LibBoard::QuadraticBezierCurve Struct Reference

A quadratic Bezier curve having 3 control points. NB. It is also a parabola arc. More...

#include <Board/Shapes.h>

Inheritance diagram for LibBoard::QuadraticBezierCurve:

Public Member Functions
	QuadraticBezierCurve (double x1, double y1, double x2, double y2, double x3, double y3, DGtal::Color pen, DGtal::Color fill, double lineWidth, const LineStyle style=SolidStyle, const LineCap cap=ButtCap, const LineJoin join=MiterJoin, int depthValue=-1)
void	flushPostscript (std::ostream &stream, const TransformEPS &transform) const
void	flushFIG (std::ostream &stream, const TransformFIG &transform, std::map< DGtal::Color, int > &colormap) const
void	flushSVG (std::ostream &stream, const TransformSVG &transform) const
void	flushCairo (cairo_t *cr, const TransformCairo &transform) const
void	flushTikZ (std::ostream &stream, const TransformTikZ &transform) const
const std::string &	name () const
Public Member Functions inherited from LibBoard::Triangle
	Triangle (const Point &p1, const Point &p2, const Point &p3, DGtal::Color pen, DGtal::Color fill, double lineWidth, const LineStyle style=SolidStyle, const LineCap cap=ButtCap, const LineJoin join=MiterJoin, int depthValue=-1)
	Triangle (const double x1, const double y1, const double x2, const double y2, const double x3, const double y3, DGtal::Color pen, DGtal::Color fill, double lineWidth, const LineStyle style=SolidStyle, const LineCap cap=ButtCap, const LineJoin join=MiterJoin, int depthValue=-1)
const std::string &	name () const
Triangle	rotated (double angle) const
Triangle	translated (double dx, double dy) const
Triangle	scaled (double sx, double sy) const
Triangle	scaled (double s) const
Triangle *	clone () const
Public Member Functions inherited from LibBoard::Polyline
	Polyline (const std::vector< Point > &points, bool closed, DGtal::Color penColor, DGtal::Color fillColor, double lineWidth, const LineStyle lineStyle=SolidStyle, const LineCap cap=ButtCap, const LineJoin join=MiterJoin, int depth=-1)
	Polyline (const Path &path, DGtal::Color penColor, DGtal::Color fillColor, double lineWidth, const LineStyle lineStyle=SolidStyle, const LineCap cap=ButtCap, const LineJoin join=MiterJoin, int depth=-1)
	Polyline (bool closed, DGtal::Color penColor, DGtal::Color fillColor, double lineWidth, const LineStyle lineStyle=SolidStyle, const LineCap cap=ButtCap, const LineJoin join=MiterJoin, int depth=-1)
Point	center () const
Polyline &	operator<< (const Point &p)
Point &	operator[] (const unsigned int n)
Polyline &	rotate (double angle, const Point &center)
Polyline	rotated (double angle, const Point &center) const
Polyline &	rotate (double angle)
Polyline	rotated (double angle) const
Polyline &	translate (double dx, double dy)
Polyline	translated (double dx, double dy) const
Shape &	scale (double sx, double sy)
Shape &	scale (double s)
Polyline	scaled (double sx, double sy) const
Polyline	scaled (double s) const
void	scaleAll (double s)
Rect	boundingBox () const
Public Member Functions inherited from LibBoard::Shape
	Shape (DGtal::Color penColor, DGtal::Color fillColor, double lineWidth, LineStyle style, const LineCap cap, const LineJoin join, int depth)
virtual	~Shape ()
bool	filled () const
Shape &	rotateDeg (double angle, const Point &center)
Shape &	rotateDeg (double angle)
Rect	bbox ()
Shape &	operator-- ()
Shape &	operator++ ()
int	depth () const
virtual void	depth (int)
virtual void	shiftDepth (int shift)
const DGtal::Color &	penColor () const
const DGtal::Color &	fillColor () const

Static Private Attributes
static const std::string	_name

Additional Inherited Members
Public Types inherited from LibBoard::Shape
enum	LineCap { ButtCap = 0 , RoundCap , SquareCap }
enum	LineJoin { MiterJoin = 0 , RoundJoin , BevelJoin }
enum	LineStyle {   SolidStyle = 0 , DashStyle , DotStyle , DashDotStyle ,   DashDotDotStyle , DashDotDotDotStyle }
Protected Member Functions inherited from LibBoard::Shape
std::string	svgProperties (const TransformSVG &transform) const
std::string	postscriptProperties () const
void	setCairoDashStyle (cairo_t *cr, LineStyle type) const
std::string	tikzProperties (const TransformTikZ &transform) const
Protected Attributes inherited from LibBoard::Polyline
Path	_path
Protected Attributes inherited from LibBoard::Shape
int	_depth
DGtal::Color	_penColor
DGtal::Color	_fillColor
double	_lineWidth
LineStyle	_lineStyle
LineCap	_lineCap
LineJoin	_lineJoin

Detailed Description

A quadratic Bezier curve having 3 control points. NB. It is also a parabola arc.

Definition at line 1160 of file Board/Shapes.h.

Constructor & Destructor Documentation

QuadraticBezierCurve()

LibBoard::QuadraticBezierCurve::QuadraticBezierCurve ( double x1, double y1, double x2, double y2, double x3, double y3, DGtal::Color pen, DGtal::Color fill, double lineWidth, const LineStyle style = SolidStyle, const LineCap cap = ButtCap, const LineJoin join = MiterJoin, int depthValue = -1 )

inline

Constructs a curve.

Parameters

x1	First coordinate of the start point.
y1	Second coordinate of the start point.
x2	First coordinate of the middle point.
y2	Second coordinate of the middle point.
x3	First coordinate of the end point.
y3	Second coordinate of the end point.
pen	Color of the curve.
fill	Color of the interior.
lineWidth	The line thickness.
style	Curve style
cap	Curve cap
join	Curve join
depthValue	The depth of the line.

Definition at line 1179 of file Board/Shapes.h.

    : Triangle(x1, y1, x2, y2, x3, y3, pen, fill, lineWidth, style, cap, join, depthValue) {}

References LibBoard::Shape::ButtCap, LibBoard::Shape::MiterJoin, LibBoard::Shape::SolidStyle, and LibBoard::Triangle::Triangle().

Member Function Documentation

flushCairo()

void LibBoard::QuadraticBezierCurve::flushCairo ( cairo_t * cr, const TransformCairo & transform ) const

virtual

Writes the cairo code of the shape in a cairo drawing context according to a transform.

Parameters

cr	The cairo drawing context.
transform	A 2D transform to be applied.

Reimplemented from LibBoard::Polyline.

Definition at line 2448 of file Shapes.cpp.

{
  double x1, y1, x2, y2, x3, y3, x4, y4; //coordinates of the control points
  _path[ 0 ].get(x1, y1);
  _path[ 1 ].get(x3, y3);
  _path[ 2 ].get(x4, y4);
  //we compute the two middle control points of a cubic Bezier curve
  //from the three control points of the quadratic Bezier curve
  x2 = x1 + 2/3.0*(x3-x1); 
  y2 = y1 + 2/3.0*(y3-y1); 
  x3 = x2 + 1/3.0*(x4-x1); 
  y3 = y2 + 1/3.0*(y4-y1); 
 
  cairo_save (cr);
 
  cairo_set_source_rgba (cr, _fillColor.red()/255.0, _fillColor.green()/255.0, _fillColor.blue()/255.0, 1.);
 
  cairo_move_to( cr, transform.mapX( x1 ), transform.mapY( y1 ) ); 
  cairo_curve_to( cr, transform.mapX( x2 ), transform.mapY( y2 ), 
                  transform.mapX( x3 ), transform.mapY( y3 ), 
                  transform.mapX( x4 ), transform.mapY( y4 ) ); 
 
  if ( filled() )
    {
      if ( _penColor != DGtal::Color::None )
        cairo_fill_preserve (cr);
      else
        cairo_fill (cr);
    }
      
  if ( _penColor != DGtal::Color::None )
    {
      cairo_set_source_rgba (cr, _penColor.red()/255.0, _penColor.green()/255.0, _penColor.blue()/255.0, 1.);
    
      cairo_set_line_width (cr, _lineWidth);
      cairo_set_line_cap (cr, cairoLineCap[_lineCap]);
      cairo_set_line_join (cr, cairoLineJoin[_lineJoin]);
      setCairoDashStyle (cr, _lineStyle);
 
      cairo_stroke (cr);
    }
    
  cairo_restore (cr);
}

References LibBoard::Shape::_fillColor, LibBoard::Shape::_lineCap, LibBoard::Shape::_lineJoin, LibBoard::Shape::_lineStyle, LibBoard::Shape::_lineWidth, LibBoard::Polyline::_path, LibBoard::Shape::_penColor, LibBoard::Shape::filled(), DGtal::Color::None, and LibBoard::Shape::setCairoDashStyle().

flushFIG()

void LibBoard::QuadraticBezierCurve::flushFIG ( std::ostream & stream, const TransformFIG & transform, std::map< DGtal::Color, int > & colormap ) const

virtual

Writes the FIG code of the shape in a stream according to a transform.

Parameters

stream	The output stream.
transform	A 2D transform to be applied.
colormap	A colormap.

Reimplemented from LibBoard::Polyline.

Definition at line 2416 of file Shapes.cpp.

{
  stream << "#FIXME: quadratic Bezier curve unimplemented" << std::endl; 
  Triangle::flushFIG(stream, transform, colormap); 
}

flushPostscript()

void LibBoard::QuadraticBezierCurve::flushPostscript ( std::ostream & stream, const TransformEPS & transform ) const

virtual

Writes the EPS code of the shape in a stream according to a transform.

Parameters

stream	The output stream.
transform	A 2D transform to be applied.

Reimplemented from LibBoard::Polyline.

Definition at line 2366 of file Shapes.cpp.

{
  double x1, y1, x2, y2, x3, y3, x4, y4; //coordinates of the control points
  _path[ 0 ].get(x1, y1);
  _path[ 1 ].get(x3, y3);
  _path[ 2 ].get(x4, y4);
  //we compute the two middle control points of a cubic Bezier curve
  //from the three control points of the quadratic Bezier curve
  x2 = x1 + 2/3.0*(x3-x1); 
  y2 = y1 + 2/3.0*(y3-y1); 
  x3 = x2 + 1/3.0*(x4-x1); 
  y3 = y2 + 1/3.0*(y4-y1); 
 
  stream << std::endl << "% Bezier curve" << std::endl;
  if ( _fillColor != DGtal::Color::None ) {
    stream << "n "
           << transform.mapX( x1 ) << " "
           << transform.mapY( y1 ) << " "
           << "m "
           << transform.mapX( x2 ) << " "
           << transform.mapY( y2 ) << " "
           << transform.mapX( x3 ) << " "
           << transform.mapY( y3 ) << " "
           << transform.mapX( x4 ) << " "
           << transform.mapY( y4 ) << " "
           << "curveto ";  
      _fillColor.flushPostscript( stream );
      stream << " " << postscriptProperties();
      stream << " fill" << std::endl;
  }
  if ( _penColor != DGtal::Color::None ) {
    stream << " " << postscriptProperties() << " "; 
    stream << "n "
           << transform.mapX( x1 ) << " "
           << transform.mapY( y1 ) << " "
           << "m "
           << transform.mapX( x2 ) << " "
           << transform.mapY( y2 ) << " "
           << transform.mapX( x3 ) << " "
           << transform.mapY( y3 ) << " "
           << transform.mapX( x4 ) << " "
           << transform.mapY( y4 ) << " "
           << "curveto ";  
    _penColor.flushPostscript( stream );
    stream << " stroke" << std::endl;
  }
}

References LibBoard::Shape::_fillColor, LibBoard::Polyline::_path, LibBoard::Shape::_penColor, DGtal::Color::None, and LibBoard::Shape::postscriptProperties().

flushSVG()

void LibBoard::QuadraticBezierCurve::flushSVG ( std::ostream & stream, const TransformSVG & transform ) const

virtual

Writes the SVG code of the shape in a stream according to a transform.

Parameters

stream	The output stream.
transform	A 2D transform to be applied.

Reimplemented from LibBoard::Polyline.

Definition at line 2425 of file Shapes.cpp.

{
  double x1, y1, x2, y2, x3, y3; //coordinates of the control points
  _path[ 0 ].get(x1, y1);
  _path[ 1 ].get(x2, y2);
  _path[ 2 ].get(x3, y3);
 
  stream << "<path ";
  stream << svgProperties( transform ) << " ";
  //first point 
  stream << "d='M " << transform.mapX( x1 );
  stream << "," << transform.mapY( y1 );
  //arc
  stream << " Q " << transform.mapX( x2 ) << "," << transform.mapY( y2 );
  //last point
  stream << " " << transform.mapX( x3 );
  stream << "," << transform.mapY( y3 );
  stream << "' />";
}

References LibBoard::Polyline::_path, and LibBoard::Shape::svgProperties().

flushTikZ()

void LibBoard::QuadraticBezierCurve::flushTikZ ( std::ostream & stream, const TransformTikZ & transform ) const

virtual

Writes the TikZ code of the shape in a stream according to a transform.

Parameters

stream	The output stream.
transform	A 2D transform to be applied.

Reimplemented from LibBoard::Polyline.

Definition at line 2496 of file Shapes.cpp.

{
  double x1, y1, x2, y2, x3, y3, x4, y4; //coordinates of the control points
  _path[ 0 ].get(x1, y1);
  _path[ 1 ].get(x3, y3);
  _path[ 2 ].get(x4, y4);
  //we compute the two middle control points of a cubic Bezier curve
  //from the three control points of the quadratic Bezier curve
  x2 = x1 + 2/3.0*(x3-x1); 
  y2 = y1 + 2/3.0*(y3-y1); 
  x3 = x2 + 1/3.0*(x4-x1); 
  y3 = y2 + 1/3.0*(y4-y1); 
 
  stream << "\\draw[" << tikzProperties(transform) << "] ("
         << transform.mapX( x1 ) << ',' << transform.mapY( y1 )
         << ") .. controls ("
         << transform.mapX( x2 ) << ',' << transform.mapY( y2 )
         << ") and ("
         << transform.mapX( x3 ) << ',' << transform.mapY( y3 )
         << ") .. ("
         << transform.mapX( x4 ) << ',' << transform.mapY( y4 )
         << ");" << std::endl;
}

References LibBoard::Polyline::_path, and LibBoard::Shape::tikzProperties().

name()

const std::string & LibBoard::QuadraticBezierCurve::name ( ) const

virtual

Returns the name of the shape (QuadraticBezierCurve)

Returns

object name

Reimplemented from LibBoard::Polyline.

Definition at line 2360 of file Shapes.cpp.

{
    return _name;
}

References _name.

Field Documentation

_name

const std::string LibBoard::QuadraticBezierCurve::_name

staticprivate

name of the shape.

Definition at line 1215 of file Board/Shapes.h.

Referenced by name().

---

The documentation for this struct was generated from the following files:

• Board/Shapes.h
• Shapes.cpp