Add tools option to declare list of tools (#120)

examples/user_guide/Plotting.ipynb

@@ -633,6 +633,7 @@
     "- ``loglog`` (default=False): Enables logarithmic x- and y-axis\n",
     "- ``shared_axes`` (default=False): Whether to link axes between plots\n",
     "- ``title`` (default=''): Title for the plot\n",
+    "- ``tools`` (default=[]): List of tool instances or strings (e.g. ['tap', box_select'])\n",
     "- ``xformatter``/``yformatter`` (default=None): Formatter for the x-axis and y-axis (accepts printf formatter, e.g. '%.3f', and bokeh TickFormatter)\n",
     "- ``xlabel``/``ylabel`` (default=None): Axis labels for the x-axis and y-axis\n",
     "- ``xlim``/``ylim`` (default=None): Plot limits of the x- and y-axis\n",

hvplot/converter.py

@@ -8,6 +8,7 @@
 import pandas as pd
 import numpy as np
 
+from bokeh.models import HoverTool
 from holoviews.core.dimension import Dimension
 from holoviews.core.spaces import DynamicMap, HoloMap, Callable
 from holoviews.core.overlay import NdOverlay
@@ -143,7 +144,7 @@ def __init__(self, data, x, y, kind=None, by=None, use_index=True,
                  precompute=False, flip_xaxis=False, flip_yaxis=False,
                  dynspread=False, hover_cols=[], x_sampling=None,
                  y_sampling=None, project=False, xlabel=None, ylabel=None,
-                 xformatter=None, yformatter=None, **kwds):
+                 xformatter=None, yformatter=None, tools=[], **kwds):
 
         # Process data and related options
         self._process_data(kind, data, x, y, by, groupby, row, col,
@@ -235,8 +236,12 @@ def __init__(self, data, x, y, kind=None, by=None, use_index=True,
         if rot:
             axis = 'yrotation' if invert else 'xrotation'
             plot_opts[axis] = rot
-        if hover:
-            plot_opts['tools'] = ['hover']
+
+        tools = list(tools)
+        if hover and not any(t for t in tools if isinstance(t, HoverTool)
+                             or t == 'hover'):
+            tools.append('hover')
+        plot_opts['tools'] = tools
 
         if self.crs and global_extent:
             plot_opts['global_extent'] = global_extent