GUI: Beamline busy is in a corner and irrespective of image zoom

gui/src/aaregui/widgets/camera_image.py

@@ -10,7 +10,7 @@ from PySide6.QtGui import (
     QWheelEvent,
     QTransform,
     QCursor,
-    QLinearGradient,
+    QLinearGradient, QFont, QFontMetrics,
 )
 from PySide6.QtWidgets import (
     QMenu,
@@ -116,9 +116,12 @@ class SampleCameraImageLabel(QGraphicsView):
         # Save the current painter state
         painter.save()
 
-        # Set up the text properties
-        font = painter.font()
-        font.setPointSize(24)
+        # Reset the painter to work in device coordinates (viewport coordinates)
+        painter.resetTransform()
+
+        # Set up the text properties with fixed font size
+        font = QFont()
+        font.setPointSize(24)  # Fixed size in points
         font.setBold(True)
         painter.setFont(font)
 
@@ -128,19 +131,19 @@ class SampleCameraImageLabel(QGraphicsView):
 
         text = "BEAMLINE BUSY"
 
-        # Calculate text dimensions
-        font_metrics = painter.fontMetrics()
+        # Calculate text dimensions using the fixed font
+        font_metrics = QFontMetrics(font)
         text_rect = font_metrics.boundingRect(text)
 
-        # Position the text in the center of the view
-        view_rect = self.viewport().rect()
-        scene_center = self.mapToScene(view_rect.center())
+        # Fixed position in viewport coordinates (50, 50 from top-left corner)
+        position_x = 50  # 50 pixels from left edge
+        position_y = 50  # 50 pixels from top edge
 
-        # Create a rectangle for the background
+        # Create a rectangle for the background in viewport coordinates
         padding = 20
         bg_rect = QRect(
-            int(scene_center.x() - text_rect.width() / 2 - padding),
-            int(scene_center.y() - text_rect.height() / 2 - padding),
+            position_x - padding,
+            position_y - padding,
             text_rect.width() + 2 * padding,
             text_rect.height() + 2 * padding
         )
@@ -148,11 +151,11 @@ class SampleCameraImageLabel(QGraphicsView):
         # Draw the background rectangle
         painter.drawRoundedRect(bg_rect, 10, 10)
 
-        # Draw the text
+        # Draw the text at fixed viewport position
         painter.setPen(QPen(QColor(255, 255, 255), 2, Qt.PenStyle.SolidLine))
         text_pos = QPoint(
-            int(scene_center.x() - text_rect.width() / 2),
-            int(scene_center.y() + text_rect.height() / 4)
+            position_x,
+            position_y + font_metrics.ascent()
         )
         painter.drawText(text_pos, text)