我有一個 SH1106 顯示器連接到我的 Raspberry Pi，我使用 luma.oled 控制它。我可以用不同的字體顯示各種內(nèi)容，這很棒。但是，我不知道如何在不刷新整個顯示的情況下向當(dāng)前顯示的內(nèi)容添加內(nèi)容。我的代碼是這樣的：from os import systemimport serialfrom time import sleepfrom luma.core.interface.serial import i2cfrom luma.core.render import canvasfrom luma.oled.device import sh1106from PIL import ImageFont# config displaydevice = sh1106(i2c(port=1, address=0x3C), rotate=0)device.clear()FA_solid = ImageFont.truetype('/home/pi/Desktop/tests/fa-solid-900.ttf', 16)FA_regular = ImageFont.truetype('/home/pi/Desktop/tests/fa-regular-400.ttf', 16)text_large = ImageFont.truetype('/home/pi/Desktop/tests/coolvetica condensed rg.ttf', 48)text_small = ImageFont.truetype('/home/pi/Desktop/tests/coolvetica condensed rg.ttf', 16)# display thingsdef show_icon(code): with canvas(device) as draw: draw.text((112, 0), text=code, font=FA_solid, fill="white") def large_text(content, paddingleft =0, paddingtop =0): with canvas(device) as draw: draw.text((0, 0), text=content, font=text_large, fill="white") def small_text(content, paddingleft =0, paddingtop =0): with canvas(device) as draw: draw.text((0, 0), text=content, font=text_small, fill="white")show_icon("\uf124")sleep(2)large_text("Hi ;)")sleep(10)device.clear()這會在右上角顯示一個來自 fontawesome 的圖標(biāo)，然后清除屏幕并顯示 Hi。如何更改它以顯示圖標(biāo) + hi？理想情況下，我會在屏幕上有“區(qū)域”，我可以在其中更改圖標(biāo)區(qū)域，同時保持文本顯示，反之亦然。謝謝！
2 回答
慕容森
TA貢獻1853條經(jīng)驗 獲得超18個贊
我沒有 SH1106 可供測試，也從未使用過該luma庫，因此可能有一種更簡單的方法可以完成您想要的操作。如果是這樣，也許有人會好心地告訴我，我會刪除這個答案。
background = Image.new("RGB", device.size, "white")
background.paste(frame.resize(size, resample=Image.LANCZOS), posn)
device.display(background.convert(device.mode))
所以，看來你可以創(chuàng)建一個PIL Image并將其發(fā)送到顯示器上。第一行創(chuàng)建一個與整個顯示器大小相同的空白白色畫布，第二行將另一個畫布粘貼PIL Image到指定位置的畫布上，最后一行將圖像發(fā)送到顯示器。因此，您需要做的就是分別定義您的N “區(qū)域”并分別繪制它們（每個區(qū)域都是一個PIL Image），然后當(dāng)您想要更新顯示時，將您的N區(qū)域粘貼到您想要的位置并發(fā)送完整的圖片到顯示屏。
抱歉，我不能更準(zhǔn)確，但我沒有什么可以測試的。這是一個包含 3 個區(qū)域的小示例，可以單獨繪制這些區(qū)域，然后在調(diào)用之前將其組裝成一個整體device.display()
#!/usr/bin/env python3
from PIL import Image, ImageDraw
def UpdateDisplay(z1,z2,z3):
? ?"""Pass in the three zones and they will be sent to the screen"""
? ?# Make a black canvas the size of the entire screen
? ?whole = Image.new("RGB", (128,64), (0,0,0))
? ?# Now paste in the 3 zones to form the whole
? ?whole.paste(z1, (2,2))? ? ? ? # zone1 at top-left
? ?whole.paste(z2, (66,2))? ? ? ?# zone2 at top-right
? ?whole.paste(z3, (2,34))? ? ? ?# zone3 across the bottom
? ?# I save the image here, but you would write it to the screen with "device.display()"
? ?whole.save('result.png')
? ?return
# Make zone1 dark grey and annotate it
z1 = Image.new("RGB", (60,30), (64,64,64))
z1draw = ImageDraw.Draw(z1)
z1draw.text((10,10),"Zone1")
# Make zone2 mid-grey and annotate it
z2 = Image.new("RGB", (60,30), (128,128,128))
z2draw = ImageDraw.Draw(z2)
z2draw.text((10,10),"Zone2")
# Make zone3 light grey and annotate it
z3 = Image.new("RGB", (124,28), (192,192,192))
z3draw = ImageDraw.Draw(z3)
z3draw.text((10,10),"Zone3")
# Blit all zones to display
UpdateDisplay(z1,z2,z3)
# Now change just zone 2 and update display
z2.paste("red", (0,0,z2.width,z2.height))
UpdateDisplay(z1,z2,z3)
這是原始顯示：
更新 zone2 后再次出現(xiàn)：
瀟瀟雨雨
TA貢獻1833條經(jīng)驗 獲得超4個贊
好吧，我基本上明白了：
from luma.core.interface.serial import i2c
from luma.core.render import canvas
from luma.oled.device import sh1106
from PIL import ImageFont, Image, ImageDraw
### setting up display using LUMA oled
device = sh1106(i2c(port=1, address=0x3C), rotate=0)
device.clear()
### Initialize drawing zone (aka entire screen)
output = Image.new("1", (128,64))
add_to_image = ImageDraw.Draw(output)
### I have the exterior temp and altitude I want to display. Each has an assigned zone for the icon (FontAwesome) and the data
# temp_ext
temp_zone = [(14,44), (36,64)]
temp_start = (14,44)
temp_icon_zone = [(0,48), (15,64)]
temp_icon_start = (3,48)
add_to_image.text(temp_icon_start, "\uf2c9", font=FA_solid, fill="white")
### every time I have a new reading, I basically draw a black rectangle over what I had and the rewrite the text
add_to_image.rectangle(temp_zone, fill="black", outline = "black")
add_to_image.text(temp_start, str(temp_c), font=text_medium, fill="white")
device.display(output)
這使我能夠只更新我想要的屏幕部分，其余部分保持原樣，最重要的是，在重寫信息時不會有半秒鐘的空白屏幕。歡迎提出優(yōu)化建議！
我仍然需要查看內(nèi)存使用情況，當(dāng)不同區(qū)域同時更新時感覺有點緩慢。但它有效！
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