Adding rainbow key demo.

examples/macropad_rainbow_keys.py

@@ -0,0 +1,57 @@
+# SPDX-FileCopyrightText: Copyright (c) 2021 Kattni Rembor for Adafruit Industries
+#
+# SPDX-License-Identifier: Unlicense
+"""
+Rainbow LED grid layout demo for MacroPad. Displays the key pressed in a grid matching the key
+layout on the built-in display, and animates a rainbow the first time you press a key and turns it
+off on the next press.
+"""
+import displayio
+import terminalio
+from adafruit_display_text import bitmap_label as label
+from adafruit_displayio_layout.layouts.grid_layout import GridLayout
+from adafruit_macropad import MacroPad
+from rainbowio import colorwheel
+
+macropad = MacroPad()
+
+main_group = displayio.Group()
+macropad.display.show(main_group)
+title = label.Label(
+    y=4,
+    font=terminalio.FONT,
+    color=0x0,
+    text="      KEYPRESSES      ",
+    background_color=0xFFFFFF,
+)
+layout = GridLayout(x=0, y=10, width=128, height=54, grid_size=(3, 4), cell_padding=5)
+labels = []
+for _ in range(12):
+    labels.append(label.Label(terminalio.FONT, text=""))
+
+for index in range(12):
+    x = index % 3
+    y = index // 3
+    layout.add_content(labels[index], grid_position=(x, y), cell_size=(1, 1))
+
+main_group.append(title)
+main_group.append(layout)
+
+lit_keys = [False] * 12
+wheel_offset = 0
+while True:
+    key_event = macropad.keys.events.get()
+    if key_event:
+        if key_event.pressed:
+            labels[key_event.key_number].text = "KEY{}".format(key_event.key_number)
+            # Turn the LED on with the first press, and off with the second press.
+            lit_keys[key_event.key_number] = not lit_keys[key_event.key_number]
+        else:
+            labels[key_event.key_number].text = ""
+
+    wheel_offset += 1  # Glow thru the colorwheel.
+    for pixel in range(12):
+        if lit_keys[pixel]:  # Animate the specific LED.
+            macropad.pixels[pixel] = colorwheel((pixel / 12 * 256) + wheel_offset)
+        else:
+            macropad.pixels[pixel] = 0  # Otherwise, turn the LED off.