code: function(from, to, styles, ctx){
  
              var x = from.x
                  ,y = from.y
                  ;
  
              ctx = ctx || this.ctx;
  
              ctx.beginPath();
              this.setStyle( styles, ctx );
  
              ctx.moveTo(x, y);
  
              x = to.x;
              y = to.y;
  
              ctx.lineTo(x, y);
  
              ctx.stroke();
              ctx.fill();
          }
docs: CanvasRenderer#drawLine( from, to, styles[, ctx] )
  - from (Vectorish): The starting pt
  - to (Vectorish): The ending pt
  - styles (Object): The styles configuration
  - ctx (Canvas2DContext): The canvas context
  
  Draw a line onto specified canvas context.