DAQLib: Introduce a dedicated structure for Diffraction geometry

gui/src/aaregui/main_window.py

@@ -10,6 +10,7 @@ from PySide6.QtWidgets import (
     QMessageBox,
     QApplication, )
 from aaredaqlib.coordinate import Coordinate, SmargonCoordinate
+from aaredaqlib.diffraction_geometry import DiffractionGeometry
 from aaredaqlib.models import SampleShortInfoList, TokenData
 from aaredaqlib.sample_geometry import SampleGeometryModel
 
@@ -49,6 +50,14 @@ class MainWindow(QMainWindow):
         top_widget_layout = QHBoxLayout(top_widget)
         top_widget.setLayout(top_widget_layout)
 
+        diffraction = DiffractionGeometry(
+            energy_keV=12.4,
+            dtz_mm=100,
+            detector_size_pxl=(1553,1630),
+            pixel_size_mm=0.150, #PILATUS 4
+            beam_center_pxl=(750, 750)
+        )
+
         geom = SampleGeometryModel(beam_location_pxl=Coordinate(x=1000,y=1000),
                                    pixel_in_mm=0.001,
                                    aerotech=Coordinate(),