maia-util/es6/default_page_and_system_breaks.js

Utility math and music functions supporting various applications by Music Artificial Intelligence Algorithms, Inc.

export default function default_page_and_system_breaks(staff_and_clef_names, final_bar_no){
  // Tom Collins 1/3/2015.
  // In
  // staff_and_clef_names Array mandatory
  // final_bar_no Integer mandatory
  // Out Array
  // If the page_breaks and system_breaks variables are empty, this function
  // will populate them with default values based on the number of staves and
  // bars.

  var page_breaks = [];
  var system_breaks = [];
  var nos_staves = staff_and_clef_names.length;
  switch (nos_staves){
    case 1:
      var sbreak = 4;
      var pbreak = 10*sbreak;
      break;
    case 2:
      var sbreak = 4;
      var pbreak = 5*sbreak;
      break;
    case 3:
      var sbreak = 4;
      var pbreak = 3*sbreak;
      break;
    case 4:
      var sbreak = 4;
      var pbreak = 2*sbreak;
      break;
    case 5:
      var sbreak = 4;
      var pbreak = 2*sbreak;
      break;
    case 6:
      var sbreak = 4;
      var pbreak = 2*sbreak;
      break;
    default:
      var sbreak = 4;
      var pbreak = sbreak;
      break;
  }
  var curr_bar = sbreak;
  while (curr_bar < final_bar_no){
    if (curr_bar%pbreak == 0){
      page_breaks.push(curr_bar + 1);
    }
    else{
      system_breaks.push(curr_bar + 1);
    }
    curr_bar = curr_bar + sbreak;
  }
  return [page_breaks, system_breaks];
}