title: How to change shape of elements in the legend - jFreeChart?
body: <p>How I can change the shape of elements of legend for jFreeChart without changing the graphs of diagrams ? </p>
  
  <p><img src="https://i.stack.imgur.com/oVWEX.png" alt="enter image description here"></p>
  
  <p>I have ready time series diagram. I need to update the existed data markers in legend to the simple line with defined colors.</p>