1 /*
2 * Vanishing point for 3D perspectives
3 *
4 * Authors:
5 * Maximilian Albert <Anhalter42@gmx.de>
6 *
7 * Copyright (C) 2007 authors
8 *
9 * Released under GNU GPL, read the file 'COPYING' for more information
10 */
12 #ifndef SEEN_VANISHING_POINT_H
13 #define SEEN_VANISHING_POINT_H
15 #include <set>
16 #include <2geom/point.h>
17 #include "knot.h"
18 #include "selection.h"
19 #include "axis-manip.h"
20 #include "inkscape.h"
21 #include "persp3d.h"
22 #include "box3d.h"
23 #include "persp3d-reference.h"
25 class SPBox3D;
27 namespace Box3D {
29 enum VPState {
30 VP_FINITE = 0, // perspective lines meet in the VP
31 VP_INFINITE // perspective lines are parallel
32 };
34 /* VanishingPoint is a simple wrapper class to easily extract VP data from perspectives.
35 * A VanishingPoint represents a VP in a certain direction (X, Y, Z) of a single perspective.
36 * In particular, it can potentially have more than one box linked to it (although in facth they
37 * are rather linked to the parent perspective).
38 */
39 // FIXME: Don't store the box in the VP but rather the perspective (and link the box to it)!!
40 class VanishingPoint {
41 public:
42 VanishingPoint() : my_counter(VanishingPoint::global_counter++), _persp(NULL), _axis(Proj::NONE) {}
43 VanishingPoint(Persp3D *persp, Proj::Axis axis) : my_counter(VanishingPoint::global_counter++), _persp(persp), _axis(axis) {}
44 VanishingPoint(const VanishingPoint &other) : my_counter(VanishingPoint::global_counter++), _persp(other._persp), _axis(other._axis) {}
46 inline VanishingPoint &operator=(VanishingPoint const &rhs) {
47 _persp = rhs._persp;
48 _axis = rhs._axis;
49 return *this;
50 }
51 inline bool operator==(VanishingPoint const &rhs) const {
52 /* vanishing points coincide if they belong to the same perspective */
53 return (_persp == rhs._persp && _axis == rhs._axis);
54 }
56 inline bool operator<(VanishingPoint const &rhs) const {
57 return my_counter < rhs.my_counter;
58 }
60 inline void set(Persp3D *persp, Proj::Axis axis) {
61 _persp = persp;
62 _axis = axis;
63 }
64 void set_pos(Proj::Pt2 const &pt);
65 inline bool is_finite() const {
66 g_return_val_if_fail (_persp, false);
67 return persp3d_get_VP (_persp, _axis).is_finite();
68 }
69 inline Geom::Point get_pos() const {
70 g_return_val_if_fail (_persp, Geom::Point (NR_HUGE, NR_HUGE));
71 return persp3d_get_VP (_persp,_axis).affine();
72 }
73 inline Persp3D * get_perspective() const {
74 return _persp;
75 }
76 inline Persp3D * set_perspective(Persp3D *persp) {
77 return _persp = persp;
78 }
80 inline bool hasBox (SPBox3D *box) {
81 return persp3d_has_box(_persp, box);
82 }
83 inline unsigned int numberOfBoxes() const {
84 return persp3d_num_boxes(_persp);
85 }
87 /* returns all selected boxes sharing this perspective */
88 std::list<SPBox3D *> selectedBoxes(Inkscape::Selection *sel);
90 inline void updateBoxDisplays() const {
91 g_return_if_fail (_persp);
92 persp3d_update_box_displays(_persp);
93 }
94 inline void updateBoxReprs() const {
95 g_return_if_fail (_persp);
96 persp3d_update_box_reprs(_persp);
97 }
98 inline void updatePerspRepr() const {
99 g_return_if_fail (_persp);
100 SP_OBJECT(_persp)->updateRepr(SP_OBJECT_WRITE_EXT);
101 }
102 inline void printPt() const {
103 g_return_if_fail (_persp);
104 persp3d_get_VP (_persp, _axis).print("");
105 }
106 inline gchar const *axisString () { return Proj::string_from_axis(_axis); }
108 unsigned int my_counter;
109 static unsigned int global_counter; // FIXME: Only to implement operator< so that we can merge lists. Do this in a better way!!
110 private:
111 Persp3D *_persp;
112 Proj::Axis _axis;
113 };
115 class VPDrag;
117 struct less_ptr : public std::binary_function<VanishingPoint *, VanishingPoint *, bool> {
118 bool operator()(VanishingPoint *vp1, VanishingPoint *vp2) {
119 return GPOINTER_TO_INT(vp1) < GPOINTER_TO_INT(vp2);
120 }
121 };
123 struct VPDragger {
124 public:
125 VPDragger(VPDrag *parent, Geom::Point p, VanishingPoint &vp);
126 ~VPDragger();
128 VPDrag *parent;
129 SPKnot *knot;
131 // position of the knot, desktop coords
132 Geom::Point point;
133 // position of the knot before it began to drag; updated when released
134 Geom::Point point_original;
136 bool dragging_started;
138 std::list<VanishingPoint> vps;
140 void addVP(VanishingPoint &vp, bool update_pos = false);
141 void removeVP(const VanishingPoint &vp);
143 void updateTip();
145 guint numberOfBoxes(); // the number of boxes linked to all VPs of the dragger
146 VanishingPoint *findVPWithBox(SPBox3D *box);
147 std::set<VanishingPoint*, less_ptr> VPsOfSelectedBoxes();
149 bool hasPerspective(const Persp3D *persp);
150 void mergePerspectives(); // remove duplicate perspectives
152 void updateBoxDisplays();
153 void updateVPs(Geom::Point const &pt);
154 void updateZOrders();
156 void printVPs();
157 };
159 struct VPDrag {
160 public:
161 VPDrag(SPDocument *document);
162 ~VPDrag();
164 VPDragger *getDraggerFor (VanishingPoint const &vp);
166 bool dragging;
168 SPDocument *document;
169 GList *draggers;
170 GSList *lines;
172 void printDraggers(); // convenience for debugging
173 /*
174 * FIXME: Should the following functions be merged?
175 * Also, they should make use of the info in a VanishingPoint structure (regarding boxes
176 * and perspectives) rather than each time iterating over the whole list of selected items?
177 */
178 void updateDraggers ();
179 void updateLines ();
180 void updateBoxHandles ();
181 void updateBoxReprs ();
182 void updateBoxDisplays ();
183 void drawLinesForFace (const SPBox3D *box, Proj::Axis axis); //, guint corner1, guint corner2, guint corner3, guint corner4);
184 bool show_lines; /* whether perspective lines are drawn at all */
185 guint front_or_rear_lines; /* whether we draw perspective lines from all corners or only the
186 front/rear corners (indicated by the first/second bit, respectively */
189 inline bool hasEmptySelection() { return this->selection->isEmpty(); }
190 bool allBoxesAreSelected (VPDragger *dragger);
191 GSList * selectedBoxesWithVPinDragger (VPDragger *dragger);
193 // FIXME: Should this be private? (It's the case with the corresponding function in gradient-drag.h)
194 // But vp_knot_grabbed_handler
195 void addDragger (VanishingPoint &vp);
197 void swap_perspectives_of_VPs(Persp3D *persp2, Persp3D *persp1);
199 private:
200 //void deselect_all();
202 void addLine (Geom::Point p1, Geom::Point p2, guint32 rgba);
204 Inkscape::Selection *selection;
205 sigc::connection sel_changed_connection;
206 sigc::connection sel_modified_connection;
207 };
209 } // namespace Box3D
212 #endif /* !SEEN_VANISHING_POINT_H */
214 /*
215 Local Variables:
216 mode:c++
217 c-file-style:"stroustrup"
218 c-file-offsets:((innamespace . 0)(inline-open . 0))
219 indent-tabs-mode:nil
220 fill-column:99
221 End:
222 */
223 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4 :