input/lsr/three-sided-box.ly

   1 %% Do not edit this file; it is auto-generated from LSR http://lsr.dsi.unimi.it
   2 %% This file is in the public domain.
   3 \version "2.12.0"
   4
   5 \header {
   6   lsrtags = "rhythms, text"
   7
   8   texidoc = "
   9 This example shows how to add a markup command to get a three sided box
  10 around some text (or other markup).
  11
  12 "
  13   doctitle = "Three-sided box"
  14 } % begin verbatim
  15
  16 % New command to add a three sided box, with sides north, west and south
  17 % Based on the box-stencil command defined in scm/stencil.scm
  18 % Note that you use ";" to comment a line in Scheme
  19 #(define-public (NWS-box-stencil stencil thickness padding)
  20   "Add a box around STENCIL, producing a new stencil."
  21   (let* ((x-ext (interval-widen (ly:stencil-extent stencil 0) padding))
  22          (y-ext (interval-widen (ly:stencil-extent stencil 1) padding))
  23          (y-rule (make-filled-box-stencil (cons 0 thickness) y-ext))
  24          (x-rule (make-filled-box-stencil
  25                   (interval-widen x-ext thickness) (cons 0 thickness))))
  26 ;    (set! stencil (ly:stencil-combine-at-edge stencil X 1 y-rule padding))
  27     (set! stencil (ly:stencil-combine-at-edge stencil X -1 y-rule padding))
  28     (set! stencil (ly:stencil-combine-at-edge stencil Y 1 x-rule 0.0))
  29     (set! stencil (ly:stencil-combine-at-edge stencil Y -1 x-rule 0.0))
  30     stencil))
  31
  32 % The corresponding markup command, based on the \box command defined
  33 % in scm/define-markup-commands.scm
  34 #(define-markup-command (NWS-box layout props arg) (markup?)
  35   "Draw a box round @var{arg}.  Looks at @code{thickness},
  36 @code{box-padding} and @code{font-size} properties to determine line
  37 thickness and padding around the markup."
  38
  39   (let* ((th (chain-assoc-get 'thickness props  0.1))
  40          (size (chain-assoc-get 'font-size props 0))
  41          (pad (* (magstep size)
  42                  (chain-assoc-get 'box-padding props 0.2)))
  43          (m (interpret-markup layout props arg)))
  44     (NWS-box-stencil m th pad)))
  45
  46
  47 % Test it:
  48
  49 \layout { ragged-right = ##f }
  50
  51 \relative c' {
  52   c2^\markup { \NWS-box ABCD }
  53   c^\markup { \NWS-box \note #"4" #1.0 }
  54 }