Bokeh + Datashader + Bokeh -捕获鼠标双击

Question

我正在使用Bokeh、DataShader和HoloViews为大数据实现一个DataShader。ScatterPlot部分本身已经基本完成，但有一个要求我有问题:我需要能够捕获数据坐标，用户做双击。

我在木星笔记本中找到了一些适用于我的代码，但出于某种原因，在迁移到Python和Bokeh时，它没有。

以下是代码：

    from os.path import dirname, join
import csv

import holoviews as hv
import datashader as ds

import pandas as pd


#import parambokeh
from holoviews.operation.datashader import aggregate, shade, datashade, dynspread
from holoviews.operation import decimate
from holoviews.streams import RangeXY
from holoviews import streams
from bokeh.plotting import curdoc
hv.extension('bokeh')



class MyScatterPlotBokeh:


#
#   PARAMETERS:
#                - keyFieldName    : Field  that uniquely identify a row
#                - xFieldName      : Field Name used for x-Axis
#                - yFieldName      : Field Name used for y-Axis
#                - colorFieldName  : Field Name used to select circle colors
#                - otherFieldNames : Comma separated value variable with the name of all fields we want to show data 
#
    def __init__(self, filePath, title, screenWidth, screenHeight, keyFieldName, xFieldName, yFieldName, colorFieldName, otherFieldNames):


           self._screenHeight = screenHeight
           self._screenWidth  = screenWidth

#  Read data from file
           df = pd.read_csv(filePath)
           df[colorFieldName]=df[colorFieldName].astype("category")

#  Creating graphic
           hover_opts = hv.opts("QuadMesh [tools=['hover']] (alpha=0 hover_alpha=0.2)")            
           self._points = hv.Points(df,kdims=[xFieldName,yFieldName])         
           self._dynamic_hover = datashade(self._points) * dynspread(datashade(self._points, aggregator=ds.count_cat(colorFieldName))) * \
             hv.util.Dynamic(aggregate(self._points, width=50, height=50, streams=[RangeXY]),operation=hv.QuadMesh) 


# Interaction - Point selection
           double_tap = streams.DoubleTap(transient=True, source=self._points)

           self._countTap = 0
           self._taps = []


           def record_taps(x,y):      
               print "clicked"
               self._countTap += 1
               if self._countTap>2: 
                 self._countTap = 0
               if None not in [x,y]:
                  if self._countTap == 1:
                     self._taps.insert(0,(x, y))
                  else:
                     self._taps.append((x, y))
               print "TAPS LOOK LIKE "  + str(self._taps)
               return hv.Points(self._taps, vdims='Taps')


           self._finalPlot = self._dynamic_hover + hv.DynamicMap(record_taps, streams=[double_tap])



    def draw(self):
        hv.renderer('bokeh').server_doc(self._finalPlot)

一旦服务器被执行，我就可以看到显示“单击”的消息，但从来没有在浏览器上双击之后出现过。就像双击事件没有响应一样。最后，我需要将点击的X&Y坐标发送到浏览器，我认为我可以通过从python代码创建一个输入框来完成这个任务，但我还没有。

任何帮助都将不胜感激。

Answer 1

使用1.9.2版本修复了philippjfr指出的问题

我怀疑这是最近解决的一个bug (参见github.com/ioam/holoview/pull/2239)。你介意试试HoloViews大师吗？我们将尝试尽快发布v1.9.3错误修复版本。- philippjfr