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# Copyright (c) 2008-2013 by Enthought, Inc.
# All rights reserved.
from mock import Mock
from kiva.image import GraphicsContext
class KivaTestAssistant(object):
""" Mixin test helper for kiva drawing tests.
"""
def create_mock_gc(
self, width, height, methods=()):
""" Create an image graphics context that with mocked methods.
Parameters
----------
width, height :
The size of the graphics context canvas.
methods : iterable
the methods which are going to be mocked with a Mock object.
"""
gc = GraphicsContext((int(width), int(height)))
gc.clear((0.0, 0.0, 0.0, 0.0))
for method in methods:
setattr(gc, method, Mock())
return gc
def assertPathsAreProcessed(self, drawable, width=200, height=200):
""" Check that all the paths have been compiled and processed.
Parameters
----------
drawable :
A drawable object that has a draw method.
width : int, optional
The width of the array buffer (default is 200).
height : int, optional
The height of the array buffer (default is 200).
note ::
A drawable that draws nothing will pass this check.
"""
gc = GraphicsContext((width, height))
drawable.draw(gc)
compiled_path = gc._get_path()
total_vertices = compiled_path.total_vertices()
self.assertEqual(
total_vertices, 0,
msg='There are {0} vertices in compiled paths {1} that '
'have not been processed'.format(total_vertices, compiled_path))
def assertPathsAreCreated(self, drawable, width=200, height=200):
""" Check that drawing creates paths.
When paths and lines creation methods are used from a graphics
context the drawing paths are compiled and processed. By using
a mock graphics context we can check if something has been drawn.
Parameters
----------
drawable :
A drawable object that has a draw method.
width : int, optional
The width of the array buffer (default is 200).
height : int, optional
The height of the array buffer (default is 200).
"""
gc = self.create_mock_gc(width, height, ('draw_path', 'stroke_path'))
drawable.draw(gc)
compiled_path = gc._get_path()
self.assertTrue(
compiled_path.total_vertices() > 0,
msg='There are no compiled paths '
'created: {0}'.format(compiled_path))
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