docs: function(options){
  	this.dom = [];
  	this.fillColor='black';
  	this.strokeColor='black';
  	this.strokeWidth=1;
  	this.unit='mm';
  	this.width=100;
  	this.height=100;
  
  	for(var optionName in options){
  		this[optionName]=options[optionName];
  	}
  }