Merge pull request adafruit#1203 from firepixie/master

Ocean resin lightbox code

Author: TheKitty

Ocean_Resin_Lightbox/README.txt

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+# Ocean_Resin_Lightbox
+
+Code to accompany this tutorial:
+https://learn.adafruit.com/ocean-epoxy-resin-art-with-rgb-led-matrix-animations
+
+Ocean Epoxy Resin LightBox with RGB LED Matrix Animations
+Adafruit invests time and resources providing this open source code.
+Please support Adafruit and open source hardware by purchasing
+products from Adafruit!
+Written by Jeff Epler, Erin St Blaine & Limor Fried for Adafruit Industries
+Copyright (c) 2020 Adafruit Industries
+Licensed under the MIT license.
+All text above must be included in any redistribution.

Ocean_Resin_Lightbox/code.py

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+"""
+RGB Matrix Ocean Scroller
+Adafruit invests time and resources providing this open source code.
+Please support Adafruit and open source hardware by purchasing
+products from Adafruit!
+Written by Jeff Epler & Limor Fried for Adafruit Industries
+Copyright (c) 2019-2020 Adafruit Industries
+Licensed under the MIT license.
+All text above must be included in any redistribution.
+"""
+
+import math
+import time
+import random
+
+import adafruit_imageload.bmp
+import board
+import displayio
+import framebufferio
+import rgbmatrix
+import ulab
+
+displayio.release_displays()
+
+class Reshader:
+    '''reshader fades the image to mimic brightness control'''
+    def __init__(self, palette):
+        self.palette = palette
+        ulab_palette = ulab.zeros((len(palette), 3))
+        for i in range(len(palette)):
+            rgb = int(palette[i])
+            ulab_palette[i, 2] = rgb & 0xff
+            ulab_palette[i, 1] = (rgb >> 8) & 0xff
+            ulab_palette[i, 0] = rgb >> 16
+        self.ulab_palette = ulab_palette
+
+    def reshade(self, brightness):
+        '''reshader'''
+        palette = self.palette
+        shaded = ulab.array(self.ulab_palette * brightness, dtype=ulab.uint8)
+        for i in range(len(palette)):
+            palette[i] = tuple(shaded[i])
+
+def do_crawl_down(image_file, *,
+                  speed=12, weave=4, pulse=.5,
+                  weave_speed=1/6, pulse_speed=1/7):
+    # pylint:disable=too-many-locals
+    '''function to scroll the image'''
+    the_bitmap, the_palette = adafruit_imageload.load(
+        image_file,
+        bitmap=displayio.Bitmap,
+        palette=displayio.Palette)
+
+    shader = Reshader(the_palette)
+
+    group = displayio.Group()
+    tile_grid = displayio.TileGrid(bitmap=the_bitmap, pixel_shader=the_palette)
+    group.append(tile_grid)
+    display.show(group)
+
+    start_time = time.monotonic_ns()
+    start_y = display.height   # High enough to be "off the top"
+    end_y = -the_bitmap.height     # Low enough to be "off the bottom"
+
+    # Mix up how the bobs and brightness change on each run
+    r1 = random.random() * math.pi
+    r2 = random.random() * math.pi
+
+    y = start_y
+    while y > end_y:
+        now = time.monotonic_ns()
+        y = start_y - speed * ((now - start_time) / 1e9)
+        group.y = round(y)
+
+        # wave from side to side
+        group.x = round(weave * math.cos(y * weave_speed + r1))
+
+        # Change the brightness
+        if pulse > 0:
+            shader.reshade((1 - pulse) + pulse * math.sin(y * pulse_speed + r2))
+
+        display.refresh(minimum_frames_per_second=0, target_frames_per_second=60)
+
+def do_pulse(image_file, *, duration=4, pulse_speed=1/8, pulse=.5):
+    '''pulse animation'''
+    the_bitmap, the_palette = adafruit_imageload.load(
+        image_file,
+        bitmap=displayio.Bitmap,
+        palette=displayio.Palette)
+
+    shader = Reshader(the_palette)
+
+    group = displayio.Group()
+    tile_grid = displayio.TileGrid(bitmap=the_bitmap, pixel_shader=the_palette)
+    group.append(tile_grid)
+    group.x = (display.width - the_bitmap.width) // 2
+    group.y = (display.height - the_bitmap.height) // 2
+    display.show(group)
+
+    start_time = time.monotonic_ns()
+    end_time = start_time + int(duration * 1e9)
+
+    now_ns = time.monotonic_ns()
+    while now_ns < end_time:
+        now_ns = time.monotonic_ns()
+        current_time = (now_ns - start_time) / 1e9
+
+        shader.reshade((1 - pulse) - pulse
+                       * math.cos(2*math.pi*current_time*pulse_speed)**2)
+
+        display.refresh(minimum_frames_per_second=0, target_frames_per_second=60)
+
+matrix = rgbmatrix.RGBMatrix(
+    width=64, height=32, bit_depth=5,
+    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)
+
+# Image playlist - set to run randomly. Set pulse from 0 to .5
+while True:
+    show_next = random.randint(1, 5) #change to reflect how many images you add
+    if show_next == 1:
+        do_crawl_down("/ray.bmp")
+    elif show_next == 2:
+        do_crawl_down("/waves1.bmp", speed=7, weave=0, pulse=.35)
+    elif show_next == 3:
+        do_crawl_down("/waves2.bmp", speed=9, weave=0, pulse=.35)
+    elif show_next == 4:
+        do_pulse("/heart.bmp", duration=4, pulse=.45)
+    elif show_next == 5:
+        do_crawl_down("/dark.bmp")