docs: function mxArrow(points, fill, stroke, strokewidth, arrowWidth, spacing, endSize)
  {
  	mxShape.call(this);
  	this.points = points;
  	this.fill = fill;
  	this.stroke = stroke;
  	this.strokewidth = (strokewidth != null) ? strokewidth : 1;
  	this.arrowWidth = (arrowWidth != null) ? arrowWidth : mxConstants.ARROW_WIDTH;
  	this.spacing = (spacing != null) ? spacing : mxConstants.ARROW_SPACING;
  	this.endSize = (endSize != null) ? endSize : mxConstants.ARROW_SIZE;
  }