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/*
stencil.cc -- implement Stencil
source file of the GNU LilyPond music typesetter
(c) 1997--2007 Han-Wen Nienhuys <hanwen@xs4all.nl>
*/
#include "stencil.hh"
#include "main.hh"
#include "font-metric.hh"
#include "input.hh"
#include "string-convert.hh"
#include "warn.hh"
#include "ly-smobs.icc"
Stencil::Stencil ()
{
expr_ = SCM_EOL;
set_empty (true);
}
Stencil::Stencil (Box b, SCM func)
{
expr_ = func;
dim_ = b;
}
int
Stencil::print_smob (SCM, SCM port, scm_print_state *)
{
scm_puts ("#<Stencil ", port);
scm_puts (" >", port);
return 1;
}
SCM
Stencil::mark_smob (SCM smob)
{
Stencil *s = (Stencil *) SCM_CELL_WORD_1 (smob);
return s->expr_;
}
IMPLEMENT_SIMPLE_SMOBS (Stencil);
IMPLEMENT_TYPE_P (Stencil, "ly:stencil?");
IMPLEMENT_DEFAULT_EQUAL_P (Stencil);
Interval
Stencil::extent (Axis a) const
{
return dim_[a];
}
bool
Stencil::is_empty () const
{
return (expr_ == SCM_EOL
|| dim_[X_AXIS].is_empty ()
|| dim_[Y_AXIS].is_empty ());
}
SCM
Stencil::expr () const
{
return expr_;
}
Box
Stencil::extent_box () const
{
return dim_;
}
void
Stencil::rotate (Real a, Offset off)
{
rotate_degrees (a * 180/M_PI, off);
}
/*
Rotate this stencil around the point RELATIVE_OFF.
RELATIVE_OFF is measured in terms of the extent of the stencil, so
-1 = LEFT/DOWN edge, 1 = RIGHT/UP edge.
*/
void
Stencil::rotate_degrees (Real a, Offset relative_off)
{
const Real x_cen = extent (X_AXIS).center ();
const Real y_cen = extent (Y_AXIS).center ();
/*
* Calculate the center of rotation
*/
const Real x = x_cen + relative_off[X_AXIS] * x_cen;
const Real y = y_cen + relative_off[Y_AXIS] * y_cen;
/*
* Build scheme expression (processed in stencil-interpret.cc)
*/
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);
/*
* Calculate the new bounding box
*/
vector<Offset> pts;
pts.push_back (Offset (-x_cen, -y_cen));
pts.push_back (Offset (x_cen, -y_cen));
pts.push_back (Offset (x_cen, y_cen));
pts.push_back (Offset (-x_cen, y_cen));
const Offset rot = complex_exp (Offset (0, a * M_PI / 180.0));
dim_.set_empty ();
for (vsize i = 0; i < pts.size (); i++)
dim_.add_point (pts[i] * rot + Offset (x_cen, y_cen));
}
void
Stencil::translate (Offset o)
{
Axis a = X_AXIS;
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);
}
incr (a);
}
expr_ = scm_list_n (ly_symbol2scm ("translate-stencil"),
ly_offset2scm (o),
expr_, SCM_UNDEFINED);
if (!is_empty ())
dim_.translate (o);
}
void
Stencil::translate_axis (Real x, Axis a)
{
Offset o (0, 0);
o[a] = x;
translate (o);
}
void
Stencil::add_stencil (Stencil const &s)
{
expr_ = scm_list_3 (ly_symbol2scm ("combine-stencil"), s.expr_, expr_);
dim_.unite (s.dim_);
}
void
Stencil::set_empty (bool e)
{
if (e)
{
dim_[X_AXIS].set_empty ();
dim_[Y_AXIS].set_empty ();
}
else
{
dim_[X_AXIS] = Interval (0, 0);
dim_[Y_AXIS] = Interval (0, 0);
}
}
void
Stencil::align_to (Axis a, Real x)
{
if (is_empty ())
return;
Interval i (extent (a));
translate_axis (-i.linear_combination (x), a);
}
/* See scheme Function. */
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 ())
{
programming_error ("Stencil::add_at_edge: adding empty stencil.");
his_extent = 0.0;
}
else
his_extent = i[-d];
Real offset = (my_extent.is_empty () ? 0.0 : my_extent[d] - his_extent)
+ d * padding;
Stencil toadd (s);
toadd.translate_axis (offset, a);
add_stencil (toadd);
}
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 ()));
return new_stencil;
}
/* convenience */
Stencil
Stencil::translated (Offset z) const
{
Stencil s (*this);
s.translate (z);
return s;
}
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