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‎examples/palettefader_simpletest.py‎

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# SPDX-FileCopyrightText: 2017 Scott Shawcroft, written for Adafruit Industries
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# SPDX-FileCopyrightText: Copyright (c) 2022 JG for Cedar Grove Maker Studios
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# SPDX-FileCopyrightText: 2022-09-06 JG for Cedar Grove Maker Studios
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# SPDX-License-Identifier: MIT
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#
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# SPDX-License-Identifier: Unlicense
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# palettefader_simpletest.py
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"""
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This is a PaletteFader class example for an Adafruit MatrixPortal with a
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32x64 RGB LED display panel. Two text labels, a displayio shape, a vectorio
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shape, and an icon spritesheet tile are placed on the display in a layer over a
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background image. The Matrix Portal's analog voltage input on pin A0 controls
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the foreground layer brightness over the fixed-brightness background image.
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"""
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import time
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import random
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import board
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from analogio import AnalogIn
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import displayio
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import vectorio
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import terminalio
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from simpleio import map_range
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from adafruit_matrixportal.matrix import Matrix
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from adafruit_display_text.label import Label
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from adafruit_display_shapes.rect import Rect
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# from adafruit_display_shapes.circle import Circle
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import adafruit_imageload
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from cedargrove_palettefader import PaletteFader
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# fmt: off
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# Define a few colors
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YELLOW = 0xFFFF00 # temperature
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AQUA = 0x00FFFF # humidity
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FUCHSIA = 0xFF00FF # watchdog
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# Define icon graphic object parameters
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ICON_SPRITESHEET_FILE = "weather-icons.bmp"
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ICON_SPRITE_WIDTH = 16
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ICON_SPRITE_HEIGHT = 16
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ICON_SPRITE = 0 # Select a tile from the spritesheet
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# Define background graphic object parameters
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BKG_BRIGHTNESS = 0.2 # Initial brightness level
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BKG_GAMMA = 0.65 # Works nicely for brightness = 0.2
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BKG_IMAGE_FILE = "background.bmp"
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# Instantiate fader potentiometer
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ANALOG_FADER = True # True to enable; False to disable
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fader = AnalogIn(board.A0)
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# Instantiate RGB LED matrix display panel
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DISPLAY_BRIGHTNESS = 0.3 # Initial brightness level
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DISPLAY_BIT_DEPTH = 6 # Default is 2-bits; maximum of 6-bits
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display = Matrix(bit_depth=DISPLAY_BIT_DEPTH).display
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display.rotation = 270 # Portrait orientation; MatrixPortal board on bottom
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DISPLAY_CENTER = (display.width // 2, display.height // 2)
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# fmt: on
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# Define the primary and foreground display groups
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primary_group = displayio.Group()
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fg_group = displayio.Group()
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# Load the background image and source color palette
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bkg_bitmap, bkg_palette_source = adafruit_imageload.load(
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BKG_IMAGE_FILE, bitmap=displayio.Bitmap, palette=displayio.Palette
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)
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# Instantiate background PaletteFader object and display on-screen
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bkg_faded = PaletteFader(bkg_palette_source, BKG_BRIGHTNESS, BKG_GAMMA, normalize=True)
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bkg_tile = displayio.TileGrid(bkg_bitmap, pixel_shader=bkg_faded.palette)
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primary_group.append(bkg_tile)
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display.show(primary_group)
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# Load the icon spritesheet and source palette
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icon_spritesheet, icon_palette_source = adafruit_imageload.load(
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ICON_SPRITESHEET_FILE, bitmap=displayio.Bitmap, palette=displayio.Palette
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)
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# Set transparency for icon source palette index 0
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icon_palette_source.make_transparent(0)
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# Instantiate the icon TileGrid and place it on the display
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icon_tile = displayio.TileGrid(
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icon_spritesheet,
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pixel_shader=icon_palette_source,
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tile_width=ICON_SPRITE_WIDTH,
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tile_height=ICON_SPRITE_HEIGHT,
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)
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icon_tile.x = DISPLAY_CENTER[0] - 8
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icon_tile.y = 22
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fg_group.append(icon_tile)
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# Place a displayio display_shapes rectangle in the upper left corner
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watchdog = Rect(0, 0, 5, 5, fill=FUCHSIA, outline=AQUA, stroke=1)
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fg_group.append(watchdog)
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# Define the text labels. Add an attribute for the group items palette.
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temperature = Label(terminalio.FONT)
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temperature.anchor_point = (0.5, 0.5)
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temperature.anchored_position = (DISPLAY_CENTER[0], 14)
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temperature.color = YELLOW
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fg_group.append(temperature)
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humidity = Label(terminalio.FONT)
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humidity.anchor_point = (0.5, 0.5)
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humidity.anchored_position = (DISPLAY_CENTER[0], 45)
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humidity.color = AQUA
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fg_group.append(humidity)
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# Place a vectorio circle in the upper right corner
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sun_palette = displayio.Palette(1)
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sun_palette[0] = YELLOW
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sun = vectorio.Circle(pixel_shader=sun_palette, radius=8, x=30, y=0)
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fg_group.append(sun)
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# pylint: disable=protected-access
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# Create foreground group color list from ._palette and .pixel_shader contents
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fg_colors_source = []
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for i, group_object in enumerate(fg_group):
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if hasattr(group_object, "_palette"):
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# It's a displayio display_shapes or label object
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for j, color in enumerate(group_object._palette):
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fg_colors_source.append(color)
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elif hasattr(group_object, "pixel_shader"):
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# It's a bitmap or vectorio object
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for j, color in enumerate(group_object.pixel_shader):
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fg_colors_source.append(color)
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primary_group.append(fg_group)
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# Instantiate foreground color list PaletteFader object
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fg_colors = PaletteFader(fg_colors_source, DISPLAY_BRIGHTNESS, normalize=False)
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# ### Primary code loop starts here ###
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# Reset the information and fader refresh timers; None for initial run
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info_refresh_timer = None
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fader_refresh_timer = None
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while True:
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# Update the on-screen information every 10 seconds and on initial run
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if (not info_refresh_timer) or (time.monotonic() - info_refresh_timer) > 10:
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# Get a random temperature and humidity value
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current_temperature = random.randrange(500, 1000) / 10
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temperature.text = f"{current_temperature:.0f}°"
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current_humidity = random.randrange(200, 900) / 10
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humidity.text = f"{current_humidity:.0f}%"
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icon_tile[0] = random.randrange(0, 17)
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info_refresh_timer = time.monotonic()
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# Update brightness fader values every 0.1 second and on initial run
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if (not fader_refresh_timer) or (time.monotonic() - fader_refresh_timer) > 0.1:
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if ANALOG_FADER:
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# Read the potentiometer and calculate a new brightness value
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DISPLAY_BRIGHTNESS = int(map_range(fader.value, 300, 54000, 5, 100)) / 100
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# Update foreground group ._palette and .pixel_shader contents
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fg_colors.brightness = DISPLAY_BRIGHTNESS
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fg_colors_index = 0
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for i, _ in enumerate(fg_group):
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if hasattr(fg_group[i], "_palette"):
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# For a displayio display_shapes or label object
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for j, _ in enumerate(fg_group[i]._palette):
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fg_group[i]._palette[j] = fg_colors.palette[fg_colors_index]
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fg_colors_index += 1
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elif hasattr(fg_group[i], "pixel_shader"):
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# For a bitmap or vectorio object
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for j, _ in enumerate(fg_group[i].pixel_shader):
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fg_group[i].pixel_shader[j] = fg_colors.palette[fg_colors_index]
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fg_colors_index += 1
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fader_refresh_timer = time.monotonic()

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