220 lines
7.8 KiB
Python
220 lines
7.8 KiB
Python
#!/usr/bin/python3
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# -*- coding: utf-8 -*-
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"""
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Inkycal ePaper driving functions
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Copyright by aceisace
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"""
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from importlib import import_module
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from PIL import Image
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from inkycal.custom import top_level
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import glob
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class Display:
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"""Display class for inkycal
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Creates an instance of the driver for the selected E-Paper model and allows
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rendering images and calibrating the E-Paper display
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args:
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- epaper_model: The name of your E-Paper model.
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"""
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def __init__(self, epaper_model):
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"""Load the drivers for this epaper model"""
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if 'colour' in epaper_model:
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self.supports_colour = True
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else:
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self.supports_colour = False
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try:
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driver_path = f'inkycal.display.drivers.{epaper_model}'
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driver = import_module(driver_path)
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self._epaper = driver.EPD()
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self.model_name = epaper_model
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except ImportError:
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raise Exception('This module is not supported. Check your spellings?')
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except FileNotFoundError:
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raise Exception('SPI could not be found. Please check if SPI is enabled')
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def render(self, im_black, im_colour=None):
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"""Renders an image on the selected E-Paper display.
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Initlializes the E-Paper display, sends image data and executes command
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to update the display.
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Args:
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- im_black: The image for the black-pixels. Anything in this image that is
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black is rendered as black on the display. This is required and ideally
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should be a black-white image.
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- im_colour: For E-Paper displays supporting colour, a separate image,
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ideally black-white is required for the coloured pixels. Anything that is
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black in this image will show up as either red/yellow.
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Rendering an image for black-white E-Paper displays:
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>>> sample_image = PIL.Image.open('path/to/file.png')
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>>> display = Display('my_black_white_display')
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>>> display.render(sample_image)
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Rendering black-white on coloured E-Paper displays:
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>>> sample_image = PIL.Image.open('path/to/file.png')
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>>> display = Display('my_coloured_display')
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>>> display.render(sample_image, sample_image)
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Rendering coloured image where 2 images are available:
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>>> black_image = PIL.Image.open('path/to/file.png') # black pixels
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>>> colour_image = PIL.Image.open('path/to/file.png') # coloured pixels
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>>> display = Display('my_coloured_display')
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>>> display.render(black_image, colour_image)
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"""
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epaper = self._epaper
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if not self.supports_colour:
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print('Initialising..', end='')
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epaper.init()
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print('Updating display......', end='')
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epaper.display(epaper.getbuffer(im_black))
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print('Done')
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elif self.supports_colour:
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if not im_colour:
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raise Exception('im_colour is required for coloured epaper displays')
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print('Initialising..', end='')
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epaper.init()
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print('Updating display......', end='')
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epaper.display(epaper.getbuffer(im_black), epaper.getbuffer(im_colour))
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print('Done')
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print('Sending E-Paper to deep sleep...', end='')
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epaper.sleep()
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print('Done')
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def calibrate(self, cycles=3):
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"""Calibrates the display to retain crisp colours
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Flushes the selected display several times with it's supported colours,
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removing any previous effects of ghosting.
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Args:
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- cycles: -> int. The number of times to flush the display with it's
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supported colours.
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It's recommended to calibrate the display after every 6 display updates
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for best results. For black-white only displays, calibration is less
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critical, but not calibrating regularly results in grey-ish text.
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Please note that calibration takes a while to complete. 3 cycles may
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take 10 minutes on black-white E-Papers while it takes 20 minutes on coloured
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E-Paper displays.
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"""
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epaper = self._epaper
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epaper.init()
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display_size = self.get_display_size(self.model_name)
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white = Image.new('1', display_size, 'white')
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black = Image.new('1', display_size, 'black')
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print('----------Started calibration of ePaper display----------')
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if self.supports_colour:
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for _ in range(cycles):
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print('Calibrating...', end=' ')
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print('black...', end=' ')
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epaper.display(epaper.getbuffer(black), epaper.getbuffer(white))
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print('colour...', end=' ')
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epaper.display(epaper.getbuffer(white), epaper.getbuffer(black))
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print('white...')
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epaper.display(epaper.getbuffer(white), epaper.getbuffer(white))
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print(f'Cycle {_ + 1} of {cycles} complete')
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if not self.supports_colour:
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for _ in range(cycles):
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print('Calibrating...', end=' ')
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print('black...', end=' ')
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epaper.display(epaper.getbuffer(black))
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print('white...')
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epaper.display(epaper.getbuffer(white)),
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print(f'Cycle {_ + 1} of {cycles} complete')
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print('-----------Calibration complete----------')
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epaper.sleep()
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@classmethod
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def get_display_size(cls, model_name):
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"""Returns the size of the display as a tuple -> (width, height)
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Looks inside "drivers" folder for the given model name, then returns it's
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size.
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Args:
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- model_name: str -> The name of the E-Paper display to get it's size.
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Returns:
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(width, height) ->tuple, showing the size of the display
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You can use this function directly without creating the Display class:
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>>> Display.get_display_size('model_name')
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"""
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if not isinstance(model_name, str):
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print('model_name should be a string')
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return
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else:
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driver_files = top_level + '/inkycal/display/drivers/*.py'
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drivers = glob.glob(driver_files)
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drivers = [i.split('/')[-1].split('.')[0] for i in drivers]
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drivers.remove('__init__')
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drivers.remove('epdconfig')
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if model_name not in drivers:
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print('This model name was not found. Please double check your spellings')
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return
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else:
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with open(top_level + '/inkycal/display/drivers/' + model_name + '.py') as file:
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for line in file:
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if 'EPD_WIDTH=' in line.replace(" ", ""):
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width = int(line.rstrip().replace(" ", "").split('=')[-1])
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if 'EPD_HEIGHT=' in line.replace(" ", ""):
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height = int(line.rstrip().replace(" ", "").split('=')[-1])
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return width, height
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@classmethod
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def get_display_names(cls):
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"""Prints all supported E-Paper models.
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Fetches all filenames in driver folder and prints them on the console.
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Returns:
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Printed version of all supported Displays.
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Use one of the models to intilialize the Display class in order to gain
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access to the E-Paper.
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You can use this function directly without creating the Display class:
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>>> Display.get_display_names()
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"""
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driver_files = top_level + '/inkycal/display/drivers/*.py'
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drivers = glob.glob(driver_files)
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drivers = [i.split('/')[-1].split('.')[0] for i in drivers]
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drivers.remove('__init__')
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drivers.remove('epdconfig')
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print(*drivers, sep='\n')
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if __name__ == '__main__':
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print("Running Display class in standalone mode")
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