/usr/lib64/python2.6/site-packages/mpl_toolkits/axes_grid
Edit: /usr/lib64/python2.6/site-packages/mpl_toolkits/axes_grid/clip_path.py (3506B)
import numpy as np
from math import degrees
import math
def atan2(dy, dx):
if dx == 0 and dx == 0:
print "warning"
return 0
else:
return math.atan2(dy, dx)
# FIXME : The current algorithm seems to return incorrect angle when the line
# ends at the boudnary.
def clip(xlines, ylines, x0, clip="right"):
clipped_xlines = []
clipped_ylines = []
_pos_angles = []
for x, y in zip(xlines, ylines):
if clip in ["up", "right"]:
b = (x < x0).astype("i")
db = b[1:] - b[:-1]
else:
b = (x > x0).astype("i")
db = b[1:] - b[:-1]
if b[0]:
ns = 0
else:
ns = -1
segx, segy = [], []
for (i,) in np.argwhere(db!=0):
c = db[i]
if c == -1:
dx = (x0 - x[i])
dy = (y[i+1] - y[i]) * (dx/ (x[i+1] - x[i]))
y0 = y[i] + dy
clipped_xlines.append(np.concatenate([segx, x[ns:i+1], [x0]]))
clipped_ylines.append(np.concatenate([segy, y[ns:i+1], [y0]]))
ns = -1
segx, segy = [], []
if dx == 0. and dy == 0:
dx = x[i+1] - x[i]
dy = y[i+1] - y[i]
a = degrees(atan2(dy, dx))
_pos_angles.append((x0, y0, a))
elif c == 1:
dx = (x0 - x[i])
dy = (y[i+1] - y[i]) * (dx / (x[i+1] - x[i]))
y0 = y[i] + dy
segx, segy = [x0], [y0]
ns = i+1
if dx == 0. and dy == 0:
dx = x[i+1] - x[i]
dy = y[i+1] - y[i]
a = degrees(atan2(dy, dx))
_pos_angles.append((x0, y0, a))
#print x[i], x[i+1]
if ns != -1:
clipped_xlines.append(np.concatenate([segx, x[ns:]]))
clipped_ylines.append(np.concatenate([segy, y[ns:]]))
#clipped_pos_angles.append(_pos_angles)
return clipped_xlines, clipped_ylines, _pos_angles
def clip_line_to_rect(xline, yline, bbox):
x0, y0, x1, y1 = bbox.extents
lx1, ly1, c_right_ = clip([xline], [yline], x1, clip="right")
lx2, ly2, c_left_ = clip(lx1, ly1, x0, clip="left")
ly3, lx3, c_top_ = clip(ly2, lx2, y1, clip="right")
ly4, lx4, c_bottom_ = clip(ly3, lx3, y0, clip="left")
c_left = [((x, y), (a+90)%180-180) for (x, y, a) in c_left_ \
if bbox.containsy(y)]
c_bottom = [((x, y), (90 - a)%180-90) for (y, x, a) in c_bottom_ \
if bbox.containsx(x)]
c_right = [((x, y), (a+90)%180) for (x, y, a) in c_right_ \
if bbox.containsy(y)]
c_top = [((x, y), (90 - a)%180+90) for (y, x, a) in c_top_ \
if bbox.containsx(x)]
return zip(lx4, ly4), [c_left, c_bottom, c_right, c_top]
if __name__ == "__main__":
import matplotlib.pyplot as plt
x = np.array([-3, -2, -1, 0., 1, 2, 3, 2, 1, 0, -1, -2, -3, 5])
#x = np.array([-3, -2, -1, 0., 1, 2, 3])
y = np.arange(len(x))
#x0 = 2
plt.plot(x, y, lw=1)
from matplotlib.transforms import Bbox
bb = Bbox.from_extents(-2, 3, 2, 12.5)
lxy, ticks = clip_line_to_rect(x, y, bb)
for xx, yy in lxy:
plt.plot(xx, yy, lw=1, color="g")
ccc = iter(["ro", "go", "rx", "bx"])
for ttt in ticks:
cc = ccc.next()
for (xx, yy), aa in ttt:
plt.plot([xx], [yy], cc)
#xlim(