Question

我正在使用Bokeh，DataShader和HoloViews为大数据实现ScatterPlot。 ScatterPlot部分本身已经完成，但有一个要求我遇到了问题：我需要能够捕获用户双击的数据坐标。

我在Jupyter笔记本中发现了一些对我有用的代码，但出于某种原因，在迁移到Python和Bokeh Server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)

一旦服务器执行，我就会看到“点击”消息显示，但从未在浏览器上双击之后。就像双击事件没有响应。最后我需要发送点击的X＆amp; Y坐标到浏览器，我认为我可以通过从python代码创建一个输入框来实现，但我还没有。

任何帮助将不胜感激。

Answer 1

使用版本1.9.2解决了 philippjfr

指出的问题

我怀疑这是最近解决的错误（请参阅github.com/ioam/holoviews/pull/2239）。你介意尝试HoloViews大师吗？我们将尝试尽快发布v1.9.3错误修复版本。 - philippjfr

散景+ Datashader +散景 - 捕捉鼠标双击

1 个答案: