Gets vertical skylines from grob stencils

flower/test-interval-set.cc

+/*
+  This file is part of LilyPond, the GNU music typesetter.
+
+  Copyright (C) 2012 Joe Neeman <joeneeman@gmail.com>
+
+  LilyPond is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  LilyPond is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with LilyPond.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "interval-set.hh"
+
+#include "yaffut.hh"
+
+using namespace std;
+
+FUNC (interval_set_union)
+{
+  vector<Interval> ivs;
+
+  // Overlapping intervals.
+  ivs.push_back (Interval (-1, 1));
+  ivs.push_back (Interval (0, 3));
+  ivs.push_back (Interval (1, 2));
+  Interval_set result = Interval_set::interval_union (ivs);
+  EQUAL (result.intervals ().size (), 1);
+  // Compare intervals using to_string, since yaffut doesn't know how to compare intervals.
+  EQUAL (result.intervals ()[0].to_string (), Interval (-1, 3).to_string ());
+
+  // Non-overlapping intervals.
+  ivs.push_back (Interval (-5, -4));
+  result = Interval_set::interval_union (ivs);
+  EQUAL (result.intervals ().size (), 2);
+  EQUAL (result.intervals ()[0].to_string (), Interval (-5, -4).to_string ());
+  EQUAL (result.intervals ()[1].to_string (), Interval (-1, 3).to_string ());
+
+  // Infinite intervals.
+  ivs.push_back (Interval (-infinity_f, -4));
+  result = Interval_set::interval_union (ivs);
+  EQUAL (result.intervals ().size (), 2);
+  EQUAL (result.intervals ()[0].to_string (), Interval (-infinity_f, -4).to_string ());
+  EQUAL (result.intervals ()[1].to_string (), Interval (-1, 3).to_string ());
+
+  // Empty intervals.
+  ivs.push_back (Interval (infinity_f, -infinity_f));
+  result = Interval_set::interval_union (ivs);
+  EQUAL (result.intervals ().size (), 2);
+}
+
+FUNC (interval_set_nearest_point)
+{
+  vector<Interval> ivs;
+
+  ivs.push_back (Interval (-3, -1));
+  ivs.push_back (Interval (1, 3));
+  Interval_set set = Interval_set::interval_union (ivs);
+
+  // If the point is in the set, direction does not matter.
+  EQUAL (set.nearest_point (-2, UP), -2);
+  EQUAL (set.nearest_point (-2, DOWN), -2);
+  EQUAL (set.nearest_point (-2, CENTER), -2);
+
+  // If the point is not in the set, direction does matter.
+  EQUAL (set.nearest_point (-0.5, UP), 1);
+  EQUAL (set.nearest_point (-0.5, DOWN), -1);
+  EQUAL (set.nearest_point (-0.5, CENTER), -1);
+  EQUAL (set.nearest_point (0.5, CENTER), 1);
+
+  // The return value can be +- infinity.
+  EQUAL (set.nearest_point (5, UP), infinity_f);
+  EQUAL (set.nearest_point (5, DOWN), 3);
+  EQUAL (set.nearest_point (-5, DOWN), -infinity_f);
+  EQUAL (set.nearest_point (-5, UP), -3);
+}
+
+FUNC (interval_set_complement)
+{
+  vector<Interval> ivs;
+
+  ivs.push_back (Interval (-3, -1));
+  ivs.push_back (Interval (1, 3));
+  Interval_set set = Interval_set::interval_union (ivs).complement ();
+  EQUAL (set.intervals ().size (), 3);
+  EQUAL (set.intervals ()[0].to_string (), Interval (-infinity_f, -3).to_string ());
+  EQUAL (set.intervals ()[1].to_string (), Interval (-1, 1).to_string ());
+  EQUAL (set.intervals ()[2].to_string (), Interval (3, infinity_f).to_string ());
+
+  // Half-infinite sets are handled correctly.
+  ivs.push_back (Interval (-infinity_f, -2));
+  set = Interval_set::interval_union (ivs).complement ();
+  EQUAL (set.intervals ().size (), 2);
+  EQUAL (set.intervals ()[0].to_string (), Interval (-1, 1).to_string ());
+  EQUAL (set.intervals ()[1].to_string (), Interval (3, infinity_f).to_string ());
+
+  // Full and empty sets are handled correctly.
+  set = Interval_set ().complement ();
+  EQUAL (set.intervals ().size (), 1);
+  EQUAL (set.intervals ()[0].to_string (), Interval (-infinity_f, infinity_f).to_string ());
+  set = set.complement ();
+  EQUAL (set.intervals ().size (), 0);
+}