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/*
* Vanishing point for 3D perspectives
*
* Authors:
* Maximilian Albert <Anhalter42@gmx.de>
*
* Copyright (C) 2007 authors
*
* Released under GNU GPL, read the file 'COPYING' for more information
*/
#ifndef SEEN_VANISHING_POINT_H
#define SEEN_VANISHING_POINT_H
#include "libnr/nr-point.h"
#include "line-geometry.h"
namespace Box3D {
enum VPState {
VP_FINITE = 0, // perspective lines meet in the VP
VP_INFINITE // perspective lines are parallel
};
// The X-/Y-/Z-axis corresponds to the first/second/third digit
// in binary representation, respectively.
enum Axis {
X = 1,
Y = 2,
Z = 4,
NONE = 0
};
/** Given two axis directions out of {X, Y, Z}, returns the remaining one */
inline Box3D::Axis third_axis_direction (Box3D::Axis dir1, Box3D::Axis dir2) {
return (Box3D::Axis) ((dir1 + dir2) ^ 0x7);
}
// FIXME: Store the Axis of the VP inside the class
class VanishingPoint : public NR::Point {
public:
inline VanishingPoint() : NR::Point() {};
/***
inline VanishingPoint(NR::Point const &pt, NR::Point const &ref = NR::Point(0,0))
: NR::Point (pt),
ref_pt (ref),
v_dir (pt[NR::X] - ref[NR::X], pt[NR::Y] - ref[NR::Y]) {}
inline VanishingPoint(NR::Coord x, NR::Coord y, NR::Point const &ref = NR::Point(0,0))
: NR::Point (x, y),
ref_pt (ref),
v_dir (x - ref[NR::X], y - ref[NR::Y]) {}
***/
VanishingPoint(NR::Point const &pt, NR::Point const &inf_dir, VPState st);
VanishingPoint(NR::Point const &pt);
VanishingPoint(NR::Point const &dir, VPState const state);
VanishingPoint(NR::Point const &pt, NR::Point const &direction);
VanishingPoint(NR::Coord x, NR::Coord y);
VanishingPoint(NR::Coord x, NR::Coord y, VPState const state);
VanishingPoint(NR::Coord x, NR::Coord y, NR::Coord dir_x, NR::Coord dir_y);
VanishingPoint(VanishingPoint const &rhs);
bool is_finite();
VPState toggle_parallel();
void draw(Box3D::Axis const axis); // Draws a point on the canvas if state == VP_FINITE
//inline VPState state() { return state; }
VPState state;
//NR::Point ref_pt; // point of reference to compute the direction of parallel lines
NR::Point v_dir; // direction of perslective lines if the VP has state == VP_INFINITE
private:
};
} // namespace Box3D
/** A function to print out the VanishingPoint (prints the coordinates) **/
/***
inline std::ostream &operator<< (std::ostream &out_file, const VanishingPoint &vp) {
out_file << vp;
return out_file;
}
***/
#endif /* !SEEN_VANISHING_POINT_H */
/*
Local Variables:
mode:c++
c-file-style:"stroustrup"
c-file-offsets:((innamespace . 0)(inline-open . 0))
indent-tabs-mode:nil
fill-column:99
End:
*/
// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4 :
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