使用python在deck.gl中为TripsLayer设置动画答案

【问题标题】：Animating TripsLayer in deck.gl with python使用python在deck.gl中为TripsLayer设置动画
【发布时间】：2021-01-23 22:31:46
【问题描述】：

我在 deck.gl 网站 (this one) 中看到了 TripsLayer 示例，它看起来非常酷。我想完成同样的事情，但使用 pydeck，deck.gl 的 python 绑定。 pydeck 网页 (this one) 中的示例没有动画，我不知道我应该如何做才能获得平滑的动画，如 javascript 示例中所示。我尝试了多种方法（传递列表、函数、具有变化值的变量等），但没有一种方法有效，我找不到任何 pydeck 示例。

谢谢！

【问题讨论】：

标签： python gis deck.gl

【解决方案1】：

确实，该示例应该包含更多行程。下面介绍如何在jupyter notebook中实现多次行程的动画。

import time
import pandas as pd
import pydeck as pdk

data = '[{"agent_id":0,"path":[[-0.63968,50.83091,0.0],[-0.78175,50.83205,0.0]],"time":[65100,65520],"color":[228,87,86]},{"agent_id":1,"path":[[-0.63968,50.83091,0.0],[-0.78175,50.83205,0.0]],"time":[65940,66420],"color":[178,121,162]},{"agent_id":2,"path":[[-0.63968,50.83091,0.0],[-0.37617,50.8185,0.0]],"time":[65340,66360],"color":[157,117,93]},{"agent_id":3,"path":[[-0.63968,50.83091,0.0],[-0.78175,50.83205,0.0]],"time":[65940,66420],"color":[238,202,59]},{"agent_id":4,"path":[[-0.63968,50.83091,0.0],[-0.78175,50.83205,0.0]],"time":[67740,68160],"color":[157,117,93]}]'

df = pd.read_json(data)
view = {"bearing": 0, "latitude": 50.85, "longitude": -0.16, "pitch": 0, "zoom": 9}

time_min = 65_000
time_max = 80_000

layer = pdk.Layer(
    "TripsLayer",
    df,
    get_path='path',
    get_timestamps='time',
    get_color='color',
    opacity=0.8,
    width_min_pixels=3,
    rounded=True,
    trail_length=900,
    current_time=0
)

# Render
r = pdk.Deck(layers=[layer], initial_view_state=view, map_style='dark_no_labels')

r.show()

# Animate
for ct in range(time_min, time_max, 100):
    layer.current_time = ct
    r.update()
    time.sleep(0.1)

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