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 "axis-manip.h"
18 #include "line-geometry.h" // TODO: Remove this include as soon as we don't need create_canvas_(point|line) any more.
20 namespace Box3D {
22 enum VPState {
23 VP_FINITE = 0, // perspective lines meet in the VP
24 VP_INFINITE // perspective lines are parallel
25 };
27 // FIXME: Store the Axis of the VP inside the class
28 class VanishingPoint : public NR::Point {
29 public:
30 inline VanishingPoint() : NR::Point() {};
31 /***
32 inline VanishingPoint(NR::Point const &pt, NR::Point const &ref = NR::Point(0,0))
33 : NR::Point (pt),
34 ref_pt (ref),
35 v_dir (pt[NR::X] - ref[NR::X], pt[NR::Y] - ref[NR::Y]) {}
36 inline VanishingPoint(NR::Coord x, NR::Coord y, NR::Point const &ref = NR::Point(0,0))
37 : NR::Point (x, y),
38 ref_pt (ref),
39 v_dir (x - ref[NR::X], y - ref[NR::Y]) {}
40 ***/
41 VanishingPoint(NR::Point const &pt, NR::Point const &inf_dir, VPState st);
42 VanishingPoint(NR::Point const &pt);
43 VanishingPoint(NR::Point const &dir, VPState const state);
44 VanishingPoint(NR::Point const &pt, NR::Point const &direction);
45 VanishingPoint(NR::Coord x, NR::Coord y);
46 VanishingPoint(NR::Coord x, NR::Coord y, VPState const state);
47 VanishingPoint(NR::Coord x, NR::Coord y, NR::Coord dir_x, NR::Coord dir_y);
48 VanishingPoint(VanishingPoint const &rhs);
50 bool is_finite();
51 VPState toggle_parallel();
52 void draw(Box3D::Axis const axis); // Draws a point on the canvas if state == VP_FINITE
53 //inline VPState state() { return state; }
55 VPState state;
56 //NR::Point ref_pt; // point of reference to compute the direction of parallel lines
57 NR::Point v_dir; // direction of perslective lines if the VP has state == VP_INFINITE
59 private:
60 };
63 } // namespace Box3D
66 /** A function to print out the VanishingPoint (prints the coordinates) **/
67 /***
68 inline std::ostream &operator<< (std::ostream &out_file, const VanishingPoint &vp) {
69 out_file << vp;
70 return out_file;
71 }
72 ***/
75 #endif /* !SEEN_VANISHING_POINT_H */
77 /*
78 Local Variables:
79 mode:c++
80 c-file-style:"stroustrup"
81 c-file-offsets:((innamespace . 0)(inline-open . 0))
82 indent-tabs-mode:nil
83 fill-column:99
84 End:
85 */
86 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4 :