Bokeh，如何使用CustomJS回调更改用于字形颜色的列？

问题描述

我正在使用Bokeh通过将 ColumnDataSource 传递给 figure.circle 函数来创建散点图。数据源具有为每个点指定某些颜色的列，每行都有一个十六进制代码，因为我想要使用的着色方案有点复杂。

I'm using Bokeh to create scatter plots by passing a ColumnDataSource to the figure.circle function. The data source has columns that designate certain colors for each point, with a hex code in each row, because the coloring scheme I want to use is somewhat complicated.

是否存在一种更改用于为小部件回调中的圆圈着色的列的方法？我想象一个下拉菜单，允许用户为点选择各种着色方案。

Is there a way to change the column used to color the circles in the callback of a widget? I'm imagining a dropdown menu allowing users to choose various coloring schemes for the points.

推荐答案

这是一个解决方案的例子使用 models.Select 小部件和 models.CustomJS 选择<$ c $中定义的两种着色方案c> ColumnDataSource of Figure.circle ：

Here is an example of a solution using a models.Select widget and models.CustomJS to select out of two coloring schemes defined in the ColumnDataSource of Figure.circle:

import bokeh
import bokeh.plotting
p = bokeh.plotting.figure(x_range=(0,4), y_range=(0,4), plot_height=200 )
csource = bokeh.models.ColumnDataSource(data=dict(
        x=[1,2,3],
        y=[1,2,1],
        colors1=["#ff0000","#00ff00","#0000ff"],
        colors2=["#ff00ff","#ffff00","#00ffff"]))
cir = p.circle(x="x",y="y",fill_color="colors1",line_color="colors1",
               size=20,source=csource)
cb_cselect = bokeh.models.CustomJS(args=dict(cir=cir,csource=csource), code ="""
    var selected_color = cb_obj.value;
    cir.glyph.line_color.field = selected_color;
    cir.glyph.fill_color.field = selected_color;
    csource.trigger("change")
""")
color_select = bokeh.models.Select(title="Select colors", value="colors1",
                    options = ["colors1","colors2"], callback = cb_cselect)
layout = bokeh.layouts.gridplot([[p],[color_select]])
bokeh.io.output_file("output.html")
bokeh.io.show(layout)

输出看起来像

The output looks like

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