You can customize points by initializing the point colors. The customization options allow you to differentiate the
Negative points. This customization only applicable for line, column and area type Sparkline.
<ej-spark-line id="sparkline" negative-point-color="red" high-point-color="blue" low-point-color="orange" start-point-color="green" end-point-color="green"> </ej-spark-line>