Replying to myself...
Erik Cederstrand wrote:
> Hi!
>
> I'm trying to make a clickable plot_date() plot (using the Pylons
> framework). What I need is the pixel coordinates of the data points I
> give to plot_date(), but the trans.seq_x_y() function doesn't like
> Datetime:
>
> >> xcoords, ycoords = trans.seq_x_y(x, y)
> float() argument must be a string or a number
>
> How can I get the pixel coordinates?
>
> Here are the relevant parts of my code (x is Datetime, y is float):
>
> figure = pylab.figure(figsize=(6,4), dpi=100, frameon=False)
> ax = figure.add_subplot(111)
>
> # quick simple scatter plot
> ax.plot_date(x, y, 'ro')
>
> # Convert the data set points into screen space coordinates
> trans = ax.get_transform()
> xcoords, ycoords = trans.seq_x_y(x, y)
Thanks to the excellent documentation, I solved this by using
dates.date2num():
xcoords, ycoords = trans.seq_x_y(dates2num(x), y)
Erik
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