/*
- stencil.cc -- implement Stencil
+ This file is part of LilyPond, the GNU music typesetter.
- source file of the GNU LilyPond music typesetter
+ Copyright (C) 1997--2014 Han-Wen Nienhuys <hanwen@xs4all.nl>
- (c) 1997--2009 Han-Wen Nienhuys <hanwen@xs4all.nl>
+ 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 "stencil.hh"
Stencil::is_empty () const
{
return (expr_ == SCM_EOL
- || dim_[X_AXIS].is_empty ()
- || dim_[Y_AXIS].is_empty ());
+ || dim_.is_empty ());
+}
+
+bool
+Stencil::is_empty (Axis a) const
+{
+ return dim_.is_empty (a);
}
SCM
void
Stencil::rotate (Real a, Offset off)
{
- rotate_degrees (a * 180/M_PI, off);
+ rotate_degrees (a * 180 / M_PI, off);
}
/*
*/
expr_ = scm_list_n (ly_symbol2scm ("rotate-stencil"),
- scm_list_2 (scm_from_double (a),
- scm_cons (scm_from_double (x), scm_from_double (y))),
- expr_, SCM_UNDEFINED);
+ scm_list_2 (scm_from_double (a),
+ scm_cons (scm_from_double (x), scm_from_double (y))),
+ expr_, SCM_UNDEFINED);
/*
* Calculate the new bounding box
shifted_box.translate (-absolute_off);
vector<Offset> pts;
- pts.push_back (Offset (shifted_box.x ().at(LEFT), shifted_box.y ().at(DOWN)));
- pts.push_back (Offset (shifted_box.x ().at(RIGHT), shifted_box.y ().at(DOWN)));
- pts.push_back (Offset (shifted_box.x ().at(RIGHT), shifted_box.y ().at(UP)));
- pts.push_back (Offset (shifted_box.x ().at(LEFT), shifted_box.y ().at(UP)));
+ pts.push_back (Offset (shifted_box.x ().at (LEFT), shifted_box.y ().at (DOWN)));
+ pts.push_back (Offset (shifted_box.x ().at (RIGHT), shifted_box.y ().at (DOWN)));
+ pts.push_back (Offset (shifted_box.x ().at (RIGHT), shifted_box.y ().at (UP)));
+ pts.push_back (Offset (shifted_box.x ().at (LEFT), shifted_box.y ().at (UP)));
const Offset rot = complex_exp (Offset (0, a * M_PI / 180.0));
dim_.set_empty ();
while (a < NO_AXES)
{
if (isinf (o[a])
- || isnan (o[a])
-
- // ugh, hardcoded.
- || fabs (o[a]) > 1e6)
- {
- programming_error (String_convert::form_string ("Improbable offset for stencil: %f staff space", o[a])
- + "\n"
- + "Setting to zero.");
- o[a] = 0.0;
- if (strict_infinity_checking)
- scm_misc_error (__FUNCTION__, "Improbable offset.", SCM_EOL);
- }
+ || isnan (o[a])
+
+ // ugh, hardcoded.
+ || fabs (o[a]) > 1e6)
+ {
+ programming_error (String_convert::form_string ("Improbable offset for stencil: %f staff space", o[a])
+ + "\n"
+ + "Setting to zero.");
+ o[a] = 0.0;
+ if (strict_infinity_checking)
+ scm_misc_error (__FUNCTION__, "Improbable offset.", SCM_EOL);
+ }
incr (a);
}
- expr_ = scm_list_n (ly_symbol2scm ("translate-stencil"),
- ly_offset2scm (o),
- expr_, SCM_UNDEFINED);
+ if (!scm_is_null (expr_))
+ expr_ = scm_list_n (ly_symbol2scm ("translate-stencil"),
+ ly_offset2scm (o),
+ expr_, SCM_UNDEFINED);
if (!is_empty ())
dim_.translate (o);
}
translate (o);
}
+void
+Stencil::scale (Real x, Real y)
+{
+ expr_ = scm_list_3 (ly_symbol2scm ("scale-stencil"),
+ scm_list_2 (scm_from_double (x),
+ scm_from_double (y)),
+ expr_);
+ dim_[X_AXIS] *= x;
+ dim_[Y_AXIS] *= y;
+}
+
void
Stencil::add_stencil (Stencil const &s)
{
- expr_ = scm_list_3 (ly_symbol2scm ("combine-stencil"), s.expr_, expr_);
+ SCM cs = ly_symbol2scm ("combine-stencil");
+ if (scm_is_null (expr_))
+ expr_ = s.expr_;
+ else if (scm_is_null (s.expr_))
+ ;
+ else if (scm_is_pair (expr_)
+ && scm_is_eq (cs, scm_car (expr_)))
+ {
+ if (scm_is_pair (s.expr_)
+ && scm_is_eq (cs, scm_car (s.expr_)))
+ expr_ = scm_append (scm_list_2 (s.expr_, scm_cdr (expr_)));
+ else
+ expr_ = scm_cons2 (cs, s.expr_, scm_cdr (expr_));
+ }
+ else
+ {
+ if (scm_is_pair (s.expr_)
+ && scm_is_eq (cs, scm_car (s.expr_)))
+ expr_ = scm_append (scm_list_2 (s.expr_, scm_list_1 (expr_)));
+ else
+ expr_ = scm_list_3 (cs, s.expr_, expr_);
+ }
dim_.unite (s.dim_);
}
void
Stencil::align_to (Axis a, Real x)
{
- if (is_empty ())
+ if (is_empty (a))
return;
Interval i (extent (a));
}
/* See scheme Function. */
+
+// Any stencil that is empty in the orthogonal axis is spacing.
+// Spacing is not subjected to the max (0) rule and can thus be
+// negative.
+
void
Stencil::add_at_edge (Axis a, Direction d, Stencil const &s, Real padding)
{
- Interval my_extent = dim_[a];
- Interval i (s.extent (a));
- Real his_extent;
- if (i.is_empty ())
+ // Material that is empty in the axis of reference has only limited
+ // usefulness for combining. We still retain as much information as
+ // available since there may be uses like setting page links or
+ // background color or watermarks, and off-axis extents.
+
+ if (is_empty (a))
{
- programming_error ("Stencil::add_at_edge: adding empty stencil.");
- his_extent = 0.0;
+ add_stencil (s);
+ return;
}
- else
- his_extent = i[-d];
- Real offset = (my_extent.is_empty () ? 0.0 : my_extent[d] - his_extent)
- + d * padding;
+ Interval first_extent = extent (a);
+
+ if (s.is_empty (a))
+ {
+ Stencil toadd (s);
+ // translation does not affect axis-empty extent box.
+ toadd.translate_axis (first_extent[d], a);
+ add_stencil (toadd);
+ return;
+ }
+
+ Interval next_extent = s.extent (a);
+
+ bool first_is_spacing = is_empty (other_axis (a));
+ bool next_is_spacing = s.is_empty (other_axis (a));
+
+ Real offset = first_extent[d] - next_extent[-d];
+
+ if (!(first_is_spacing || next_is_spacing))
+ {
+ offset += d * padding;
+ }
Stencil toadd (s);
toadd.translate_axis (offset, a);
add_stencil (toadd);
}
+// Stencil::stack is mainly used for assembling lines or columns
+// of stencils. For the most common case of adding at the right, the
+// reference point of the added stencil is usually placed at the right
+// edge of the current one, unless the added stencil has a negative
+// left extent in which case its left edge is placed at the right edge
+// of the current one.
+//
+// Spacing is special in that it is applied without padding. Spacing
+// at the right edge shifts the right edge accordingly.
+//
+// For spacing at the left edge, there are several approaches. In
+// order to get to predictable behavior, we want to have at least a
+// continuous approach. An obvious idea is to do a "translate" by the
+// appropriate amount. Doing that while retaining the nominal left
+// edge seems like the most straightforward way.
+
+void
+Stencil::stack (Axis a, Direction d, Stencil const &s, Real padding, Real mindist)
+{
+ // Material that is empty in the axis of reference can't be sensibly
+ // stacked. We just revert to add_at_edge behavior then.
+
+ if (is_empty (a))
+ {
+ Stencil toadd (s);
+ toadd.add_stencil (*this);
+ expr_ = toadd.expr ();
+ dim_ = toadd.extent_box ();
+ return;
+ }
+
+ Interval first_extent = extent (a);
+
+ if (s.is_empty (a))
+ {
+ Stencil toadd (s);
+ toadd.translate_axis (first_extent[d], a);
+ toadd.add_stencil (*this);
+ expr_ = toadd.expr ();
+ dim_ = toadd.extent_box ();
+ return;
+ }
+
+ Interval next_extent = s.extent (a);
+
+ // It is somewhat tedious to special-case all spacing, but it turns
+ // out that not doing so makes it astonishingly hard to make the
+ // code do the correct thing.
+
+ // If first is spacing, we translate second accordingly without
+ // letting this affect its backward edge.
+ if (is_empty (other_axis (a)))
+ {
+ Stencil toadd (s);
+ Real offset = d * first_extent.delta ();
+ toadd.translate_axis (offset, a);
+ toadd.add_stencil (*this);
+ expr_ = toadd.expr ();
+ dim_ = toadd.extent_box ();
+ dim_[a][-d] = next_extent[-d];
+ dim_[a][d] = next_extent[d] + offset;
+ return;
+ }
+
+ // If next is spacing, similar action:
+ if (s.is_empty (other_axis (a)))
+ {
+ Stencil toadd (s);
+ Real offset = first_extent [d];
+ toadd.translate_axis (offset, a);
+ toadd.add_stencil (*this);
+ expr_ = toadd.expr ();
+ dim_ = toadd.extent_box ();
+ dim_[a][-d] = first_extent[-d];
+ dim_[a][d] = first_extent[d] + d * next_extent.delta ();
+ return;
+ }
+
+
+ Real offset = first_extent[d];
+
+ // If the added stencil has a backwardly protruding edge, we make
+ // room for it when combining.
+
+ if (d * next_extent [-d] < 0)
+ offset -= next_extent [-d];
+
+ offset += d * padding;
+
+ if (offset * d < mindist)
+ offset = d * mindist;
+
+ Stencil toadd (s);
+ toadd.translate_axis (offset, a);
+ toadd.add_stencil (*this);
+ expr_ = toadd.expr ();
+ dim_ = toadd.extent_box ();
+ dim_[a][-d] = first_extent [-d];
+ dim_[a][d] = next_extent [d] + offset;
+}
+
+
Stencil
Stencil::in_color (Real r, Real g, Real b) const
{
Stencil new_stencil (extent_box (),
- scm_list_3 (ly_symbol2scm ("color"),
- scm_list_3 (scm_from_double (r),
- scm_from_double (g),
- scm_from_double (b)),
- expr ()));
+ scm_list_3 (ly_symbol2scm ("color"),
+ scm_list_3 (scm_from_double (r),
+ scm_from_double (g),
+ scm_from_double (b)),
+ expr ()));
return new_stencil;
}
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