From 5ade52f2b2be9ecc26f15c85846c0d953aa26ea4 Mon Sep 17 00:00:00 2001
From: Philipp Rudiger <prudiger@anaconda.com>
Date: Sat, 23 Feb 2019 13:48:14 +0000
Subject: [PATCH 1/2] Implement datetime hover for Raster/Image types

---
 holoviews/plotting/bokeh/raster.py | 32 ++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)

diff --git a/holoviews/plotting/bokeh/raster.py b/holoviews/plotting/bokeh/raster.py
index ce0020da0a..3da5f3dd7f 100644
--- a/holoviews/plotting/bokeh/raster.py
+++ b/holoviews/plotting/bokeh/raster.py
@@ -3,6 +3,8 @@
 import numpy as np
 import param
 
+from bokeh.models import DatetimeAxis, CustomJSHover
+
 from ...core.util import cartesian_product, dimension_sanitizer, isfinite
 from ...element import Raster, RGB, HSV
 from .element import ElementPlot, ColorbarPlot
@@ -34,6 +36,36 @@ def _hover_opts(self, element):
                 tooltips.append((vdim.pprint_label, '@{0}'.format(vname)))
         return tooltips, {}
 
+    def _postprocess_hover(self, renderer, source):
+        super(RasterPlot, self)._postprocess_hover(renderer, source)
+        hover = self.handles.get('hover')
+        if not isinstance(hover.tooltips, list):
+            return
+
+        element = self.current_frame
+        xdim, ydim = [dimension_sanitizer(kd.name) for kd in element.kdims]
+        xaxis = self.handles['xaxis']
+        yaxis = self.handles['yaxis']
+
+        code = """
+        var {ax} = special_vars.{ax};
+        var date = new Date({ax});
+        return date.toISOString().slice(0, 19).replace('T', ' ')
+        """
+        tooltips, formatters = [], dict(hover.formatters)
+        for (name, formatter) in hover.tooltips:
+            if isinstance(xaxis, DatetimeAxis) and formatter == '$x':
+                xhover = CustomJSHover(code=code.format(ax='x'))
+                formatters['$x'] = xhover
+                formatter += '{custom}'
+            if isinstance(yaxis, DatetimeAxis) and formatter == '$y':
+                yhover = CustomJSHover(code=code.format(ax='y'))
+                formatters['$y'] = yhover
+                formatter += '{custom}'
+            tooltips.append((name, formatter))
+        hover.tooltips = tooltips
+        hover.formatters = formatters
+
     def __init__(self, *args, **kwargs):
         super(RasterPlot, self).__init__(*args, **kwargs)
         if self.hmap.type == Raster:

From af0724f7c292b1cb44f226a44cc50e99e3e6b40b Mon Sep 17 00:00:00 2001
From: Philipp Rudiger <prudiger@anaconda.com>
Date: Sat, 23 Feb 2019 14:17:07 +0000
Subject: [PATCH 2/2] Minor fix

---
 holoviews/plotting/bokeh/raster.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/holoviews/plotting/bokeh/raster.py b/holoviews/plotting/bokeh/raster.py
index 3da5f3dd7f..5c25eae7a1 100644
--- a/holoviews/plotting/bokeh/raster.py
+++ b/holoviews/plotting/bokeh/raster.py
@@ -39,7 +39,7 @@ def _hover_opts(self, element):
     def _postprocess_hover(self, renderer, source):
         super(RasterPlot, self)._postprocess_hover(renderer, source)
         hover = self.handles.get('hover')
-        if not isinstance(hover.tooltips, list):
+        if not (hover and isinstance(hover.tooltips, list)):
             return
 
         element = self.current_frame