diff --git a/exp/annotations.py b/exp/annotations.py
new file mode 100644
--- /dev/null
+++ b/exp/annotations.py
@@ -0,0 +1,46 @@
+import sys
+sys.path.append("../src")
+
+import gzip
+import json
+from typing import MutableMapping
+
+from analyzer.epoint import EPoint
+
+
+class DataFile(MutableMapping):
+	"""self._data: {filename: [EPoint,EPoint,EPoint,EPoint]}"""
+	def __init__(self,filename):
+		self.filename=filename
+		try:
+			with gzip.open(filename,mode="rt",encoding="utf8") as f:
+				self._data=json.load(f,object_hook=self.deserialize)
+		except OSError:
+			self._data=dict()
+
+	def save(self):
+		with gzip.open(self.filename,mode="wt",encoding="utf8") as f:
+			json.dump(self._data,f,default=self.serialize,indent="\t")
+
+	def serialize(self,obj):
+		if isinstance(obj,EPoint):
+			return {"type": "EPoint", "val": [obj.x,obj.y]}
+		raise TypeError(obj)
+
+	def deserialize(self,obj):
+		if obj.get("type")!="EPoint": return obj
+		return EPoint(*obj["val"])
+
+	def __getitem__(self, key): return self._data[key]
+	def __setitem__(self, key, val): self._data[key]=val
+	def __delitem__(self, key): del self._data[key]
+	def __iter__(self): return iter(self._data)
+	def __len__(self): return len(self._data)
+
+
+def computeBoundingBox(corners):
+	x1=min(p.x for p in corners)
+	x2=max(p.x for p in corners)
+	y1=min(p.y for p in corners)
+	y2=max(p.y for p in corners)
+	return (x1,y1,x2,y2)
diff --git a/exp/color_sampler.py b/exp/color_sampler.py
--- a/exp/color_sampler.py
+++ b/exp/color_sampler.py
@@ -2,16 +2,13 @@ import sys
 sys.path.append("../src")
 
 import os
-import json
-import gzip
-from collections.abc import MutableMapping
 import tkinter as tk
 from tkinter import LEFT,N,S,E,W
 from colorsys import rgb_to_hsv
 
 from PIL import Image,ImageTk
 
-from analyzer.epoint import EPoint
+from annotations import DataFile
 from analyzer.corners import Corners
 
 
@@ -144,36 +141,6 @@ class Sampler:
 		return self._corners[self.m]
 
 
-class DataFile(MutableMapping):
-	"""self._data: {filename: [EPoint,EPoint,EPoint,EPoint]}"""
-	def __init__(self,filename):
-		self.filename=filename
-		try:
-			with gzip.open(filename,mode="rt",encoding="utf8") as f:
-				self._data=json.load(f,object_hook=self.deserialize)
-		except OSError:
-			self._data=dict()
-
-	def save(self):
-		with gzip.open(self.filename,mode="wt",encoding="utf8") as f:
-			json.dump(self._data,f,default=self.serialize,indent="\t")
-
-	def serialize(self,obj):
-		if isinstance(obj,EPoint):
-			return {"type": "EPoint", "val": [obj.x,obj.y]}
-		raise TypeError(obj)
-
-	def deserialize(self,obj):
-		if obj.get("type")!="EPoint": return obj
-		return EPoint(*obj["val"])
-
-	def __getitem__(self, key): return self._data[key]
-	def __setitem__(self, key, val): self._data[key]=val
-	def __delitem__(self, key): del self._data[key]
-	def __iter__(self): return iter(self._data)
-	def __len__(self): return len(self._data)
-
-
 if __name__=="__main__":
 	dirname=sys.argv[1]
 	annotations=sys.argv[2]
diff --git a/exp/createsamples.py b/exp/createsamples.py
--- a/exp/createsamples.py
+++ b/exp/createsamples.py
@@ -9,8 +9,7 @@ import PIL.ImageDraw
 import PIL
 
 from diagram import createDiagram
-from color_sampler import DataFile
-
+from annotations import DataFile
 
 finalPosCount=5000
 empty=True