title: same scale on x y axis in highchart
body: <p>I am trying to plot a trajectory using Javascript and highcharts, similarly to this minimal example:</p>
  
  <pre><code>$(function () { 
  
    $('#container').highcharts({
      chart: {
          type: 'line'
      },
  
      title: {
          text: 'PLOT'
      },
  
      xAxis: {
          title: {
              text: 'X'
          },
      },
  
      yAxis: {
          title: {
              text: 'Y'
          },
      },
  
      series: [{
          name: 'Trajectory',
          data: [[1,2],[5,0],[0,0],[3,4]]
      }]
    });
  });
  </code></pre>
  
  <p>( <a href="http://jsfiddle.net/LLExL/3614/" rel="nofollow noreferrer">http://jsfiddle.net/LLExL/3614/</a> )</p>
  
  <p>Since the unit for the values on x and y is meters, I would like to scale equally both the axis, otherwise my trajectory will end up being highly distorted (if you're familiar with Matlab, I want to reach the same result as in the 'axis equal' option for the standard matlab 'plot' function:
  <img src="https://i.stack.imgur.com/aB9sh.png" alt="">
  )</p>
  
  <p>Do you have any ideas on how I can achieve the same result in highcharts?
  Thank you !</p>