2009/9/1 John Hunter <jdh2358@...149...>:
. I'm trying to add text but the canvas origin is at the top left,
how can I transform the co-ordinates from the matplotlib to canvas?
def draw_text(self, gc, x, y, s, prop, angle, ismath=False):
ctx = self.ctx
ctx.font = "12px Times New Roman";
ctx.fillStyle = "Black";
ctx.fillText("%r" % s, x, y)
The backend canvas should know its height, so height-y should
transform from bottom to top
Thanks, turns out to be a problem setting the size of the canvas
then the text.py takes care of subtracting y from the height.
Next problem is the text alignment, look OK on the right axis but
wrong on the left I presume it's the alignment.
The documentation says that s should be a matplotlib.text.Text
instance and I can use s.get_horizontalalignment() but it seems that s
is a unicode string. How can I find the alignment I should set on the
My understanding is that all the backends should use left-bottom
alignment. Text alignment in matplotlib is handled by mpl itself (not
by the backend), and for this to work, you have to define
get_text_width_height_descent method correctly.
The real question is how we know the metric of the font that will be
used for rendering. I have little knowledge about the html canvas
specification, but I presume that the situation is very similar to the
svg case. Unless we embed the fonts (the svg backend has an option to
embed the fonts as paths), I don't think it is possible to get it
Again, I have little knowledge about html5 canvas thing, and I hope
any expert out ther clarify this issue.
ps. gnuplot seems to use embedded fonts for their html5 canvas backend
(I haven't checked carefully but their demo output uses canvastext.js,
originally from http://jim.studt.net/canvastext/)
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