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path-description.h

#ifndef SEEN_INKSCAPE_LIVAROT_PATH_DESCRIPTION_H
#define SEEN_INKSCAPE_LIVAROT_PATH_DESCRIPTION_H

#include "svg/stringstream.h"
#include "libnr/nr-point.h"

// path description commands
/* FIXME: these should be unnecessary once the refactoring of the path
** description stuff is finished.
*/
enum
{
  descr_moveto = 0,         // a moveto
  descr_lineto = 1,         // a (guess what) lineto
  descr_cubicto = 2,
  descr_bezierto = 3,       // "beginning" of a quadratic bezier spline, will contain its endpoint (i know, it's bad...)
  descr_arcto = 4,
  descr_close = 5,
  descr_interm_bezier = 6,  // control point of the bezier spline
  descr_forced = 7,

  descr_type_mask = 15      // the command no will be stored in a "flags" field, potentially with other info, so we need 
                            // a mask to AND the field and extract the command
};

struct PathDescr
{
  PathDescr() : flags(0), associated(-1), tSt(0), tEn(1) {}
  PathDescr(int f) : flags(f), associated(-1), tSt(0), tEn(1) {}
  virtual ~PathDescr() {}

  int getType() const { return flags & descr_type_mask; }
  void setType(int t) {
    flags &= ~descr_type_mask;
    flags |= t;
  }
  
  virtual void dumpSVG(Inkscape::SVGOStringStream &s, NR::Point const &last) const {}
  virtual PathDescr *clone() const = 0;
  virtual void transform(NR::Matrix const &t) {}
  virtual void dump(std::ostream &s) const {}
  
  int    flags;         // most notably contains the path command no
  int    associated;          // index in the polyline of the point that ends the path portion of this command
  double tSt;
  double tEn;
};

struct PathDescrMoveTo : public PathDescr
{
  PathDescrMoveTo(NR::Point const &pp)
      : PathDescr(descr_moveto), p(pp) {}
  
  void dumpSVG(Inkscape::SVGOStringStream &s, NR::Point const &last) const;
  PathDescr *clone() const;
  void transform(NR::Matrix const &t);
  void dump(std::ostream &s) const;

  NR::Point p;
};

struct PathDescrLineTo : public PathDescr
{
  PathDescrLineTo(NR::Point const &pp)
    : PathDescr(descr_lineto), p(pp) {}
  
  void dumpSVG(Inkscape::SVGOStringStream &s, NR::Point const &last) const;
  PathDescr *clone() const;
  void transform(NR::Matrix const &t);
  void dump(std::ostream &s) const;
  
  NR::Point p;
};

// quadratic bezier curves: a set of control points, and an endpoint
struct PathDescrBezierTo : public PathDescr
{
  PathDescrBezierTo(NR::Point const &pp, int n)
    : PathDescr(descr_bezierto), p(pp), nb(n) {}
  
  PathDescr *clone() const;
  void transform(NR::Matrix const &t);
  void dump(std::ostream &s) const;
  
  NR::Point p;          // the endpoint's coordinates
  int nb;             // number of control points, stored in the next path description commands
};

/* FIXME: I don't think this should be necessary */
struct PathDescrIntermBezierTo : public PathDescr
{
  PathDescrIntermBezierTo()
    : PathDescr(descr_interm_bezier) , p(0, 0) {}
  PathDescrIntermBezierTo(NR::Point const &pp)
    : PathDescr(descr_interm_bezier), p(pp) {}

  PathDescr *clone() const;
  void transform(NR::Matrix const &t);
  void dump(std::ostream &s) const;
  
  NR::Point p;                // control point coordinates
};

// cubic spline curve: 2 tangents and one endpoint
struct PathDescrCubicTo : public PathDescr
{
  PathDescrCubicTo(NR::Point const &pp, NR::Point const &s, NR::Point const& e)
    : PathDescr(descr_cubicto), p(pp), start(s), end(e) {}
  
  void dumpSVG(Inkscape::SVGOStringStream &s, NR::Point const &last) const;
  PathDescr *clone() const;
  void transform(NR::Matrix const &t);
  void dump(std::ostream &s) const;
  
  NR::Point p;
  NR::Point start;
  NR::Point end;
};

// arc: endpoint, 2 radii and one angle, plus 2 booleans to choose the arc (svg style)
struct PathDescrArcTo : public PathDescr
{
  PathDescrArcTo(NR::Point const &pp, double x, double y, double a, bool l, bool c)
    : PathDescr(descr_arcto), p(pp), rx(x), ry(y), angle(a), large(l), clockwise(c) {}
  
  void dumpSVG(Inkscape::SVGOStringStream &s, NR::Point const &last) const;
  PathDescr *clone() const;
  void transform(NR::Matrix const &t);
  void dump(std::ostream &s) const;
  
  NR::Point p;
  double rx;
  double ry;
  double angle;
  bool large;
  bool clockwise;
};

struct PathDescrForced : public PathDescr
{
  PathDescrForced() : PathDescr(descr_forced), p(0, 0) {}
  
  PathDescr *clone() const;
  
  /* FIXME: not sure whether _forced should have a point associated with it;
  ** Path::ConvertForcedToMoveTo suggests that maybe it should.
  */
  NR::Point p;
};

struct PathDescrClose : public PathDescr
{
  PathDescrClose() : PathDescr(descr_close) {}
  
  void dumpSVG(Inkscape::SVGOStringStream &s, NR::Point const &last) const;
  PathDescr *clone() const;
  
  /* FIXME: not sure whether _forced should have a point associated with it;
  ** Path::ConvertForcedToMoveTo suggests that maybe it should.
  */
  NR::Point p;
};

#endif


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