1 #ifndef __SP_NODEPATH_H__
2 #define __SP_NODEPATH_H__
4 /** \file
5 * Path handler in node edit mode
6 */
8 /*
9 * Authors:
10 * Lauris Kaplinski <lauris@kaplinski.com>
11 *
12 * This code is in public domain
13 */
15 //#include "knot.h"
16 //#include "sp-path.h"
17 //#include "desktop-handles.h"
18 #include "libnr/nr-path-code.h"
19 #include "livarot/Path.h"
21 #include <list>
23 class SPDesktop;
24 class SPPath;
25 class SPKnot;
27 namespace Inkscape {
28 namespace XML {
29 class Node;
30 }
31 }
34 /**
35 * Radial objects are represented by an angle and a distance from
36 * 0,0. 0,0 is represented by a == big_num.
37 */
38 class Radial{
39 public:
40 /** Radius */
41 double r;
42 /** Amplitude */
43 double a;
44 Radial() {}
45 // Radial(NR::Point const &p); // Convert a point to radial coordinates
46 Radial(Radial &p) : r(p.r),a(p.a) {}
47 // operator NR::Point() const;
49 /**
50 * Construct Radial from NR::Point.
51 */
52 Radial(NR::Point const &p)
53 {
54 r = NR::L2(p);
55 if (r > 0) {
56 a = NR::atan2 (p);
57 } else {
58 a = HUGE_VAL; //undefined
59 }
60 }
62 /**
63 * Cast Radial to cartesian NR::Point.
64 */
65 operator NR::Point() const
66 {
67 if (a == HUGE_VAL) {
68 return NR::Point(0,0);
69 } else {
70 return r*NR::Point(cos(a), sin(a));
71 }
72 }
74 };
76 class ShapeEditor;
78 namespace Inkscape {
79 namespace NodePath {
81 /**
82 * This is a node on a subpath
83 */
84 class Path;
86 /**
87 * This is a subdivision of a NodePath
88 */
89 class SubPath;
91 class NodeSide;
93 /**
94 * This is a node (point) along a subpath
95 */
96 class Node;
98 /**
99 * This is a collection of subpaths which contain nodes
100 *
101 * In the following data model. Nodepaths are made up of subpaths which
102 * are comprised of nodes.
103 *
104 * Nodes are linked thus:
105 * \verbatim
106 n other
107 node -----> nodeside ------> node \endverbatim
108 */
109 class Path {
110 public:
111 /** Pointer to the current desktop, for reporting purposes */
112 SPDesktop * desktop;
113 /** The parent path of this nodepath */
114 SPPath * path;
115 /** The context which created this nodepath. Important if this nodepath is deleted */
116 ShapeEditor *shape_editor;
117 /** The subpaths which comprise this NodePath */
118 GList * subpaths;
119 /** A list of nodes which are currently selected */
120 GList * selected;
121 /** Transforms (userspace <---> virtual space? someone please describe )
122 njh: I'd be guessing that these are item <-> desktop transforms.*/
123 NR::Matrix i2d, d2i;
124 /** The DOM node which describes this NodePath */
125 Inkscape::XML::Node *repr;
126 //STL compliant method to get the selected nodes
127 void selection(std::list<Node *> &l);
129 /// livarot library is used for "point on path" and "nearest position on path", so we need to maintain its path representation as well
130 ::Path *livarot_path;
132 /// true if we changed repr, to tell this change from an external one such as from undo, simplify, or another desktop
133 unsigned int local_change;
135 /// true if we're showing selected nodes' handles
136 bool show_handles;
138 /// active_node points to the node that is currently mouseovered (= NULL if
139 /// there isn't any); we also consider the node mouseovered if it is covered
140 /// by one of its handles and the latter is mouseovered
141 static Node *active_node;
142 };
145 /**
146 * This is the lowest list item, a simple list of nodes.
147 */
148 class SubPath {
149 public:
150 /** The parent of this subpath */
151 Path * nodepath;
152 /** Is this path closed (no endpoints) or not?*/
153 gboolean closed;
154 /** The nodes in this subpath. */
155 GList * nodes;
156 /** The first node of the subpath (does not imply open/closed)*/
157 Node * first;
158 /** The last node of the subpath */
159 Node * last;
160 };
164 /**
165 * What kind of node is this? This is the value for the node->type
166 * field. NodeType indicates the degree of continuity required for
167 * the node. I think that the corresponding integer indicates which
168 * derivate is connected. (Thus 2 means that the node is continuous
169 * to the second derivative, i.e. has matching endpoints and tangents)
170 */
171 typedef enum {
172 /** A normal node */
173 NODE_NONE,
174 /** This node non-continuously joins two segments.*/
175 NODE_CUSP,
176 /** This node continuously joins two segments. */
177 NODE_SMOOTH,
178 /** This node is symmetric. */
179 NODE_SYMM
180 } NodeType;
184 /**
185 * A NodeSide is a datarecord which may be on either side (n or p) of a node,
186 * which describes the segment going to the next node.
187 */
188 class NodeSide{
189 public:
190 /** Pointer to the next node, */
191 Node * other;
192 /** Position */
193 NR::Point pos;
194 /** Origin (while dragging) in radial notation */
195 Radial origin_radial;
196 /** Origin (while dragging) in x/y notation */
197 NR::Point origin;
198 /** Knots are Inkscape's way of providing draggable points. This
199 * Knot is the point on the curve representing the control point in a
200 * bezier curve.*/
201 SPKnot * knot;
202 /** What kind of rendering? */
203 SPCanvasItem * line;
204 };
206 /**
207 * A node along a NodePath
208 */
209 class Node {
210 public:
211 /** The parent subpath of this node */
212 SubPath * subpath;
213 /** Type is selected from NodeType.*/
214 guint type : 4;
215 /** Code refers to which ArtCode is used to represent the segment
216 * (which segment?).*/
217 guint code : 4;
218 /** Boolean. Am I currently selected or not? */
219 guint selected : 1;
220 /** */
221 NR::Point pos;
222 /** */
223 NR::Point origin;
224 /** Knots are Inkscape's way of providing draggable points. This
225 * Knot is the point on the curve representing the endpoint.*/
226 SPKnot * knot;
227 /** The NodeSide in the 'next' direction */
228 NodeSide n;
229 /** The NodeSide in the 'previous' direction */
230 NodeSide p;
232 /** The pointer to the nodeside which we are dragging out with Shift */
233 NodeSide *dragging_out;
235 /** Boolean. Am I being dragged? */
236 guint is_dragging : 1;
237 };
239 } // namespace NodePath
240 } // namespace Inkscape
242 enum {
243 SCULPT_PROFILE_LINEAR,
244 SCULPT_PROFILE_BELL,
245 SCULPT_PROFILE_ELLIPTIC
246 };
248 // Do function documentation in nodepath.cpp
249 Inkscape::NodePath::Path * sp_nodepath_new (SPDesktop * desktop, SPItem * item, bool show_handles);
250 void sp_nodepath_destroy (Inkscape::NodePath::Path * nodepath);
251 void sp_nodepath_ensure_livarot_path(Inkscape::NodePath::Path *np);
252 void sp_nodepath_deselect (Inkscape::NodePath::Path *nodepath);
253 void sp_nodepath_select_all (Inkscape::NodePath::Path *nodepath, bool invert);
254 void sp_nodepath_select_all_from_subpath(Inkscape::NodePath::Path *nodepath, bool invert);
255 void sp_nodepath_select_next (Inkscape::NodePath::Path *nodepath);
256 void sp_nodepath_select_prev (Inkscape::NodePath::Path *nodepath);
257 void sp_nodepath_select_rect (Inkscape::NodePath::Path * nodepath, NR::Rect const &b, gboolean incremental);
258 GList *save_nodepath_selection (Inkscape::NodePath::Path *nodepath);
259 void restore_nodepath_selection (Inkscape::NodePath::Path *nodepath, GList *r);
260 gboolean nodepath_repr_d_changed (Inkscape::NodePath::Path * np, const char *newd);
261 gboolean nodepath_repr_typestr_changed (Inkscape::NodePath::Path * np, const char *newtypestr);
262 gboolean node_key (GdkEvent * event);
263 void sp_nodepath_update_repr(Inkscape::NodePath::Path *np, const gchar *annotation);
264 void sp_nodepath_update_statusbar (Inkscape::NodePath::Path *nodepath);
265 void sp_nodepath_selected_align(Inkscape::NodePath::Path *nodepath, NR::Dim2 axis);
266 void sp_nodepath_selected_distribute(Inkscape::NodePath::Path *nodepath, NR::Dim2 axis);
267 void sp_nodepath_select_segment_near_point(Inkscape::NodePath::Path *nodepath, NR::Point p, bool toggle);
268 void sp_nodepath_add_node_near_point(Inkscape::NodePath::Path *nodepath, NR::Point p);
269 void sp_nodepath_curve_drag(int node, double t, NR::Point delta);
270 Inkscape::NodePath::Node * sp_nodepath_get_node_by_index(int index);
271 /* possibly private functions */
273 void sp_node_selected_add_node (void);
274 void sp_node_selected_break (void);
275 void sp_node_selected_duplicate (void);
276 void sp_node_selected_join (void);
277 void sp_node_selected_join_segment (void);
278 void sp_node_delete_preserve (GList *nodes_to_delete);
279 void sp_node_selected_delete (void);
280 void sp_node_selected_delete_segment (void);
281 void sp_node_selected_set_type (Inkscape::NodePath::NodeType type);
282 void sp_node_selected_set_line_type (NRPathcode code);
283 void sp_node_selected_move (gdouble dx, gdouble dy);
284 void sp_node_selected_move_screen (gdouble dx, gdouble dy);
286 void sp_nodepath_show_handles(bool show);
288 void sp_nodepath_selected_nodes_rotate (Inkscape::NodePath::Path * nodepath, gdouble angle, int which, bool screen);
290 void sp_nodepath_selected_nodes_scale (Inkscape::NodePath::Path * nodepath, gdouble grow, int which);
291 void sp_nodepath_selected_nodes_scale_screen (Inkscape::NodePath::Path * nodepath, gdouble grow, int which);
293 void sp_nodepath_flip (Inkscape::NodePath::Path *nodepath, NR::Dim2 axis, NR::Maybe<NR::Point> center);
295 #endif