void drawNodeLabel(int alpha){    	  
    	  PFont font = parent.createFont("Century Gothic",12,true);
	   	  parent.textFont(font);	   	  
	   	  parent.fill(nodeLabelColour.getRed(),nodeLabelColour.getGreen(),nodeLabelColour.getBlue(),alpha);
	   	  parent.textAlign(parent.CENTER);
	   	  parent.text(this.label, this.x,this.y+4); 
      }