added reference png export

python_app/gui/controllers/app_window_preprocess_mixin.py

@@ -3,6 +3,7 @@
 from __future__ import annotations
 
 from python_app.gui.preprocess_dialog import PreprocessDialog
+from python_app.gui.trace_png_export import export_trace_png
 from python_app.orchestration.preprocess_assets import (
     PREPROCESS_ASSET_SPECS,
     VISIBLE_PREPROCESS_ASSET_KEYS,
@@ -701,6 +702,12 @@ class AppWindowPreprocessMixin:
                     f"{display_name} sequence completed and saved: set={set_name}, "
                     f"radar_variants={len(saved_sets)} [{saved_summary}]"
                 )
+                self._export_multi_radar_preview_pngs(
+                    session=session,
+                    saved_sets=saved_sets,
+                    kind=kind,
+                    set_name=set_name,
+                )
             else:
                 dialog.set_status(f"{display_name} set saved: {set_name} ({len(collection.traces)} traces)")
                 self._log(f"{display_name} sequence completed and saved: set={set_name}, key={radar_key}")
@@ -708,6 +715,50 @@ class AppWindowPreprocessMixin:
         except Exception as exc:  # noqa: BLE001
             self._show_exception("Failed to save preprocess set", exc)
 
+    def _export_multi_radar_preview_pngs(
+        self,
+        *,
+        session: MultiRadarSequentialCaptureSession,
+        saved_sets: list,
+        kind: str,
+        set_name: str,
+    ) -> None:
+        """Save amplitude/phase PNGs for every captured combo across all radar configs.
+
+        The live preview only shows the last config of each combo, so this persists a
+        graph for the other configs too, under the store's ``preview_png/`` tree. The
+        set is already saved by the time we get here, so any rendering failure is
+        logged but never aborts the save.
+        """
+        channel = preprocess_asset_channel(kind)
+        display_name = preprocess_asset_display_name(kind)
+        # batch.traces and saved_sets are both ordered by the session's radar
+        # variants, so index i refers to the same config in both.
+        saved_count = 0
+        for batch in session.captured_batches():
+            for trace, saved in zip(batch.traces, saved_sets):
+                combo_label = f"input={trace.combo.input} output={trace.combo.output}"
+                try:
+                    png_path = self._store.preview_png_dir(kind, set_name, saved.radar_key) / (
+                        f"i{trace.combo.input}_o{trace.combo.output}.png"
+                    )
+                    export_trace_png(
+                        trace,
+                        png_path,
+                        channel=channel,
+                        title=f"{display_name} | {saved.display_name} | {combo_label}",
+                    )
+                    saved_count += 1
+                except Exception as exc:  # noqa: BLE001
+                    self._log(
+                        f"Failed to save preview PNG for {saved.display_name} ({combo_label}): {exc}"
+                    )
+        if saved_count and saved_sets:
+            png_root = self._store.preview_png_dir(kind, set_name, saved_sets[0].radar_key).parent
+            self._log(
+                f"Saved {saved_count} preview PNG(s) for {len(saved_sets)} radar config(s) under {png_root}"
+            )
+
     def _abort_capture_sequence(self, *, resume_pipeline: bool = True) -> None:
         """Abort active capture session and optionally resume pipeline."""
         if self._capture_session is None: