如何在使用 figure.add_shape(type='line') 创建的 Plotly 中为水平线的 Y 值添加悬停注释

Question

TL;DR：如何为以下代码添加显示 5 的悬停注释：

fig.add_shape(type="line", x0=1, x1=2, y0=5, y1=5,line_width=1.5, line_dash="dot", line_color="red")

我有这段代码，用于显示基于数据在其上绘制枢轴线的烛台。它工作得很好。当您将光标移动到水平线以获取准确值时，我只想显示 y 值。下面是我用来显示水平轴、支撑阻力和垂直日间断线的代码部分：

# I already have a Figure Object from plotly which I access

fig = go.Figure(data = [go.Candlestick(opacity = 0.9, x = stocks[Date], name = 'X',
                                                  open = stocks[Open], high = stocks[High], low = stocks[Low], close = stocks[Close]),])
fig.add_shape(type="line", x0=1, x1=2, y0=5, y1=5,line_width=1.5, line_dash="dot", line_color="red")

如何向这些添加悬停值信息？

这是我的实际图表，所有 Horizontal 线都是使用 fig.add_shape(type='line')

绘制的

Answer 1

直接用走线替换布局形状
这在您的示例代码的范围内显示了这一点，我不得不暗示您的数据从纪元开始并且您的行只有 4 毫秒，所以我将它延长到 4.5 小时

import plotly.graph_objects as go
import pandas as pd
from datetime import datetime
import numpy as np

# setup all necessary variables and MWE could not be provide :-(
stocks = pd.read_csv(
    "https://raw.githubusercontent.com/plotly/datasets/master/finance-charts-apple.csv",
    parse_dates=["Date"],
)
$ rebase data to start at epoch as sample code implies it does
stocks["Date"] = pd.date_range("1-jan-1970", freq="1Min", periods=len(stocks))
Date = "Date"
Open = "AAPL.Open"
High = "AAPL.High"
Low = "AAPL.Low"
Close = "AAPL.Close"


fig = go.Figure(
    data=[
        go.Candlestick(
            opacity=0.9,
            x=stocks[Date],
            name="X",
            open=stocks[Open],
            high=stocks[High],
            low=stocks[Low],
            close=stocks[Close],
        ),
    ]
)


# replace this line of code.  but it's implications are weird.  line for 4 milliseconds just after epoch
# fig.add_shape(type="line", x0=1, x1=2, y0=5, y1=5,line_width=1.5, line_dash="dot", line_color="red")
# replace with this - let's make it 4.5hrs long
fig.add_shape(
    type="line",
    x0=1,
    x1=1.5 * 10 ** 7,
    y0=5,
    y1=5,
    line_width=1.5,
    line_dash="dot",
    line_color="red",
)
# equivalend as a trace, and now have hover...
fig.add_traces(
    go.Scatter(
        x=np.linspace(1, 1.5 * 10 ** 7, 100),
        y=np.repeat([5], 100),
        mode="lines",
        line_dash="dot",
        line_color="red",
        showlegend=False,
    )
)

如何在使用 figure.add_shape(type='line') 创建的 Plotly 中为水平线的 Y 值添加悬停注释

How to add Hovering Annotation for the Y value of a Horizontal Line in Plotly created using figure.add_shape(type='line')

python

data-visualization

plotly

plotly-python