void drawEdge(float x0, float y0, float x1, float y1,int interp,float weight){
    	  int alpha = (int)(interp*0.5); //Scale down the transparency    	  
    	  parent.strokeWeight(weight);     	 
    	  parent.stroke(edgeColour.getRed(), edgeColour.getGreen(), edgeColour.getBlue(),alpha); 
		  parent.line(x0, y0,x1,y1);		  
      }