Just felt like messing around with the Bitmap class. I had to make something like this for another job but I didn't know about
BitmapData and had to use
lineTo, what a pain in the ass it was to try to get splines to act like pixels. The Bitmap class is muh buddy now.
The buttons on the side will display different heart rate speeds, you can also turn the beep on or off. And you can squish or stretch the line with the controls at the bottom.