使用 Plotly-python 绘图后防止相机重置

Posted 2023-02-18

【中文标题】使用 Plotly-python 绘图后防止相机重置

【英文标题】：prevent camera resetting after plotting with Plotly-python

【发布时间】：2020-02-09 05:19:36

【问题描述】：

我正在尝试使用 dash 和 plotly 为 3d Quiver 或 Cone 绘制一些数据，并且我想通过间隔 Input 定期更新 Graph！

所以我设法为图表设置了动画，但问题是每次更新后相机角度和缩放都会不断重置。 我有以下代码：

import dash
import dash_core_components as dcc
import dash_html_components as html
import plotly.graph_objs as go
from dash.dependencies import Output, Input
import pickle


#reading initial data
with open("shared.pkl", "rb") as f:
    quivDic = pickle.load(f)


quiver_3d = go.Cone(x = quivDic["X"], y = quivDic["Y"], z = quivDic["Z"],
                    u = quivDic["U"], v = quivDic["V"], w = quivDic["W"],
                    colorscale = 'Blues', name = "testScatter")
data = [quiver_3d]
layout = dict(title ="Test Quiver", showlegend=False, aspectratio=dict(x=1, y=1, z=0.8),
                             camera_eye=dict(x=1.2, y=1.2, z=0.6))

fig = dict(data=data, layout=layout)


app = dash.Dash()
app.layout = html.Div([
    html.Div(html.H4("TEST CONE")),
    html.Div(dcc.Graph(id = "testCone", figure=fig)),
    dcc.Interval(
            id='graph-update',
            interval=1000,
            n_intervals = 0
        ),
])

@app.callback(Output('testCone', 'figure'),
        [Input('graph-update', 'n_intervals')])
def refresh(n):
    #reading new data
    with open("shared.pkl", "rb") as f:
        quivDic = pickle.load(f)

    quiver_3d.x = quivDic["X"]
    quiver_3d.y = quivDic["Y"]
    quiver_3d.z = quivDic["Z"]
    quiver_3d.u = quivDic["U"]
    quiver_3d.v = quivDic["V"]
    quiver_3d.w = quivDic["W"]

    data = [quiver_3d]
    #creating new figure
    fig = dict(data=data)

    return fig




app.run_server(debug=True)

有谁知道如何避免这个问题？ 理想情况下，我想在不重绘整个帧的情况下更新数据，比如 matplotlib 中的“set_data”。否则有没有办法通过回调来跟踪最新的摄像机角度并更新布局？ 谢谢^^

【参考方案1】：

是的，您可以使用uirevision 属性，详见此处：https://community.plot.ly/t/preserving-ui-state-like-zoom-in-dcc-graph-with-uirevision/15793

【讨论】：

你实际上可以对任何东西进行 uirevision，只要你不改变它 :)