Graph Calculation

Graph.js

function Graph(top_point, bottom_point) {
  const increments = [2.5, 5, 10];
  const difference = top_point - bottom_point
  const value = difference / 4;

  var selected_increment = 0;
  var iteration = 0
  var multiplier = 1;

  var gap = 0;
  var bottom_graph = 0;
  var top_graph = 0;

  while(selected_increment == 0) {
    increment = increments[iteration] * multiplier;

    if (value - increment < 0) {
      gap = increment * 4;
      bottom_graph = Math.floor(bottom_point / increment) * increment;
      top_graph = bottom_graph + gap;

      if (top_graph > top_point && bottom_graph < bottom_point) {
        selected_increment = increment;
        break;
      }
    }

    iteration = iteration + 1;

    if (iteration == increments.length) {
      iteration = 0;
      multiplier = multiplier * 10;
    }
  }

  console.log('The top and bottom point is [' + top_point + ', ' + bottom_point + ']');
  console.log('The point is [' + top_graph + ', ' + bottom_graph + ']');
  console.log('The increment is ' + selected_increment);
  console.log(' ');
}