bh: thuban/Thuban/UI viewport.py,1.17,1.18

[cvs@intevation.de]

Author: bh

Update of /thubanrepository/thuban/Thuban/UI
In directory doto:/tmp/cvs-serv30330/Thuban/UI

Modified Files:
	viewport.py 
Log Message:
* Thuban/UI/viewport.py (ViewPort.VisibleExtent): New.  Return the
visible extent of the map in projected coordinates

* test/test_viewport.py (SimpleViewPortTest.test_default_size)
(SimpleViewPortTest.test_init_with_size): Add some VisibleExtent()
tests.
(SimpleViewPortTest.test_visible_extent): New. The real test for
VisibleExtent()


Index: viewport.py
===================================================================
RCS file: /thubanrepository/thuban/Thuban/UI/viewport.py,v
retrieving revision 1.17
retrieving revision 1.18
diff -u -d -r1.17 -r1.18
--- viewport.py	16 Jul 2004 19:47:29 -0000	1.17
+++ viewport.py	22 Jul 2004 13:07:52 -0000	1.18
@@ -431,6 +431,17 @@
         offx, offy = self.offset
         return ((x - offx) / self.scale, (offy - y) / self.scale)
 
+    def VisibleExtent(self):
+        """Return the extent of the visible region in projected coordinates
+
+        The return values is a tuple (llx, lly, urx, ury) describing the
+        region.
+        """
+        width, height = self.GetPortSizeTuple()
+        llx, lly = self.win_to_proj(0, height)
+        urx, ury = self.win_to_proj(width, 0)
+        return (llx, lly, urx, ury)
+
     def FitRectToWindow(self, rect):
         """Fit the rectangular region given by rect into the window.