[ocrfeeder] Center the working page in its area

[Joaquim Manuel Pereira Rocha <jrocha src gnome org>]

commit c00b283812693315ab796061e62e7908bd8e64a6
Author: Joaquim Rocha <me joaquimrocha com>
Date:   Sat Jul 16 23:12:37 2016 +0100

    Center the working page in its area

 src/ocrfeeder/studio/boxesarea.py |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)
---
diff --git a/src/ocrfeeder/studio/boxesarea.py b/src/ocrfeeder/studio/boxesarea.py
index 29c160d..34d89fb 100644
--- a/src/ocrfeeder/studio/boxesarea.py
+++ b/src/ocrfeeder/studio/boxesarea.py
@@ -49,6 +49,8 @@ class BoxesArea(GooCanvas.Canvas):
 
     def __init__(self, image_path):
         GooCanvas.Canvas.__init__(self)
+        self.set_property('anchor', GooCanvas.CanvasAnchorType.CENTER)
+        self.set_property('automatic-bounds', True)
         self.image = GooCanvas.CanvasImage()
         self.frame = []
         self.setBackgroundImage(image_path)
@@ -72,7 +74,6 @@ class BoxesArea(GooCanvas.Canvas):
 
     def __getRectangleFromPoints(self, start_point, end_point):
         start_x, start_y = start_point
-        start_x, start_y = self.convert_from_pixels(start_x, start_y)
         end_x, end_y = end_point
         width = end_x - start_x
         height = end_y - start_y
@@ -212,7 +213,7 @@ class BoxesArea(GooCanvas.Canvas):
         fill_color = self.__rgbaToInteger(self.area_fill_rgba)
         stroke_color = self.__rgbaToInteger(self.area_stroke_rgba)
         self.currently_created_area = Box(fill_color_rgba = fill_color, stroke_color_rgba = stroke_color)
-        x, y = event.x * self.get_scale(), event.y * self.get_scale()
+        x, y = event.x, event.y
         self.currently_created_area.props.x = x
         self.currently_created_area.props.y = y
         self.currently_created_area.start_point = x, y