feat: implement DTW comparison, add data segmentation and persistence, and update QML UI for file imports and graphing.

src/pygui/backend/visualization/wafer_map_item.py

@@ -47,6 +47,9 @@ class WaferMapItem(QQuickPaintedItem):
     colorsChanged   = Signal()
     shapeChanged    = Signal()
     sizeChanged     = Signal()
+    thicknessChanged = Signal()
+    showThicknessChanged = Signal()
+
 
     def __init__(self, parent=None):
         super().__init__(parent)
@@ -59,6 +62,9 @@ class WaferMapItem(QQuickPaintedItem):
         self._show_labels: bool = True
         self._shape: str = "round"
         self._size: float = 300.0
+        self._thickness_data: list[float] = []
+        self._show_thickness: bool = False
+        self._thickness_heatmap:QImage | None = None
 
         # Dark-theme color defaults (match Theme.qml tokens)
         self._ring_color     = QColor("#2A3441")   # waferRingColor  (toneBorder)
@@ -183,6 +189,27 @@ class WaferMapItem(QQuickPaintedItem):
         self._rebuild()
         self.sizeChanged.emit()
 
+    @Property("QVariantList", notify=thicknessChanged)
+    def thicknessData(self) -> list:
+        return self._thickness_data
+
+    @thicknessData.setter
+    def thicknessData(self, val:list) -> None:
+        self._thickness_data = list(val or [])
+        self._rebuild_thickness()
+        self._thicknessChanged.emit()
+        self.update
+
+    @property(bool, notify=showThicknessChanged)
+    def showThickness(self) -> bool:
+        return self._show_thickness
+
+    @showThickness.setter
+    def showThickness(self, val: bool) -> None:
+        self._show_thickness = bool(val)
+        self.showThicknessChanged.emit()
+        self.update()
+
     # Colour properties — QML can bind these to Theme tokens
     @Property(QColor, notify=colorsChanged)
     def ringColor(self) -> QColor: return self._ring_color
@@ -225,6 +252,25 @@ class WaferMapItem(QQuickPaintedItem):
                 return idx
         return -1
 
+    @Slot(str, result=bool)
+    def export_image(self, file_path: str) -> bool:
+        """Export the current wafer map rendering to a PNG file
+
+        Args:
+            file_pat: Absolute path for the output PNG.
+
+        Returns:
+        True on success, False on failure
+        """
+        if not file_path:
+            return False
+        try:
+            image = self.grabToImage()
+            image.save(file_path, "PNG")
+            return True
+        except Exception as e:
+            log.error("Export failed: %s", e)
+            return False
     # ── internal ─────────────────────────────────────────────────────────
 
     def _on_resize(self) -> None:
@@ -360,6 +406,12 @@ class WaferMapItem(QQuickPaintedItem):
                               cy - self._heatmap.height() // 2, self._heatmap)
             painter.setOpacity(1.0)
 
+        if self._show_thickness and self._thickness_heatmap:
+            painter.setOpacity(0.4)
+            painter.drawImage(cx - self._thickness_heatmap.width() // 2,
+            cy - self._thickness_heatmap.height()//2, self._thickness_heatmap)
+            painter.setOpacity(1.0)
+
         self._paint_markers(painter)
 
     def _paint_template(self, painter: QPainter, cx: int, cy: int, r_px: int) -> None: