1 files changed, 51 insertions, 1 deletions
diff --git a/python/fatcat_web/graphics.py b/python/fatcat_web/graphics.py
index 5493d175..96c3531a 100644
--- a/python/fatcat_web/graphics.py
+++ b/python/fatcat_web/graphics.py
@@ -1,8 +1,10 @@
 
+from typing import List, Tuple, Dict
+
 import pygal
 from pygal.style import CleanStyle
 
-def ia_coverage_histogram(rows):
+def ia_coverage_histogram(rows: List[Tuple]) -> pygal.Graph:
     """
     Note: this returns a raw pygal chart; it does not render it to SVG/PNG
     """
@@ -34,3 +36,51 @@ def ia_coverage_histogram(rows):
     chart.add('via Fatcat', [y['available'] for y in years])
     chart.add('Missing', [y['missing'] for y in years])
     return chart
+
+def preservation_by_year_histogram(rows: List[Dict]) -> pygal.Graph:
+    """
+    Note: this returns a raw pygal chart; it does not render it to SVG/PNG
+    """
+
+    years = sorted(rows, key=lambda x: x['year'])
+
+    CleanStyle.colors = ("red", "darkred", "darkolivegreen", "limegreen")
+    label_count = len(years)
+    if len(years) > 30:
+        label_count = 10
+    chart = pygal.StackedBar(dynamic_print_values=True, style=CleanStyle,
+        width=1000, height=500, x_labels_major_count=label_count,
+        show_minor_x_labels=False, x_label_rotation=20)
+    #chart.title = "Preservation by Year"
+    chart.x_title = "Year"
+    #chart.y_title = "Count"
+    chart.x_labels = [str(y['year']) for y in years]
+    chart.add('None', [y['none'] for y in years])
+    chart.add('Shadow', [y['shadows_only'] for y in years])
+    chart.add('Dark', [y['dark'] for y in years])
+    chart.add('Bright', [y['bright'] for y in years])
+    return chart
+
+def preservation_by_volume_histogram(rows: List[Dict]) -> pygal.Graph:
+    """
+    Note: this returns a raw pygal chart; it does not render it to SVG/PNG
+    """
+
+    volumes = sorted(rows, key=lambda x: x['volume'])
+
+    CleanStyle.colors = ("red", "darkred", "darkolivegreen", "limegreen")
+    label_count = len(volumes)
+    if len(volumes) >= 30:
+        label_count = 10
+    chart = pygal.StackedBar(dynamic_print_values=True, style=CleanStyle,
+        width=1000, height=500, x_labels_major_count=label_count,
+        show_minor_x_labels=False, x_label_rotation=20)
+    #chart.title = "Preservation by Year"
+    chart.x_title = "Volume"
+    #chart.y_title = "Count"
+    chart.x_labels = [str(y['volume']) for y in volumes]
+    chart.add('None', [y['none'] for y in volumes])
+    chart.add('Shadow', [y['shadows_only'] for y in volumes])
+    chart.add('Dark', [y['dark'] for y in volumes])
+    chart.add('Bright', [y['bright'] for y in volumes])
+    return chart