#!/usr/bin/env python

import math
import sys
import time

import scrollphat


print("""
Scroll pHAT - Sine Wave

Display a sine wave across the Scroll pHAT.

Press Ctrl+C to exit!
""")

i = 0
buf = [0] * 11
scrollphat.set_brightness(20)

while True:
    try:
        for x in range(0, 11):
            y = (math.sin((i + (x * 10)) / 10.0) + 1)  # Produces range from 0 to 2
            y *= 2.5                                   # Scale to 0 to 5
            buf[x] = 1 << int(y)

        scrollphat.set_buffer(buf)
        scrollphat.update()

        time.sleep(0.005)

        i += 1
    except KeyboardInterrupt:
        scrollphat.clear()
        sys.exit(-1)