Jan 20, 2015 · Jan 20, 2015
diff --git a/lib/matplotlib/collections.py b/lib/matplotlib/collections.py
    _transOffset = transforms.IdentityTransform()
    _transforms = []



    def __init__(self,
                 edgecolors=None,
                 facecolors=None,
        self._transforms[:, 1, 0] = widths * sin_angle
        self._transforms[:, 1, 1] = heights * cos_angle
        self._transforms[:, 2, 2] = 1.0


        _affine = transforms.Affine2D
        if self._units == 'xy':
            m = ax.transData.get_affine().get_matrix().copy()

        self._bbox = transforms.Bbox.unit()
        self._bbox.update_from_data_xy(coordinates.reshape(
            ((meshWidth + 1) * (meshHeight + 1), 2)))
            ((meshWidth + 1) * (meshHeight + 1), 2)),
            ignore=True)

        # By converting to floats now, we can avoid that on every draw.
        self._coordinates = self._coordinates.reshape(
        self._paths = self.convert_mesh_to_paths(
            self._meshWidth, self._meshHeight, self._coordinates)

    def get_window_extent(self, renderer):
        # get a dummy bounding box
        bbox = transforms.Bbox([[0, 0], [0, 0]])
        # get the data and offset transforms
        trans_data_to_xy = self.get_transform().transform
        transOffset = self.get_offset_transform().transform
        # convert the transforms to data-units
        offsets = transOffset(self._offsets)

        # deal with masked arrays
        coordinates = self._coordinates
        if ma.isMaskedArray(coordinates):
            c = coordinates.data
        else:
            c = coordinates
        # slice sets to pick out the corners of each patch
        # bottom-left, top-left, top-right, bottom-right
        slice_sets = ((slice(0, -1), slice(0, -1)),
                      (slice(0, -1), slice(1, None)),
                      (slice(1, None), slice(1, None)),
                      (slice(1, None), slice(0, -1))
                      )
        # first time ignore the existing bounds
        ignore = True
        for x_slc, y_slc in slice_sets:
            bbox.update_from_data_xy(
                trans_data_to_xy(c[x_slc, y_slc].reshape(-1, 2) + offsets),
                ignore=ignore)
            # but on subsequent loops don't shrink the bounding box
            ignore = False
        return bbox

    @staticmethod
    def convert_mesh_to_paths(meshWidth, meshHeight, coordinates):
        """
Original file line number	Diff line number	Diff line change
Expand Up		@@ -82,8 +82,6 @@ class Collection(artist.Artist, cm.ScalarMappable):
		_transOffset = transforms.IdentityTransform()
		_transforms = []



		def __init__(self,
		edgecolors=None,
		facecolors=None,
Expand DownExpand Up		@@ -1501,7 +1499,7 @@ def _set_transforms(self):
		self._transforms[:, 1, 0] = widths * sin_angle
		self._transforms[:, 1, 1] = heights * cos_angle
		self._transforms[:, 2, 2] = 1.0


		_affine = transforms.Affine2D
		if self._units == 'xy':
		m = ax.transData.get_affine().get_matrix().copy()
Expand DownExpand Up		@@ -1689,7 +1687,8 @@ def __init__(self, meshWidth, meshHeight, coordinates,

		self._bbox = transforms.Bbox.unit()
		self._bbox.update_from_data_xy(coordinates.reshape(
		((meshWidth + 1) * (meshHeight + 1), 2)))
		((meshWidth + 1) * (meshHeight + 1), 2)),
		ignore=True)

		# By converting to floats now, we can avoid that on every draw.
		self._coordinates = self._coordinates.reshape(
Expand All		@@ -1705,6 +1704,38 @@ def set_paths(self):
		self._paths = self.convert_mesh_to_paths(
		self._meshWidth, self._meshHeight, self._coordinates)

		def get_window_extent(self, renderer):
		# get a dummy bounding box
		bbox = transforms.Bbox([[0, 0], [0, 0]])
		# get the data and offset transforms
		trans_data_to_xy = self.get_transform().transform
		transOffset = self.get_offset_transform().transform
		# convert the transforms to data-units
		offsets = transOffset(self._offsets)

		# deal with masked arrays
		coordinates = self._coordinates
		if ma.isMaskedArray(coordinates):
		c = coordinates.data
		else:
		c = coordinates
		# slice sets to pick out the corners of each patch
		# bottom-left, top-left, top-right, bottom-right
		slice_sets = ((slice(0, -1), slice(0, -1)),
		(slice(0, -1), slice(1, None)),
		(slice(1, None), slice(1, None)),
		(slice(1, None), slice(0, -1))
		)
		# first time ignore the existing bounds
		ignore = True
		for x_slc, y_slc in slice_sets:
		bbox.update_from_data_xy(
		trans_data_to_xy(c[x_slc, y_slc].reshape(-1, 2) + offsets),
		ignore=ignore)
		# but on subsequent loops don't shrink the bounding box
		ignore = False
		return bbox

		@staticmethod
		def convert_mesh_to_paths(meshWidth, meshHeight, coordinates):
		"""
Expand Down