title: How to create a heatmap where each cell is divided into 4 triangles?
body: <p>I would like to divide one cell into one separate heatmap/with multiple color codes.</p>
  <p>Each square is divided into 4 triangles and each triangle has its own numerical value/color code.
  <a href="https://i.stack.imgur.com/rk4WY.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/rk4WY.png" alt="You can see an example here." /></a></p>