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Added color_threshold to dendrogram #983

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Added color_threshold to dendrogram #983

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15 changes: 9 additions & 6 deletions plotly/figure_factory/_dendrogram.py
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Original file line number Diff line number Diff line change
Expand Up @@ -17,7 +17,7 @@
def create_dendrogram(X, orientation="bottom", labels=None,
colorscale=None, distfun=None,
linkagefun=lambda x: sch.linkage(x, 'complete'),
hovertext=None):
hovertext=None, color_threshold=None):
"""
BETA function that returns a dendrogram Plotly figure object.

Expand All @@ -32,6 +32,7 @@ def create_dendrogram(X, orientation="bottom", labels=None,
:param (list[list]) hovertext: List of hovertext for constituent traces of dendrogram

clusters
:param (function) color_threshold: function to colour clusters under a set threshold

Example 1: Simple bottom oriented dendrogram
```
Expand Down Expand Up @@ -88,7 +89,7 @@ def create_dendrogram(X, orientation="bottom", labels=None,

dendrogram = _Dendrogram(X, orientation, labels, colorscale,
distfun=distfun, linkagefun=linkagefun,
hovertext=hovertext)
hovertext=hovertext, color_threshold=color_threshold)

return graph_objs.Figure(data=dendrogram.data, layout=dendrogram.layout)

Expand All @@ -100,7 +101,7 @@ def __init__(self, X, orientation='bottom', labels=None, colorscale=None,
width="100%", height="100%", xaxis='xaxis', yaxis='yaxis',
distfun=None,
linkagefun=lambda x: sch.linkage(x, 'complete'),
hovertext=None):
hovertext=None, color_threshold=None):
self.orientation = orientation
self.labels = labels
self.xaxis = xaxis
Expand All @@ -127,7 +128,8 @@ def __init__(self, X, orientation='bottom', labels=None, colorscale=None,
ordered_labels, leaves) = self.get_dendrogram_traces(X, colorscale,
distfun,
linkagefun,
hovertext)
hovertext,
color_threshold)

self.labels = ordered_labels
self.leaves = leaves
Expand Down Expand Up @@ -236,7 +238,7 @@ def set_figure_layout(self, width, height):

return self.layout

def get_dendrogram_traces(self, X, colorscale, distfun, linkagefun, hovertext):
def get_dendrogram_traces(self, X, colorscale, distfun, linkagefun, hovertext, color_threshold):
"""
Calculates all the elements needed for plotting a dendrogram.

Expand All @@ -247,6 +249,7 @@ def get_dendrogram_traces(self, X, colorscale, distfun, linkagefun, hovertext):
:param (function) linkagefun: Function to compute the linkage matrix
from the pairwise distances
:param (list) hovertext: List of hovertext for constituent traces of dendrogram
:param (list) color_threshold: sets the color of cluster under set threshold
:rtype (tuple): Contains all the traces in the following order:
(a) trace_list: List of Plotly trace objects for dendrogram tree
(b) icoord: All X points of the dendrogram tree as array of arrays
Expand All @@ -261,7 +264,7 @@ def get_dendrogram_traces(self, X, colorscale, distfun, linkagefun, hovertext):
d = distfun(X)
Z = linkagefun(d)
P = sch.dendrogram(Z, orientation=self.orientation,
labels=self.labels, no_plot=True)
labels=self.labels, no_plot=True, color_threshold=color_threshold)

icoord = scp.array(P['icoord'])
dcoord = scp.array(P['dcoord'])
Expand Down