyph, const VECTOR2D& aGlyphBoundingX ) const;
/**
* @brief Draws a single line of text. Multiline texts should be split before using the
* function.
*
* @param aText is the text to be drawn.
*/
void drawSingleLineText( const UTF8& aText );
/**
* @brief Returns number of lines for a given text.
*
* @param aText is the text to be checked.
* @return unsigned - The number of lines in aText.
*/
inline unsigned linesCount( const UTF8& aText ) const
{
if( aText.empty() )
return 0; // std::count does not work well with empty strings
else
// aText.end() - 1 is to skip a newline character that is potentially at the end
return std::count( aText.begin(), aText.end() - 1, '\n' ) + 1;
}
///> Factor that determines relative vertical position of the overbar.
static const double OVERBAR_POSITION_FACTOR;
///> Factor that determines relative line width for bold text.
static const double BOLD_FACTOR;
///> Scale factor for a glyph
static const double STROKE_FONT_SCALE;
///> Tilt factor for italic style (the is is the scaling factor
///> on dY relative coordinates to give a tilst shape
static const double ITALIC_TILT;
///> Factor that determines the pitch between 2 lines.
static const double INTERLINE_PITCH_RATIO;
};
} // namespace KIGFX
#endif // STROKE_FONT_H_