-
- SCM scontrols[8];
-
- for (int i = 0; i < 4; i++)
- scontrols[i] = ly_offset2scm (back.control_[i]);
- for (int i = 0; i < 4; i++)
- scontrols[i + 4] = ly_offset2scm (curve.control_[i]);
-
- /*
- Need the weird order b.o. the way PS want its arguments
- */
- int indices[] = {5, 6, 7, 4, 1, 2, 3, 0};
- SCM list = SCM_EOL;
- for (int i = 8; i--;)
- list = scm_cons (scontrols[indices[i]], list);
-
- SCM at = (scm_list_n (ly_symbol2scm ("bezier-sandwich"),
- ly_quote_scm (list),
- scm_from_double (linethick),
- SCM_UNDEFINED));
- Box b (curve.extent (X_AXIS),
- curve.extent (Y_AXIS));
-
- b[X_AXIS].unite (back.extent (X_AXIS));
- b[Y_AXIS].unite (back.extent (Y_AXIS));
-
- b.widen (0.5 * linethick, 0.5 * linethick);
- return Stencil (b, at);
+
+ if (!scm_is_pair (dash_details))
+ {
+ /* solid slur */
+ return_value = bezier_sandwich (back, curve, linethick);
+ }
+ else
+ {
+ /* dashed or combination slur */
+ int num_segments = scm_to_int (scm_length (dash_details));
+ for (int i=0; i<num_segments; i++)
+ {
+ SCM dash_pattern = scm_list_ref (dash_details, scm_from_int (i));
+ Real t_min = robust_scm2double (scm_car (dash_pattern), 0);
+ Real t_max = robust_scm2double (scm_cadr (dash_pattern), 1.0);
+ Real dash_fraction =
+ robust_scm2double (scm_caddr (dash_pattern), 1.0);
+ Real dash_period =
+ robust_scm2double (scm_cadddr (dash_pattern), 0.75);
+ Bezier back_segment = back.extract (t_min, t_max);
+ Bezier curve_segment = curve.extract (t_min, t_max);
+ if (dash_fraction == 1.0)
+ return_value.add_stencil (bezier_sandwich (back_segment,
+ curve_segment,
+ linethick));
+ else
+ {
+ Bezier back_dash, curve_dash;
+ Real seg_length = (back_segment.control_[3] -
+ back_segment.control_[0]).length ();
+ int pattern_count = (int) (seg_length / dash_period);
+ Real pattern_length = 1.0 / (pattern_count + dash_fraction);
+ Real start_t, end_t;
+ for (int p = 0; p <= pattern_count; p++)
+ {
+ start_t = p * pattern_length;
+ end_t = (p + dash_fraction) * pattern_length;
+ back_dash =
+ back_segment.extract (start_t, end_t);
+ curve_dash =
+ curve_segment.extract (start_t, end_t);
+ return_value.add_stencil (bezier_sandwich (back_dash,
+ curve_dash,
+ linethick));
+ }
+ }
+ }
+ }
+ return return_value;