From dad3191ce9173f8a1d2b1be60bc6e3542f80e648 Mon Sep 17 00:00:00 2001
From: Théo de la Hogue
Date: Fri, 20 May 2022 15:41:13 +0200
Subject: Adding down sampling features.

---
 src/argaze/DataStructures.py                   | 10 +++++++++-
 src/argaze/utils/export_tobii_segment_plots.py | 18 ++++++++++--------
 2 files changed, 19 insertions(+), 9 deletions(-)

diff --git a/src/argaze/DataStructures.py b/src/argaze/DataStructures.py
index f66ad78..637a007 100644
--- a/src/argaze/DataStructures.py
+++ b/src/argaze/DataStructures.py
@@ -109,11 +109,19 @@ class TimeStampedBuffer(collections.OrderedDict):
         except:
             raise RuntimeError(f'Can\' write {filepath}')
 
-    def plot(self, names=[], colors=[], split={}):
+    def plot(self, names=[], colors=[], split={}, samples=None):
 
         df = self.as_dataframe(split=split)
         legend_patches = []
 
+        # decimate data
+        if samples != None:
+
+            if samples < len(df):
+
+                step = int(len(df) / samples) + 1
+                df = df.iloc[::step, :]
+
         for name, color in zip(names, colors):
 
             markerline, stemlines, baseline = mpyplot.stem(df.index, df[name])
diff --git a/src/argaze/utils/export_tobii_segment_plots.py b/src/argaze/utils/export_tobii_segment_plots.py
index 359748e..d28bafb 100644
--- a/src/argaze/utils/export_tobii_segment_plots.py
+++ b/src/argaze/utils/export_tobii_segment_plots.py
@@ -58,13 +58,15 @@ def main():
             print(f'\t{name}: {len(tobii_segment_data[name])} data')
 
         # Edit figure
-        figure = mpyplot.figure(figsize=(4 * tobii_segment_video.get_duration() / 1e6, 35))
+        figure_width = min( 4 * tobii_segment_video.get_duration() / 1e6, 56) # maximal width to display: 56 inches at 144 dpi < 2^16 pixels
+        data_sample = 8064 # 56 inches * 144 dpi = 8064 data can be displayed at max
+        figure = mpyplot.figure(figsize=(figure_width, 35), dpi=144)
 
         # Plot pupil diameter data
         subplot = figure.add_subplot(711)
         subplot.set_title('Pupil diameter', loc='left')
         subplot.set_ylim(0, 10)
-        patches = tobii_segment_data['PupilDiameter'].plot(names=['value'], colors=['#FFD800'])
+        patches = tobii_segment_data['PupilDiameter'].plot(names=['value'], colors=['#FFD800'], samples=data_sample)
         subplot.legend(handles=patches, loc='upper left')
 
         # Annotate events
@@ -80,38 +82,38 @@ def main():
         subplot = figure.add_subplot(712)
         subplot.set_title('Pupil center', loc='left')
         subplot.set_ylim(-40, -20)
-        patches = tobii_segment_data['PupilCenter'].plot(names=['x','y','z'], colors=['#276FB6','#9427B6','#888888'], split={'value':['x','y','z']})
+        patches = tobii_segment_data['PupilCenter'].plot(names=['x','y','z'], colors=['#276FB6','#9427B6','#888888'], split={'value':['x','y','z']}, samples=data_sample)
         subplot.legend(handles=patches, loc='upper left')
 
         # Plot gaze position data
         subplot = figure.add_subplot(713)
         subplot.set_title('Gaze position', loc='left')
         subplot.set_ylim(0., 1.)
-        patches = tobii_segment_data['GazePosition'].plot(names=['x','y'], colors=['#276FB6','#9427B6'], split={'value':['x','y']})
+        patches = tobii_segment_data['GazePosition'].plot(names=['x','y'], colors=['#276FB6','#9427B6'], split={'value':['x','y']}, samples=data_sample)
         subplot.legend(handles=patches, loc='upper left')
 
         # Plot gaze direction data
         subplot = figure.add_subplot(714)
         subplot.set_title('Gaze direction', loc='left')
-        patches = tobii_segment_data['GazeDirection'].plot(names=['x','y','z'], colors=['#276FB6','#9427B6','#888888'], split={'value':['x','y','z']})
+        patches = tobii_segment_data['GazeDirection'].plot(names=['x','y','z'], colors=['#276FB6','#9427B6','#888888'], split={'value':['x','y','z']}, samples=data_sample)
         subplot.legend(handles=patches, loc='upper left')
 
         # Plot gaze direction data
         subplot = figure.add_subplot(715)
         subplot.set_title('Gaze position 3D', loc='left')
-        patches = tobii_segment_data['GazePosition3D'].plot(names=['x','y','z'], colors=['#276FB6','#9427B6','#888888'], split={'value':['x','y','z']})
+        patches = tobii_segment_data['GazePosition3D'].plot(names=['x','y','z'], colors=['#276FB6','#9427B6','#888888'], split={'value':['x','y','z']}, samples=data_sample)
         subplot.legend(handles=patches, loc='upper left')
 
         # Plot accelerometer data
         subplot = figure.add_subplot(716)
         subplot.set_title('Accelerometer', loc='left')
-        patches = tobii_segment_data['Accelerometer'].plot(names=['x','y','z'], colors=['#276FB6','#9427B6','#888888'], split={'value':['x','y','z']})
+        patches = tobii_segment_data['Accelerometer'].plot(names=['x','y','z'], colors=['#276FB6','#9427B6','#888888'], split={'value':['x','y','z']}, samples=data_sample)
         subplot.legend(handles=patches, loc='upper left')
 
         # Plot accelerometer data
         subplot = figure.add_subplot(717)
         subplot.set_title('Gyroscope', loc='left')
-        patches = tobii_segment_data['Gyroscope'].plot(names=['x','y','z'], colors=['#276FB6','#9427B6','#888888'], split={'value':['x','y','z']})
+        patches = tobii_segment_data['Gyroscope'].plot(names=['x','y','z'], colors=['#276FB6','#9427B6','#888888'], split={'value':['x','y','z']}, samples=data_sample)
         subplot.legend(handles=patches, loc='upper left')
 
         # Export figure
-- 
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