From 97a0d7117cb8f994e44e6f2e1644bdd404b6529a Mon Sep 17 00:00:00 2001
From: Benjamin Bertrand <lafrite@poneyworld.net>
Date: Thu, 17 Nov 2016 17:58:01 +0300
Subject: [PATCH] add radar_plot

---
 notes_tools/__init__.py        |  2 +-
 notes_tools/tools/__init__.py  |  1 +
 notes_tools/tools/plottings.py | 77 ++++++++++++++++++++++++++++++++++
 3 files changed, 79 insertions(+), 1 deletion(-)
 create mode 100644 notes_tools/tools/plottings.py

diff --git a/notes_tools/__init__.py b/notes_tools/__init__.py
index ab2f3a6..9500821 100644
--- a/notes_tools/__init__.py
+++ b/notes_tools/__init__.py
@@ -2,7 +2,7 @@
 # encoding: utf-8
 
 from .generate_bilan import generate_bilan
-from .tools import extract_flat_marks, get_class_ws, digest_flat_df, students_pov
+from .tools import extract_flat_marks, get_class_ws, digest_flat_df, students_pov, radar_graph
 
 # -----------------------------
 # Reglages pour 'vim'
diff --git a/notes_tools/tools/__init__.py b/notes_tools/tools/__init__.py
index 9c05167..a8609cb 100644
--- a/notes_tools/tools/__init__.py
+++ b/notes_tools/tools/__init__.py
@@ -5,6 +5,7 @@
 from .extract import extract_flat_marks, get_class_ws
 from .df_marks_manip import digest_flat_df, students_pov
 from .eval_tools import select_eval, get_present_absent, keep_only_presents
+from .plottings import radar_graph
 
 
 
diff --git a/notes_tools/tools/plottings.py b/notes_tools/tools/plottings.py
new file mode 100644
index 0000000..57645b5
--- /dev/null
+++ b/notes_tools/tools/plottings.py
@@ -0,0 +1,77 @@
+#!/usr/bin/env python
+# encoding: utf-8
+
+import numpy as np
+import matplotlib.pyplot as plt
+from matplotlib.path import Path
+from matplotlib.spines import Spine
+from matplotlib.projections.polar import PolarAxes
+from matplotlib.projections import register_projection
+
+def _radar_factory(num_vars):
+    theta = 2*np.pi * np.linspace(0, 1-1./num_vars, num_vars)
+    theta += np.pi/2
+
+    def unit_poly_verts(theta):
+        x0, y0, r = [0.5] * 3
+        verts = [(r*np.cos(t) + x0, r*np.sin(t) + y0) for t in theta]
+        return verts
+
+    class RadarAxes(PolarAxes):
+        name = 'radar'
+        RESOLUTION = 1
+
+        def fill(self, *args, **kwargs):
+            closed = kwargs.pop('closed', True)
+            return super(RadarAxes, self).fill(closed=closed, *args, **kwargs)
+
+        def plot(self, *args, **kwargs):
+            lines = super(RadarAxes, self).plot(*args, **kwargs)
+            for line in lines:
+                self._close_line(line)
+
+        def _close_line(self, line):
+            x, y = line.get_data()
+            # FIXME: markers at x[0], y[0] get doubled-up
+            if x[0] != x[-1]:
+                x = np.concatenate((x, [x[0]]))
+                y = np.concatenate((y, [y[0]]))
+                line.set_data(x, y)
+
+        def set_varlabels(self, labels):
+            self.set_thetagrids(theta * 180/np.pi, labels)
+
+        def _gen_axes_patch(self):
+            verts = unit_poly_verts(theta)
+            return plt.Polygon(verts, closed=True, edgecolor='k')
+
+        def _gen_axes_spines(self):
+            spine_type = 'circle'
+            verts = unit_poly_verts(theta)
+            verts.append(verts[0])
+            path = Path(verts)
+            spine = Spine(self, spine_type, path)
+            spine.set_transform(self.transAxes)
+            return {'polar': spine}
+
+    register_projection(RadarAxes)
+    return theta
+
+def radar_graph(labels = [], values = [], optimum = []):
+    N = len(labels) 
+    theta = _radar_factory(N)
+    max_val = max(max(optimum), max(values))
+    fig = plt.figure()
+    ax = fig.add_subplot(1, 1, 1, projection='radar')
+    ax.plot(theta, values, color='k')
+    ax.plot(theta, optimum, color='r')
+    ax.set_varlabels(labels)
+    plt.show()
+    #plt.savefig("radar.png", dpi=100)
+
+
+
+# -----------------------------
+# Reglages pour 'vim'
+# vim:set autoindent expandtab tabstop=4 shiftwidth=4:
+# cursor: 16 del