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 "libnr/nr-point.h"
16 #include "line-geometry.h"
18 namespace Box3D {
20 enum VPState {
21 VP_FINITE = 0, // perspective lines meet in the VP
22 VP_INFINITE // perspective lines are parallel
23 };
25 enum PerspDir {
26 X,
27 Y,
28 Z,
29 NONE
30 };
32 // FIXME: Store the PerspDir of the VP inside the class
33 class VanishingPoint : public NR::Point {
34 public:
35 inline VanishingPoint() : NR::Point() {};
36 /***
37 inline VanishingPoint(NR::Point const &pt, NR::Point const &ref = NR::Point(0,0))
38 : NR::Point (pt),
39 ref_pt (ref),
40 v_dir (pt[NR::X] - ref[NR::X], pt[NR::Y] - ref[NR::Y]) {}
41 inline VanishingPoint(NR::Coord x, NR::Coord y, NR::Point const &ref = NR::Point(0,0))
42 : NR::Point (x, y),
43 ref_pt (ref),
44 v_dir (x - ref[NR::X], y - ref[NR::Y]) {}
45 ***/
46 VanishingPoint(NR::Point const &pt, NR::Point const &inf_dir, VPState st);
47 VanishingPoint(NR::Point const &pt);
48 VanishingPoint(NR::Point const &dir, VPState const state);
49 VanishingPoint(NR::Point const &pt, NR::Point const &direction);
50 VanishingPoint(NR::Coord x, NR::Coord y);
51 VanishingPoint(NR::Coord x, NR::Coord y, VPState const state);
52 VanishingPoint(NR::Coord x, NR::Coord y, NR::Coord dir_x, NR::Coord dir_y);
53 VanishingPoint(VanishingPoint const &rhs);
55 bool is_finite();
56 VPState toggle_parallel();
57 void draw(PerspDir const axis); // Draws a point on the canvas if state == VP_FINITE
58 //inline VPState state() { return state; }
60 VPState state;
61 //NR::Point ref_pt; // point of reference to compute the direction of parallel lines
62 NR::Point v_dir; // direction of perslective lines if the VP has state == VP_INFINITE
64 private:
65 };
68 } // namespace Box3D
71 /** A function to print out the VanishingPoint (prints the coordinates) **/
72 /***
73 inline std::ostream &operator<< (std::ostream &out_file, const VanishingPoint &vp) {
74 out_file << vp;
75 return out_file;
76 }
77 ***/
80 #endif /* !SEEN_VANISHING_POINT_H */
82 /*
83 Local Variables:
84 mode:c++
85 c-file-style:"stroustrup"
86 c-file-offsets:((innamespace . 0)(inline-open . 0))
87 indent-tabs-mode:nil
88 fill-column:99
89 End:
90 */
91 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4 :