[[!meta  title="Image click locations"]]

The [[clickloc.tk]] micro-app just opens an image file and prints out
the pixel coordinates of any mouse clicks upon it. I use it to get
rough numbers from journal figures. You can use [[scale_click.py]] to
convert the output to units of your choice, if you use your first four
clicks to mark out the coordinate system (xmin,anything),
(xmax,anything), (anything,ymin), and (anything,ymax).

    $ pdfimages article.pdf fig
    $ clickloc.tk fig-000.ppm > fig-000.pixels
    $ scale_click.py 0 10 5 20 fig-000.pixels > fig-000.data

Take a look at [[plotpick]] for grabbing points from raw datafiles
(which is more accurate and easier than reverse engineering images).

[[!tag tags/bash]]
[[!tag tags/code]]
[[!tag tags/linux]]
[[!tag tags/programming]]
[[!tag tags/tcl-tk]]
[[!tag tags/theory]]