def locate_label(self, linecontour, labelwidth):
"""find a good place to plot a label (relatively flat
part of the contour) and the angle of rotation for the
text object
"""
nsize = len(linecontour)
if labelwidth > 1:
xsize = int(ceil(nsize / labelwidth))
else:
xsize = 1
if xsize == 1:
ysize = nsize
else:
ysize = labelwidth
XX = resize(asarray(linecontour)[:, 0], (xsize, ysize))
YY = resize(asarray(linecontour)[:, 1], (xsize, ysize))
yfirst = YY[:, 0]
ylast = YY[:, -1]
xfirst = XX[:, 0]
xlast = XX[:, -1]
s = ((reshape(yfirst, (xsize, 1)) - YY) *
(reshape(xlast, (xsize, 1)) - reshape(xfirst, (xsize, 1))) -
(reshape(xfirst, (xsize, 1)) - XX) *
(reshape(ylast, (xsize, 1)) - reshape(yfirst, (xsize, 1))))
L = sqrt((xlast - xfirst)**2 + (ylast - yfirst)**2)
dist = add.reduce(([(abs(s)[i] / L[i]) for i in range(xsize)]), -1)
x, y, ind = self.get_label_coords(dist, XX, YY, ysize, labelwidth)
#print 'ind, x, y', ind, x, y
angle = arctan2(ylast - yfirst, xlast - xfirst)
rotation = angle[ind] * 180 / pi
if rotation > 90:
rotation = rotation - 180
if rotation < -90:
rotation = 180 + rotation
# There must be a more efficient way...
lc = [tuple(l) for l in linecontour]
dind = lc.index((x, y))
#print 'dind', dind
#dind = list(linecontour).index((x,y))
return x, y, rotation, dind
def locate_label(self, linecontour, labelwidth):
"""find a good place to plot a label (relatively flat
part of the contour) and the angle of rotation for the
text object
"""
nsize= len(linecontour)
if labelwidth > 1:
xsize = int(ceil(nsize/labelwidth))
else:
xsize = 1
if xsize == 1:
ysize = nsize
else:
ysize = labelwidth
XX = resize(asarray(linecontour)[:,0],(xsize, ysize))
YY = resize(asarray(linecontour)[:,1],(xsize,ysize))
yfirst = YY[:,0]
ylast = YY[:,-1]
xfirst = XX[:,0]
xlast = XX[:,-1]
s = ( (reshape(yfirst, (xsize,1))-YY) *
(reshape(xlast,(xsize,1)) - reshape(xfirst,(xsize,1)))
- (reshape(xfirst,(xsize,1))-XX)
* (reshape(ylast,(xsize,1)) - reshape(yfirst,(xsize,1))) )
L=sqrt((xlast-xfirst)**2+(ylast-yfirst)**2)
dist = add.reduce(([(abs(s)[i]/L[i]) for i in range(xsize)]),-1)
x,y,ind = self.get_label_coords(dist, XX, YY, ysize, labelwidth)
#print 'ind, x, y', ind, x, y
angle = arctan2(ylast - yfirst, xlast - xfirst)
rotation = angle[ind]*180/pi
if rotation > 90:
rotation = rotation -180
if rotation < -90:
rotation = 180 + rotation
# There must be a more efficient way...
lc = [tuple(l) for l in linecontour]
dind = lc.index((x,y))
#print 'dind', dind
#dind = list(linecontour).index((x,y))
return x,y, rotation, dind