"Bill Baxter" <[EMAIL PROTECTED]> writes:
> I want to draw some labels with plot.text() and have them appear a
> given number of pixels (or mm, or points) to above and to the right of
> the data points they are describing. Is there some way to specify a
> screen offset from a point in graph coordinates?
Here's what I came up with. Perhaps the matplotlib gurus know a
simpler way... (One way to simplify this would be to add a new
"offset" Func in _transforms.cxx, so the user could just copy the
transData transform and call set_funcx and set_funcy with suitable
offset functions.)
#!/usr/bin/env python
import matplotlib
from matplotlib.transforms import Value, zero, Affine, Point
from pylab import figure, show
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,'.')
offset = Point(Value(10), Value(5))
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())
trans = Affine(scale_x, zero(), zero(), scale_y,
ll2.x()-scale_x*ll1.x() + offset.x(),
ll2.y()-scale_y*ll1.y() + offset.y())
for a,b in zip(x,y):
ax.text(a, b, '(%d,%d)'%(a,b), transform=trans)
show()
If you run this and then pan and zoom, the offsets of the text labels
should stay constant.
--
Jouni
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