X-Git-Url: https://git.donarmstrong.com/?a=blobdiff_plain;f=lily%2Fself-aligment-interface.cc;h=1459c8c817e347c71adfdaaab717ee6cd9b964b8;hb=5b4b0d6e9a197e8f9eb085b7c2ad78b8be3e5cfc;hp=870d077d6dc7c8b6cf91eb56dd55604a4b39ca40;hpb=08da6e274ea516076699e8e9bbdd48e5919cb526;p=lilypond.git diff --git a/lily/self-aligment-interface.cc b/lily/self-aligment-interface.cc index 870d077d6d..1459c8c817 100644 --- a/lily/self-aligment-interface.cc +++ b/lily/self-aligment-interface.cc @@ -1,123 +1,158 @@ +/* + self-alignment-interface.cc -- implement Self_alignment_interface + + source file of the GNU LilyPond music typesetter + + (c) 2004--2008 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) ly_scm2int (axis); - Grob *him = me->get_parent (a); - Interval he = him->extent (him,a); - - return scm_make_real (he.is_empty () ? 0.0 : he.center ()); + return aligned_on_self (unsmob_grob (element), Y_AXIS); } -MAKE_SCHEME_CALLBACK (Self_alignment_interface,aligned_on_parent,2); +MAKE_SCHEME_CALLBACK (Self_alignment_interface, x_aligned_on_self, 1); SCM -Self_alignment_interface::aligned_on_parent (SCM element_smob, SCM axis) +Self_alignment_interface::x_aligned_on_self (SCM element) { - Grob *me = unsmob_grob (element_smob); - Axis a = (Axis) ly_scm2int (axis); - Grob *him = me->get_parent (a); - 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 (!ly_c_number_p (align_prop)) - return scm_int2num (0); + return aligned_on_self (unsmob_grob (element), X_AXIS); +} - Real x = 0.0; +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"); - Real align = ly_scm2double (align_prop); - - Interval ext (me->extent (me,a)); - if (ext.is_empty ()) + SCM align (me->internal_get_property (sym)); + if (scm_is_number (align)) { - programming_error ("I'm empty. Can't align on self"); - + 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))); } - else - x -= ext.linear_combination (align) ; + return scm_from_double (0.0); +} - if (!he.is_empty ()) - { - x += he.linear_combination (align); - } - return scm_make_real (x); + +SCM +Self_alignment_interface::centered_on_object (Grob *him, Axis a) +{ + return scm_from_double (robust_relative_extent (him, him, a).center ()); } -/* - Position centered on parent. - */ -MAKE_SCHEME_CALLBACK (Self_alignment_interface,centered_on_other_axis_parent,2); + +MAKE_SCHEME_CALLBACK (Self_alignment_interface, centered_on_x_parent, 1); SCM -Self_alignment_interface::centered_on_other_axis_parent (SCM element_smob, - SCM axis) +Self_alignment_interface::centered_on_x_parent (SCM smob) { - Grob *me = unsmob_grob (element_smob); - Axis a = (Axis) ly_scm2int (axis); - Grob *him = me->get_parent (other_axis (a)); - Interval he = him->extent (him,a); - - return scm_make_real (he.is_empty () ? 0.0 : he.center ()); + 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 +MAKE_SCHEME_CALLBACK (Self_alignment_interface, x_centered_on_y_parent, 1); +SCM +Self_alignment_interface::x_centered_on_y_parent (SCM smob) +{ + return centered_on_object (unsmob_grob (smob)->get_parent (Y_AXIS), X_AXIS); +} - Requires that self-alignment-{X,Y} be set. - */ -MAKE_SCHEME_CALLBACK (Self_alignment_interface,aligned_on_self,2); +MAKE_SCHEME_CALLBACK (Self_alignment_interface, aligned_on_x_parent,1); SCM -Self_alignment_interface::aligned_on_self (SCM element_smob, SCM axis) +Self_alignment_interface::aligned_on_x_parent (SCM smob) { - Grob *me = unsmob_grob (element_smob); - Axis a = (Axis) ly_scm2int (axis); + return aligned_on_parent (unsmob_grob (smob), X_AXIS); +} - SCM sym= (a == X_AXIS) ? ly_symbol2scm ("self-alignment-X"): ly_symbol2scm ("self-alignment-Y"); - - SCM align (me->internal_get_property (sym)); - if (ly_c_number_p (align)) - { - Interval ext (me->extent (me,a)); +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); +} - if (ext.is_empty ()) - { - programming_error ("I'm empty. Can't align on self"); - return scm_make_real (0.0); - } - else - { - return scm_make_real (- ext.linear_combination (ly_scm2double (align))); - } - } - return scm_make_real (0.0); +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, "self-alignment-interface", - "Position this object on itself and/or on its parent. To this end, the following functions " - " are provided: \n" - "@table @code \n" - "@item Self_alignment_interface::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_parent\n" - "@item Self_alignment_interface::centered_on_parent\n" - " Shift the object so its own reference point is centered on the " - " extent of the parent \n" - "@item Self_alignment_interface::centered_on_other_axis_parent\n" - " For X-axis, center on the Y-parent, and vice versa.\n " - "@end table\n" - , - "self-alignment-X self-alignment-Y"); +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", + + /* properties */ + "self-alignment-X " + "self-alignment-Y " + );