Bokeh服务器回调工具

Question

我是Python的新手,目前正在使用Bokeh进行交互式绘图可视化,我需要显示多个相关图表.为了实现这一点,我正在使用散景服务器.

我一直在阅读文档和一些示例,但我一直无法找到由绘图上的选择触发的python回调(在服务器中执行)的示例.基本上我想做的是:

from bokeh.plotting import figure, curdoc
from bokeh.layouts import column
from bokeh.models import ColumnDataSource

TOOLS = "tap"
p = figure(title="Some Figure", tools=TOOLS)

source = ColumnDataSource(dict(x=[[1, 3, 2], [3, 4, 6, 6]], y=[[2, 1, 4], [4, 7, 8, 5]], name=['A', 'B']))

p.patches('x', 'y', source=source, color=["firebrick", "navy"], alpha=[0.8, 0.3], line_width=2)


def callback():
    print("TapTool callback executed on Patch {}")


??? <- some code here linking the taptool with the callback function defined above


curdoc().add_root(column(p))

然后在执行服务器并单击补丁时:

2017-02-14 16:32:00,000在补丁A上执行TapTool回调

这种行为可以用散景来实现吗？

Answer 1

从项目维护人员编辑.

围绕选择导致1.0的一些混乱和回归.对于任何1.0版本的版本,对于大多数用例,您现在想要在以下'indices'属性上使用回调selected:

source.selected.on_change('indices', callback)

这种用法现在在集成测试下持续严格地维护,并且应该用于任何1.0 Bokeh版本.

该selected事件可以链接到更新功能,如下所示:

from bokeh.plotting import figure, curdoc
from bokeh.layouts import column
from bokeh.models import ColumnDataSource

TOOLS = "tap"
p = figure(title="Some Figure", tools=TOOLS)

source = ColumnDataSource(dict(x=[[1, 3, 2], [3, 4, 6, 6]],
                y=[[2, 1, 4], [4, 7, 8, 5]], name=['A', 'B']))

pglyph = p.patches('x', 'y', source=source, color=["firebrick", "navy"],
                                alpha=[0.8, 0.3], line_width=2)

def callback(attr, old, new):
    # The index of the selected glyph is : new['1d']['indices'][0]
    patch_name =  source.data['name'][new['1d']['indices'][0]]
    print("TapTool callback executed on Patch {}".format(patch_name))

pglyph.data_source.on_change('selected',callback)

curdoc().add_root(column(p))

更新更新的Bokeh版本.测试版本0.12.16

正如@Karel Marik所提到的,字形不能同时混合直接值赋值ColumnDataSource.所以前面的代码不起作用.这是一个仅使用的更新source,其中还包括打印多个选项的代码(使用shift + click):

from bokeh.plotting import figure, curdoc
from bokeh.layouts import column
from bokeh.models import ColumnDataSource

TOOLS = ["tap"]
p = figure(title="Some Figure", tools=TOOLS)

source = ColumnDataSource(dict(
    x=[[1, 3, 2], [3, 4, 6, 6]],
    y=[[2, 1, 4], [4, 7, 8, 5]],
    name=['A', 'B'],color=["firebrick", "navy"],
    alpha=[0.8,0.3],line_width=[3,3]))

pglyph = p.patches('x', 'y', color="color", alpha="alpha",
                   line_width="line_width", source=source)

def callback(attr, old, new):
    # The index of the selected glyph is : new['1d']['indices'][0]
    selections = new['1d']['indices']
    print("Number of selections:{}".format(len(selections)))
    for index in selections:
        patch_name =  source.data['name'][index]
        print("TapTool callback executed on Patch {}".format(patch_name))

pglyph.data_source.on_change('selected',callback)

curdoc().add_root(column(p))