[WIP] Contrast reserve

python/PiFinder/ui/object_details.py

@@ -6,6 +6,7 @@
 
 """
 
+import pydeepskylog as pds
 from PiFinder import cat_images
 from PiFinder.ui.marking_menus import MarkingMenuOption, MarkingMenu
 from PiFinder.obj_types import OBJ_TYPES
@@ -46,6 +47,7 @@ class UIObjectDetails(UIModule):
     def __init__(self, *args, **kwargs):
         super().__init__(*args, **kwargs)
 
+        self.contrast = None
         self.screen_direction = self.config_object.get_option("screen_direction")
         self.mount_type = self.config_object.get_option("mount_type")
         self.object = self.item_definition["object"]
@@ -71,7 +73,7 @@ def __init__(self, *args, **kwargs):
             ),
         )
 
-        # Used for displaying obsevation counts
+        # Used for displaying observation counts
         self.observations_db = ObservationsDatabase()
 
         self.simpleTextLayout = functools.partial(
@@ -120,8 +122,15 @@ def _layout_designator(self):
         designator_color = 255
         if not self.object.last_filtered_result:
             designator_color = 128
+
+        # layout the name - contrast reserve line
+        space_calculator = SpaceCalculatorFixed(14)
+
+        _, typeconst = space_calculator.calculate_spaces(
+            self.object.display_name, self.contrast
+        )
         return self.simpleTextLayout(
-            self.object.display_name,
+            typeconst,
             font=self.fonts.large,
             color=self.colors.get(designator_color),
         )
@@ -227,6 +236,44 @@ def update_object_info(self):
             burn_in=self.object_display_mode in [DM_POSS, DM_SDSS],
         )
 
+        # Calculate contrast reserve
+        # TODO: Get the SQM from the shared state
+        # sqm = self.shared_state.get_sky_brightness()
+        sqm = 20.15
+        # Check if a telescope and eyepiece are set
+        if (
+            self.config_object.equipment.active_eyepiece is None
+            or self.config_object.equipment.active_eyepiece is None
+        ):
+            self.contrast = ""
+        else:
+            # Calculate contrast reserve.
+            # Get the used magnification from the equipment configuration
+            magnification = self.config_object.equipment.calc_magnification(
+                self.config_object.equipment.active_telescope,
+                self.config_object.equipment.active_eyepiece,
+            )
+            if self.object.mag_str == "-":
+                self.contrast = ""
+            else:
+                try:
+                    # Calculate the contrast reserve.
+                    # The object diameters are given in arc minutes, but expected in arc seconds.
+                    self.contrast = pds.contrast_reserve(
+                        sqm=sqm,
+                        telescope_diameter=self.config_object.equipment.active_telescope.aperture_mm,
+                        magnification=magnification,
+                        magnitude=float(self.object.mag_str),
+                        object_diameter1=float(self.object.size) * 60.0,
+                        object_diameter2=float(self.object.size) * 60.0,
+                    )
+                except Exception:
+                    self.contrast = ""
+        try:
+            self.contrast = f"{self.contrast: .2f}"
+        except Exception:
+            self.contrast = ""
+
     def active(self):
         self.activation_time = time.time()
 
@@ -434,7 +481,7 @@ def mm_cancel(self, _marking_menu, _menu_item) -> bool:
 
     def mm_align(self, _marking_menu, _menu_item) -> bool:
         """
-        Called from marking menu to align on curent object
+        Called from marking menu to align on current object
         """
         self.message("Aligning...", 0.1)
         if align_on_radec(