Hey that's great. Thanks Jouni. There may be a better way, but this
is at least a lot easier to figure out than the code in QuiverKey!
You can even throw all the magic into one function like this:
def const_offset(x,y):
ax = gca()
ll1 = ax.transData.get_bbox1().ll()
ur1 = ax.transData.get_bbox1().ur()
ll2 = ax.transData.get_bbox2().ll()
ur2 = ax.transData.get_bbox2().ur()
scale_x = (ur2.x()-ll2.x())/(ur1.x()-ll1.x())
scale_y = (ur2.y()-ll2.y())/(ur1.y()-ll1.y())
offset = Point(Value(x), Value(y))
trans = Affine(scale_x, zero(), zero(), scale_y,
ll2.x()-scale_x*ll1.x() + offset.x(),
ll2.y()-scale_y*ll1.y() + offset.y())
return trans
And then just add a transform=const_offset(x,y) parameter wherever
you want one.
Great. And it works for things besides text too.
--------------------
#!/usr/bin/env python
import matplotlib
from matplotlib.transforms import Value, zero, Affine, Point
from pylab import figure, show, gca
def const_offset(x,y):
ax = gca()
ll1 = ax.transData.get_bbox1().ll()
ur1 = ax.transData.get_bbox1().ur()
ll2 = ax.transData.get_bbox2().ll()
ur2 = ax.transData.get_bbox2().ur()
scale_x = (ur2.x()-ll2.x())/(ur1.x()-ll1.x())
scale_y = (ur2.y()-ll2.y())/(ur1.y()-ll1.y())
offset = Point(Value(x), Value(y))
trans = Affine(scale_x, zero(), zero(), scale_y,
ll2.x()-scale_x*ll1.x() + offset.x(),
ll2.y()-scale_y*ll1.y() + offset.y())
return trans
x = (3,1,4,1,5,9,2,6,5,3,5,8,9,7,9,3)
y = (2,7,1,8,2,8,1,8,2,8,4,5,9,0,4,5)
fig=figure()
ax=fig.add_subplot(111)
ax.plot(x,y,'.')
for a,b in zip(x,y):
ax.text(a, b, '(%d,%d)'%(a,b), transform=const_offset(20,0))
ax.plot(x,y, 'gv',transform=const_offset(0,-10))
ax.plot(x,y, 'm^',transform=const_offset(0, 10))
show()
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