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Add a convenience method to rotate a patch #1156

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Add a convenience method to rotate a patch #1156

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762046b
Add a convenience method to rotate a patch
dmcdougall Aug 28, 2012
9bee09b
Fix typo in docstring
dmcdougall Aug 28, 2012
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37 changes: 36 additions & 1 deletion lib/matplotlib/mlab.py
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Original file line number Diff line number Diff line change
Expand Up @@ -152,7 +152,7 @@
import matplotlib.cbook as cbook
from matplotlib import docstring
from matplotlib.path import Path

from matplotlib.transforms import Affine2D

def logspace(xmin,xmax,N):
return np.exp(np.linspace(np.log(xmin), np.log(xmax), N))
Expand Down Expand Up @@ -3195,6 +3195,41 @@ def quad2cubic(q0x, q0y, q1x, q1y, q2x, q2y):
# c3x, c3y = q2x, q2y
return q0x, q0y, c1x, c1y, c2x, c2y, q2x, q2y

def rotate_patch(p, ax, theta, pivot=None):
"""
Rotates a simple closed polygon *p* of type :class:`Patch` *theta* radians
about the point *pivot*. If pivot is *None* then rotate about the
polygon's centre of mass.

The argument *ax* is the :class:`Axes` object to which *p* will be added.
"""
verts = p.get_verts()

if pivot is None:
area = 0
cx = 0
cy = 0
for i in range(len(verts) - 1):
factor = verts[i,0] * verts[i+1,1] - verts[i+1,0] * verts[i,1]
area += factor
cx += factor * (verts[i,0] + verts[i+1,0])
cy += factor * (verts[i,1] + verts[i+1,1])

# Do last and first vertex
factor = verts[-1,0] * verts[0,1] - verts[0,0] * verts[-1,1]
area += factor
cx += factor * (verts[-1,0] + verts[0,0])
cy += factor * (verts[-1,1] + verts[0,1])

area /= 2.0
cx /= 6.0 * area
cy /= 6.0 * area
else:
cx = pivot[0]
cy = pivot[1]
t = Affine2D().rotate_around(cx, cy, theta) + ax.transData
p.set_transform(t)

def offset_line(y, yerr):
"""
Offsets an array *y* by +/- an error and returns a tuple (y - err, y + err).
Expand Down
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