如何使用回调更改字形的颜色？

Question

我已经尝试过使用 Bokeh，现在我想搜索一个单词并更改其字形的颜色。 我的代码看起来像这样：

import bokeh.plotting as bp
from bokeh.models import HoverTool, CustomJS
from bokeh.models.widgets import TextInput
from bokeh.io import vform

words = ["werner", "herbert", "klaus"]
x=[1,2,3]
y=[1,2,3]
color = ['green', 'blue', 'red']
word_input= TextInput(value="word", title="Point out a word")

source = bp.ColumnDataSource(data= dict(x=x,y=y,words=words, color='color'))
hover= HoverTool(tooltips=[("word", "@words")])

# output to static HTML file (with CDN resources)
bp.output_file("plot.html", mode="cdn")

# create a new plot with the tools above, and explicit ranges
p = bp.figure(plot_height = 600, plot_width = 800, title="word2vec", tools=[hover], logo =None)
# add a circle renderer with vectorized colors and sizes
p.circle('x','y', radius= 0.1, color = color, source=source, line_color=None)
callback= CustomJS(args=dict(source=source), code ="""
    var data = source.get('data');
    var glyph = cb_obj.get('value')
    words = data['words']
    colors=data['color']
    for (i=0; i< words.length;i++){
        if(glyph==words[i]){colors[i]='yellow'}        
    }
    source.trigger('change');
""")
layout = vform(word_input, p)
# show the results
bp.show(layout)

这段代码行不通，我不知道为什么不行。

我做错了什么？ 那天早些时候我发布了另一个问题，这是解决它的第一步。

Answer 1

你有几个问题：

• 您创建了CallbackJS但从未设置为TextInput的回调属性

• 您将数据字典的color键设置为字符串"color"而不是颜色列表

• 您将实际的颜色列表作为color参数传递给figure （它应该是您要使用的数据源列的字符串名称，例如"color" ）

---

这是一个有效的版本：

from bokeh.io import vform
from bokeh.models import HoverTool, CustomJS
from bokeh.models.widgets import TextInput
from bokeh.plotting import output_file, figure, show, ColumnDataSource

output_file("plot.html")

words = ["werner", "herbert", "klaus"]
x, y = [1,2,3], [1,2,3]
color = ['green', 'blue', 'red']

source = ColumnDataSource(data=dict(x=x, y=y, words=words, color=color))

hover = HoverTool(tooltips=[("word", "@words")])

p = figure(plot_height=600, plot_width=800, title="word2vec", tools=[hover])
p.circle('x','y', radius=0.1, fill_color='color', source=source, line_color=None)

callback = CustomJS(args=dict(source=source), code="""
    var data = source.get('data')
    var value = cb_obj.get('value')
    var words = data['words']
    for (i=0; i < words.length; i++) {
        if ( words[i]==value ) { data.color[i]='yellow' }
    }
    source.trigger('change')
""")

word_input = TextInput(value="word", title="Point out a word", callback=callback)

layout = vform(word_input, p)

show(layout)

Answer 2

更新@bigreddot 的解决方案，以便在其他人遇到类似任务时在 Bokeh 2.2.3 下工作。

from bokeh.layouts import column
from bokeh.models import HoverTool, CustomJS
from bokeh.models.widgets import TextInput
from bokeh.plotting import output_file, figure, show, ColumnDataSource

output_file("plot.html")

words = ["werner", "herbert", "klaus"]
x, y = [1,2,3], [1,2,3]
color = ['green', 'blue', 'red']

source = ColumnDataSource(data=dict(x=x, y=y, words=words, color=color))

hover = HoverTool(tooltips=[("word", "@words")])

p = figure(plot_height=600, plot_width=800, title="word2vec", tools=[hover])
p.circle('x','y', radius=0.1, fill_color='color', source=source, line_color=None)

callback = CustomJS(args=dict(source=source), code="""
    var data = source.data;
    var value = cb_obj.value;
    var words = data['words'];
    for (var i=0; i < words.length; i++) {
        if ( words[i]==value ) { data.color[i]='yellow' }
    }
    source.change.emit();
""")

word_input = TextInput(value="word", title="Point out a word")

word_input.js_on_change('value', callback)

layout = column(word_input, p)

show(layout)