CircuitPython_RGBMatrix: add simple_scroller example

Author: jepler

CircuitPython_RGBMatrix/simple_scroller.py

@@ -0,0 +1,56 @@
+# This example implements a simple two line scroller using
+# Adafruit_CircuitPython_Display_Text.  Each line has its own color
+# and it is possible to modify the example to use other fonts and non-standard
+# characters.
+
+import array
+
+from _pixelbuf import wheel
+import adafruit_display_text.label
+import board
+import displayio
+import framebufferio
+import rgbmatrix
+import terminalio
+displayio.release_displays()
+
+matrix = rgbmatrix.RGBMatrix(
+    width=64, height=32, bit_depth=1,
+    rgb_pins=[board.D6, board.D5, board.D9, board.D11, board.D10, board.D12],
+    addr_pins=[board.A5, board.A4, board.A3, board.A2],
+    clock_pin=board.D13, latch_pin=board.D0, output_enable_pin=board.D1)
+display = framebufferio.FramebufferDisplay(matrix, auto_refresh=False)
+
+line1 = adafruit_display_text.label.Label(
+    terminalio.FONT,
+    color=0xff0000,
+    text="This scroller is brought to you by CircuitPython RGBMatrix")
+line1.x = display.width
+line1.y = 8
+
+line2 = adafruit_display_text.label.Label(
+    terminalio.FONT,
+    color=0x0080ff,
+    text="Hello to all CircuitPython contributors worldwide <3")
+line2.x = display.width
+line2.y = 24
+
+g = displayio.Group(max_size=2)
+g.append(line1)
+g.append(line2)
+display.show(g)
+
+# Scoot one label a pixel to the left; send it back to the far right
+# if it's gone all the way off screen
+def scroll(line):
+    line.x = line.x - 1
+    line_width = line.bounding_box[2]
+    if line.x < -line_width:
+        line.x = display.width
+
+# You can add more effects in this loop.  For instance, maybe you want to set the
+# color of each label to a different value
+while True:
+    scroll(line1)
+    scroll(line2)
+    display.refresh(minimum_frames_per_second=0)