[Bug 425957] [NEW] type mismatch causes chaco examples to fail

[Evan Jeffrey]

Public bug reported:

Binary package hint: python-enable

Running the chaco examples, such as /usr/share/doc/python-
chaco/examples/basic/traits_editor.py fails to display properly and
produces error messages:

Traceback (most recent call last):
  File "/usr/lib/python2.6/dist-packages/enthought/enable/abstract_window.py", line 340, in _paint
    self.component.draw(gc, view_bounds=(0, 0, size[0], size[1]))
  File "/usr/lib/python2.6/dist-packages/enthought/enable/component.py", line 416, in draw
    self._draw(gc, view_bounds, mode)
  File "/usr/lib/python2.6/dist-packages/enthought/enable/component.py", line 718, in _draw
    self._dispatch_draw(layer, bb, view_bounds, mode)
  File "/usr/lib/python2.6/dist-packages/enthought/enable/container.py", line 326, in _dispatch_draw
    component._dispatch_draw(layer, gc, new_bounds, mode)
  File "/usr/lib/python2.6/dist-packages/enthought/enable/component.py", line 747, in _dispatch_draw
    handler(gc, view_bounds, mode)
  File "/usr/lib/python2.6/dist-packages/enthought/enable/component.py", line 844, in _draw_underlay
    underlay.overlay(self, gc, view_bounds, mode)
  File "/usr/lib/python2.6/dist-packages/enthought/chaco/axis.py", line 204, in overlay
    self._draw_component(gc, view_bounds, mode, component)
  File "/usr/lib/python2.6/dist-packages/enthought/chaco/axis.py", line 241, in _draw_component
    self._draw_axis_line(gc, self._origin_point, self._end_axis_point)
  File "/usr/lib/python2.6/dist-packages/enthought/chaco/axis.py", line 291, in _draw_axis_line
    gc.move_to(*around(startpoint))
  File "/usr/lib/python2.6/dist-packages/enthought/kiva/agg/agg.py", line 864, in move_to
    def move_to(*args): return _agg.GraphicsContextArray_move_to(*args)
TypeError: in method 'GraphicsContextArray_move_to', argument 2 of type 'double'

According to some other bug reports I found, this is due to a bug in
code generated by swig, and some confusion between C 'float' and
'double' types.  It shows up when python-enable is built under
python2.6.

Here is the upstream bug report:

https://svn.enthought.com/enthought/ticket/1776

That report suggests a work-around by editing /usr/lib/python2.6/dist-
packages/enthought/kiva/agg/agg.py which appears to work correctly for
me.

** Affects: python-enable (Ubuntu)
     Importance: Undecided
         Status: New

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type mismatch causes chaco examples to fail
https://bugs.launchpad.net/bugs/425957
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