As explained on the page ( https://learn.adafruit.com/adafruit-dotstar-leds?view=all ), the Strip is connected to an Arduino (or Rasberry)
You program the Arduino to do its job.
You can’t do this via processing but the Arduino IDE is derived from the processing IDE
Check out https://www.arduino.cc/en/software
Then on the initial page there is a lib you have to install etc., read the page
for py: see Overview | Adafruit DotStar LEDs | Adafruit Learning System