Add functions to resolve an arbitrary point to the nearest point on a track

[r2c2.git] / source / libr2c2 / track.cpp

diff --git a/source/libr2c2/track.cpp b/source/libr2c2/track.cpp
index f21aac4d05a438ed6e2dde5b454b548e8e2d86c5..540c24743d05136f121816cba463a92c8f395c7f 100644 (file)
--- a/source/libr2c2/track.cpp
+++ b/source/libr2c2/track.cpp
@@ -326,6 +326,19 @@ TrackPoint Track::get_point(unsigned epi, float d) const
        return get_point(epi, active_path, d);
 }
 
+TrackPoint Track::get_nearest_point(const Vector &p) const
+{
+       Vector local(p.x-pos.x, p.y-pos.y, p.z-pos.z);
+       float c = cos(rot);
+       float s = sin(rot);
+       local = Vector(c*local.x+s*local.y, c*local.y-s*local.x, local.z);
+
+       TrackPoint tp = type.get_nearest_point(local);
+       tp.pos = Vector(pos.x+tp.pos.x*c-tp.pos.y*s, pos.y+tp.pos.y*c+tp.pos.x*s, pos.z+tp.pos.z);
+       tp.dir += rot;
+       return tp;
+}
+
 bool Track::collide_ray(const Vector &start, const Vector &ray)
 {
        Vector local_start(start.x-pos.x, start.y-pos.y, start.z-pos.z);