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Sep 13, 2024
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make moving-point-on-a-curve faster #4044

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43 changes: 22 additions & 21 deletions doc/python/animations.md
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Original file line number Diff line number Diff line change
Expand Up @@ -145,9 +145,7 @@ fig.show()

```python
import plotly.graph_objects as go

import numpy as np

# Generate curve data
t = np.linspace(-1, 1, 100)
x = t + t ** 2
Expand All @@ -156,7 +154,7 @@ xm = np.min(x) - 1.5
xM = np.max(x) + 1.5
ym = np.min(y) - 1.5
yM = np.max(y) + 1.5
N = 50
N = 25
s = np.linspace(-1, 1, N)
xx = s + s ** 2
yy = s - s ** 2
Expand All @@ -167,26 +165,29 @@ fig = go.Figure(
data=[go.Scatter(x=x, y=y,
mode="lines",
line=dict(width=2, color="blue")),
go.Scatter(x=x, y=y,
mode="lines",
line=dict(width=2, color="blue"))],
layout=go.Layout(
go.Scatter(x=[xx[0]], y=[yy[0]],
mode="markers",
marker=dict(color="red", size=10))])
fig.update_layout(width=600, height=450,
xaxis=dict(range=[xm, xM], autorange=False, zeroline=False),
yaxis=dict(range=[ym, yM], autorange=False, zeroline=False),
title_text="Kinematic Generation of a Planar Curve", hovermode="closest",
updatemenus=[dict(type="buttons",
buttons=[dict(label="Play",
method="animate",
args=[None])])]),
frames=[go.Frame(
data=[go.Scatter(
x=[xx[k]],
y=[yy[k]],
mode="markers",
marker=dict(color="red", size=10))])

for k in range(N)]
)
title_text="Kinematic Generation of a Planar Curve", title_x=0.5,
updatemenus = [dict(type = "buttons",
buttons = [
dict(
args = [None, {"frame": {"duration": 10, "redraw": False},
"fromcurrent": True, "transition": {"duration": 10}}],
label = "Play",
method = "animate",

)])])

fig.update(frames=[go.Frame(
data=[go.Scatter(
x=[xx[k]],
y=[yy[k]])],
traces=[1]) # fig.data[1] is updated by each frame
for k in range(N)])

fig.show()
```
Expand Down