add: color calculation in server

server/map/get_markers.py

@@ -84,3 +84,16 @@ def get_all_markers(self, cursor, waterBodyName):
 
     # Write marker data to response object
     self.wfile.write(marker_data.encode('utf-8'))
+
+def calculateColor(thickness: int):  # NB not final colors nor ranges
+    if 0 < thickness < 4:
+        return 0xFFff0000  # Red
+    elif 4 < thickness < 6:
+        return 0xFFff9400  # Orange
+    elif 6 < thickness < 8:
+        return 0xFFb1ff00  # Green
+    elif thickness > 8:
+        return 0xFF00d6ff  # Blue
+    else:
+        return 0xFF939393  # Gray
+