plotly.py:更改线条不透明度，使标记不透明 [英] plotly.py: change line opacity, leave markers opaque

问题描述

是否可以更改线条不透明度而不是标记不透明度?我发现我可以设置整行的不透明度，包括标记(opacity = .5)和标记之一(例如 marker={"opacity":1}).

如本例所示:

plotly 导入导入 plotly.graph_objs as goplotly.offline.init_notebook_mode(connected=True) # 我在 jupyter notebook 中运行x = np.arange(0,10)ys = [np.random.rand(10) for _ in range(3)]行 = []对于 y 中的 y:line = go.Scatter(x=x, y=y, mode="markers+lines", opacity=.5, marker={'symbol': 'x', 'size': "15", "opacity":1})行.追加(行)fig = go.Figure(数据=行，布局=go.Layout(showlegend=True))plotly.offline.iplot(fig)

在此处查看结果:

我的问题如下:我的数据点很重要，线条只是视觉辅助.我想让线条 .5 不透明，但让标记完全不透明.
但是，当我设置 opacity=.5, marker={'opacity':1} 时，标记的不透明度也会降低.(我相信标记不透明度是在 [0, line-opacity] 范围内定义的.

有什么方法可以获得线条的颜色并调整其不透明度(甚至在创建线条之后，但在绘制之前).我知道我可以创建两条轨迹，一条是点，一条是线.但是，我希望它们具有相同的颜色，而无需手动指定颜色.(轨迹的数量是不同的，所以我更喜欢坚持分配不同颜色的标准机制)

编辑:我目前的解决方案是将线宽设置为 0.5，这样看起来更好，但显然这个解决方案对我有用，可能对人们没有用谁想要粗体和不那么不透明的线条.

EDIT:关于这个问题/功能请求/行为的 Github 问题:

Is it possible to change the line opacity but not the marker opacity? I found that I can set the opacity of the entire line including markers (opacity = .5) and the one of the marker (e.g. marker={"opacity":1}).

As shown in this example:

import plotly
import plotly.graph_objs as go
plotly.offline.init_notebook_mode(connected=True)  # I'm running in a jupyter notebook

x = np.arange(0,10)
ys = [np.random.rand(10) for _ in range(3)]

lines = []
for y in ys:
    line = go.Scatter(x=x, y=y, mode="markers+lines", opacity=.5, marker={'symbol': 'x', 'size': "15", "opacity":1})
    lines.append(line)           
fig = go.Figure(
    data=lines,
    layout=go.Layout(showlegend=True)
)
plotly.offline.iplot(fig)

See result here:

My problem is the following: My data points are important, the lines are just visual aid. I want to make the lines .5-opaque but have the markers fully opaque.
However, when I set opacity=.5, marker={'opacity':1} the opacity of the marker is also reduced. (I believe that the marker-opacity is defined in the range [0, line-opacity].

Is there any way I can get the colour of the line and adjust its opacity (perhaps even after creating the line, but before plotting it). I know that I could create two traces, one with the points and one with the lines. However, I would like them to be the same colour without having to manually specify the colours. (The number of traces is varying, so I prefer sticking to the standard mechanism that assigns the different colours)

EDIT: My current solution is to set the line-width to 0.5 so it looks better, but obviously this solution works for me and might not be useful to people who want bold and less opaque lines.

EDIT: Github issue concerning this problem/feature request/behaviour: https://github.com/plotly/plotly.js/issues/2684

解决方案

I create three random lines to but simplify the answer down, one could use: line=dict(color='rgba(255, 0, 0, 0.5)') - example from @david Parks

Line objects don't have opacity attributes but you can assign colors using RGBA and set the alpha. You have to assign a color for the markers using RGBA or it will inherit from the line.

See the following for an example:

import plotly
import numpy as np
import plotly.graph_objs as go

plotly.offline.init_notebook_mode(connected=True)
x = np.arange(0,10)
ys = [np.random.rand(10) for _ in range(3)]

lines = []
dots = []
for y in ys:
    my_color = ('rgba('+str(np.random.randint(0, high = 256))+','+
                str(np.random.randint(0, high = 256))+','+
                str(np.random.randint(0, high = 256)))
    line = go.Scatter(
            x=x, 
            y=y, 
            mode="lines+markers", 
            marker={ 
                    'symbol': 'x', 
                    'size': "15", 
                    'color':my_color+',1)'
                    },
            line={
                "color":my_color+',0.2)'
            }
            )
    lines.append(line)  
fig = go.Figure(
    data=lines,
    layout=go.Layout(showlegend=True)
)
plotly.offline.iplot(fig)

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