add charting services.

app/services/charting_services.py

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+from bokeh.plotting import figure, output_file, show
+from bokeh.embed import components
+from bokeh.io import show, output_file
+from bokeh.models import ColumnDataSource
+from bokeh.palettes import Blues256, Category20c
+from bokeh.plotting import figure
+from bokeh.transform import factor_cmap, cumsum
+
+def build_creation_date_chart(data, title):
+    units = list(data.keys())
+    totals = list(data.values())
+
+    if title == "By Year":
+        units.reverse()
+        totals.reverse()
+        
+    source = ColumnDataSource(data=dict(units=units, totals=totals))
+
+    chart = figure(x_range=units, plot_height=350, plot_width=800,
+               toolbar_location=None, title=title)
+
+    chart.vbar(x='units', top='totals', width=0.9, source=source,
+           legend_field="units",line_color='white',
+           fill_color=factor_cmap('units', palette=Blues256, factors=units))
+    
+    chart.title.text_font_size = '18pt'
+    chart.title.text_font = "intended, sans-serif"
+    chart.title.text_color = "#424242"
+    chart.outline_line_color = "#424242"
+    chart.xgrid.grid_line_color = None
+    chart.ygrid.grid_line_color = "#424242"
+    chart.y_range.start = 0
+    chart.y_range.end = (max(totals) + 10)
+    chart.background_fill_color = "#f5f5f6"
+    chart.border_fill_color = "#f5f5f6"
+    chart.legend.visible = False
+
+    script, div = components(chart)
+
+    return [script, div]
+
+def build_sorted_chart(data, title):
+    d = sorted(data.items())
+    totals = list()
+    units = list()
+    for i in d:
+        units.append(i[0])
+        totals.append(i[1])
+        
+    source = ColumnDataSource(data=dict(units=units, totals=totals))
+
+    chart = figure(x_range=units, plot_height=350, plot_width=800,
+               toolbar_location=None, title=title)
+
+    chart.vbar(x='units', top='totals', width=0.9, source=source,
+           legend_field="units",line_color='white',
+           fill_color=factor_cmap('units', palette=Blues256, factors=units))
+    
+    chart.title.text_font_size = '18pt'
+    chart.title.text_font = "intended, sans-serif"
+    chart.title.text_color = "#424242"
+    chart.outline_line_color = "#424242"
+    chart.xgrid.grid_line_color = None
+    chart.ygrid.grid_line_color = "#424242"
+    chart.y_range.start = 0
+    chart.y_range.end = (max(totals) + 10)
+    chart.background_fill_color = "#f5f5f6"
+    chart.border_fill_color = "#f5f5f6"
+    chart.legend.visible = False
+
+    script, div = components(chart)
+
+    return [script, div]