add average to graph

app/graph.py

@@ -58,9 +58,13 @@ def gen_graph_data(numbers):
     dots = [absolute_to_percentage_position(
         n, scale_base) for n in numbers]
     lines = list(zip(dots, dots[1:]))
+    avg = sum(dots)/len(dots)
+    print(dots)
+    print(avg)
 
     return {
         "dots": dots,
         "lines": lines,
         "scale": scale,
+        "avg": avg,
     }

app/templates/graph.svg

@@ -13,6 +13,7 @@
     {% for n in scale %}
         <line x1="10%" y1="{{ 16.6 * loop.index }}%" x2="96%" y2="{{ 16.6 * loop.index }}%" stroke="#ddd" stroke-width="2px" />
     {% endfor %}
+    <line x1="10%" y1="{{ avg }}%" x2="96%" y2="{{ avg }}%" stroke="#89f393" stroke-width="2px" />
     </g>
     <g class="legend" style="font-size: 0.9em; text-align:right;">
     {% for n in scale | reverse %}