def display_image(self, name, centered=True):
# cache images to avoid re-reading them for each request
# (we use a lazy loading method to avoid too long program
# start time if loading all of them on init)
try:
img = self._images[name]
except KeyError:
self._images[name] = img = Image.open(os.path.join(os.path.dirname(__file__), 'img', name + '.png'))
self._screen.clear()
if centered:
xy = tuple((d1 - d0) / 2 for d1, d0 in zip(self._screen.shape, img.size))
else:
xy = (0, 0)
self._screen.img.paste(img, xy)
self._screen.update()
""" Draw some stuff on the LCD.
"""
import time
import os
from ev3dev.display import Screen, Image
screen = Screen()
screen.hide_cursor()
w, h = screen.shape
for image_file in ('tux.png', 'pobot.png', 'smiley.png'):
decal = Image.open(os.path.join(os.path.dirname(__file__), 'img', image_file))
iw, ih = decal.size
screen.draw.rectangle(
((0, 0), (w-1, h-1)),
outline='black'
)
for i, dim in enumerate(zip('wh', (w, h))):
label, value = dim
s = "%s=%d" % (label, value)
tw, th = screen.draw.textsize(s)
screen.draw.text((w - tw - 1, 2 + i * th), s)
screen.draw.arc((5, 5, 25, 25), 0, 360)
screen.draw.arc((w - 25, h - 25, w - 5, h - 5), 0, 360)
