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-rw-r--r--host/inter/drawable.py6
1 files changed, 6 insertions, 0 deletions
diff --git a/host/inter/drawable.py b/host/inter/drawable.py
index b7ffbc02..26628f40 100644
--- a/host/inter/drawable.py
+++ b/host/inter/drawable.py
@@ -164,3 +164,9 @@ class DrawableCanvas(Tkinter.Canvas):
return [ (i[0] * self.__scale + self.__xoffset,
-i[1] * self.__scale + self.__yoffset) for i in args ]
+ def screen_coord (self, screen):
+ """Return drawable coordinates corresponding to the given screen
+ coordinates."""
+ return ((self.canvasx (screen[0]) - self.__xoffset) / self.__scale,
+ -(self.canvasy (screen[1]) - self.__yoffset) / self.__scale)
+