add legend to hoverscatter

voting_lib/voting_analysis.py

@@ -7,6 +7,7 @@ from itertools import product
 import matplotlib.pyplot as plt
 import pandas as pd
 import seaborn as sn
+import re
 
 def train_model(X, grid_h, grid_w, radius, step, ep):
 
@@ -131,12 +132,18 @@ def compute_heatmap(weight, grid_height, grid_width):
 
     return heatmap
 
-def plot_hoverscatter(x, y, labels, colors, cmap = plt.cm.RdYlGn):
+def plot_hoverscatter(x, y, categories, hover_labels, colors, cmap = plt.cm.RdYlGn):
     fig, ax = plt.subplots()
     ANNOTATION_DISTANCE = 5
     TRANSPARENCY = 0.8
     scatterplot = plt.scatter(x,y,c=colors, s=5, cmap=cmap)
 
+    handles, labels = scatterplot.legend_elements(prop="colors", alpha=0.6)
+    print(labels[0])
+    cat = list(map(lambda l: categories[int(re.sub(r'([^\d]+)', "", l))], labels))
+    
+    legend = ax.legend(handles, cat, loc="upper right", title="Sizes")
+
     annot = ax.annotate("", xy=(0,0), 
                         xytext=(ANNOTATION_DISTANCE, ANNOTATION_DISTANCE),
                         textcoords="offset points",
@@ -147,9 +154,8 @@ def plot_hoverscatter(x, y, labels, colors, cmap = plt.cm.RdYlGn):
         index = ind["ind"][0]
         pos = scatterplot.get_offsets()[index]
         annot.xy = pos
-        text = f'{labels[index]}'
+        text = f'{hover_labels[index]}'
         annot.set_text(text)
-        annot.get_bbox_patch().set_facecolor(cmap(colors[index]))
         annot.get_bbox_patch().set_alpha(TRANSPARENCY)
 
     def hover(event):
@@ -180,7 +186,7 @@ def plot_mps(names, xs, ys, party_affiliation, randomize_positions=True):
         ys_disp = ys
     
     parties = party_index_mapping[party_ids]
-    plot_hoverscatter(xs_disp, ys_disp, names + " (" + parties + ")", party_ids)
+    plot_hoverscatter(xs_disp, ys_disp, party_index_mapping, names + " (" + parties + ")", party_ids)
 
 def calc_party_pos(members_of_parliament, party_affiliation):
     party_index_mapping, party_ids = np.unique(party_affiliation, return_inverse=True)