matplotlib scatter plot using relative coordinate?

Question

I notice that there is an option of figure fraction etc for annotating text. Is there an option for scatter? I have data points generated by a program that are in figure fraction scale. They will be overplotted onto an image with sky coordinate. The transformation from pixel scale to sky coordinate will be a bit complicated.

Yann · Accepted Answer · 2011-12-15 03:59:18Z

4

Checkout the transform tutorial. You want to first transform from figure units to display units using fig.transFigure, then do the inverse transform to data units, using ax.transData.inverted(). You can make a single transform using transform pipeline:

FigToData = ax.transData.inverted() + fig.transFigure

This can then be used to get values in data units by implementing the transform() method:

xData, yData = FigToData.transform(.1, .1)

Read the tutorial for more detail.

answered Dec 15, 2011 at 3:59

Yann

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