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#define __PERSPECTIVE3D_C__
/*
* Class modelling a 3D perspective
*
* Authors:
* Maximilian Albert <Anhalter42@gmx.de>
*
* Copyright (C) 2007 authors
*
* Released under GNU GPL, read the file 'COPYING' for more information
*/
#include "box3d-context.h"
#include "perspective-line.h"
#include <iostream>
namespace Box3D {
/**
* Computes the intersection of the two perspective lines from pt1 and pt2 to the respective
* vanishing points in the given directions.
*/
// FIXME: This has been moved to a virtual method inside PerspectiveLine; can probably be purged
NR::Point perspective_intersection (NR::Point pt1, Box3D::Axis dir1, NR::Point pt2, Box3D::Axis dir2)
{
VanishingPoint const *vp1 = SP3DBoxContext::current_perspective->get_vanishing_point(dir1);
VanishingPoint const *vp2 = SP3DBoxContext::current_perspective->get_vanishing_point(dir2);
NR::Maybe<NR::Point> meet = Line(pt1, *vp1).intersect(Line(pt2, *vp2));
// FIXME: How to handle parallel lines (also depends on the type of the VPs)?
if (!meet) { meet = NR::Point (0.0, 0.0); }
return *meet;
}
/**
* Find the point on the perspective line from line_pt to the
* vanishing point in direction dir that is closest to ext_pt.
*/
NR::Point perspective_line_snap (NR::Point line_pt, Box3D::Axis dir, NR::Point ext_pt)
{
return PerspectiveLine(line_pt, dir).closest_to(ext_pt);
}
Perspective3D::Perspective3D (VanishingPoint const &pt_x, VanishingPoint const &pt_y, VanishingPoint const &pt_z)
: vp_x (pt_x),
vp_y (pt_y),
vp_z (pt_z)
{
// Draw the three vanishing points
vp_x.draw(X);
vp_y.draw(Y);
vp_z.draw(Z);
}
VanishingPoint *Perspective3D::get_vanishing_point (Box3D::Axis const dir)
{
// FIXME: Also handle value 'NONE' in switch
switch (dir) {
case X:
return &vp_x;
break;
case Y:
return &vp_y;
break;
case Z:
return &vp_z;
break;
}
}
void Perspective3D::set_vanishing_point (Box3D::Axis const dir, VanishingPoint const &pt)
{
switch (dir) {
case X:
vp_x = pt;
break;
case Y:
vp_y = pt;
break;
case Z:
vp_z = pt;
break;
case NONE:
// no vanishing point to set
break;
}
}
} // namespace Box3D
/*
Local Variables:
mode:c++
c-file-style:"stroustrup"
c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
indent-tabs-mode:nil
fill-column:99
End:
*/
// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :
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