我正在创建一个 Google 协作实验室,其中包含图像上热图的一些数据可视化。我一直在使用类似于 plotly website 中找到的代码。 .
对于网站上的链接,它可以正常工作,但当尝试使用 Google 云端硬盘链接时,它不起作用。我正在使用以下格式的链接:https://docs.google.com/uc?export=download&id=<file-id>
在 markdown 字段中使用图像时,图像显示正常,但不是通过绘图。
代码示例:
fig = px.density_heatmap(df, x="x", y="y",
color_continuous_scale = [(0, "rgba(0, 255, 0, 0)"),
(0.5, "rgba(0, 255, 0, 0.5)"),
(1, "rgba(0, 255, 0, 1)")],
height=810, width=1440)
fig.add_layout_image(
dict(
source="https://docs.google.com/uc?export=download&id=1JEyyYCse6sWM3yMUwDG2l7XzaGxej-VZ",
xref="x",
yref="y",
x=0,
y=0,
sizex=1920,
sizey=1080,
sizing="stretch",
opacity=1,
layer="below")
)
fig.update_layout(template="plotly_white")
fig.show()
是否有解决方案,或者这只是库没有考虑极端情况的情况?
编辑:我希望使用未公开提供的 Google Drive 链接,希望我可以使用 Google Colab 凭据。找到了可能的答案 here
最佳答案
提示您下载图像的 URL。正如 plotly documentation 中提到的您需要图像的 URL 或 PIL 图像对象。
A background image can be added to the layout of a figure with fig.add_layout_image or by setting the images parameter of go.Layout. The source attribute of a go.layout.Image can be the URL of an image, or a PIL Image object (from PIL import Image; img = Image.open('filename.png')).
也就是说,您可以下载图像并将其作为 PIL 图像对象读取到 python 中,然后将其用作背景。
参见下面的示例;由于您尚未共享数据,因此我正在使用plotly网页上的示例数据集。
import requests
from PIL import Image
import plotly.graph_objects as go
下载图像
## function to dowload google drive image taken from https://stackoverflow.com/a/39225272/6461462
def download_file_from_google_drive(id, destination):
URL = "https://docs.google.com/uc?export=download"
session = requests.Session()
response = session.get(URL, params = { 'id' : id }, stream = True)
token = get_confirm_token(response)
if token:
params = { 'id' : id, 'confirm' : token }
response = session.get(URL, params = params, stream = True)
save_response_content(response, destination)
def get_confirm_token(response):
for key, value in response.cookies.items():
if key.startswith('download_warning'):
return value
return None
def save_response_content(response, destination):
CHUNK_SIZE = 32768
with open(destination, "wb") as f:
for chunk in response.iter_content(CHUNK_SIZE):
if chunk: ## filter out keep-alive new chunks
f.write(chunk)
if __name__ == "__main__":
file_id = 'TAKE ID FROM SHAREABLE LINK'
destination = 'DESTINATION FILE ON YOUR DISK'
download_file_from_google_drive(file_id, destination)
## download the image
download_file_from_google_drive("1JEyyYCse6sWM3yMUwDG2l7XzaGxej-VZ", "D:\\test\\gdrive.png")
图表
## read the image into python as a PIL Image object
img = Image.open("D:\\test\\gdrive.png")
## Create figure
fig = go.Figure()
## Add trace
fig.add_trace(
go.Scatter(x=[0, 0.5, 1, 2, 2.2], y=[1.23, 2.5, 0.42, 3, 1])
)
## Add images
fig.add_layout_image(
dict(
source=img,
xref="x",
yref="y",
x=0,
y=3,
sizex=3,
sizey=3,
sizing="stretch",
opacity=0.5,
layer="below")
)
## Set templates
fig.update_layout(template="plotly_white")
fig.show()
关于python - 背景图像来自 Google Drive 中的 plotly ,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/62470489/