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[XForms] Colour picker

From: jon
Subject: [XForms] Colour picker
Date: Wed, 25 Nov 2020 14:13:07 +0000
User-agent: Evolution 3.36.4-0ubuntu1

I see lots of demos in xforms but I can't find anything I can use as a
colour picker.

I've created a form and loaded up a graphic with:

    obj = fl_add_pixmap( FL_NORMAL_PIXMAP, 50, 40, 450, 450, "" );
    fl_set_pixmap_file( obj, "conic-spectrum1.xpm" );

But I am not sure how I can read an RGB value from under the cursor. I
need the raw RGB value not the closest forms colour.

Some combination of XGetPixel and the mouse position might do the job
but I am unsure how to combine Xlib stuff with Xforms objects in any
useful way.

Does anyone have an example that might help.


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