add magtag example

examples/progressbar_magtag_simpletest.py

@@ -0,0 +1,63 @@
+"""
+Basic progressbar example script
+adapted for use on MagTag.
+"""
+import time
+import board
+import displayio
+import digitalio
+from adafruit_progressbar import ProgressBar
+
+# use built in display (PyPortal, PyGamer, PyBadge, CLUE, etc.)
+# see guide for setting up external displays (TFT / OLED breakouts, RGB matrices, etc.)
+# https://learn.adafruit.com/circuitpython-display-support-using-displayio/display-and-display-bus
+display = board.DISPLAY
+time.sleep(display.time_to_refresh)
+
+# a button will be used to advance the progress
+a_btn = digitalio.DigitalInOut(board.BUTTON_A)
+a_btn.direction = digitalio.Direction.INPUT
+a_btn.pull = digitalio.Pull.UP
+
+# Make the display context
+splash = displayio.Group(max_size=10)
+display.show(splash)
+
+# set progress bar width and height relative to board's display
+BAR_WIDTH = display.width - 40
+BAR_HEIGHT = 30
+
+x = display.width // 2 - BAR_WIDTH // 2
+y = display.height // 3
+
+# Create a new progress_bar object at (x, y)
+progress_bar = ProgressBar(
+    x, y, BAR_WIDTH, BAR_HEIGHT, 1.0, bar_color=0x666666, outline_color=0xFFFFFF
+)
+
+# Append progress_bar to the splash group
+splash.append(progress_bar)
+
+current_progress = (time.monotonic() % 101) / 100.0
+print(current_progress)
+progress_bar.progress = current_progress
+
+# refresh the display
+display.refresh()
+
+prev_a = a_btn.value
+while True:
+    cur_a = a_btn.value
+    # if a_btn was just pressed down
+    if not cur_a and prev_a:
+        current_progress += 0.20
+        if current_progress > 1.0:
+            current_progress = 0.0
+        print(current_progress)
+        progress_bar.progress = current_progress
+
+        time.sleep(display.time_to_refresh)
+        display.refresh()
+        time.sleep(display.time_to_refresh)
+
+    prev_a = cur_a