[Gimp-developer] Improvement for measurement tool

[Alec Burgess]

Chris Mohler (cr33dog at gmail.com) wrote (in part)  (on 2009-07-05 at
16:11):
>  What the heck - I added it as a (very) simple plug-in:
>  http://registry.gimp.org/node/17235 In 2.6. it returns the length of
>  the path on the status bar. I used gimp_message, so IIRC the location
>  of the message is configurable. It silently fails if there is no
>  active path - it seems to work OK with multiple paths, straight
>  lines, and curves. There is no need to stroke the path. You will need
>  to have Python installed though...

Works on Windows 2.6.6 but message is displayed in Error console (which 
I have as one of panels in main dock) not on the status bar. Is this 
somehow configurable?

Note: IMO this is a feature not a bug since it allows user to change the 
path and re-measure leaving a "history" record in the Error console.

Unlike some "error" messages posted to Error console it does not 
auto-raise the error console if the panel it is in is displaying 
something else.

Note: I tested by using Supernova filter on a white background, 
selecting white, inverting and then Select to Path and named it Path_A.
Response to Measure-Path in Error console was: Path Warning Length of 
Path_A: 3474 px. That would have taken an extremely long time to 
calculate with the measure tool :-)

Whether paths are Active or not does not appear to change results - it 
still shows the measurement.

I created a second much simpler path with Free-Select-Tool then 
converted to path and named it "Path_B". With the two paths it showed: 
Length of Path_B: 383 px.

It appears (based on swapping order of paths with drag+drop) that it 
always shows the length of the lowest path (the one a the bottom of the 
list)

Bug?: The entry "Filters - Measurement - Path" is always enabled whether 
or not any path exists (expected) but in Filters-Repeat "Path",  
Filters-Reshow "Path" and Filters-Recently Used-Path it always shows as 
Disabled (grayed out).
Is this an easy fix?

For reference in case someone other than Chris knows the answer, text of 
the python plugin follows:

    #!/usr/bin/env python
    # Author: Chris Mohler
    # Copyright 2009 Chris Mohler
    # License: GPL v3
    # GIMP plugin to measure the length of a path

    from gimpfu import *

    gettext.install("gimp20-python", gimp.locale_directory, unicode=True)


    def measure_path(img, drw):
        try:
        path = pdb.gimp_image_get_active_vectors(img)
        len = pdb.gimp_vectors_stroke_get_length(path, 1, 1)
        len = int(len)
        pdb.gimp_message("Length of " + path.name + ": " + str(len) + " px")
        except:
        pass
       
    register(
        "python-fu-measure-path",
        "Measure Path",
        "Measure Length of the Active Path",
        "Chris Mohler",
        "Chris Mohler",
        "2009",
        "<Image>/Filters/Measure/Path",
        "",
        [],
        [],
        measure_path,
        domain=("gimp20-python", gimp.locale_directory)
        )

    main()


-- 
Regards ... Alec   (buralex at gmail & WinLiveMess - alec.m.burgess at skype)


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