C++ CGESTUREptr::straightness方法代码示例

int
INFLATE::stroke_cb(CGESTUREptr& gest, DrawState*& s)
{
   err_adv(debug, "INFLATE::stroke_cb");

   reset_timeout();

   // Verify that we have a starting face
   if ( _orig_face ) {
      Bface* face = 0;

      // Check that the stroke is straight enough to represent a line
      if (!(gest->straightness() > 0.8)) {
         err_adv(debug, "INFLATE::stroke_cb: gesture not straight");
         return false;
      }

      // Check that the gesture starts on the mesh
      Bsurface::hit_ctrl_surface(gest->start(), 1, &face);
      if (!(face)) {
         err_adv(debug, "INFLATE::stroke_cb: can't get hit face");
         return false;
      }

      // create VEXELs for the gesture and the face normal
      VEXEL fvec  = VEXEL(face->v1()->loc(), face->norm());
      VEXEL fgest = gest->endpt_vec();

      // If gesture nearly parallel to normal:
      double a = rad2deg(line_angle(fvec,fgest));
      err_adv(debug, "INFLATE::stroke_cb: angle: %f %s",
              a, (a > 15) ? "(bad)" : "(good)");
      if (a > 15) {
         // Fail if angle is too extreme
         WORLD::message("Bad angle");
         return 0;
      }

      // calculate extrude width
      double dist = fgest.length()/fvec.length();

      err_adv(debug, "INFLATE::stroke_cb: strong_edge_len: %f, gest_len: %f, \
fvect_len: %f", avg_strong_edge_len(face), fgest.length(), fvec.length() );

      // Convert to relative to local edge length
      dist /= avg_strong_edge_len(face);
      if (fvec*fgest<0)
         dist=-dist; // Get the sign right

      // Store the new inflate distance
      _preview_dist = dist;
   }

   return 1;    // we used up the gesture...
}

//! Given an initial slash gesture (or delayed slash) on a
//! defined plane (FLOOR, Cursor3D, or existing Bpoint), set up
//! the widget to provide a guideline for drawing a straight line.
bool
SWEEP_POINT::setup(CGESTUREptr& slash, double dur)
{

   static bool debug =
      Config::get_var_bool("DEBUG_SWEEP_SETUP",false) || debug_all;

   err_adv(debug, "SWEEP_POINT::setup");

   // check the gesture
   if (!(slash && slash->straightness() > 0.9)) {
      err_adv(debug, "SWEEP_POINT::setup: gesture is bad");
      return false;
   }

   // find the (straight) Bpoint near slash start
   _point = Bpoint::hit_ctrl_point(slash->start());

   return false;
//   return SWEEP_BASE::setup(_curve->mesh(), o, endpt, dur);
}

//! Given an initial slash gesture (or delayed slash) near the
//! center of an existing straight Bcurve, set up the widget to
//! do a sweep cross-ways to the Bcurve:
bool
SWEEP_LINE::setup(CGESTUREptr& slash, double dur)
{

   static bool debug =
      Config::get_var_bool("DEBUG_SWEEP_SETUP",false) || debug_all;

   err_adv(debug, "SWEEP_LINE::setup");

   // check the gesture
   if (!(slash && slash->straightness() > 0.99)) {
      err_adv(debug, "SWEEP_LINE::setup: gesture is bad");
      return false;
   }

   // find the (straight) Bcurve near slash start
   _curve = Bcurve::hit_ctrl_curve(slash->start());
   if (!(_curve && _curve->is_straight())) {
      err_adv(debug, "SWEEP_LINE::setup: no straight curve at start");
      return false;
   }

   // find endpoints
   Bpoint *b1 = _curve->b1(), *b2 = _curve->b2();
   assert(b1 && b2);    // straight curve must have endpoints

   // curve cannot be connected to other curves
   if (b1->vert()->degree() != 1 || b2->vert()->degree() != 1) {
      err_adv(debug, "SWEEP_LINE::setup: curve is not isolated");
      return false;
   }

   // ensure the gesture starts near the center of the straight line Bcurve:
   {
      PIXEL a = b1->vert()->pix();
      PIXEL b = b2->vert()->pix();
      double t = (slash->start() - a).tlen(b-a);
      if (t < 0.35 || t > 0.65) {
         err_adv(debug, "SWEEP_LINE::setup: gesture not near center of line");
         return false;
      }
   }

   // find the plane to work in
   _plane = check_plane(shared_plane(b1, b2));
   if (!_plane.is_valid()) {
      err_adv(debug, "SWEEP_LINE::setup: no valid plane");
      return false;
   }

   // check that slash is perpendicular to line
   Wpt  a = b1->loc();  // endpoint at b1
   Wpt  b = b2->loc();  // endpoint at b2
   Wvec t = b - a;      // vector from endpt a to endpt b
   Wpt  o = a + t/2;    // center of straight line curve
   Wvec n = cross(_plane.normal(), t); // direction across line ab

   Wvec slash_vec = endpt_vec(slash, _plane);
   const double ALIGN_ANGLE_THRESH = 15;
   double angle = rad2deg(slash_vec.angle(n));
   if (angle > 90) {
      angle = 180 - angle;
      n = -n;
   }
   if (angle > ALIGN_ANGLE_THRESH) {
      err_adv(debug, "SWEEP_LINE::setup: slash is not perpendicular to line");
      err_adv(debug, "                   angle: %f", angle);
      return false;
   }

   // compute guideline endpoint:
   Wpt endpt = o + n.normalized()*a.dist(b);

   return SWEEP_BASE::setup(_curve->mesh(), o, endpt, dur);
}