luvium</p>
</div>
<p>If the mouse cursor is hovering over an empty region of the plot, nothing is returned by <code><a href="https://shiny.rstudio.com/reference/shiny/latest/renderText.html">renderText()</a></code> and so no tooltip text box is displayed.</p>
<div class="figure">
<img src="hover_empty_area.jpg" alt=""><p class="caption">screenshot of cursor over empty region</p>
</div>
<p>Let’s take a deeper dive into each part of the server function.</p>
<div id="drawing-plot-and-extracting-coordinates" 