Michael Droettboom wrote:
I just added a test of intersects_bbox to SVN that seems to be working
correctly for short paths containing masked values. It would appear
that masked values *should* be dealt with correctly (that is, in exactly
the same way as they are drawn) by the intersection code. However,
there is probably a side case here that I'm missing. As Eric suggests,
see if you can break it down into a simple example that fails and
hopefully the problem and/or solution will be more obvious from that.
Mike,
I was wrong; it has nothing to do with masked values. It is much
simpler: it appears that for the purpose of this test, the path is being
treated as if it were closed. See attached. I think this accounts for
Evan's mis-identified tracks.
Eric
from pylab import *
import numpy as np
from matplotlib.transforms import Bbox
from matplotlib.path import Path
from matplotlib.patches import Rectangle
rect = Rectangle((-1, -1), 2, 2, facecolor="#aaaaaa")
gca().add_patch(rect)
bbox = Bbox.from_bounds(-1, -1, 2, 2)
vertices = np.array([(-2, -2), (2, -2), (2, 2), (-2, 2)])
path = Path(vertices)
if path.intersects_bbox(bbox):
color = 'r'
else:
color = 'b'
plot(vertices[:,0], vertices[:,1], color=color)
axis([-3, 3, -3, 3])
show()
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