315 lines
10 KiB
Python
315 lines
10 KiB
Python
#!/usr/bin/python3
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# -*- coding: utf-8 -*-
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"""
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Inky-Calendar custom-functions for ease-of-use
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Copyright by aceisace
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"""
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import logging
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from PIL import Image, ImageDraw, ImageFont, ImageColor
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from urllib.request import urlopen
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import os
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import time
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logs = logging.getLogger('inkycal_custom')
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logs.setLevel(level=logging.INFO)
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# Get the path to the Inkycal folder
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top_level = os.path.dirname(
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os.path.abspath(os.path.dirname(__file__))).split('/inkycal')[0]
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# Get path of 'fonts' and 'images' folders within Inkycal folder
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fonts_location = top_level + '/fonts/'
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images = top_level + '/images/'
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# Get available fonts within fonts folder
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fonts = {}
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for path,dirs,files in os.walk(fonts_location):
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for filename in files:
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if filename.endswith('.otf'):
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name = filename.split('.otf')[0]
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fonts[name] = os.path.join(path, filename)
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if filename.endswith('.ttf'):
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name = filename.split('.ttf')[0]
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fonts[name] = os.path.join(path, filename)
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available_fonts = [key for key,values in fonts.items()]
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def get_fonts():
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"""Print all available fonts by name.
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Searches the /font folder in Inkycal and displays all fonts found in
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there.
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Returns:
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printed output of all available fonts. To access a fontfile, use the
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fonts dictionary to access it.
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>>> fonts['fontname']
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To use a font, use the following sytax, where fontname is one of the
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printed fonts of this function:
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>>> ImageFont.truetype(fonts['fontname'], size = 10)
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"""
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for fonts in available_fonts:
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print(fonts)
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def get_system_tz():
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"""Gets the system-timezone
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Gets the timezone set by the system.
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Returns:
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- A timezone if a system timezone was found.
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- None if no timezone was found.
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The extracted timezone can be used to show the local time instead of UTC. e.g.
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>>> import arrow
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>>> print(arrow.now()) # returns non-timezone-aware time
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>>> print(arrow.now(tz=get_system_tz()) # prints timezone aware time.
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"""
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try:
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local_tz = time.tzname[1]
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except:
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print('System timezone could not be parsed!')
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print('Please set timezone manually!. Setting timezone to None...')
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local_tz = None
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return local_tz
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def auto_fontsize(font, max_height):
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"""Scales a given font to 80% of max_height.
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Gets the height of a font and scales it until 80% of the max_height
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is filled.
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Args:
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- font: A PIL Font object.
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- max_height: An integer representing the height to adjust the font to
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which the given font should be scaled to.
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Returns:
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A PIL font object with modified height.
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"""
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fontsize = font.getsize('hg')[1]
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while font.getsize('hg')[1] <= (max_height * 0.80):
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fontsize += 1
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font = ImageFont.truetype(font.path, fontsize)
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return font
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def write(image, xy, box_size, text, font=None, **kwargs):
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"""Writes text on a image.
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Writes given text at given position on the specified image.
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Args:
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- image: The image to draw this text on, usually im_black or im_colour.
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- xy: tuple-> (x,y) representing the x and y co-ordinate.
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- box_size: tuple -> (width, height) representing the size of the text box.
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- text: string, the actual text to add on the image.
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- font: A PIL Font object e.g.
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ImageFont.truetype(fonts['fontname'], size = 10).
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Args: (optional)
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- alignment: alignment of the text, use 'center', 'left', 'right'.
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- autofit: bool (True/False). Automatically increases fontsize to fill in
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as much of the box-height as possible.
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- colour: black by default, do not change as it causes issues with rendering
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on e-Paper.
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- rotation: Rotate the text with the text-box by a given angle anti-clockwise.
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- fill_width: Decimal representing a percentage e.g. 0.9 # 90%. Fill a
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maximum of 90% of the size of the full width of text-box.
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- fill_height: Decimal representing a percentage e.g. 0.9 # 90%. Fill a
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maximum of 90% of the size of the full height of the text-box.
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"""
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allowed_kwargs = ['alignment', 'autofit', 'colour', 'rotation',
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'fill_width', 'fill_height']
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# Validate kwargs
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for key, value in kwargs.items():
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if key not in allowed_kwargs:
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print('{0} does not exist'.format(key))
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# Set kwargs if given, it not, use defaults
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alignment = kwargs['alignment'] if 'alignment' in kwargs else 'center'
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autofit = kwargs['autofit'] if 'autofit' in kwargs else False
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fill_width = kwargs['fill_width'] if 'fill_width' in kwargs else 1.0
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fill_height = kwargs['fill_height'] if 'fill_height' in kwargs else 0.8
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colour = kwargs['colour'] if 'colour' in kwargs else 'black'
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rotation = kwargs['rotation'] if 'rotation' in kwargs else None
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x,y = xy
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box_width, box_height = box_size
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# Increase fontsize to fit specified height and width of text box
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if (autofit == True) or (fill_width != 1.0) or (fill_height != 0.8):
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size = 8
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font = ImageFont.truetype(font.path, size)
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text_width, text_height = font.getsize(text)[0], font.getsize('hg')[1]
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while (text_width < int(box_width * fill_width) and
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text_height < int(box_height * fill_height)):
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size += 1
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font = ImageFont.truetype(font.path, size)
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text_width, text_height = font.getsize(text)[0], font.getsize('hg')[1]
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text_width, text_height = font.getsize(text)[0], font.getsize('hg')[1]
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# Truncate text if text is too long so it can fit inside the box
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if (text_width, text_height) > (box_width, box_height):
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logs.debug(('truncating {}'.format(text)))
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while (text_width, text_height) > (box_width, box_height):
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text=text[0:-1]
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text_width, text_height = font.getsize(text)[0], font.getsize('hg')[1]
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logs.debug((text))
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# Align text to desired position
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if alignment == "center" or None:
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x = int((box_width / 2) - (text_width / 2))
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elif alignment == 'left':
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x = 0
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elif alignment == 'right':
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x = int(box_width - text_width)
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y = int((box_height / 2) - (text_height / 2))
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# Draw the text in the text-box
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draw = ImageDraw.Draw(image)
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space = Image.new('RGBA', (box_width, box_height))
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ImageDraw.Draw(space).text((x, y), text, fill=colour, font=font)
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# Uncomment following two lines, comment out above two lines to show
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# red text-box with white text (debugging purposes)
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#space = Image.new('RGBA', (box_width, box_height), color= 'red')
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#ImageDraw.Draw(space).text((x, y), text, fill='white', font=font)
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if rotation != None:
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space.rotate(rotation, expand = True)
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# Update only region with text (add text with transparent background)
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image.paste(space, xy, space)
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def text_wrap(text, font=None, max_width = None):
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"""Splits a very long text into smaller parts
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Splits a long text to smaller lines which can fit in a line with max_width.
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Uses a Font object for more accurate calculations.
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Args:
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- font: A PIL font object which is used to calculate the size.
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- max_width: int-> a width in pixels defining the maximum width before
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splitting the text into the next chunk.
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Returns:
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A list containing chunked strings of the full text.
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"""
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lines = []
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if font.getsize(text)[0] < max_width:
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lines.append(text)
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else:
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words = text.split(' ')
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i = 0
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while i < len(words):
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line = ''
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while i < len(words) and font.getsize(line + words[i])[0] <= max_width:
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line = line + words[i] + " "
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i += 1
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if not line:
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line = words[i]
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i += 1
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lines.append(line)
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return lines
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def internet_available():
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"""checks if the internet is available.
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Attempts to connect to google.com with a timeout of 5 seconds to check
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if the network can be reached.
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Returns:
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- True if connection could be established.
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- False if the internet could not be reached.
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Returned output can be used to add a check for internet availability:
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>>> if internet_available() == True:
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>>> #...do something that requires internet connectivity
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"""
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try:
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urlopen('https://google.com',timeout=5)
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return True
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except URLError as err:
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return False
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def draw_border(image, xy, size, radius=5, thickness=1, shrinkage=(0.1,0.1)):
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"""Draws a border at given coordinates.
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Args:
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- image: The image on which the border should be drawn (usually im_black or
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im_colour.
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- xy: Tuple representing the top-left corner of the border e.g. (32, 100)
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where 32 is the x co-ordinate and 100 is the y-coordinate.
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- size: Size of the border as a tuple -> (width, height).
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- radius: Radius of the corners, where 0 = plain rectangle, 5 = round corners.
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- thickness: Thickness of the border in pixels.
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- shrinkage: A tuple containing decimals presenting a percentage of shrinking
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-> (width_shrink_percentage, height_shrink_percentage).
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e.g. (0.1, 0.2) ~ shrinks the width of border by 10%, shrinks height of
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border by 20%
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"""
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colour='black'
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# size from function paramter
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width, height = int(size[0]*(1-shrinkage[0])), int(size[1]*(1-shrinkage[1]))
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# shift cursor to move rectangle to center
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offset_x, offset_y = int((size[0] - width)/2), int((size[1]- height)/2)
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x, y, diameter = xy[0]+offset_x, xy[1]+offset_y, radius*2
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# lenght of rectangle size
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a,b = (width - diameter), (height-diameter)
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# Set coordinates for staright lines
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p1, p2 = (x+radius, y), (x+radius+a, y)
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p3, p4 = (x+width, y+radius), (x+width, y+radius+b)
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p5, p6 = (p2[0], y+height), (p1[0], y+height)
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p7, p8 = (x, p4[1]), (x,p3[1])
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if radius != 0:
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# Set coordinates for arcs
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c1, c2 = (x,y), (x+diameter, y+diameter)
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c3, c4 = ((x+width)-diameter, y), (x+width, y+diameter)
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c5, c6 = ((x+width)-diameter, (y+height)-diameter), (x+width, y+height)
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c7, c8 = (x, (y+height)-diameter), (x+diameter, y+height)
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# Draw lines and arcs, creating a square with round corners
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draw = ImageDraw.Draw(image)
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draw.line( (p1, p2) , fill=colour, width = thickness)
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draw.line( (p3, p4) , fill=colour, width = thickness)
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draw.line( (p5, p6) , fill=colour, width = thickness)
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draw.line( (p7, p8) , fill=colour, width = thickness)
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if radius != 0:
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draw.arc( (c1, c2) , 180, 270, fill=colour, width=thickness)
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draw.arc( (c3, c4) , 270, 360, fill=colour, width=thickness)
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draw.arc( (c5, c6) , 0, 90, fill=colour, width=thickness)
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draw.arc( (c7, c8) , 90, 180, fill=colour, width=thickness)
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