Add dendrogram viewer to Chart Studio exporter.

glue_plotly/web/export_plotly.py

@@ -7,7 +7,7 @@
 
 from glue.core.layout import Rectangle, snap_to_grid
 
-from glue_plotly.common import histogram, profile, scatter2d, \
+from glue_plotly.common import dendrogram, histogram, profile, scatter2d, \
     data_count, layers_to_export, base_rectilinear_axis
 
 SYM = {'o': 'circle', 's': 'square', '+': 'cross', '^': 'triangle-up',
@@ -141,6 +141,20 @@ def export_profile(viewer):
     return traces, xaxis, yaxis
 
 
+def export_dendrogram(viewer):
+    traces = []
+    layers = layers_to_export(viewer)
+    add_data_label = data_count(layers) > 1
+    for layer in layers:
+        data = layer.mpl_artists[0].get_xydata()
+        trace = dendrogram.trace_for_layer(layer.state, data, add_data_label=add_data_label)
+        traces.append(trace)
+
+    config = dendrogram.layout_config_from_mpl(viewer)
+
+    return traces, config["xaxis"], config["yaxis"]
+
+
 def build_plotly_call(app):
     args = []
     layout = {'showlegend': True, 'barmode': 'overlay', 'bargap': 0,

glue_plotly/web/qt/__init__.py

@@ -1,3 +1,6 @@
+from glue_plotly.web.export_plotly import export_dendrogram
+
+
 def setup():
 
     from glue.config import exporters
@@ -6,6 +9,11 @@ def setup():
                                                export_profile)
     from glue_plotly.web.qt.exporter import save_plotly
 
+    try:
+        from glue_qt.plugins.dendro_viewer import DendrogramViewer
+        DISPATCH[DendrogramViewer] = export_dendrogram
+    except ImportError:
+        pass
     from glue_qt.viewers.scatter import ScatterViewer
     from glue_qt.viewers.histogram import HistogramViewer
     from glue_qt.viewers.profile import ProfileViewer