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/*
collision.cc -- implement Collision
source file of the GNU LilyPond music typesetter
(c) 1997--1998 Han-Wen Nienhuys <hanwen@cs.uu.nl>
*/
#include "debug.hh"
#include "collision.hh"
#include "note-column.hh"
#include "note-head.hh"
#include "paper-def.hh"
Collision::Collision()
{
}
void
Collision::add_column (Note_column* ncol_l)
{
// ugh. Fixme.
clash_l_arr_.push (ncol_l);
add_element (ncol_l);
add_dependency (ncol_l);
}
/**
should derive of Array.
*/
static
int idx (int dir, bool h_shift_b)
{
assert (abs (dir) == 1);
int j = dir > 0 ? 0 : 3;
if (h_shift_b)
j += dir;
return j;
}
/** This complicated routine moves note columns around horizontally
(and rests vertically) to ensure that notes don't clash.
This should be done better, probably.
This routine is dedicated to Stine Randmael :-)
*/
void
Collision::do_pre_processing()
{
if (clash_l_arr_.size() <= 1)
return;
/*
[stem up, stem up shifted, stem down shifted, stem down]
*/
Array<Note_column*> clash_group_arr_a[4];
for (int i=0; i < clash_l_arr_.size(); i++)
{
Note_column* c_l = clash_l_arr_[i];
if (! c_l->dir_)
{
warning (_ ("No stem direction set. Ignoring column in clash."));
continue;
}
int d = (c_l->dir_);
clash_group_arr_a[idx (d, c_l->h_shift_b_)].push (c_l);
}
for (int j=0; j < 4; j++)
{
if (clash_group_arr_a[j].size() > 1)
{
warning (_ ("Too many clashing notecolumns. Ignoring them."));
return;
}
}
int d = 1;
do
{
if (!clash_group_arr_a[idx (d, false)].size())
{
clash_group_arr_a[idx (d, false)] = clash_group_arr_a[idx (d, true)];
clash_group_arr_a[idx (d, true)].clear();
}
}
while ((d *= -1) != 1);
Interval_t<int> y_extent[4];
Note_column * col_l_a[4];
Real x_off [4];
int y_off[4];
for (int j =0 ; j < 4; j++)
{
if (clash_group_arr_a[j].size())
col_l_a[j] = clash_group_arr_a[j][0];
else
col_l_a[j] = 0;
if (col_l_a[j])
{
y_extent[j] = col_l_a[j]->head_positions_interval();
}
x_off [j] = 0.0;
y_off[j] = 0;
}
do
{
x_off[idx (d, true)] = d*0.5;
}
while ((d *= -1) != 1);
// y_extent: smallest y-pos noteball interval containing all balls
// 4 (0..3) groups: stem up/down; shift on/off;
Interval_t<int> middle (y_extent[idx (-1,0)].max(),
y_extent[idx (1,0)].min());
Interval_t<int> open_middle (y_extent[idx (-1,0)].max()+1, y_extent[idx (1,0)].min ()-1);
do
{
if (!open_middle.contains_b (y_extent[idx (d,true)]))
x_off[idx (d, true)] = d *1.0 ;
} while ((d *= -1) != 1);
if (!middle.empty_b()
&& middle.length() < 2 && col_l_a[idx (1,0)] && col_l_a[idx (-1,0)]) {
// reproduction of bugfix at 3am ?
Note_head * nu_l= col_l_a[idx (1,0)]->head_l_arr_[0];
Note_head * nd_l = col_l_a[idx (-1,0)]->head_l_arr_.top();
if (! (nu_l->balltype_i_ == nd_l->balltype_i_
&& nu_l->dots_i_ == nd_l->dots_i_ && middle.length() == 0))
{
x_off[idx (1,0)] -= 0.5;
x_off[idx (1,1)] -= 0.5;
x_off[idx (-1,1)] += 0.5;
x_off[idx (-1,0)] += 0.5;
}
}
Real inter_f = paper()->internote_f ();
Real wid_f = paper()->note_width ();
for (int j=0; j < 4; j++)
{
if (col_l_a[j])
{
/* collision.cc:138: request for method `translate' is ambiguous
(shaddup)
*/
Offset o (x_off[j] * wid_f, y_off[j] * inter_f);
col_l_a[j]->translate (o);
// ((Score_element*)col_l_a[j])->translate (o);
}
}
}
void
Collision::do_substitute_dependency (Score_element*o_l,Score_element*n_l)
{
if (o_l)
{
clash_l_arr_.substitute (dynamic_cast<Note_column *> (o_l),
dynamic_cast <Note_column *> (n_l));
}
}
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