no direct slice indexing

plate-tool-eframe/src/plate.rs

@@ -148,9 +148,10 @@ fn calculate_shading_for_wells(
                     x.volume += 5.0;
                     x.color = PALETTE.get_ordered(transfer.id, ordered_ids);
                 } else {
-                    well_infos
-                        [(well.row - 1) as usize * columns as usize + (well.col - 1) as usize] =
-                        Some(WellInfo::new(
+                    if let Some(mut wi) = well_infos.get_mut(
+                        (well.row - 1) as usize * columns as usize + (well.col - 1) as usize,
+                    ) {
+                        *wi = Some(WellInfo::new(
                             5.0,
                             PALETTE.get_ordered(transfer.id, ordered_ids),
                         ));
@@ -158,6 +159,7 @@ fn calculate_shading_for_wells(
                 }
             }
         }
+    }
 
     well_infos
 }
@@ -276,7 +278,9 @@ fn add_plate_sub(
         };
         if let Some(wells) = current_transfer_wells {
             for w in wells {
-                let well_info = &mut well_infos[(w.0 - 1) * columns as usize + (w.1 - 1)];
+                if let Some(mut well_info) =
+                    well_infos.get_mut((w.0 - 1) * columns as usize + (w.1 - 1))
+                {
                     let volume = well_info.map(|x| x.volume).unwrap_or(0.0)
                         + current_transfer_state
                             .and_then(|x| x.lock().ok())
@@ -289,6 +293,7 @@ fn add_plate_sub(
                     })
                 }
             }
+        }
         well_infos
     };