source file of the GNU LilyPond music typesetter
- (c) 1997--2002 Han-Wen Nienhuys <hanwen@cs.uu.nl>
+ (c) 1997--2003 Han-Wen Nienhuys <hanwen@cs.uu.nl>
Jan Nieuwenhuizen <janneke@gnu.org>
#include "molecule.hh"
#include "lookup.hh"
#include "font-metric.hh"
+#include "interval.hh"
+
+Molecule
+Lookup::dot (Offset p, Real radius)
+{
+ SCM at = (scm_list_n (ly_symbol2scm ("dot"),
+ gh_double2scm (p[X_AXIS]),
+ gh_double2scm (p[Y_AXIS]),
+ gh_double2scm (radius),
+ SCM_UNDEFINED));
+ Box box;
+ box.add_point (p - Offset (radius, radius));
+ box.add_point (p + Offset (radius, radius));
+ return Molecule (box, at);
+}
Molecule
Lookup::beam (Real slope, Real width, Real thick)
Molecule
Lookup::line (Real th, Offset f, Offset t)
{
- SCM at = (scm_list_n (ly_symbol2scm ("draw-line"),
+ SCM at = scm_list_n (ly_symbol2scm ("draw-line"),
gh_double2scm (th),
gh_double2scm (f[X_AXIS]),
gh_double2scm (f[Y_AXIS]),
gh_double2scm (t[X_AXIS]),
gh_double2scm (t[Y_AXIS]),
- SCM_UNDEFINED));
+ SCM_UNDEFINED);
Box box;
box.add_point (f);
return Molecule (box, at);
}
+Molecule
+Lookup::horizontal_line (Interval w, Real th)
+{
+ SCM at = scm_list_n (ly_symbol2scm ("horizontal-line"),
+ gh_double2scm (w[LEFT]),
+ gh_double2scm (w[RIGHT]),
+ gh_double2scm (th),
+ SCM_UNDEFINED);
+
+
+ Box box ;
+ box[X_AXIS] = w;
+ box[Y_AXIS] = Interval (-th/2,th/2);
+
+ return Molecule (box, at);
+}
+
Molecule
Lookup::blank (Box b)
{
- return Molecule (b, SCM_EOL);
+ return Molecule (b, scm_makfrom0str (""));
}
Molecule
return Molecule (b,at);
}
+LY_DEFINE(ly_round_filled_box, "ly:round-filled-box",
+ 2, 0,0,
+ (SCM b, SCM blot),
+ "Make a box with rounded corners. B is a pair of number-pairs, and BLOT a number")
+{
+ SCM_ASSERT_TYPE(gh_number_p (blot), blot, SCM_ARG2, __FUNCTION__, "number") ;
+ SCM_ASSERT_TYPE(gh_pair_p (b), b, SCM_ARG4, __FUNCTION__, "pair") ;
+
+ SCM_ASSERT_TYPE(ly_number_pair_p (gh_car (b)), gh_car (b), SCM_ARG1, __FUNCTION__, "number-pair") ;
+ SCM_ASSERT_TYPE(ly_number_pair_p (gh_cdr (b)), gh_cdr (b), SCM_ARG1, __FUNCTION__, "number-pair") ;
+
+ Interval x (ly_scm2interval (gh_car (b)));
+ Interval y (ly_scm2interval (gh_cdr (b)));
+
+ return Lookup::roundfilledbox (Box (x,y),
+ gh_scm2double (blot)).smobbed_copy();
+
+}
+
+
+/*
+ * Create Molecule that represents a filled polygon with round edges.
+ *
+ * LIMITATIONS:
+ *
+ * (a) Only outer (convex) edges are rounded.
+ *
+ * (b) This algorithm works as expected only for polygons whose edges
+ * do not intersect. For example, the polygon ((0, 0), (q, 0), (0,
+ * q), (q, q)) has an intersection at point (q/2, q/2) and therefore
+ * will give a strange result. Even non-adjacent edges that just
+ * touch each other will in general not work as expected for non-null
+ * blotdiameter.
+ *
+ * (c) Given a polygon ((x0, y0), (x1, y1), ... , (x(n-1), y(n-1))),
+ * if there is a natural number k such that blotdiameter is greater
+ * than the maximum of { | (x(k mod n), y(k mod n)) - (x((k+1) mod n),
+ * y((k+1) mod n)) |, | (x(k mod n), y(k mod n)) - (x((k+2) mod n),
+ * y((k+2) mod n)) |, | (x((k+1) mod n), y((k+1) mod n)) - (x((k+2)
+ * mod n), y((k+2) mod n)) | }, then the outline of the rounded
+ * polygon will exceed the outline of the core polygon. In other
+ * words: Do not draw rounded polygons that have a leg smaller or
+ * thinner than blotdiameter (or set blotdiameter to a sufficiently
+ * small value -- maybe even 0.0)!
+ *
+ * NOTE: Limitations (b) and (c) arise from the fact that round edges
+ * are made by moulding sharp edges to round ones rather than adding
+ * to a core filled polygon. For details of these two different
+ * approaches, see the thread upon the ledger lines patch that started
+ * on March 25, 2002 on the devel mailing list. The below version of
+ * round_filled_polygon() sticks to the moulding model, which the
+ * majority of the list participants finally voted for. This,
+ * however, results in the above limitations and a much increased
+ * complexity of the algorithm, since it has to compute a shrinked
+ * polygon -- which is not trivial define precisely and unambigously.
+ * With the other approach, one simply could move a circle of size
+ * blotdiameter along all edges of the polygon (which is what the
+ * postscript routine in the backend effectively does, but on the
+ * shrinked polygon). --jr
+ */
+Molecule
+Lookup::round_filled_polygon (Array<Offset> points, Real blotdiameter)
+{
+ /* TODO: Maybe print a warning if one of the above limitations
+ applies to the given polygon. However, this is quite complicated
+ to check. */
+
+ /* remove consecutive duplicate points */
+ const Real epsilon = 0.01;
+ for (int i = 0; i < points.size ();)
+ {
+ int next_i = (i + 1) % points.size ();
+ Real d = (points[i] - points[next_i]).length ();
+ if (d < epsilon)
+ points.del (next_i);
+ else
+ i++;
+ }
+
+ /* special cases: degenerated polygons */
+ if (points.size () == 0)
+ return Molecule ();
+ if (points.size () == 1)
+ return dot (points[0], 0.5 * blotdiameter);
+ if (points.size () == 2)
+ return line (blotdiameter, points[0], points[1]);
+
+ /* shrink polygon in size by 0.5 * blotdiameter */
+ Array<Offset> shrinked_points;
+ shrinked_points.set_size (points.size ());
+ bool ccw = 1; // true, if three adjacent points are counterclockwise ordered
+ for (int i = 0; i < points.size (); i++)
+ {
+ int i0 = i;
+ int i1 = (i + 1) % points.size ();
+ int i2 = (i + 2) % points.size ();
+ Offset p0 = points[i0];
+ Offset p1 = points[i1];
+ Offset p2 = points[i2];
+ Offset p10 = p0 - p1;
+ Offset p12 = p2 - p1;
+ if (p10.length () != 0.0)
+ { // recompute ccw
+ Real phi = p10.arg ();
+ // rotate (p2 - p0) by (-phi)
+ Offset q = complex_multiply (p2 - p0, complex_exp (Offset (1.0, -phi)));
+
+ if (q[Y_AXIS] > 0)
+ ccw = 1;
+ else if (q[Y_AXIS] < 0)
+ ccw = 0;
+ else {} // keep ccw unchanged
+ }
+ else {} // keep ccw unchanged
+ Offset p10n = (1.0 / p10.length ()) * p10; // normalize length to 1.0
+ Offset p12n = (1.0 / p12.length ()) * p12;
+ Offset p13n = 0.5 * (p10n + p12n);
+ Offset p14n = 0.5 * (p10n - p12n);
+ Offset p13;
+ Real d = p13n.length () * p14n.length (); // distance p3n to line(p1..p0)
+ if (d < epsilon)
+ // special case: p0, p1, p2 are on a single line => build
+ // vector orthogonal to (p2-p0) of length 0.5 blotdiameter
+ {
+ p13[X_AXIS] = p10[Y_AXIS];
+ p13[Y_AXIS] = -p10[X_AXIS];
+ p13 = (0.5 * blotdiameter / p13.length ()) * p13;
+ }
+ else
+ p13 = (0.5 * blotdiameter / d) * p13n;
+ shrinked_points[i1] = p1 + ((ccw) ? p13 : -p13);
+ }
+
+ /* build scm expression and bounding box */
+ SCM shrinked_points_scm = SCM_EOL;
+ Box box;
+ for (int i = 0; i < shrinked_points.size (); i++)
+ {
+ SCM x = gh_double2scm (shrinked_points[i][X_AXIS]);
+ SCM y = gh_double2scm (shrinked_points[i][Y_AXIS]);
+ shrinked_points_scm = gh_cons (x, gh_cons (y, shrinked_points_scm));
+ box.add_point (points[i]);
+ }
+ SCM polygon_scm = scm_list_n (ly_symbol2scm ("polygon"),
+ ly_quote_scm (shrinked_points_scm),
+ gh_double2scm (blotdiameter),
+ SCM_UNDEFINED);
+
+ Molecule polygon = Molecule (box, polygon_scm);
+ shrinked_points.clear ();
+ return polygon;
+}
+
Molecule
Lookup::frame (Box b, Real thick)
{
Molecule m;
Direction d = LEFT;
- Axis a = X_AXIS;
- while (a < NO_AXES)
+ for (Axis a = X_AXIS; a < NO_AXES; a = Axis (a + 1))
{
+ Axis o = Axis ((a+1)%NO_AXES);
do
{
- Axis o = Axis ((a+1)%NO_AXES);
-
Box edges;
edges[a] = b[a][d] + 0.5 * thick * Interval (-1, 1);
edges[o][DOWN] = b[o][DOWN] - thick/2;
}
- SCM at = (scm_list_n (ly_symbol2scm ("bezier-sandwich"),
+ SCM at = (scm_list_n (ly_symbol2scm ("bezier-bow"),
ly_quote_scm (list),
gh_double2scm (linethick),
SCM_UNDEFINED));
{
Molecule r = fm->find_by_name ("accordion-accDiscant");
m.add_molecule (r);
- if (reg.left_str (1) == "F")
+ if (reg.left_string (1) == "F")
{
Molecule d = fm->find_by_name ("accordion-accDot");
d.translate_axis (staff_space * 2.5 PT, Y_AXIS);
m.add_molecule (d);
- reg = reg.right_str (reg.length_i ()-1);
+ reg = reg.right_string (reg.length ()-1);
}
int eflag = 0x00;
- if (reg.left_str (3) == "EEE")
+ if (reg.left_string (3) == "EEE")
{
eflag = 0x07;
- reg = reg.right_str (reg.length_i ()-3);
+ reg = reg.right_string (reg.length ()-3);
}
- else if (reg.left_str (2) == "EE")
+ else if (reg.left_string (2) == "EE")
{
eflag = 0x05;
- reg = reg.right_str (reg.length_i ()-2);
+ reg = reg.right_string (reg.length ()-2);
}
- else if (reg.left_str (2) == "Eh")
+ else if (reg.left_string (2) == "Eh")
{
eflag = 0x04;
- reg = reg.right_str (reg.length_i ()-2);
+ reg = reg.right_string (reg.length ()-2);
}
- else if (reg.left_str (1) == "E")
+ else if (reg.left_string (1) == "E")
{
eflag = 0x02;
- reg = reg.right_str (reg.length_i ()-1);
+ reg = reg.right_string (reg.length ()-1);
}
if (eflag & 0x02)
{
d.translate_axis (-0.8 * staff_space PT, X_AXIS);
m.add_molecule (d);
}
- if (reg.left_str (2) == "SS")
+ if (reg.left_string (2) == "SS")
{
Molecule d = fm->find_by_name ("accordion-accDot");
d.translate_axis (0.5 * staff_space PT, Y_AXIS);
m.add_molecule (d);
d.translate_axis (-0.8 * staff_space PT, X_AXIS);
m.add_molecule (d);
- reg = reg.right_str (reg.length_i ()-2);
+ reg = reg.right_string (reg.length ()-2);
}
- if (reg.left_str (1) == "S")
+ if (reg.left_string (1) == "S")
{
Molecule d = fm->find_by_name ("accordion-accDot");
d.translate_axis (0.5 * staff_space PT, Y_AXIS);
m.add_molecule (d);
- reg = reg.right_str (reg.length_i ()-1);
+ reg = reg.right_string (reg.length ()-1);
}
}
else if (sym == "Freebase")
{
Molecule r = fm->find_by_name ("accordion-accFreebase");
m.add_molecule (r);
- if (reg.left_str (1) == "F")
+ if (reg.left_string (1) == "F")
{
Molecule d = fm->find_by_name ("accordion-accDot");
d.translate_axis (staff_space * 1.5 PT, Y_AXIS);
m.add_molecule (d);
- reg = reg.right_str (reg.length_i ()-1);
+ reg = reg.right_string (reg.length ()-1);
}
if (reg == "E")
{
{
Molecule r = fm->find_by_name ("accordion-accBayanbase");
m.add_molecule (r);
- if (reg.left_str (1) == "T")
+ if (reg.left_string (1) == "T")
{
Molecule d = fm->find_by_name ("accordion-accDot");
d.translate_axis (staff_space * 2.5 PT, Y_AXIS);
m.add_molecule (d);
- reg = reg.right_str (reg.length_i ()-1);
+ reg = reg.right_string (reg.length ()-1);
}
/* include 4' reed just for completeness. You don't want to use this. */
- if (reg.left_str (1) == "F")
+ if (reg.left_string (1) == "F")
{
Molecule d = fm->find_by_name ("accordion-accDot");
d.translate_axis (staff_space * 1.5 PT, Y_AXIS);
m.add_molecule (d);
- reg = reg.right_str (reg.length_i ()-1);
+ reg = reg.right_string (reg.length ()-1);
}
- if (reg.left_str (2) == "EE")
+ if (reg.left_string (2) == "EE")
{
Molecule d = fm->find_by_name ("accordion-accDot");
d.translate_axis (staff_space * 0.5 PT, Y_AXIS);
m.add_molecule (d);
d.translate_axis (-0.8 * staff_space PT, X_AXIS);
m.add_molecule (d);
- reg = reg.right_str (reg.length_i ()-2);
+ reg = reg.right_string (reg.length ()-2);
}
- if (reg.left_str (1) == "E")
+ if (reg.left_string (1) == "E")
{
Molecule d = fm->find_by_name ("accordion-accDot");
d.translate_axis (staff_space * 0.5 PT, Y_AXIS);
m.add_molecule (d);
- reg = reg.right_str (reg.length_i ()-1);
+ reg = reg.right_string (reg.length ()-1);
}
}
else if (sym == "Stdbase")
{
Molecule r = fm->find_by_name ("accordion-accStdbase");
m.add_molecule (r);
- if (reg.left_str (1) == "T")
+ if (reg.left_string (1) == "T")
{
Molecule d = fm->find_by_name ("accordion-accDot");
d.translate_axis (staff_space * 3.5 PT, Y_AXIS);
m.add_molecule (d);
- reg = reg.right_str (reg.length_i ()-1);
+ reg = reg.right_string (reg.length ()-1);
}
- if (reg.left_str (1) == "F")
+ if (reg.left_string (1) == "F")
{
Molecule d = fm->find_by_name ("accordion-accDot");
d.translate_axis (staff_space * 2.5 PT, Y_AXIS);
m.add_molecule (d);
- reg = reg.right_str (reg.length_i ()-1);
+ reg = reg.right_string (reg.length ()-1);
}
- if (reg.left_str (1) == "M")
+ if (reg.left_string (1) == "M")
{
Molecule d = fm->find_by_name ("accordion-accDot");
d.translate_axis (staff_space * 2 PT, Y_AXIS);
d.translate_axis (staff_space PT, X_AXIS);
m.add_molecule (d);
- reg = reg.right_str (reg.length_i ()-1);
+ reg = reg.right_string (reg.length ()-1);
}
- if (reg.left_str (1) == "E")
+ if (reg.left_string (1) == "E")
{
Molecule d = fm->find_by_name ("accordion-accDot");
d.translate_axis (staff_space * 1.5 PT, Y_AXIS);
m.add_molecule (d);
- reg = reg.right_str (reg.length_i ()-1);
+ reg = reg.right_string (reg.length ()-1);
}
- if (reg.left_str (1) == "S")
+ if (reg.left_string (1) == "S")
{
Molecule d = fm->find_by_name ("accordion-accDot");
d.translate_axis (staff_space * 0.5 PT, Y_AXIS);
m.add_molecule (d);
- reg = reg.right_str (reg.length_i ()-1);
+ reg = reg.right_string (reg.length ()-1);
}
}
/* ugh maybe try to use regular font for S.B. and B.B and only use one font
}
Molecule
-Lookup::bracket (Axis a, Interval iv, Direction d, Real thick, Real protude)
+Lookup::bracket (Axis a, Interval iv, Real thick, Real protude)
{
Box b;
Axis other = Axis((a+1)%2);
Molecule m = filledbox (b);
b[a] = Interval (iv[UP] - thick, iv[UP]);
- Interval oi = Interval (-thick/2, thick/2 + protude) ;
- oi *= d;
+ Interval oi = Interval (-thick/2, thick/2 + fabs (protude)) ;
+ oi *= sign (protude);
b[other] = oi;
m.add_molecule (filledbox (b));
b[a] = Interval (iv[DOWN], iv[DOWN] +thick);
return m;
}
-SCM
-ly_bracket (SCM a, SCM iv, SCM d, SCM t, SCM p)
+Molecule
+Lookup::triangle (Interval iv, Real thick, Real protude)
{
- SCM_ASSERT_TYPE(ly_axis_p (a), a, SCM_ARG1, __FUNCTION__, "axis") ;
- SCM_ASSERT_TYPE(ly_number_pair_p (iv), iv, SCM_ARG1, __FUNCTION__, "number pair") ;
- SCM_ASSERT_TYPE(ly_dir_p (d), a, SCM_ARG1, __FUNCTION__, "direction") ;
- SCM_ASSERT_TYPE(gh_number_p (t), a, SCM_ARG1, __FUNCTION__, "number") ;
- SCM_ASSERT_TYPE(gh_number_p(p), a, SCM_ARG1, __FUNCTION__, "number") ;
+ Box b ;
+ b[X_AXIS] = iv;
+ b[Y_AXIS] = Interval (0 <? protude , 0 >? protude);
+ SCM s = scm_list_n (ly_symbol2scm ("symmetric-x-triangle"),
+ gh_double2scm (thick),
+ gh_double2scm (iv.length()),
+ gh_double2scm (protude), SCM_UNDEFINED);
- return Lookup::bracket ((Axis)gh_scm2int (a), ly_scm2interval (iv),
- (Direction)gh_scm2int (d), gh_scm2double (t), gh_scm2double (p)).smobbed_copy ();
+ return Molecule (b, s);
}
-
-static void
-lookup_init ()
+
+
+/*
+ TODO: use rounded boxes.
+ */
+LY_DEFINE(ly_bracket ,"ly:bracket",
+ 4, 0, 0,
+ (SCM a, SCM iv, SCM t, SCM p),
+ "Make a bracket in direction @var{a}. The extent of the bracket is "
+ "given by @var{iv}. The wings protude by an amount of @var{p}, which "
+ "may be negative. The thickness is given by @var{t}.")
{
- scm_c_define_gsubr ("ly-bracket", 5, 0, 0, (Scheme_function_unknown) ly_bracket);
-}
+ SCM_ASSERT_TYPE(ly_axis_p (a), a, SCM_ARG1, __FUNCTION__, "axis") ;
+ SCM_ASSERT_TYPE(ly_number_pair_p (iv), iv, SCM_ARG2, __FUNCTION__, "number pair") ;
+ SCM_ASSERT_TYPE(gh_number_p (t), a, SCM_ARG3, __FUNCTION__, "number") ;
+ SCM_ASSERT_TYPE(gh_number_p (p), a, SCM_ARG4, __FUNCTION__, "number") ;
-ADD_SCM_INIT_FUNC (lookup,lookup_init);
+ return Lookup::bracket ((Axis)gh_scm2int (a), ly_scm2interval (iv),
+ gh_scm2double (t),
+ gh_scm2double (p)).smobbed_copy ();
+}
+