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epsimplelib.py
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epsimplelib.py
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"""
ePaperLibrary for Waveshare e-Paper 2.7" Raspberry HAT
Github: https://github.com/lyoko17220/ePaperLibrary
"""
import time
from PIL import Image, ImageFont, ImageDraw, ImageChops
import os
import waveshare_library.epd2in7
ROOT_DIR = os.path.dirname(os.path.abspath(__file__))
# Default font
FONT_PATH = os.path.join(ROOT_DIR, 'FreeMonoBold.ttf')
FONT_SMALL_MAX = ImageFont.truetype(FONT_PATH, 12)
FONT_SMALL = ImageFont.truetype(FONT_PATH, 14)
FONT_NORMAL = ImageFont.truetype(FONT_PATH, 18)
FONT_BIG = ImageFont.truetype(FONT_PATH, 22)
# Colors
BLACK = 0
WHITE = 255
# Size (Portrait mode)
DEVICE_WIDTH = 176
DEVICE_HEIGHT = 264
class EPScreen():
"""
Manager of the screen
"""
def __init__(self, screen_orientation):
self.device = waveshare_library.epd2in7.EPD()
self.device.init()
self.width = None
self.height = None
self.image_live = None # Currently showed/worked
self.image_old = None # Old copy to compare
self.draw = None
if screen_orientation in ('landscape', 'portrait'):
self.screen_orientation = screen_orientation
self.init_image()
else:
raise Exception('Screen orientation not recognized')
def init_image(self):
"""
Set width and height according to screen orientation and generate empty Image and draw
"""
if self.screen_orientation == 'portrait':
self.width = DEVICE_WIDTH
self.height = DEVICE_HEIGHT
elif self.screen_orientation == 'landscape':
self.width = DEVICE_HEIGHT
self.height = DEVICE_WIDTH
if self.image_live is None:
self.image_live = Image.new('1', (self.width, self.height), 255)
self.draw = ImageDraw.Draw(self.image_live)
def update_screen(self, force=False):
"""
Send the new image to HAT
:return: Screen reloaded or not
"""
if self.image_old is None or self.need_to_refresh() or force:
if self.screen_orientation == 'landscape':
self.device.display(self.device.getbuffer(self.image_live.rotate(90, expand=1)))
else:
self.device.display(self.device.getbuffer(self.image_live))
self.image_old = self.image_live
self.init_image()
time.sleep(2)
return True
def need_to_refresh(self):
"""
Return if difference between previous image and the newest
:return False or True
"""
return ImageChops.difference(self.image_live, self.image_old).getbbox() is not None
def get_width(self):
"""
Return width
:return: Width
"""
return self.width
def get_height(self):
"""
Return height
:return: Height
"""
return self.height
## Drawing functions
def add_text_middle(self, y, text, font, fill, width=-1, offset_x=0):
"""
Add text to middle of block
:param y: y in screen
:param text: text to add
:param font: font to use
:param fill: fill of text
:param width: width of block
:param offset_x: offset in x of the block
:return:
"""
if width == -1:
width = self.get_width()
h_origin = font.getsize('a')[1]
w, h = font.getsize(text)
# Vertical offset for symbol fonts
offset_y = 0
if h - h_origin > 5:
offset_y = h - h_origin
self.draw.text((offset_x + width / 2 - w / 2, y - offset_y), text, font=font, fill=fill)
def set_title(self, text):
"""
Add title to screen
:param text:
:return:
"""
self.draw.rectangle((0, 0, self.width, 28), fill=BLACK)
self.add_text_middle(5, text, FONT_NORMAL, WHITE)
def add_text(self, pos, text, font=FONT_NORMAL):
"""
Add simple text
:param pos: (x,y)
:param text: Text to add
:param font: Font to use
:return:
"""
self.draw.text(pos, text, font=font, fill=BLACK)
def add_line(self, pos):
"""
Add line
:param pos: Position xy start/end point
:return:
"""
self.draw.line((pos[0], pos[1], pos[2], pos[3]), fill=BLACK)
def clean_screen(self):
"""
Clean content of screen
"""
self.image_live = None
self.init_image()
self.update_screen()