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nodepath.h

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#ifndef __SP_NODEPATH_H__
#define __SP_NODEPATH_H__

/** \file
 * Path handler in node edit mode
 */

/*
 * Authors:
 *   Lauris Kaplinski <lauris@kaplinski.com>
 *
 * This code is in public domain
 */

//#include "knot.h"
//#include "sp-path.h"
//#include "desktop-handles.h"
#include "libnr/nr-path-code.h"

#include <list>

class SPDesktop;
class SPPath;
class SPKnot;

namespace Inkscape {
namespace XML {
class Node;
}
}


/** 
 * Radial objects are represented by an angle and a distance from
 * 0,0.  0,0 is represented by a == big_num.
 */
00037 class Radial{
 public:
/**  Radius */
00040       double r;
/**  Amplitude */
00042       double a;
      Radial() {}
      //    Radial(NR::Point const &p); // Convert a point to radial coordinates
      Radial(Radial &p) : r(p.r),a(p.a) {}
      //    operator NR::Point() const;

/**
 * Construct Radial from NR::Point.
 */
00051 Radial(NR::Point const &p)
{
      r = NR::L2(p);
      if (r > 0) {
            a = NR::atan2 (p);
      } else {
            a = HUGE_VAL; //undefined
      }
}

/**
 * Cast Radial to cartesian NR::Point.
 */
00064 operator NR::Point() const
{
      if (a == HUGE_VAL) {
            return NR::Point(0,0);
      } else {
            return r*NR::Point(cos(a), sin(a));
      }
}

};

/** defined in node-context.h */
class SPNodeContext;

namespace Inkscape {
namespace NodePath {

/**
 * This is a node on a subpath
 */
class Path;

/**
 * This is a subdivision of a NodePath
 */
class SubPath;

class NodeSide;

/**
 * This is a node (point) along a subpath
 */
class Node;


/**
 *  This is a collection of subpaths which contain nodes
 *
 * In the following data model.   Nodepaths are made up of subpaths which
 * are comprised of nodes.
 *
 * Nodes are linked thus:
 * \verbatim
           n              other
    node -----> nodeside ------> node            \endverbatim
 */
00110 class Path {
 public:
/**  Pointer to the current desktop, for reporting purposes */
00113       SPDesktop * desktop;
/**  The parent path of this nodepath */
00115       SPPath * path;
/**  The context which created this nodepath.  Important if this nodepath is deleted */
00117       SPNodeContext * nodeContext;
/**  The subpaths which comprise this NodePath */
00119       GList * subpaths;
/**  A list of nodes which are currently selected */
00121       GList * selected;
/**  Transforms (userspace <---> virtual space?   someone please describe )
       njh: I'd be guessing that these are item <-> desktop transforms.*/
00124       NR::Matrix i2d, d2i;
/**  The DOM node which describes this NodePath */
00126       Inkscape::XML::Node *repr;
      //STL compliant method to get the selected nodes
      void selection(std::list<Node *> &l);
};


/**
 *  This is the lowest list item, a simple list of nodes.
 */
00135 class SubPath {
 public:
/**  The parent of this subpath */
00138       Path * nodepath;
/**  Is this path closed (no endpoints) or not?*/
00140       gboolean closed;
/**  The nodes in this subpath. */
00142       GList * nodes;
/**  The first node of the subpath (does not imply open/closed)*/
00144       Node * first;
/**  The last node of the subpath */
00146       Node * last;
};



/**
 *  What kind of node is this?  This is the value for the node->type
 *  field.  NodeType indicates the degree of continuity required for
 *  the node.  I think that the corresponding integer indicates which
 *  derivate is connected. (Thus 2 means that the node is continuous
 *  to the second derivative, i.e. has matching endpoints and tangents)
 */
typedef enum {
/**  A normal node */
      NODE_NONE,
/**  This node non-continuously joins two segments.*/
      NODE_CUSP,
/**  This node continuously joins two segments. */
      NODE_SMOOTH,
/**  This node is symmetric. */
      NODE_SYMM
} NodeType;



/**
 * A NodeSide is a datarecord which may be on either side (n or p) of a node,
 * which describes the segment going to the next node.
 */
00175 class NodeSide{
 public:
/**  Pointer to the next node, */
00178       Node * other;
/**  Position */
00180       NR::Point pos;
/**  Knots are Inkscape's way of providing draggable points.  This
 *  Knot is the point on the curve representing the control point in a
 *  bezier curve.*/
00184       SPKnot * knot;
/**  What kind of rendering? */
00186       SPCanvasItem * line;
/**  */
00188       Radial origin;
};

/**
 * A node along a NodePath
 */
00194 class Node {
 public:
/**  The parent subpath of this node */
00197       SubPath * subpath;
/**  Type is selected from NodeType.*/
00199       guint type : 4;
/**  Code refers to which ArtCode is used to represent the segment
 *  (which segment?).*/
00202       guint code : 4;
/**  Boolean.  Am I currently selected or not? */
00204       guint selected : 1;
/**  */
00206       NR::Point pos;
/**  */
00208       NR::Point origin;
/**  Knots are Inkscape's way of providing draggable points.  This
 *  Knot is the point on the curve representing the endpoint.*/
00211       SPKnot * knot;
/**  The NodeSide in the 'next' direction */
00213       NodeSide n;
/**  The NodeSide in the 'previous' direction */
00215       NodeSide p;

      /** The pointer to the nodeside which we are dragging out with Shift */
00218       NodeSide *dragging_out;
};

}  // namespace NodePath
}  // namespace Inkscape

// Do function documentation in nodepath.cpp
Inkscape::NodePath::Path * sp_nodepath_new (SPDesktop * desktop, SPItem * item);
void sp_nodepath_destroy (Inkscape::NodePath::Path * nodepath);
void sp_nodepath_deselect (Inkscape::NodePath::Path *nodepath);
void sp_nodepath_select_all (Inkscape::NodePath::Path *nodepath);
void sp_nodepath_select_all_from_subpath(Inkscape::NodePath::Path *nodepath);
void sp_nodepath_select_next (Inkscape::NodePath::Path *nodepath);
void sp_nodepath_select_prev (Inkscape::NodePath::Path *nodepath);
void sp_nodepath_select_rect (Inkscape::NodePath::Path * nodepath, NRRect * b, gboolean incremental);
GList *save_nodepath_selection (Inkscape::NodePath::Path *nodepath);
void restore_nodepath_selection (Inkscape::NodePath::Path *nodepath, GList *r);
gboolean nodepath_repr_d_changed (Inkscape::NodePath::Path * np, const char *newd);
gboolean nodepath_repr_typestr_changed (Inkscape::NodePath::Path * np, const char *newtypestr);
gboolean node_key (GdkEvent * event);
void sp_nodepath_update_statusbar (Inkscape::NodePath::Path *nodepath);
void sp_nodepath_selected_align(Inkscape::NodePath::Path *nodepath, NR::Dim2 axis);
void sp_nodepath_selected_distribute(Inkscape::NodePath::Path *nodepath, NR::Dim2 axis);
void sp_nodepath_select_segment_near_point(SPItem * item, NR::Point p, bool toggle);
void sp_nodepath_add_node_near_point(SPItem * item, NR::Point p);
void sp_nodepath_curve_drag(Inkscape::NodePath::Node * e, double t, NR::Point delta, char * key);
Inkscape::NodePath::Node * sp_nodepath_get_node_by_index(int index);
/* possibly private functions */

void sp_node_selected_add_node (void);
void sp_node_selected_break (void);
void sp_node_selected_duplicate (void);
void sp_node_selected_join (void);
void sp_node_selected_join_segment (void);
void sp_node_selected_delete (void);
void sp_node_selected_delete_segment (void);
void sp_node_selected_set_type (Inkscape::NodePath::NodeType type);
void sp_node_selected_set_line_type (NRPathcode code);
void sp_node_selected_move (gdouble dx, gdouble dy);
void sp_node_selected_move_screen (gdouble dx, gdouble dy);

void sp_nodepath_selected_nodes_rotate (Inkscape::NodePath::Path * nodepath, gdouble angle, int which, bool screen);

void sp_nodepath_selected_nodes_scale (Inkscape::NodePath::Path * nodepath, gdouble grow, int which);
void sp_nodepath_selected_nodes_scale_screen (Inkscape::NodePath::Path * nodepath, gdouble grow, int which);

void sp_nodepath_flip (Inkscape::NodePath::Path *nodepath, NR::Dim2 axis);

#endif

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