Fix heatmap orientation by transposing data for PyQtGraph

Updated heatmap rendering in Heatmap class to transpose data before displaying with PyQtGraph, ensuring correct axis orientation. Also bumped version to 1.2.5 in pyproject.toml and __init__.py.

Author: caidish

pyproject.toml

@@ -10,7 +10,7 @@ where = ["src"]
 
 [project]
 name = "qmeasure"
-version = "1.2.4"
+version = "1.2.5"
 description = "Measurement code for condensed matter groups at UW based on QCoDeS."
 readme = {file = "README.md", content-type = "text/markdown"}
 license = "GPL-3.0-or-later"

src/measureit/__init__.py

@@ -48,7 +48,7 @@
 try:
     __version__ = metadata.version("qmeasure")
 except metadata.PackageNotFoundError:  # pragma: no cover - dev installs
-    __version__ = "1.2.4"
+    __version__ = "1.2.5"
 
 
 # Display data directory info on first import (only in interactive sessions)

src/measureit/visualization/heatmap_thread.py

@@ -359,7 +359,8 @@ def create_figs(self):
             self._ensure_surface(self.sweep.heatmap_ind)
             self.heatmap_data = self.param_surfaces[self.sweep.heatmap_ind]["data"]
             # Set up the initial image with proper scaling
-            self.image_item.setImage(self.heatmap_data)
+            # Transpose: our data is [outer, inner] but PyQtGraph uses [x, y] order
+            self.image_item.setImage(self.heatmap_data.T)
 
             # Set the coordinate transformation for proper axis scaling
             # Use setRect as the primary method (more reliable than transform)
@@ -546,7 +547,8 @@ def update_heatmap(self):
             current_idx = getattr(self.sweep, "heatmap_ind", 0)
             self._ensure_surface(current_idx)
             self.heatmap_data = self.param_surfaces[current_idx]["data"]
-            self.image_item.setImage(self.heatmap_data)
+            # Transpose: our data is [outer, inner] but PyQtGraph uses [x, y] order
+            self.image_item.setImage(self.heatmap_data.T)
 
             # Set color levels: auto or leave to user via histogram LUT
             if self._auto_levels_enabled:
@@ -667,7 +669,8 @@ def _on_param_selected(self, combo_index: int):
             # Refresh the image to show the newly selected surface
             view_box = self.plot_item.getViewBox()
             view_range = view_box.viewRange()
-            self.image_item.setImage(self.heatmap_data)
+            # Transpose: our data is [outer, inner] but PyQtGraph uses [x, y] order
+            self.image_item.setImage(self.heatmap_data.T)
 
             # Re-apply coordinate transformation after setImage (critical for correct axis scaling)
             try: