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"
20 #include <glibmm/ustring.h>
22 #include <list>
24 class SPDesktop;
25 class SPPath;
26 class SPKnot;
28 namespace Inkscape {
29 namespace XML {
30 class Node;
31 }
32 }
35 /**
36 * Radial objects are represented by an angle and a distance from
37 * 0,0. 0,0 is represented by a == big_num.
38 */
39 class Radial{
40 public:
41 /** Radius */
42 double r;
43 /** Amplitude */
44 double a;
45 Radial() {}
46 // Radial(NR::Point const &p); // Convert a point to radial coordinates
47 Radial(Radial &p) : r(p.r),a(p.a) {}
48 // operator NR::Point() const;
50 /**
51 * Construct Radial from NR::Point.
52 */
53 Radial(NR::Point const &p)
54 {
55 r = NR::L2(p);
56 if (r > 0) {
57 a = NR::atan2 (p);
58 } else {
59 a = HUGE_VAL; //undefined
60 }
61 }
63 /**
64 * Cast Radial to cartesian NR::Point.
65 */
66 operator NR::Point() const
67 {
68 if (a == HUGE_VAL) {
69 return NR::Point(0,0);
70 } else {
71 return r*NR::Point(cos(a), sin(a));
72 }
73 }
75 };
77 class ShapeEditor;
79 namespace Inkscape {
80 namespace NodePath {
82 /**
83 * This is a node on a subpath
84 */
85 class Path;
87 /**
88 * This is a subdivision of a NodePath
89 */
90 class SubPath;
92 class NodeSide;
94 /**
95 * This is a node (point) along a subpath
96 */
97 class Node;
99 /**
100 * This is a collection of subpaths which contain nodes
101 *
102 * In the following data model. Nodepaths are made up of subpaths which
103 * are comprised of nodes.
104 *
105 * Nodes are linked thus:
106 * \verbatim
107 n other
108 node -----> nodeside ------> node \endverbatim
109 */
110 class Path {
111 public:
112 /** Pointer to the current desktop, for reporting purposes */
113 SPDesktop * desktop;
114 /** The parent path of this nodepath */
115 SPObject * object;
116 /** The context which created this nodepath. Important if this nodepath is deleted */
117 ShapeEditor *shape_editor;
118 /** The subpaths which comprise this NodePath */
119 GList * subpaths;
120 /** A list of nodes which are currently selected */
121 GList * selected;
122 /** Transforms (userspace <---> virtual space? someone please describe )
123 njh: I'd be guessing that these are item <-> desktop transforms.*/
124 NR::Matrix i2d, d2i;
125 /** The DOM node which describes this NodePath */
126 Inkscape::XML::Node *repr;
127 gchar *repr_key;
128 gchar *repr_nodetypes_key;
129 //STL compliant method to get the selected nodes
130 void selection(std::list<Node *> &l);
132 /// livarot library is used for "point on path" and "nearest position on path", so we need to maintain its path representation as well
133 ::Path *livarot_path;
135 /// draw a "sketch" of the path by using these variables
136 SPCanvasItem *helper_path;
137 SPCurve *curve;
138 bool show_helperpath;
140 /// true if we changed repr, to tell this change from an external one such as from undo, simplify, or another desktop
141 unsigned int local_change;
143 /// true if we're showing selected nodes' handles
144 bool show_handles;
146 /// true if the path cannot contain curves, just straight lines
147 bool straight_path;
149 /// active_node points to the node that is currently mouseovered (= NULL if
150 /// there isn't any); we also consider the node mouseovered if it is covered
151 /// by one of its handles and the latter is mouseovered
152 static Node *active_node;
153 };
156 /**
157 * This is the lowest list item, a simple list of nodes.
158 */
159 class SubPath {
160 public:
161 /** The parent of this subpath */
162 Path * nodepath;
163 /** Is this path closed (no endpoints) or not?*/
164 gboolean closed;
165 /** The nodes in this subpath. */
166 GList * nodes;
167 /** The first node of the subpath (does not imply open/closed)*/
168 Node * first;
169 /** The last node of the subpath */
170 Node * last;
171 };
175 /**
176 * What kind of node is this? This is the value for the node->type
177 * field. NodeType indicates the degree of continuity required for
178 * the node. I think that the corresponding integer indicates which
179 * derivate is connected. (Thus 2 means that the node is continuous
180 * to the second derivative, i.e. has matching endpoints and tangents)
181 */
182 typedef enum {
183 /** A normal node */
184 NODE_NONE,
185 /** This node non-continuously joins two segments.*/
186 NODE_CUSP,
187 /** This node continuously joins two segments. */
188 NODE_SMOOTH,
189 /** This node is symmetric. */
190 NODE_SYMM
191 } NodeType;
195 /**
196 * A NodeSide is a datarecord which may be on either side (n or p) of a node,
197 * which describes the segment going to the next node.
198 */
199 class NodeSide{
200 public:
201 /** Pointer to the next node, */
202 Node * other;
203 /** Position */
204 NR::Point pos;
205 /** Origin (while dragging) in radial notation */
206 Radial origin_radial;
207 /** Origin (while dragging) in x/y notation */
208 NR::Point origin;
209 /** Knots are Inkscape's way of providing draggable points. This
210 * Knot is the point on the curve representing the control point in a
211 * bezier curve.*/
212 SPKnot * knot;
213 /** What kind of rendering? */
214 SPCanvasItem * line;
215 };
217 /**
218 * A node along a NodePath
219 */
220 class Node {
221 public:
222 /** The parent subpath of this node */
223 SubPath * subpath;
224 /** Type is selected from NodeType.*/
225 guint type : 4;
226 /** Code refers to which ArtCode is used to represent the segment
227 * (which segment?).*/
228 guint code : 4;
229 /** Boolean. Am I currently selected or not? */
230 guint selected : 1;
231 /** */
232 NR::Point pos;
233 /** */
234 NR::Point origin;
235 /** Knots are Inkscape's way of providing draggable points. This
236 * Knot is the point on the curve representing the endpoint.*/
237 SPKnot * knot;
238 /** The NodeSide in the 'next' direction */
239 NodeSide n;
240 /** The NodeSide in the 'previous' direction */
241 NodeSide p;
243 /** The pointer to the nodeside which we are dragging out with Shift */
244 NodeSide *dragging_out;
246 /** Boolean. Am I being dragged? */
247 guint is_dragging : 1;
248 };
250 } // namespace NodePath
251 } // namespace Inkscape
253 enum {
254 SCULPT_PROFILE_LINEAR,
255 SCULPT_PROFILE_BELL,
256 SCULPT_PROFILE_ELLIPTIC
257 };
259 // Do function documentation in nodepath.cpp
260 Inkscape::NodePath::Path * sp_nodepath_new (SPDesktop * desktop, SPObject *object, bool show_handles, const char * repr_key = NULL);
261 void sp_nodepath_destroy (Inkscape::NodePath::Path * nodepath);
262 void sp_nodepath_ensure_livarot_path(Inkscape::NodePath::Path *np);
263 void sp_nodepath_deselect (Inkscape::NodePath::Path *nodepath);
264 void sp_nodepath_select_all (Inkscape::NodePath::Path *nodepath, bool invert);
265 void sp_nodepath_select_all_from_subpath(Inkscape::NodePath::Path *nodepath, bool invert);
266 void sp_nodepath_select_next (Inkscape::NodePath::Path *nodepath);
267 void sp_nodepath_select_prev (Inkscape::NodePath::Path *nodepath);
268 void sp_nodepath_select_rect (Inkscape::NodePath::Path * nodepath, NR::Rect const &b, gboolean incremental);
269 GList *save_nodepath_selection (Inkscape::NodePath::Path *nodepath);
270 void restore_nodepath_selection (Inkscape::NodePath::Path *nodepath, GList *r);
271 gboolean nodepath_repr_d_changed (Inkscape::NodePath::Path * np, const char *newd);
272 gboolean nodepath_repr_typestr_changed (Inkscape::NodePath::Path * np, const char *newtypestr);
273 gboolean node_key (GdkEvent * event);
274 void sp_nodepath_update_repr(Inkscape::NodePath::Path *np, const gchar *annotation);
275 void sp_nodepath_update_statusbar (Inkscape::NodePath::Path *nodepath);
276 void sp_nodepath_selected_align(Inkscape::NodePath::Path *nodepath, NR::Dim2 axis);
277 void sp_nodepath_selected_distribute(Inkscape::NodePath::Path *nodepath, NR::Dim2 axis);
278 void sp_nodepath_select_segment_near_point(Inkscape::NodePath::Path *nodepath, NR::Point p, bool toggle);
279 void sp_nodepath_add_node_near_point(Inkscape::NodePath::Path *nodepath, NR::Point p);
280 void sp_nodepath_curve_drag(int node, double t, NR::Point delta);
281 Inkscape::NodePath::Node * sp_nodepath_get_node_by_index(int index);
282 /* possibly private functions */
284 void sp_node_selected_add_node (Inkscape::NodePath::Path *nodepath);
285 void sp_node_selected_break (Inkscape::NodePath::Path *nodepath);
286 void sp_node_selected_duplicate (Inkscape::NodePath::Path *nodepath);
287 void sp_node_selected_join (Inkscape::NodePath::Path *nodepath);
288 void sp_node_selected_join_segment (Inkscape::NodePath::Path *nodepath);
289 void sp_node_delete_preserve (GList *nodes_to_delete);
290 void sp_node_selected_delete (Inkscape::NodePath::Path *nodepath);
291 void sp_node_selected_delete_segment (Inkscape::NodePath::Path *nodepath);
292 void sp_node_selected_set_type (Inkscape::NodePath::Path *nodepath, Inkscape::NodePath::NodeType type);
293 void sp_node_selected_set_line_type (Inkscape::NodePath::Path *nodepath, NRPathcode code);
294 void sp_node_selected_move (Inkscape::NodePath::Path *nodepath, gdouble dx, gdouble dy);
295 void sp_node_selected_move_screen (Inkscape::NodePath::Path *nodepath, gdouble dx, gdouble dy);
297 void sp_nodepath_show_handles(Inkscape::NodePath::Path *nodepath, bool show);
299 void sp_nodepath_selected_nodes_rotate (Inkscape::NodePath::Path * nodepath, gdouble angle, int which, bool screen);
301 void sp_nodepath_selected_nodes_scale (Inkscape::NodePath::Path * nodepath, gdouble grow, int which);
302 void sp_nodepath_selected_nodes_scale_screen (Inkscape::NodePath::Path * nodepath, gdouble grow, int which);
304 void sp_nodepath_flip (Inkscape::NodePath::Path *nodepath, NR::Dim2 axis, NR::Maybe<NR::Point> center);
306 #endif