From 801acc9547f9eae253346c301c0240fa4c4102f2 Mon Sep 17 00:00:00 2001
From: Jan Grewe <jan.grewe@g-node.org>
Date: Fri, 7 Feb 2025 15:56:20 +0100
Subject: [PATCH] [classifier] new classfier widgets for automatic
 classification by size

---
 fixtracks/widgets/classifier.py | 101 ++++++++++++++++++++++++++++++++
 1 file changed, 101 insertions(+)
 create mode 100644 fixtracks/widgets/classifier.py

diff --git a/fixtracks/widgets/classifier.py b/fixtracks/widgets/classifier.py
new file mode 100644
index 0000000..998dfcb
--- /dev/null
+++ b/fixtracks/widgets/classifier.py
@@ -0,0 +1,101 @@
+import logging
+import numpy as np
+
+from PySide6.QtWidgets import QWidget, QVBoxLayout, QSizePolicy, QGraphicsView, QSlider, QPushButton, QLabel
+from PySide6.QtWidgets import QGraphicsScene, QGraphicsEllipseItem, QGraphicsRectItem, QGraphicsLineItem
+from PySide6.QtCore import Qt
+from PySide6.QtGui import QBrush, QColor, QPen, QPainter, QFont
+
+import pyqtgraph as pg
+
+from IPython import embed
+
+class SizeClassifier(QWidget):
+    def __init__(self, parent=None):
+        super().__init__(parent)
+        self._t1_selection = None
+        self._t2_selection = None
+        layout = QVBoxLayout()
+        self._plot_widget = self.setupGraph()
+        layout.addWidget(self._plot_widget)
+        self.setLayout(layout)
+
+    def setupGraph(self):
+        track1_brush = QBrush(QColor.fromString("orange"))
+        track1_brush.color().setAlphaF(0.5)
+        track2_brush = QBrush(QColor.fromString("green"))
+
+        pg.setConfigOptions(antialias=True)
+        plot_widget = pg.GraphicsLayoutWidget(show=False)
+
+        self._t1_selection = pg.LinearRegionItem([100, 200])
+        self._t1_selection.setZValue(-10)  # what is that?
+        self._t1_selection.setBrush(track1_brush)
+        self._t2_selection = pg.LinearRegionItem([300,400])
+        self._t2_selection.setZValue(-10)  # what is that?
+        self._t2_selection.setBrush(track2_brush)
+        return plot_widget
+
+    def estimate_length(self, coords, bodyaxis =None):
+        if bodyaxis is None:
+            bodyaxis = [0, 1, 2, 5]
+        bodycoords = coords[:, bodyaxis, :]
+        dists = np.sum(np.sqrt(np.sum(np.diff(bodycoords, axis=1)**2, axis=2)), axis=1)
+        return dists
+
+    def estimate_histogram(self, dists, min_threshold=1., max_threshold=99.):
+        min_length = np.percentile(dists, min_threshold)
+        max_length = np.percentile(dists, max_threshold)
+        bins = np.linspace(0.5 * min_length, 1.5 * max_length, 100)
+        hist, edges = np.histogram(dists, bins=bins, density=True)
+        return hist, edges
+
+    def setCoordinates(self, coordinates):
+        dists = self.estimate_length(coordinates)
+        n, e = self.estimate_histogram(dists)
+        plot = self._plot_widget.addPlot()
+        bgi = pg.BarGraphItem(x0=e[:-1], x1=e[1:], height=n, pen='w', brush=(0,0,255,150))
+        plot.addItem(bgi)
+        plot.setLabel('left', "prob. density")
+        plot.setLabel('bottom', "bodylength", units="px")
+        plot.addItem(self._t1_selection)
+        plot.addItem(self._t2_selection)
+
+    def selections(self, track1=True):
+        if track1:
+            return self._t1_selection.getRegion()
+        else:
+            return self._t2_selection.getRegion()
+
+
+def main():
+    import pickle
+    from fixtracks.info import PACKAGE_ROOT
+    from PySide6.QtWidgets import QApplication
+
+    datafile = PACKAGE_ROOT / "data/merged_small.pkl"
+    print(datafile)
+    with open(datafile, "rb") as f:
+        df = pickle.load(f)
+
+
+    coords = np.stack(df.keypoints.values,).astype(np.float32)[:,:,:]
+
+    app = QApplication([])
+    window = QWidget()
+    window.setMinimumSize(200, 200)
+    layout = QVBoxLayout()
+    win = SizeClassifier()
+    win.setCoordinates(coords)
+
+    btn = QPushButton("get bounds")
+    btn.clicked.connect(lambda: win.selections())
+
+    layout.addWidget(win)
+    layout.addWidget(btn)
+    window.setLayout(layout)
+    window.show()
+    app.exec()
+
+if __name__ == "__main__":
+    main()
\ No newline at end of file