fix graph and white background added

python_app/gui/controllers/renderers/bscan.py

@@ -4,14 +4,13 @@ from __future__ import annotations
 
 from collections import deque
 
-from PyQt6.QtCore import QRectF
 import numpy as np
 import pyqtgraph as pg
 
 from python_app.models.collection_identity import collection_key
 from python_app.models.dataset_model import ResultCollection
 from python_app.models.gui_profile_schema import GuiBscanStateModel
-from python_app.gui.controllers.renderers.common import build_lut, create_plot
+from python_app.gui.controllers.renderers.common import build_lut, create_plot, image_rect
 
 
 def _result_tail(
@@ -109,16 +108,18 @@ def bscan_levels(sweeps: np.ndarray, axis_mode: str) -> tuple[float, float]:
     return -max_abs, max_abs
 
 
+_TITLE = "B-scan S21"
+
+
 class BscanRenderer:
     """Own the heatmap and its per-combination arrays; input history stays external."""
 
     def __init__(self) -> None:
-        self.widget = create_plot()
+        self.widget = create_plot(_TITLE)
         self.widget.setLabel("bottom", "Sweep #")
         self.widget.setLabel("left", "Range", units="m")
         item = self.widget.getPlotItem()
         assert item is not None
-        item.getViewBox().invertY(False)
         item.getViewBox().enableAutoRange(x=False, y=False)
         self.image = pg.ImageItem(axisOrder="row-major")
         item.addItem(self.image)
@@ -139,24 +140,28 @@ class BscanRenderer:
         history = self.history_by_combo.get(key) if key is not None else None
         depth = self.depth_axis_by_combo.get(key) if key is not None else None
         if not history or depth is None:
-            self.image.clear()
+            self._show_empty()
             return False
         sweeps = apply_mean_ascan_subtraction(history, enabled=settings.subtract_mean_ascan)
-        depth_min, depth_max = float(np.min(depth)), float(np.max(depth))
         count = sweeps.shape[0]
+        rect = image_rect(np.arange(1, count + 1), depth)
         self.image.setImage(sweeps.T, autoLevels=False)
-        self.image.setRect(QRectF(.5, depth_min, float(count), max(depth_max - depth_min, 1e-6)))
+        self.image.setRect(rect)
         self.image.setLookupTable(bscan_lookup_table(settings.axis))
         self.image.setLevels(bscan_levels(sweeps, settings.axis))
         item = self.widget.getPlotItem()
         assert item is not None
-        item.getViewBox().setRange(xRange=(.5, .5 + count), yRange=(depth_min, depth_max), padding=.02)
+        item.getViewBox().setRange(rect, padding=.02)
         assert key is not None
-        self.widget.setTitle(f"B-scan S21 in{key[0]}/out{key[1]} | sweeps={count}")
+        self.widget.setTitle(f"{_TITLE} in{key[0]}/out{key[1]} | sweeps={count}")
         return True
 
     def clear(self) -> None:
         self.history_by_combo.clear()
         self.depth_axis_by_combo.clear()
         self.signature = None
+        self._show_empty()
+
+    def _show_empty(self) -> None:
         self.image.clear()
+        self.widget.setTitle(_TITLE)