docs: function myOnresizebeforedraw (obj)
              {
                  var gutterLeft = obj.Get('chart.gutter.left');
                  var gutterRight = obj.Get('chart.gutter.right');
              
                  obj.Set('chart.hmargin', (obj.canvas.width - gutterLeft - gutterRight) / (obj.original_data[0].length * 2));
              }