X-Git-Url: https://git.donarmstrong.com/?a=blobdiff_plain;f=lily%2Fself-aligment-interface.cc;h=66e71f0497083a98348dfe50e96ee7fefeec95f3;hb=96e14d746b102f223acf6b6f4cdb8b0f0a11cd24;hp=ff47fb92f36d70f554bbbfce3bc0bc3edd0887ce;hpb=0d239922fe322428efabd1fb20c8a54c2a6bacfb;p=lilypond.git diff --git a/lily/self-aligment-interface.cc b/lily/self-aligment-interface.cc index ff47fb92f3..66e71f0497 100644 --- a/lily/self-aligment-interface.cc +++ b/lily/self-aligment-interface.cc @@ -1,85 +1,158 @@ +/* + self-alignment-interface.cc -- implement Self_alignment_interface + + source file of the GNU LilyPond music typesetter + + (c) 2004--2007 Han-Wen Nienhuys +*/ + #include "self-alignment-interface.hh" + #include "warn.hh" +#include "paper-column.hh" +#include "grob.hh" -/* - Position centered on parent. - */ -MAKE_SCHEME_CALLBACK (Self_alignment_interface,centered_on_parent,2); +MAKE_SCHEME_CALLBACK (Self_alignment_interface, y_aligned_on_self, 1); SCM -Self_alignment_interface::centered_on_parent (SCM element_smob, SCM axis) +Self_alignment_interface::y_aligned_on_self (SCM element) { - Grob *me = unsmob_grob (element_smob); - Axis a = (Axis) gh_scm2int (axis); - Grob *him = me->get_parent (a); - Interval he = him->extent (him,a); - - return gh_double2scm (he.empty_b () ? 0.0 : he.center ()); + return aligned_on_self (unsmob_grob (element), Y_AXIS); +} + +MAKE_SCHEME_CALLBACK (Self_alignment_interface, x_aligned_on_self, 1); +SCM +Self_alignment_interface::x_aligned_on_self (SCM element) +{ + return aligned_on_self (unsmob_grob (element), X_AXIS); +} + +SCM +Self_alignment_interface::aligned_on_self (Grob *me, Axis a) +{ + SCM sym = (a == X_AXIS) ? ly_symbol2scm ("self-alignment-X") + : ly_symbol2scm ("self-alignment-Y"); + + SCM align (me->internal_get_property (sym)); + if (scm_is_number (align)) + { + Interval ext (me->extent (me, a)); + if (ext.is_empty ()) + programming_error ("cannot align on self: empty element"); + else + return scm_from_double (- ext.linear_combination (scm_to_double (align))); + } + return scm_from_double (0.0); } -/* - Position centered on parent. - */ -MAKE_SCHEME_CALLBACK (Self_alignment_interface,centered_on_other_axis_parent,2); SCM -Self_alignment_interface::centered_on_other_axis_parent (SCM element_smob, - SCM axis) +Self_alignment_interface::centered_on_object (Grob *him, Axis a) { - Grob *me = unsmob_grob (element_smob); - Axis a = (Axis) gh_scm2int (axis); - Grob *him = me->get_parent (other_axis (a)); - Interval he = him->extent (him,a); - - return gh_double2scm (he.empty_b () ? 0.0 : he.center ()); + return scm_from_double (robust_relative_extent (him, him, a).center ()); } +MAKE_SCHEME_CALLBACK (Self_alignment_interface, centered_on_x_parent, 1); +SCM +Self_alignment_interface::centered_on_x_parent (SCM smob) +{ + return centered_on_object (unsmob_grob (smob)->get_parent (X_AXIS), X_AXIS); +} + +MAKE_SCHEME_CALLBACK (Self_alignment_interface, centered_on_y_parent, 1); +SCM +Self_alignment_interface::centered_on_y_parent (SCM smob) +{ + return centered_on_object (unsmob_grob (smob)->get_parent (Y_AXIS), Y_AXIS); +} -/** - callback that centers the element on itself - Requires that self-alignment-{X,Y} be set. - */ -MAKE_SCHEME_CALLBACK (Self_alignment_interface,aligned_on_self,2); +MAKE_SCHEME_CALLBACK (Self_alignment_interface, x_centered_on_y_parent, 1); SCM -Self_alignment_interface::aligned_on_self (SCM element_smob, SCM axis) +Self_alignment_interface::x_centered_on_y_parent (SCM smob) { - Grob *me = unsmob_grob (element_smob); - Axis a = (Axis) gh_scm2int (axis); - static SCM prop_syms[2]; + return centered_on_object (unsmob_grob (smob)->get_parent (Y_AXIS), X_AXIS); +} - if (!prop_syms[0]) - { - prop_syms[X_AXIS] = ly_symbol2scm ("self-alignment-X"); - prop_syms[Y_AXIS] = ly_symbol2scm ("self-alignment-Y"); - } - - SCM align (me->internal_get_grob_property (prop_syms[a])); - if (gh_number_p (align)) - { - Interval ext (me->extent (me,a)); +MAKE_SCHEME_CALLBACK (Self_alignment_interface, aligned_on_x_parent,1); +SCM +Self_alignment_interface::aligned_on_x_parent (SCM smob) +{ + return aligned_on_parent (unsmob_grob (smob), X_AXIS); +} - if (ext.empty_b ()) - { - programming_error ("I'm empty. Can't align on self"); - return gh_double2scm (0.0); - } - else - { - return gh_double2scm (- ext.linear_combination (gh_scm2double (align))); - } - } - else if (unsmob_grob (align)) - { - return gh_double2scm (- unsmob_grob (align)->relative_coordinate (me, a)); - } - return gh_double2scm (0.0); +MAKE_SCHEME_CALLBACK (Self_alignment_interface, aligned_on_y_parent,1); +SCM +Self_alignment_interface::aligned_on_y_parent (SCM smob) +{ + return aligned_on_parent (unsmob_grob (smob), Y_AXIS); +} + +SCM +Self_alignment_interface::aligned_on_parent (Grob *me, Axis a) +{ + Grob *him = me->get_parent (a); + if (Paper_column::has_interface (him)) + return scm_from_double (0.0); + + Interval he = him->extent (him, a); + + SCM sym = (a == X_AXIS) ? ly_symbol2scm ("self-alignment-X") + : ly_symbol2scm ("self-alignment-Y"); + SCM align_prop (me->internal_get_property (sym)); + + if (!scm_is_number (align_prop)) + return scm_from_int (0); + + Real x = 0.0; + Real align = scm_to_double (align_prop); + + Interval ext (me->extent (me, a)); + if (ext.is_empty ()) + programming_error ("cannot align on self: empty element"); + else + x -= ext.linear_combination (align); + + if (!he.is_empty ()) + x += he.linear_combination (align); + + return scm_from_double (x); +} + +void +Self_alignment_interface::set_center_parent (Grob *me, Axis a) +{ + add_offset_callback (me, + (a==X_AXIS) ? centered_on_x_parent_proc : centered_on_y_parent_proc, + a); +} + +void +Self_alignment_interface::set_align_self (Grob *me, Axis a) +{ + add_offset_callback (me, + (a==X_AXIS) ? x_aligned_on_self_proc : y_aligned_on_self_proc, + a); } +ADD_INTERFACE (Self_alignment_interface, + "Position this object on itself and/or on its parent. To this" + " end, the following functions are provided:\n" + "\n" + "@table @code\n" + "@item Self_alignment_interface::[xy]_aligned_on_self\n" + "Align self on reference point, using" + " @code{self-alignment-X} and @code{self-alignment-Y}." + "@item Self_alignment_interface::aligned_on_[xy]_parent\n" + "@item Self_alignment_interface::centered_on_[xy]_parent\n" + "Shift the object so its own reference point is centered on" + " the extent of the parent\n" + "@end table\n", -ADD_INTERFACE (Self_alignment_interface, "self-alignment-interface", - "Position self using some alignment", - "self-alignment-X self-alignment-Y"); + /* properties */ + "self-alignment-X " + "self-alignment-Y " + );